DARRELL VELEGOL - Velegol.org

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1
-
19

Darrell Velegol

Department of Chemical Engineering

Penn State University
,
University Park PA 16802, USA

Phone: (814) 865
-
8739, email
velegol@psu.edu
, web
www.velegol.org



Professional Preparation

West Virginia University

BS Chemical Engineering

1988
-
1992

University of Melbourne (Australia)

NSF PhD enhancement (Maths)

1996

Carnegie Mellon University

PhD Chemical Engineering

1993
-
1997

Carnegie Mellon University

post
-
doc (Micr
oscopy & Cell Bio)

1997
-
1999


Appointments

Distinguished Professor

Penn State University

2012
-
present

Professor

Penn State University

2009
-
present

Associate Professor

Penn State University

2005
-
2009

Assistant Professor

Penn State University

1999
-
2005

Summe
r Design Intern

The Chester Engineers

1989


Selected Publications


1.

Jerri, Huda A.; Adolfsen, Kristin J.;

McCullough, Lauren R.; Velegol, Darrell; Velegol,
Stephanie B. “Anti
-
microbial sand via adsorption of cationic Moringa oleifera protein,”
Langmuir
,
28
,

2262
-
2268 (2012).

2.

Chaturvedi, Neetu; Hsiao, Erik; Velegol, Darrell; Kim, Seong H. “Mask
-
less fabrication of
nanowells using chemically reactive colloids.”
Nano Letters
,
11
, 672
-
676 (2011).

Corrigenda
Nano Letters
,
11
, 3511 (2011).

3.

González Serrano
,
César; McDermott, Joseph J.
;
Velegol
,
Darrell
.

Sediments of Soft
Spheres Arranged by Effective Density.”
Nature Materials
,
10
, 716
-
721 (2011).

4.

Chaturvedi, Neetu; Hong, Yiying; Sen, Ayusman; Velegol, Darrell, “Magnetic Enhancement
of Phototaxing Catalytic

Motors,”
Langmuir
,
26
, 6308
-
6313 (2010).

5.

Hong, Yiying; Velegol, Darrell; Chaturvedi, Neetu; Sen, Ayusman. “Biomimetic behavior of
synthetic particles: from microscopic randomness to macroscopic control.”
Physical
Chemistry Chemical Physics
,
12
, 1423
-
1435

(2010). Invited Perspective article.


6.

Velegol, Darrell; Jerri, Huda A.; McDermott, Joseph J.; Chaturvedi, Neetu. “Micro
-
factories
for Colloidal Assemblies,”
AIChE Journal
,
56
, 564
-
569 (2010)
.

This is an invited
Perspective article.

7.

Nel, Andre E.; Mädler
, Lutz; Velegol, Darrell; Xia, Tian;
Hoek, Eric M.; Somasundaran,
Ponisseril; Klaessig, Fred; Castranova, Vince; Thompson, Mike. “Bio
-
physicochemical
interactions at the nano
-
bio interface: implications for biological use and safety assessment of
engineere
d nanoparticles.”
Nature Materials
,
8
, 543
-
557 123 (2009).

8.

Hong, Yiying; Blackman, Nicole M.K.; Kopp, Nathaniel D.; Velegol, Darrell; Sen,
Ayusman. “Chemotaxis of Non
-
Biological Nanorods.”
Physical Review Letters
,
99
, 178103
(p 1
-
4) (2007). See Highlight
in
Nature
,
450
, 5 (2007).

9.

Kim, Hye
-
Young; Sofo, Jorge O.; Velegol, Darrell; Cole, Milton W.; Lucas, Amand A. “Van
der Waals forces between dielectric nanoclusters.”
Langmuir
,
23
, 1735
-
1740 (2007).

10.

Velegol, Darrell.
Wild Scholars: Designing a learning
system for educating Scholars toward
their passions and purposes
. (2011, available on Amazon).



2
-
19

Honors & Awards

Fellow of the American Association for the Advancement of Science (AAAS), 2011

Schreyer Honors College
Inaugural
Distinguished Honors Faculty P
rofessor, 2010

Penn State Engineering Alumni Society Outstanding Teaching Award, 2010

Alpha Chi Sigma Outstanding Professor Award, Penn State University, 2003, 2009

Victor K. LaMer Award, American Chemical Society Colloids & Surfaces Division, June 1998

Na
tional Science Foundation PhD Fellow, August 1992
-

July 1995

DuPont PhD Fellow, August 1992
-

July 1996

Rhodes Scholar Finalist (District II), December 1991

Truman Scholar Alternate, March 1990

West Virginia University Foundation Scholar, August 1988
-

Ma
y 1992


Professional Affiliations

American Association for the Advancement of Science (AAAS), 1994


present
, now Fellow

American Chemical Society (ACS), 1994


present

American Institute of Chemical Engineers (AIChE), 1989


present

American Society for
Engineering Education (ASEE), 1999


present


Synergistic Activities



Undergraduate research
. Have mentored 5
5

undergrad students in my research lab
(including
30

NSF summer REU students), on colloidal assembly, bacterial adhesion,
nanocolloid forces, Mori
nga oleifera.



Symposium organizer and session chair
. Have organized 4

symposia at National ACS
meetings. Have chaired more than 20 sessions at annual ACS, AIChE, and
other

national
meetings.

Chair elected of
Gordon Conference in 2014 (
Colloidal, Macromo
lecular &
Polyelectrolyte Solutions
).



Journal and proposal reviewer
. Journals include
Nano Letters
,
Proceedings of the National
Academy of Science USA
,
Langmuir
,
Journal of Colloid and Interface Science
,
Industrial &
Engineering Chemistry Research
,
Journal

of Nanoscience and Nanotechnolog
y, Physical
Review Letters
,
Physical Review E
,
ASME Journal of Biomechanical Engineering
,
Journal of
Chemical Physics, Nature Materials, J Membrane Science
. Funding agencies include the
National Science Foundation (many CAREER, NIRT, NER panels), National Institutes of
Health (NIEHS), Petroleum Research Fund, Department of Energy, Los Alamos National
Lab.

E
ditorial advisory board

for
Langmuir
.



CENTER

works
hop
s
.
These range from 1 hour to multiple days, covering the acronym
CENTER = Character + Excellence + owNership + Tenacity + Entrepreneurship +
Relationship. The workshop consists of particular skills, plus opportunities for participants.



molecular and
colloids courses
. Developed ChE 528 grad course “Colloids and
Nanocolloids”, taught to dozens of students from various departments; co
-
developed
developed Chem 497A “Physical Chemistry” that includes introductory statistical mechanics
and molecular
-
level
migration concepts.


Collaborators

& Other Affiliations

Thesis/post
-
doc advisors
. John L. Anderson (President, Illinois Institute Tech), Stephen Garoff
(Physics, CMU), post
-
doc Frederick Lanni (Biology, CMU)

Outside collaborators (last 5 years)
. Silvina
Gatica (Physics, Howard), Michael J. Pishko
(Chemical Engineering, Texas

A&M), Amand Lucas (Belgium).

3
-
1
9

Current

graduate students (
6 at
Penn State ChE)
.
Laura Ramirez (PhD
Summer

2012), Tso
-
Yi
Chiang (PhD
Spring

201
3
)
,

Abhishek Kar (PhD Spring 2015),
Sruti
Balasubramanian

(PhD
Spring 2016),
Anwesha Basu

(PhD Spring 2016).

Current post
-
docs

and research associates
.
Dr.
Tim Kline

(Research Associate).

Previous graduate students

(12).

Jason D. Feick (PhD 2002, post
-
doc 2003, E Ink), Aron Parekh
(PhD 2003, Vanderbilt University Medical School),
Michael Salerno (PhD 2005, Camp, Dresser,
& McKee), Gretchen L. Holtzer (PhD 2005, ExxonMobil), Joseph F. Jones (PhD 2005, Center
for Naval Ana
lysis), Mary L. Parent (PhD 2007, Lexmark), Allison Yake (PhD 2007, DuPont),
Charles E. Snyder (PhD 2008, Institute for Defense Analysis), Prasanna K. Thwar (MS 2001,
PhD Michigan,
Advanced Liquid Logic
), Martin Gentile (MS 2004, Pfizer), Nicole Blackman
(
MS 2007, Corning), Shailesh Sh
ori (MS 2008, U South Carolina), Huda A. Jerri (F
irmenich
),
César González Serrano

(MS 2010, Sabic),

Neet
u Chaturvedi (PhD 2011, DuPont), Joseph M.
McDermott (PhD 2011, Harvard University).

Previous p
ost
-
docs

(5). Jason D. Fe
ick (Chemical Engineering, 2003, now at E Ink), Aron
Parekh (2004, now at Vanderbilt University Medical School),

Mercedes Calbi (Physics, joint
with Milton Cole 2002, now at U Southern Illinois), Silvina Gatica (Physics, joint with Milton
Cole 2004, Howard

University),
Hye
-
Young Kim (Physics, joint with Milton Cole 2005
-
7,
Assistant Professor of Physics and Chemistry at Southeastern Louisiana University)

Penn State collaborators (last 5 years)
. Milton Cole (Physics), Kristen Fichthorn (Chemical
Engineering), Ayusman Sen (Chemistry),
Tony Huang (Engineering Science & Mechanics),
Thomas Mallouk (Chemistry), Christine Keating (Chemistry), Theresa
Mayer (Electrical
Engineering).


Research: Colloidal
Unit Operations

and Distributive Processing


Our long term vision is to enable “distributive processing”. In the traditional chemical
f
actory


whether it as large as a petroleum refining facility or as small as a microfluidic network


one brings the raw materials
to

the factory, processes them, and then ships the products. For
some systems, such centralized processing is expensive or i
mpossible; this is true in many
geologic formations, oceans, perhaps even forests or soils or fields, or even the human body.
Thus, our work aims to design and fabricate “micro unit operations”, which are micron size,
mobile, colloidal particle assemblies

that can be transported in situ over broad areas and act on
those regions to perform tasks, often collectively.


Our lab group fabricates colloidal
motors and unit ops
, from roughly 100 nanometers to
10 micrometers in size, for technologies in microbots,
localized pumping,
reagent delivery
, and
potable water
. Our “particle lithography” and “salting out / quenching / fusing” techniques are
examples of ways we manipulate forces between the particles, so that the small particles “know
how to
assemble

themsel
ves together”.
Our

research requires fundamental studies in colloidal
forces, electrokinetic
flow
modeling, and instabilities in sedimentation operations. Our lab group
combines experiments (e.g., video microscopy,
electron microscopy,
Nanofabrication,
s
ynthesis), numerics (e.g., Brownian dynamics simulations, eigenmode problems), and theory
(e.g., hydrodynamics, electrokinetics,
colloidal forces
).


A few areas of our particular research ex
pertise includes:


colloidal
assemblies
. By placing site
-
specif
ic chemistry on individual colloidal particles using
our “particle lithography” method, we are working toward building colloidal
micro unit
operations for the distributive processing work
.

colloidal

forces
.
We have examined the role of charge nonuniformit
y on electrostatic forces
between particles, and w
e have developed the “coupled dipole method” to calculate van der
Waals forces between nanocolloids, to improve upon the Lifshitz theory (which is not applicable
4
-
19

for nanocolloids, for several reasons).
Our

knowledge of colloidal forces greatly aids in
fabricating new types of assemblies
.

electrokinetic flows
. We use the hydrodynamic and electrostatic equations, along with the
diffusion and ion migration equations, to predict how particles move in electroph
oresis,
diffusiophoresis, and related phenomena. Of particular interest to us is “self
-
driven
electrokinetic flows”, which arise as the particles themselves dissolve, engage catalytic reactions,
or other chemical transformations. Such self
-
driven flows a
re important in confined geometries.

sorting
. Sedimentation separations by gravity or centrifugation must be done in density
gradients, and even then are subject to a classic Rayleigh
-
Bénard instability.
We have developed
a simpler and more effective the
rmodynamic separation process for colloidal particles
.

Moringa oleifera
.
We are using the seed from the Moringa oleifera tree to produce drinkable
water in developing nations
.

The cationic proteins in the seed both clarify turbidity out of water,
and kil
l pathogens in the water via an antimicrobial peptide.


Darrell Velegol attended West Virginia University for his BS in Chemical Engineering, and he earned his PhD
in Chemical Engineering at Carnegie Mellon University in 1997 working with Professors John L
. Anderson and
Stephen Garoff. In 1998 Velegol won the Victor K. LaMer Award of the American Chemical Society for the
best PhD in the field of Colloid & Surface Science. He continued with a post
-
doc in the Center for Light
Microscope Imaging and Biotechn
ology at Carnegie Mellon, working under Professor Fred Lanni of the
Biology Department. In June 1999 Velegol joined the Department of Chemical Engineering at Penn State,
where he
was promoted to Associate Professor

in 2005
. Velegol won an NSF CAREER
Award in 2000, and

has continued to be funded by NSF, DOE, EPA, PRF, the Air Force, and other agencies for

his work with
colloidal forces,
colloidal assembly
,
electrokinetic flows,
and colloidal motors
.
His research investigates
the
fabrication of colloid
al assemblies and devices, with a
specialty in

understanding the interparticle forces and
sorting

process
es
.
H
is
research
group uses a wide range of experimental

and modeling

approaches.
In 2009
Velegol was promoted to Full Professor at Penn State.
For
his work in experimental and theoretical problems in
the dynamics of complex colloidal particles, Velegol was elected a Fellow of the American Association for the
Advancement of Science in 2011
, and appointed as a Distinguished Professor at Penn State in 2
012
. He
is a
member of ACS, AIChE, AAAS,
and ASEE.

More recently, he has engaged in studying
the

physics of
community
”, pursuing
questions in learning, creativity, motivation, trust and deceit,
courage,
and other social
science ideas using results from
physics, chemistry, biology, and chemical engineering
.
In 2011 he published
a
book,
Wild Scholars
, available through amazon.com, and he
seeks

to

impact
grades 7
-
12 education throughout
Pennsylvania and beyond.



Patents

1

Velegol, Darrell; Feick, Jason D.;

Yake, Allison M.; Snyder, Charles. “Particle
lithography method and ordered structures prepared thereby.”

U.S Patent
No. 7,771,787
(U.S. Patent Application No. 11/211,312), issued 10aug2010. A
pplication
PST
-
14302/36

(
2005
).


Publications

(full list)

1

Velegol, Darrell; Anderson, John L.; Garoff, Stephen. “Probing the Structure of Colloidal
Doublets by Electrophoretic Rotation.”
Langmuir
,
12
, 675
-
685 (1996).

2

Shaeiwitz, Joseph A.; Whiting, Wallace B.; Velegol, Darrell. “A Large
-
Group Senior
Design Experie
nce: Teaching Responsibility and Life
-
Long Learning.”
Chemical
Engineering Education
,
30
, 70
-
75 (1996).

3

Velegol, Darrell; Anderson, John L.; Garoff, Stephen. “Determining the Forces between
Polystyrene Latex Spheres Using Differential Electrophoresis.”
Lan
gmuir
,
12
, 4103
-
4110
(1996).

4

Solomentsev, Yuri; Velegol, Darrell; Anderson, John L. “Conduction in the Small Gap
between Two Spheres.”
Physics of Fluids
,
9
, 1209
-
1217 (1997).

5
-
19

5

Velegol, Darrell; Solomentsev, Yuri; Anderson, John L.; Carnie, Steven L.
“Electr
ophoretic Rotation of Doublets Composed of Two Spheres Almost in Contact.”
Colloids and Surfaces A
,
140
, 59
-
74 (1998).

6

Velegol, Darrell; Catana, Sebastian; Anderson, John L.; Garoff, Stephen. “Tangential
Forces between Non
-
Touching Colloidal Particles.”
Ph
ysical Review Letters
,
83
, 1243
-
1246 (1999).

7

Anderson, John L.; Velegol, Darrell; Garoff, Stephen. “Experimental Studies of the
Forces between Colloidal Particles.”
Langmuir
,
16
, 3372
-
3384 (2000).

8

Velegol, Darrell; Feick, Jason D.; Collins, Lance. “Electro
phoresis of Spherical Particles
with a Random Distribution of Zeta Potential or Surface Charge”,
Journal of Colloid and
Interface Science
,
230
, 114
-
121 (2000).

9

Feick, Jason D.; Velegol, Darrell. “The Electrophoresis of Spheroidal Particles having a
Random

Distribution of Zeta Potential”,
Langmuir
,
16
, 10315
-
10321 (2000).

10

Thwar, Prasanna K.; Velegol, Darrell.
“Measuring Particle Diameter and Particle
-
Particle
Gap with Nanometer Precision Using an Optical Microscope.”
Industrial & Engineering
Chemistry Resea
rch
,
40
, 3042
-
3047 (2001).

11

Velegol, Darrell; Anderson, John L.; Solomentsev, Yuri. “Electrophoresis of Complex
and Interacting Particles”, ch 6
(pp 147
-
172)
in
Interfacial Electrokinetics and
Electrophoresis
, ed. Angel V. Delgado, New York: Marcel Dekker (
2001).

12

Velegol, Darrell; Lanni, Frederick. “Cell Traction Forces on Soft Biomaterials I:
Microrheology of Type I Collagen Gels.”
Biophysical Journal
,
81
, 1786
-
1792 (2001).

13

Velegol, Darrell; Thwar, Prasanna K. “Analytical Model for the Effect of Surface
C
harge Nonuniformity on Colloidal Interactions.”
Langmuir
,
17
, 7687
-
7693 (2001).

14

Feick, Jason D.; Velegol, Darrell. “Measurements of charge nonuniformity on
polystyrene latex particles.”
Langmuir
,
18
, 3454
-
3458 (2002).

15

Velegol, Darrell. “
Electrophoresis of

Randomly
-
Charged Particles
.”
Electrophoresis
,

23
, 2023
-
2028 (2002).

16

Thwar, Prasanna K.; Velegol, Darrell.
“Force Measurements between Weakly
-
attractive
Polystyrene Particles.”
Langmuir
,
18
, 7328
-
7333 (2002
).

17

Velegol, Stephanie B.; Pardi, Shaun; Li, Xu; V
elegol, Darrell; Logan, Bruce E. “AFM
Imaging Artifacts due to Bacterial Cell Height and AFM Tip Geometry.”
Langmuir
,

19
,
851
-
857
(200
3
).

18

Holtzer, Gretchen L.; Velegol, Darrell.

Force Measurements between Colloidal Particles
of Identical Zeta Potentials u
sing Differential Electrophoresis
.


Langmuir

19
,
4090
-
4095

(2003).

19

Calbi, M.M.; Gatica, S.M.; Velegol, D.; Cole, M.W.

Retarded and nonretarded van der
Waals interactions between a cluster and a second cluster or a conducting surface.


Phys.
Rev. A
,
67
,
033201
-
1


033201
-
5
(2003).

20

Velegol, Darrell; Feick, Jason D. “
Evaluating randomness of charge distribution on
colloidal particles using stationary electrophoresis angles
.”
Langmui
r
,
19
, 4592
-
4596
(2003).

21

Jones, Joseph F.; Feick, Jason D.; Imoudu, Daniel;
Chukwumah, Nkiru; Vigeant, Margot;
Velegol, Darrell. “Oriented adhesion of
E. coli

to polystyrene particles.”
Applied &
Environmental Microbiolog
y
,
69
, 6515
-
6519 (2003).

22

Gatica, Silvina M.; Calbi, Mercedes M.;
Cole, Milton W.; Velegol, Darrell.
“Three
-
body
interactions involving clusters and films.”
Physical Review
B
,
68
, 205409
-
1


205409
-
8

(2003).

23

Feick, Jason D.; Velegol, Darrell. “
Reducing Surface Charge Nonuniformity on
Individu
al Particles through Annealing.”
Industrial and Engineering
Research Chemistr
y
,
43
, 3478
-
3483
(2004
).

6
-
19

24

Feick, Jason D.; Chukwumah, Nkiru; Noel,
Alexandra

E.; Velegol, Darrell. “Altering
surface charge nonuniformity on individual colloidal particles.”
Langmuir
,
20
, 3090
-
3095
(2004).

25

Velegol, Darrell. “Brownian sampl
ing in an unbounded space.”
Journal of Colloid and
Interface Science
,
274
, 334
-
336

(2004).

26

Parent, Mary E.; Velegol, Darrell. “
E. coli adhesion to silica in the presence of humic
acid
.”
Colloids and Surfaces B
,
39
, 45
-
51

(2004).

27

Salerno, Michael B.; Logan,

Bruce E.; Velegol, Darrell.

Importance of molecular
details in predicting bacterial adhesion to hydrophobic surfaces
.”
Langmuir
,
20
, 10625
-
10629

(2004).

28

Gatica, Silvina M.; Cole, Milton W.; Velegol, Darrell.
“Designing van der Waals forces
between nanoc
olloids.”
Nano Letters
,
5
, 169
-
173 (2005).

29

Snyder, Charles E.; Yake, Allison M.; Feick, Jason D.; Velegol, Darrell. “Nanoscale
Functionalization and Site
-
Specific Assembly of Colloids by Particle Lithography.”
Langmu
ir
,
21
,
4813
-
4815

(2005).

30

Salerno, Michael B.; Rothstein, Sam; Nwachukwu, Chisomaga; Shelbi, Haithem;
Velegol, Darrell; Logan, Bruce E. “Differences between chemi
-
sorbed and physi
-
sorbed
biomolecules on particle deposition to hydrophobic surfaces.”
Environmental Science &
Technolog
y
,
39
, 6371
-
6377
(2005).

31

Jones, Joseph F.; Holtzer, Gretchen L.; Snyder, Charles; Yake, Allison M.; Velegol,
Darrell. “Charge nonuniformity light scattering.”
Colloids and Surfaces A
,
267
, 79
-
85
(2005).

32

Holtzer, Gretchen L.; Velegol, Darrell. “Limitations

of differential electrophoresis for
measuring colloidal forces: A Brownian dynamics study.”
Langmuir
,
21
, 10074
-
10081

(2005).

33

Kim, Hye
-
Young; Sofo, Jorge O.; Velegol, Darrell; Cole, Milton W.; Mukhopadhyay,
Gautam. “Static Polarizabilities of Dielectric
Nanoclusters.”
Physical Review A
,
72
,
053201
-
1 to 053201
-
8 (
2005).

34

Kline, T. R.; Paxton, W. F.; Wang, Y.; Vele
gol, D.; Mallouk, T. E.; Sen, A
. “
Catalytic
Micropumps: Microscopic Convective Fluid Flow and Pattern Formation
.”
J
ournal of the
American Chemical

Society
,
127
, 17150
-
17151 (2005).

35

Kim, Hye
-
Young; Sofo, Jorge O.; Velegol, Darrell; Cole, Milton W.; Lucas, Amand A.
“Van der Waals forces between nanoclusters: importance of many
-
body effects.”
Journal
of Chemical Physics
,
124
, 074504
-
1 to 074504
-
4
(2006).

36

Jones, Joseph, F.; Velegol, Darrell.
“Laser Trap Studies of End
-
on E. coli Adhesion to
Glass.”
Colloids & Surfaces B
,
50
, 66
-
71 (2006).

37

Jones, Joseph F.; Waters, Dale; Flamm, Matthew; Velegol, Darrell. “Orientation of
irreversible adhesion of spher
ical particles on prolate spheroidal collectors.”
Journal of
Colloid and Interface Science
,
299
, 696
-
702 (2006).

38

Velegol, Darrell. “Nanoscale charge nonuniformity on colloidal particles.”
chapter
15
for
Molecular and Colloidal Electro
-
optics

(Surfactant Sc
ience Series, vol 134),
eds Stoyl
P.
Stoylov and Maria Stoimenova (2006).

39

Yake, Allison M.; Panella, Rocco A.; Snyder, Charles E.; Velegol, Darrell. “Fabrication
of Doublets by a Salting Out


Quenching


Fusing Technique.”
Langmuir
,
22
, 9135
-
9141

(2006).

40

Salerno, Michael B.; Flamm, Matt; Logan, Bruce E.; Velegol, Darrell. “Transport of
Rodlike Colloids through Packed Beds.”
Environmental Science & Technology
,
40
,
6336
-
6340

(2006).

7
-
19

41

Kim, Hye
-
Young; Sofo, Jorge O.; Velegol, Darrell; Cole, Milton W. “Fully ret
arded van
der Waals interaction between dielectric nanoclusters.”
Journal of Chemical Physics
,
125
,
125, 174303
-
1 to
174303
-
8

(2006).

42

Kline, Timothy R.; Iwata
, Jodi; Lammert, Paul E., Mallouk, Thomas E.; Sen, Ayusman;
Velegol, Darrell. “Catalytically
-
driven Colloidal Patterning and Transport.”
Journal of
Physical Chemistry B
,
110
, 24513
-
24521 (2006).

43

Velegol, Darrell; Holtzer, Gretchen L.; Radović
-
Moreno,
Aleks
andar F.
; Cuppett,
Joshua
D.


Force Measurements between Sub
-
100 nm Colloidal Particles
.”
Langmuir
,
23
, 1275
-
1280 (2007).

44

Kim, Hye
-
Young; Sofo, Jorge O.; Velegol, Darrell; Cole, Milton W.; Lucas, Amand A.
“Van der Waals forces between dielectric nanocluste
rs.”
Langmuir
,
23
, 1735
-
1740
(
2007
).

45

Parekh, Aron; Velegol, Darrell. “
Collagen Gel Anisotropy Measured by 2
-
D Laser Trap
Microrheometry
.”
Annals of Biomedical Engineering
,
35
, 1231
-
1246
(
2007
).

46

Yake, Allison M.; Zahr, Alisar S.; Jerri, Huda A.; Pishko, Mic
hael V.; Velegol, Darrell.
“Localized Functionalization of Individual Colloidal Carriers for Cell Targeting and
Imaging.”
Biomacromolecules
,
8
, 1958
-
1965 (2007).

47

Velegol, Darrell. “
Assembling colloidal devices by controlling interparticle forces
,”
Journal

of Nanophotonics
,
1
, 012502 (p 1
-
25) (2007).

Invited review article.

[DOI:
10.1117/1.2759184
].

48

Yake, Allison M.; Snyder, Charles E.; Velegol, Darrell. “Site
-
Specific Functionalization
on Individual Colloids: Size Control, Stability and Multi
-
Layers.”
Langmuir
,
23
, 9069
-
9075 (2007).

49

Hong, Yiying; Blackman, Nicole M.K.; Kopp, Nathaniel D.; Velegol, Darrell; Sen,
Ayusman. “Chemotaxis of Non
-
Biological Nanorods.”
Phys
ical

Rev
iew

Lett
ers
,
99
,
178103 (p 1
-
4) (2007)
.

See Highlight

“Nano Steams Ahead”

in
Natu
re
,
450
, 5 (2007).

"Tiny rods steer themselves" at http://physicsworld.com/cws/article/news/31730 and
http://nanotechweb.org/cws/article/tech/

31740;jsessionid=2B7509820E5AA2DBDE155798D3F075BC (8nov
2007); "Nano
steams ahead" http://www.nature.com/nature/journal/v450/n7166/pdf/450005a.pdf.

50

Velegol, Darrell. “
Fabrication of high
-
value particle assemblies
,”
Rubber & Plastic
News
,
37
, 14
-
15 (
26 November
2007). Invited article.

51

Parent, Mary E.; Snyder, Charles E.; Kopp, Nathaniel; Velegol, Darrell. “Localized
Quorum Sensing in Vibrio fischeri.”
Colloids Surfaces B
,
62
, 180
-
187 (2008).

52

McDermott, Joseph J.; Velegol, Darrell. “
Simple Fabrication of Metallic Colloidal
Doublets
Having Electrical Connectivity
.”
Langmuir
,
24
, 4335
-
4339 (
2008
).

53

Cole, Milton W.; Velegol, Darrell.
“Van der Waals Energy of a 1
-
Dimensional Lattice.”
Molecular Physics
,

106
,
1587
-
1596 (2008).

54

Chaturvedi, Neetu; Jerri, Huda; Velegol, Darrell. “
Design and
characterization of
randomly
-
speckled spheres
.”
Langmuir
,
24
,
7618


7622

( 2008).

55

Jerri, Huda; Dutter, Rachel; Velegol, Darrell.

Fabrication of Stable Anisotropic
Microcapsules
.”
Soft Matter
,
5
, 827
-
834 (2009).

56

Snyder, Charles E.; Ong, Melissa; Velegol,

Darrell. “In Solution Assembly of Colloidal
Water.”
Soft Matter
,
5
, 1263
-
1268
(2009).


[DOI: 10.1039/b810882j]

57

Velegol, Darrell; Shori, Shailesh; Snyder, Charles E. “Rayleigh
-
Bénard Instability in
Sedimentation.”
Industrial & Engineering Chemistry
Research
,

48
, 2414
-
2421 (2009).
[
DOI: 10.1021/ie800720k
]. I
nvited paper to special issue honor
ing Professor John L.
Anderson.

8
-
19

58

Cole, Milton W.; Velegol, Darrell; Kim, Hye
-
Young; Lucas, Amand A. “
Nanoscale van
der Waals Interactions
,”
Molecular Simulation
,

35
, 849
-
866
(
2
009).

Invited review
article.

59

Nel, Andre E.; Mädler, Lutz; Velegol, Darrell; Xia, Tian;
Hoek, Eric M.; Somasundaran,
Ponisseril; Klaessig, Fred; Castranova, Vince; Thompson, Mike
. “Bio
-
physicochemical
interactions at the nano
-
bio interface:

implications for biological use and safety
assessment of engineered nanoparticles.”
Nature Materials
,
8
, 543
-
557 123 (
2009
).

60

Sen, Ayusman; Ibele, Michael; Hong, Yiying; Velegol, Darrell. “Chemo and Phototactic
Nano/Microbots,”
Faraday Discussion
s
,
143
, 1
-
13 (2009)
.

61

Hong, Yiying; Velegol, Darrell; Chaturvedi, Neetu; Sen, Ayusman. “
Biomimetic
behavior of synthetic particles: from microscopic randomness to macroscopic control.”
Physical Chemistry Chemical Physics
,
12
, 1423
-
1435

(
2010
).

Invited Perspective article.

62

Jerri, Huda A.;
Sheehan
,
William P.
;
Snyder
,
Charles E.
; Velegol, Darrell. “
Prolonging
Density Gradient Stability
,”
Langmuir
,
26
, 4725
-
4731 (
2010
).

63

Chaturvedi, Neetu; Hong, Yiying; Sen, Ayusman; Velegol, Darrell, “Magnetic
E
nhancement of Phototaxing Catalytic Motors,”
Langmuir
,
26
, 6308
-
6313 (
2010
).

64

Cole, Milton W.; Gergidis, Leonidas N.; McNutt, Jessica P.; Velegol, Darrell; Kim, Hye
-
Young; Bond, Zachary K.
“Many
-
body van der Waals forces involving chains.”
Journal
of Nano
photonics
,
4
,
041560
(15 pages)
(2010)
. Invited article.

65

Ramírez, Laura Mely; Milner, Scott T.; Snyder, Charles E.; Colby, Ralph H.; Velegol,
Darrell. “Controlled Flats on Spherical Polymer Colloids,”
Langmuir
,
26
, 7644
-
7649
(2010
)
.

66

Velegol, Darrell; Jerr
i, Huda A.; McDermott, Joseph J.; Chaturvedi, Neetu. “Micro
-
factories for Colloidal Assemblies,”
AIChE Journal
,
56
, 564
-
569 (2010).
This is an
invited Perspective.

67

McDermott, Joseph J.; Chaturvedi, Neetu; Velegol, Darrell. “Functional Colloidal
Trimers by

Quenched Electrostatic Assembly.”


Physical Chemistry Chemical Physics
,
12
, 11930

11937

(2010).

Invited paper for special issue on colloidal assembly.

68

Chaturvedi, Neetu; Hsiao, Erik; Velegol, Darrell; Kim, Seong H. “Mask
-
less fabrication
of nanowells usi
ng chemically reactive colloids.”
Nano Letters
,
11
, 672
-
676
(
2011
).

Corrigenda
Nano Letters
,
11
, 3511 (2011).

69

González Serrano
,
César; McDermott, Joseph J.
;
Velegol
,
Darrell
.

Sediments of Soft
Spheres Arranged by Effective Density.”
Nature Materials
,
1
0
, 716
-
721 (2011).

70

Juluri, Bala Krishna; Chaturvedi, Neetu; Hao, Qingzhen;
Lu
,
Mengqian
;
Velegol
,
Darrell
;
Jensen
,
Lasse
; Huang, Tony Jun. “Scalable Manufacturing of Plasmonic Nanodisk

Dimers and Cusp Nanostructures Using Salting
-
out Quenching Method and Colloidal
Lithography.”
ACS Nano
,
5
,
5838

5847

(2011).

71

Jerri, Huda A.; Adolfsen, Kristin J.;

McCullough, Lauren R.; Velegol, Darrell; Velegol,
Stephanie B. “Anti
-
microbial sand via adso
rption of cationic Moringa oleifera protein,”
Langmuir
,
28
, 2262
-
2268 (2012).

72

Chaturvedi, Neetu; Juluri, Bala Krishna; Hao, Qingzhen; Huang, Tony Jun; Velegol,
Darrell. “Simple Fabrication of Snowman
-
like Colloids,”
Journal of Colloid and
Interface Scienc
e
,
37
1, 28
-
33
(
2012
).

73

Ramirez, Laura Mely; Smith, Adrian S.; Unal, Deniz B.; Colby, Ralph H.; Velegol,
Darrell. “Self
-
assembly of Doublets from Flattened Polymer Colloids,”
La
ngmuir
,
28
,
4086
-
4094 (2012).

74

McDermott, Joseph J.; Daher, Majd; Klara, Steve; Se
n, Ayusman; Velegol, Darrell.
“Spontaneous Diffusiophoretic Microflows in Disturbed Geologic Formations,”
accepted

to
Langmuir

(
oct
2012
).

9
-
19

75

Chiang, Tso
-
Yi; Velegol, Darrell. “
Localized Electro
-
osmosis (LEO) Induced by
Spherical Colloidal Motors
.” Submitted to
Langmuir

(oct2012).


Current grants

1

“Self
-
moving Catalytic Nanomotors,” Air Force Office of Sponsored Resea
rch
(15sep2010
-
14sep2013 for $53
0,000). PI: Ayusman Sen (50%), co
-
PI Darrell Velegol
(50%). Velegol = 1.0 month Summer.

2


IDR:
Emergent Assembly and Patterning of Dynamic Catalytic Motor Systems
,”
National Science Foundation CBET grant
#1014673
(
15sep2010
-
31aug2013
for
$600,000). PI: Darrell Velegol (50%), co
-
PI A
yusman Sen (50%). Velegol = 0.5

month
Summer.

3


Controlling Rheolog
y and Lubrication by Tuning Colloidal Interactions,” National
Science Foundation CBET

1033851

(15sep2010
-
31aug2013 for $290,000). PI: Ralph
Colby (50%), co
-
PI: Darrell Velegol (50%). Velegol = 1.0 month Summer.

4


Molecular
-
to
-
Colloidal Scale Modeling of Pa
rticle Surfaces
,” Dow Chemical Company
(01jan2012


31dec2014 for $450,000). PI: Darrell Velegol (33%), co
-
PIs: Scott Milner,
Kristen Fichthorn. Velegol = 0.0 month Summer.


NSF support within the past 5 years

1.

“Bottom Up Assembly of Metal and Semiconduct
or Nanowires: Fundamental Forces to
Nanoelectronic Circuits”, National Science Foundation NIRT Grant #
CCR
-
0303976
, $1 000
000 (15 Aug 2003


31 Jul 2008). (PI: Darrell Velegol 25%, co
-
PIs: Kristen A. Fichthorn,
Theresa Mayer, Christine D. Keating).

2.

“Buildi
ng colloidal assemblies via site
-
specific bonding regions.” National Science
Foundation CBET Grant #
0651611
, $240 000 (1 Apr 2007 to 31 Mar 2010). PI: Darrell
Velegol (100%). Velegol = 0.0 month Summer. This grant ended in Mar 2010.

3.


Colloidal Polymer C
hains: Construction, Statics and Dynamics
,” National Science
Foundation CBET Grant #0730780 (August 2007 to August 2011, $240
,
000). PI Ralph
Colby (50%), co
-
PI Dar
rell Velegol (50%). Velegol = 1
.0 month Summer.


Proposals Pending

1

“Will this Moringa seed clean my water? Linking the appearance, history and taste of
Moringa oleifera seeds to their ability to produce potable water.” Submitted to the Gates
Foundation (nov 2011), $100,000.

PI:

Stephanie B. Velegol
, co
-
PIs
Darrell Veleg
ol
and
Ricky Bates. Velegol = 0.0 month Summer.

2


Engineered Moringa Antimicrobial Peptides (M
-
AMPS) on Carrier Particles
,” submitted
to the National Science Foundation (01aug2012


31jul2014), $367,000. PI: Darrell
Velegol, co
-
PIs: Thomas Wood and Step
hanie B. Velegol. Velegol = 0.25 months
Summer.


Previous grants completed

1

“Measuring the Effect of Nanoscale Charge Nonuniformity on Colloidal Forces,”
National Science Foundation
CAREER
Grant # CTS
-
9984443, $2
34

000 (March 2000


February 2004).

2

“Charge

Nonuniformity and the Stability of Particles in Nonaqueous Colloidal
Dispersions,” Petroleum Research Fund type G Grant # 35400
-
G9, $25 000 (September
2000


August 2002).

3

“Molecular Level Analysis of Macromolecule
-
Surface Interactions in Bacterial
Adhesi
on.” National Science Foundation CRAEMS Program, CH3
-
0089156 , $2,512,000
10
-
19

(September 2000


August 2005). (PIs: Bruce Logan, Darrell Velegol, John Chorover,
Menacham Elimelech, James Kubicki).

4

“Green Engineering of Dispersed Nanoparticles: Measuring and M
odeling Nanoparticle
Forces.” Environmental Protection Agency
STAR Grant # R
-
82960501
, $370 000
(January 2002


December 2004). (PIs: Darrell Velegol and Kristen A. Fichthorn)

5

“Center of Excellence in Nanoparticulate Science and Engineering.” to Ben Frankl
in
Technology Center
, $
8
0 000

(1 July 2002


30 Jun 2003)

(PIs: James H. Adair, Darrell
Velegol).

6

“Bottom Up Assembly of Metal and Semiconductor Nanowires: Fundamental Forces to
Nanoelectronic Circuits”, National Science Foundation NIRT Grant #
CCR
-
0303976
,

$
1
000 000

(
15 Aug
2003



31
Jul
2008
).

(PI: Darrell Velegol

25%
, co
-
PIs: Kristen A.
Fichthorn, Theresa Mayer, Christine D. Keating)

7

“Center of Excellence in Nanoparticulate Science and Engineering.” to Ben Franklin
Technology Center, $80 000 (1 July 200
3



30 Jun 2004
) (PIs: James H. Adair, Darrell
Velegol).

8


NER: Nanoparticle stability by quantum ‘design’ of van der Waals forces.” National
Science Foundation NER
grant
CTS
-
0403646
, $130 000 (
1 Jul 2004


30 Jun 2005
). PIs:
Darrell Velegol and Milton W.
Cole.

9

“Center of Excellence in Nanoparticulate Science and Engineering.” to Ben Franklin
Technology Center, $80 000 (1 July 2004


30 Jun 2005) (PIs: James H. Adair, Darrell
Velegol).

10


Site
-
specific chemi
stry on colloidal particles by ‘
p
article lithography
’.”

Petroleum
Research Fund Grant # 43453
-
AC10, $80 0
00 (September 2005


August 2007
).

11


Atomic
-
Scale Simulation of Many
-
Body Forces in Colloidal Nanoparticle

Suspensions.”
Petroleum Research Fund ($90 000, 1 Sep 2007 to 31 Aug 2009). PI: Kristen A.
Ficht
horn, co PIs: Darrell Velegol and Milton Cole.

12

“Nanocolloidal forces for stability or assembly.” Department of Energy Basic Energy
Sciences Grant #
DE
-
FG02
-
07ER46414

($
789,366
, 15 Aug 2007


14 Aug 2010). PIs:
Darrell Velegol (33%), Milton Cole, Kristen Fi
chthor
n. Velegol = 1.0 month Summer
.

13

“Building colloidal assemblies via site
-
specific bonding regions.” National Science
Foundation CBET Grant #
0651611
, $240 000 (1 Apr 2007 to 31 Mar 2010). PI: Darrell
Velegol (100%
). Velegol = 0.0 month Summer
.

14


Colloi
dal Polymer Chains: Construction, Statics and Dynamics
,” National Science
Foundation CBET Grant #0730780 (August 2007 to August 2011, $240
,
000). PI Ralph
Colby (50%), co
-
PI Dar
rell Velegol (50%). Velegol = 1.0 month Summer
.

15

“Controlling Rheology and Lubr
ication by Tuning Colloidal Interactions,” National
Science Foundation CBET (01aug2010
-
31jul2011 for $290,000). PI: Ralph Colby (50%),
co
-
PI: Darrell Velegol (50%). Velegol = 1.0 month Summer.

16


Harvesting potable and storable water with Moringa seeds and
sand
,” Environmental
Protection Agency P3 Student Competition (01aug2010
-
31jul2011 for $10,000). PI:
Darrell Velegol (34%), co
-
PIs: Stephanie B. Velegol (33%) and Richard Schuhmann
(33%). Velegol = 0.0 month Summer. This is a 1
-
year grant to support und
ergraduate
students.

17


Micro/Nanobots for Advanced Oil Recovery
,” Advanced Energy Consortium
(15aug2011
-
14aug2012 for $250,000). PI: Ayusman Sen (67%), co
-
PI: Darrell Velegol
(33%). Velegol = 1.0 month academic year.



4

Petroleum Research Fund SE (travel
) grants,
many

National Science Foundation
Research Experience for Undergrads grants
.



11
-
19

Equipment & Facilities



safety. Fume hoods

(including a biological laminar flow hood)
, water showers, eye wash,
fire extinguisher, lab aprons, standard goggles, laser
goggles, gloves.



space.
1500

ft
2

lab space.



video microscopy.
two microscopes: Nikon TE2000 and
Nikon TE 300
. Both are

inverted microscope
s

with various objectives (4×
-

100×
, including a water immersion
objective
) and fluorescence equipment, Prior motori
zed stage
s

(200 nm resolution)
, Cohu
4010 CCD camera, digital image processing software and hardware, Newport vibration
isolation table
s
.



Wyatt 18 angle static light scattering EOS device.



laser trap. 25
00 mW
NdYag
solid state (
1064

nm) laser trap.
Trap i
s moveable by
scanning galvanometers.



small angle light scattering. 17 mW laser with full detection, for measuring interparticle
forces and stability.



differential electrophoresis flow cell. Keithley constant current source/measurement
device, peristaltic

pump for flow,
syringe pump for flow,
platinum electrodes.



rheometer. Rheometrics RFS3 controlled strain rheometer.



latex reactor. In
-
house assembly for manufacturing polymer colloids.



incubators. Floor incubator, Focht

stage incubator for microscope, bac
terial controlled
temperature shaker



compu
tation. 4
computers, for word processing to numerical calculations.



standard equipment. Millipore water purification, stirring/heating plates,
syringe pump,
water baths,
electronic balances, Pipetmen, centrifuge, r
efrigerators, glassware.



UV
-
vis spectrophotometer.



bacterial growth equipment (a
utoclave, deep freeze, supplies).



on campus

shared user facilities (open access)
: FESEM,
TEM, confocal microscopy, cell
counting,
ZetaPALS, Nanofab

(electron beam lithography,
photolithography.



Invited Presentations

1

“The Physics of Community”,

Mechanisms of Mind

group at Penn State University,
April 2012.

2

“Colloid Science in the Velegol Lab,” Dow Chemical Company, Freeport TX,

April 2012.

3


Planning ahead and moving forward
,” to the Penn State section of the
National Society
of Collegiate Scholars

(NSCS), November 2011. The subject of the talk concerned the
Penn State
situation

that occurred over 15 years, which became known in November
2011.

4

“CENTER Your Life,”
Comprehensi
ve & Advanced Leadership Training Courses for
Nurses,
Southern Philippines Medical Center
, via Skype

webinar
, November 2011.

5

“Self
-
generated microflows and colloidal motor transport,”
University of Oklahoma

(Chemical Engineering)
,
September

2011.

6

“Self
-
generated microflows and colloidal motor transport,”
Rice University

(Chemical
Engineering)
, September 2011.

7


Colloidal Assemblies that DO Somethin
g”, International Latex Conference, Akron OH,
July 2011.

8

“Sorting Colloidal Particles: Thermodynamics o
r transport


which wins?”, Colorado
School of Mines (Chemical Engineering), January 2011.

12
-
19

9

“Character and Excellence: Hallmarks of NSCS Scholars,” National Society of Collegiate
Scholars, Induction Ceremony Keynote, Penn State University, 03 October 2010.

10

“Sorting Colloidal Particles: Thermodynamics or transport


which wins?”, Notre Dame
(Chemical Engineering), March 2010.

11

“Sorting mixtures of colloidal particles,” Illinois Institute of Technology, November
2009.

12


Chemotaxis of Non
-
Biological Particles
,” U
niversity of Pennsylvania, October 2009.

13

“Sedimentation separation of colloidal particles,” Tulane University, September 2009.

14


Multi
-
Body Van Der Waals Forces
,” American Chemical Society Colloids and Surface
Science Symposium, Columbia University, June 20
09.

15

“Sedimentation separation of colloidal particles,” Penn State University, April 2009.

16

“7 Steps to Fabricating a Colloidal Machine.” 21
st

International Symposium on Polymer
Analysis and Characterization (ISPAC), University of Delaware, June 2008.

17

“Pho
totaxis of nonbiological rods.” Penn State MRSEC, May 2008.

18


Colloidal Fabrication Using Site
-
Specific Interparticle Forces
.” Gordon Research
Conference on Colloidal, Macromolecular, and Polyelectrolyte Science, Ventura CA,
February 2008.

19

“The fabrication of colloidal assemblies.” Department of Chemical Engineering, Texas
A&M University, October 2007.

20

“Forces between nanocolloids.” California Nanosystems Institute (CNSI) at UCLA, for
workshop on “Bio
-
physicochemical interactions of engineer
ed nanomaterials,”
September 2007.

21

“The fabrication of colloidal assemblies.” Department of Chemical Engineering,
University of Virginia, September 2007.

22

“Designing processes for fabricating colloidal assemblies.” Department of Chemical
Engineering, Unive
rsity of Louisville (KY),
April

2007.

23

“Designing processes for fabricating colloidal assemblies.” Department of Chemical
Engineering, Carnegie Mellon University, April 2007.

24

“Designing processes for fabricating colloidal assemblies.” Department of Chemical

Engineering, University of Puerto Rico (
Mayaguez
), February 2007.

25


Fabrication of well
-
controlled particle assemblies
.” Engineering Science & Mechanics,
Penn State University, October 2006.

26


Colloidal molecules: fabrication and engineering design
.” Depart
ment of Chemical
Engineering, City College of New York, October 2006.

27

“Patterning on individual colloidal particles using the particle lithography process.”
American Chemical Society (PDSM division), San Francisco, September 2006.

28


Colloidal molecules: fab
rication and engineering design
.” Procter & Gamble, Cincinnati
OH, August 2006.

29


Colloidal molecules
:

fabrication and engineering design
.” American Chemical Society
Colloids and Surface Science Symposium, University of Colorado (Boulder), June 2006.

30

“Collo
idal atoms and molecules: design and fabrication.” 38
th

American Chemical
Society Central Regional Meeting, Frankenmuth MI, May 2006.

31


Nanoscale charge nonuniformity on polymer colloid latexes
.” Dow Chemical, Midland
MI, May 2006.

32

“Colloidal atoms and mole
cules
: Fabrication and engineering design
.” World Congress
on Particle Technology (Orlando FL), April 2006.

33


Colloidal molecules
: Synthesis and engineering design
.” Materials Science Department,
University of New Hampshire, April 2006.

34

“Colloidal
molecules”: Synthesis and engineering design. Rohm & Haas (Spring House
PA), January 2006.

13
-
19

35

“Measuring charge nonuniformity on colloidal particles.” American Institute of
Chemical Engineers Annual Meeting, Cincinnati, November 2005. [Velegol, Paul
McKenzi
e, and John Walz organized this invited session for John L. Anderson’s 60
th

birthday.]

36

“Colloidal molecules”: Synthesis and engineering design
. University of Florida
(Gainesville), October 2005.

37


Nanoscale charge nonuniformity on latex particles
.” Gordon

Conference on Polymer
Colloids, Tilton NH, July 2005.

38


Processing an
alysis for “colloidal molecules.” General Electric Plastics, Mt. Vernon IN,
Jun 2005.

39


Engineering forces between nanocolloids
.” American Chemical Society Colloids and
Surface Science Symposium, Clarkson University, June 2005.

40

“A story of colloidal molecules”. Food Science Department, Penn State University,
February 2005.

41

“Charge nonuniformity on individual particles: characteri
zation, consequences, and
control.” Materials Science Department, University of Illinois (Urbana
-
Champaign),
November 2003.

42


Nanoscale charge nonuniformity and its effects on interparticle forces
.”
International
Conference on Surface and Colloid Science
(
IACIS), Brazil, September 2003.

43

“Changing the World with the 7 Habits.” Department of Chemical Engineering, Bucknell
University, January 2003.

44

“Molecular engineering of colloidal forces.” Department of Physics, Penn State
University, October 2002.

45

“Measu
ring and modeling nanoparticle forces.”
EPA Nanotechnology
Grantees
Conference, Environmental Protection Agency, Washington DC (Aug 2002).

46

“Does nanoscale charge nonuniformity control bulk colloidal behavior?”, Department of
Chemical Engineering, West Virg
inia University, January 2001.

47

“Does nanoscale charge nonuniformity control bulk colloidal behavior?”, Department of
Chemical Engineering, University of Colorado, December 2000.

48

“Does nanoscale charge nonuniformity control bulk colloidal behavior?”, Depart
ment of
Chemical Engineering, Johns Hopkins University, October 2000.

49

“Does nanoscale charge nonuniformity control bulk colloidal behavior?”, Department of
Chemical Engineering, University of Michigan, September 2000.

50

“How Does Charge Nonuniformity on Coll
oidal Particles Affect Bulk Behavior?”,
Innovations Workshop, Particulates Materials Center, Penn State University, May 2000.

51

“Particle Dispersion and Rheology in Aqueous Media,” Chemicals and Polymers
Roundtable, Air Products and Chemicals Incorporated, A
pril 2000.

52

“How Does Charge Nonuniformity on Colloidal Particles Affect Bulk Behavior?”,
National Meeting of the American Chemical Society, San Francisco, March 2000.

53

“Determing Cell Traction Forces of Fibroblasts on Collagen Gels,” Bioengineering
Departme
nt, Penn State University, January 2000.

54

“Understanding Bulk Colloidal Behavior from Interparticle Forces,” Department of
Chemical Engineering, Yale University, January 2000.

55

“Surprising Measurements of the Forces between Colloidal Particles,” Particulates

Materials Center, Penn State University, June 1999.

56

“Determining Cell Traction Forces of Fibroblasts on Collagen Gels,” Department of
Mathematics, University of Melbourne; Chemistry Department, University of Newcastle,
March 1999.

57

“Measuring the Colloidal

Forces between Two Brownian Particles,” Advanced Mineral
Products Center (AMPC), University of Melbourne, March 1999.

14
-
19

58

“Determining the Forces between Colloidal Spheres Using Differential Electrophoresis,”
1998 Victor K. La

Mer Award Lecture, American Chem
ical Society Colloids and
Surfaces Science Symposium, The Pennsylvania State University (State College), June
1998.

59

“The Colloidal Forces between Polystyrene Latex Particles in Suspension,” Ian Wark
Research Institute, University of South Australia (The Le
vels, Australia), April 1996.

60

“Determining the Forces between Colloidal Spheres Using Differential Electrophoresis,”
Advanced Mineral Products Center (AMPC), University of Melbourne, January 1996.

61

“Determining the Forces between Colloidal Spheres Using
Electrophoresis,” Condensed
Matter Physics Group (Department of Physics), Carnegie Mellon University, October
1995.


Other c
onference papers presented

by Velegol

(many
others
by students
/
post
-
docs)

1

“Plasmonic Nanodisk Dimers and Cusp Nanostructures.” Amer
ican Institute of
Chemical Engineers Annual Meeting, Minneapolis, October 2011. (co authors

Bala
Krishna Juluri, Neetu Chaturvedi, Qingzhen Hao, Mengqian Lu, Lasse Jensen, Tony Jun
Huang)

2

“Maskless Fabrication of Nanowells Using Chemically Reactive Colloid
s.” American
Institute of Chemical Engineers Annual Meeting, Minneapolis, October 2011. (co authors
Neetu Chaturvedi, Erik Hsiao, Seong H. Kim)

3

“Storable, Drinkable Water using Moringa oleifera seeds.” American Institute of
Chemical Engineers Annual Meet
ing, Minneapolis, October 2011. (co authors Stephanie
B. Velegol, Huda A. Jerri, Kristin J. Adolfsen, Lauren R. McCullough)

4


Sediments of soft spheres arranged by effective density.” American Chemical Society
Colloids and Surface Science Symposium, McGill
University, June 2011. (with coauthors
Cesar

Gonzalez Serrano

and Joseph J.
McDermott
)

5

“Magnetic enhancement of phototaxing catalytic motors.” American Chemical Society
Colloids and Surface Science Symposium, McGill University, June 2011. (with coauthors
N
eetu Chaturvedi, Yiying Hong, Ayusman Sen)

6


Sorting Colloidal Particles: Thermodynamics or transport


which wins?”

American
Institute of Chemical Engineers Annual Meeting, Nashville, November 2009. (co authors
Cesar Gonzalez Serrano, Joe McDermott
, Kristi

Weggener, Tawanna Hines)

7


“Fabricating colloidal assemblies that undergo chemotaxis and phototaxis,” American
Chemical Society National Meeting, Washington DC, August 2009.

8


Differences Between 2
-
Body and Multi
-
Body Van Der Waals Forces
,” American
Institute of Chemical Engineers Annual Meeting, Philadelphia, November 200
8
. (co
author Milton Cole)

9

“Rayleigh
-
Benard Instability in Sedimentation,” American Chemical Society Colloids
and Surface Science Symposium, North Carolina State Universi
ty, June 2008. (with
coauthors Huda Jerri, Charles Snyder, and Shailesh Shori)

10


Controlling interparticle forces to guide colloidal assembly
,” National Meeting of the
American Chemical Society, Chicago, March 2007. (presented by Velegol).

11


Catalytic nanomo
tor modeling
.” American Institute of Chemical Engineers Annual
Meeting, San Francisco, November 2006. (coauthors Tim Kline, Paul Lammert,
Ayusman Sen, Thomas Mallouk)

12


Modeling nanocolloidal van der Waals dispersion forces
.” American Institute of
Chemical
Engineers Annual Meeting, San Francisco, November 2006. (co authors Hye
-
Young Kim, Jorge Sofo, Milton Cole, Amand Lucas)

13

“Van der Waals forces between nanocolloids.” American Chemical Society Colloids and
Surface Science Symposium, University of Colorado (
Boulder), June 2006.

15
-
19

14


Colloidal atoms and molecules: design and fabrication
”. Poster at Gordon Research
Conference on Colloidal, Macromolecular, and Polyelectrolyte Solutions, Ventura CA
(Feb 2006).

15

“Sy
nthesis of ‘colloidal molecules
”. American Institute

of Chemical Engineers Annual
Meeting, Austin, November 2004.

16


Reducing nanoscale charge nonuniformity on PS Particles
.” ELKIN 2004, Carnegie
Mellon University, June 2004.

17

“van der Waals forces between nanoclusters.”
American Chemical Society Colloids and

Surface Science Symposium, Yale University, June 2004. (with coauthors Mercedes
Calbi, Silvina Gatica, Milton W. Cole)

18


Reducing nanoscale charge nonuniformity on PS Particles
.” American Chemical
Society Colloids and Surface Science Symposium, Yale Unive
rsity, June 2004. (with
coauthor Jason D. Feick)

19


Bacterial Surface Nonuniformity Effects on Adhesion
.”
American Institute of Chemical
Engineers Annual Meeting, San Francisco, November 2003. (with coauthor Joseph F.
Jones).

20


Reduction of Nanoscale Charge N
onuniformity by Temperature Annealing
.” American
Institute of Chemical Engineers Annual Meeting, San Francisco, November 2003. (with
coauthor Jason D. Feick).

21


Interparticle Forces for Clusters of Particles
.” American Institute of Chemical Engineers
Annual Meeting, San Francisco, November 2003. (with coauthor Gretchen L. Holtzer).

22


Easily Implemented Ideas For Teaching Chemical Engineering
.” American Institute of
Chemical Engineers Annual Meeting, San Franci
sco, November 2003.

23


Nanoscale charge nonuniformity on individual particles
.” National Meeting of the
American Chemical Society, New York, September 2003. (with coauthor Jason D.
Feick).

24


Molecular reduction of nanoscale charge nonuniformity
.” American Ch
emical Society
Colloids and Surface Science Symposium, Georgia Tech University (Atlanta), June 2003.
(with coauthor Jason D. Feick)

25

“van der Waals forces between nanoclusters
.”
American Chemical Society Colloids and
Surface Science Symposium, Georgia Tech
University (Atlanta), June 2003. (with
coauthors Mercedes Calbi, Silvina Gatica, Milton W. Cole)

26

“Colloidal stability in the presence of a polyelectrolyte depletant
.” American Chemical
Society Colloids and Surface Science Symposium, Georgia Tech University

(Atlanta),
June 2003. (with coauthor Gretchen L. Holtzer)

27

“Bacterial surface nonuniformity effects on adhesion,” National Meeting of the American
Chemical Society, New Orleans, March 2003. (presented by coauthor Joseph F. Jones).

28


Nanoscale charge nonunif
ormity on colloids in the presence of surfactants and
polyelectrolytes
,” National Meeting of the American Chemical Society, New Orleans,
March 2003. (presented by coauthor Jason D. Feick).

29


Measuring attractive forces between suspended nanoparticles
,” Nati
onal Meeting of the
American Chemical Society, New Orleans, March 2003. (presented by coauthor Gretchen
L. Holtzer).

30


The importance of bacterial
-

and contact
-
surface properties on bacterial adhesion: The
effects of hydrophobicity, surface charge, and ster
ic effects
,” National Meeting of the
American Chemical Society, New Orleans, March 2003. (presented by coauthor Mike
Salerno).

31

“Extending Differential Electrophoresis to Measure Nanoparticle Forces,” American
Institute of Chemical Engineers Annual Meeting,

Indianapolis, November 2002. (with
coauthor Gretchen L. Holtzer).

16
-
19

32

“Nanoscale charge nonuniformity on colloids in the presence of surfactants and
polyelectrolytes,” American Institute of Chemical Engineers Annual Meeting,
Indianapolis, November 2002. (pres
ented by coauthor Jason D. Feick).

33


Extending differential electrophoresis to measure nanoparticle forces
,” IEEE Nanotech
2002 Conference, Washington DC, Aug 2002. (with coauthor Gretchen Holtzer)

34


Controlling Surface Charge Nonuniformity on Colloidal Part
icles and Bacteria
,”
American Chemical Society Colloids and Surface Science Symposium, University of
Michigan (Ann Arbor), June 2002. (presented by coauthor Jason D. Feick)

35


Controlling forces between polystyrene latex particles
,”

American Chemical Society

Colloids and Surface Science Symposium, University of Michigan (Ann Arbor), June
2002. (with coauthors Prasanna K. Thwar and Gretchen Holtzer)

36

“Rotational electrophoresis can be used to measure charge nonuniformity,” American
Institute of Chemical Enginee
rs Annual Meeting, Reno, November 2001. (with coauthor
Jason D. Feick)

37

“How do polyelectrolytes reduce the attractive forces between polymer colloids?”
American Institute of Chemical Engineers Annual Meeting, Reno, November 2001. (with
coauthor Prasanna K.

Thwar)

38

“Measuring charge nonuniformity on bacteria,” National Meeting of the American
Chemical Society, Chicago, August 2001.

39

“Polystyrene latex particles have significant charge nonuniformity,” poster at Gordon
Research Conference (Polymer Colloids), Til
ton NH, July 2001. (with coauthor Jason D.
Feick)

40

“Rotational electrophoresis can be used to measure charge nonuniformity,” American
Chemical Society Colloids and Surface Science Symposium, Carnegie Mellon University
(Pittsburgh), June 2001. (with coauthor

Jason D. Feick)

41

“Relating charge nonuniformity and colloidal stability,” American Chemical Society
Colloids and Surface Science Symposium, Carnegie Mellon University (Pittsburgh), June
2001. (with coauthors Prasanna K. Thwar and Jason D. Feick)

42

“Measureme
nt of Charge Nonuniformity on Colloidal Particles,” American Institute of
Chemical Engineers Annual Meeting, Los Angeles, November 2000. (with coauthor
Jason D. Feick)

43

“Measuring Particle Size and Interparticle Gap with Nanometer Precision Using Optical
Mi
croscopy,” American Institute of Chemical Engineers Annual Meeting, Los Angeles,
November 2000. (with coauthor Prasanna K. Thwar)

44

“Tangential Forces between Non
-
touching Colloidal Particles,” International Conference
on Colloid and Interface Science (Brist
ol, England), July 2000.(with coauthors Sebastian
Catana, John L. Anderson, and Stephen Garoff)

45

“Charge Nonuniformity on Colloidal Particles,” American Chemical Society Colloids
and Surface Science Symposium, Lehigh University (Bethlehem, PA), June 2000. (
with
coauthor Jason D. Feick)

46

“Measured Estimates of Charge Nonuniformity on Polystyrene Latex Spheres,”
American Institute of Chemical Engineers Annual Meeting, Dallas, November 1999.
(with coauthor Jason D. Feick)

47

“Determining Cell Traction Forces of Fib
roblasts on Collagen Gels,” American Institute
of Chemical Engineers Annual Meeting, Dallas, November 1999. (with coauthors G.
Steven Vanni and Frederick Lanni)

48


Relating the Structural Rearrangement of Collagen Gels to Cell Traction Forces,”
American Chem
ical Society Colloids and Surface Science Symposium, Massachusetters
Institute of Technology (Boston), June 1999. (with coauthors G. Steven Vanni and
Frederick Lanni)

17
-
19

49

“The Cell Traction Forces between Fibroblasts and Collagen Gels,” American Institute of
Chemical Engineers Annual Meeting, Miami Beach, November 1998. (with coauthors
Frederick Lanni and G. Steven Vanni)

50

“The Mechanical Properties of Collagen Gels,” Americ
an Chemical Society Colloids and
Surfaces Science Symposium, The Pennsylvania State University (State College), June
1998. (with coauthor Frederick Lanni)

51

“The Forces between Silica Particles and Polystyrene Latex Particles,” American
Institute of Chemical

Engineers Annual Meeting, Los Angeles, November 1997. (with
coauthors John L. Anderson and Stephen Garoff)

52

“The Forces between Silica Particles and Polystyrene Latex Particles,” American
Chemical Society Colloids and Surfaces Science Symposium, University

of Delaware
(Newark), June 1997. (with coauthors John L. Anderson and Stephen Garoff)

53

“Determining the Forces between Latex Particles Using Differential Electrophoresis,”
American Institute of Chemical Engineers Annual Meeting, Chicago, November 1996.
(wi
th coauthors John L. Anderson and Stephen Garoff)

54

“Electrophoretic Rotation of Colloidal Doublets,” American Institute of Chemical
Engineers Annual Meeting, Chicago, November 1996. (with coauthors Yuri
Solomentsev, John L. Anderson, and Steven L. Carnie).

55

“An Experimental Determination of the Tangential and Normal Forces between Colloidal
Spheres,” 1st Australian Surface Force Symposium, Blackwood (Victoria, Australia),
February 1996. (with coauthors John L. Anderson and Stephen Garoff)

56

“Determining the Rig
idity of Colloidal Doublets Using Electrophoretic Rotation,”
American Institute of Chemical Engineers Annual Meeting, Miami Beach, November
1995. (with coauthors John L. Anderson and Stephen Garoff)

57

“Electrophoretic Rotation of Doublets: A Probe of Structu
re,” American Chemical
Society Colloids and Surfaces Science Symposium, University of Utah (Salt Lake City),
June 1995. (with coauthors John L. Anderson and Stephen Garoff)


Teaching



Courses taught: ChE 320

(Equilibrium thermodynamics),
ChE 350 (Heat Trans
fer),
ChE 407
(Senior Unit Operations Lab
, now ChE 480
), ChE 451 (Process Control),
ChE 452 (Chemical
Process Safety and Control),
Chem 497A (now Chem 466, Molecular Ther
modynamics),
ChE 497A (Physics of Community),
ChE 528 (Colloids and Nanocolloids),
ChE

597a
(Electrochemical Engineering).



ChE 452: Process Safety and Control. Worked with Robert Nedwick to adapt this course to a
broader range of students in our department, and added a process control component to the
course.



Chem 497A (now Chem 466): Mole
cular Thermodynamics. This course introduces
Chemical Engineering undergrads to molecular thinking and how atomic and molecular
phenomena lead to macroscopic consequences. Using statistical thermodynamics, lattice
models, and other dynamics equations, th
e students see how quantum mechanics, Brownian
motion, and transition state theory lead to measurable parameters like heat capacity,
conductivity, diffusion coefficients, and reaction rate constants.



ChE 528: Colloids and Nanocolloids. This course introdu
ces students to essential theory in
colloidal synthesis, hydrodynamics, interparticle forces, stability, rheology, characterization,
and assembly. We use physics ranging from quantum to continuum, and various chemistry
sources.

18
-
19



ChE 497a: Physics of Commun
ity. Based on independent study
since 1991
, unrelated to his
colloids

research efforts, Velegol
taught this

course about “designing” communities,
learning, motivation, trust,
courage, creativity
and other human aspects.



ChE 597a: Electrochem
ical Engineeri
ng. This course was

co
-
taught with Mike Janik, and it
is a new course in our department.



M
ajor
committee work

at Penn State

Dean’s Advisory Committee for Distinguished Professors
and

Endowed Chair/Professorships
,
2012
-
2013

Penn State AD
-
14 review of
Dean Chris Brady, 2011

Penn State AD
-
14 review of Dean
Renata S. Engel
, 2011

Chemical Engineering ABET Coordinator, 2009


present

Chemical Engineering
Undergraduate Program Coordinator
, 2009


2011


College of Engineering
Sabbatical Leave Committee,
2009
-
2010

Schreyer Honors College
,
Faculty Advisory Committee, 2009


present

Schreyer Honors College
,
Faculty Selection Committee,
2009
-
present


College of Engineering Research Symposium
, J
udge

2009

Penn State Goldwater Selection Committee, 2009
-
2011
.

Fac
ulty Committee for Engaged Scholarship in Philadelphia
, 2008


2011


College of Engineering
Sabbatical Review Committee 200
8 (for 2009
-
2010 sabbaticals)

College of Engineering 5
-
year Strategic Plan Committee for
Health Sciences and Medicine

(2007
-
2008)

Chemical Engine
ering ABET Assessment Committee

(June
2006



present)

Chemical Engineering Graduate Studies Committee (2005


present)

Chemical Engineering Chaired Professorships Committee (2005


present)

Chemical Engineering Department Head Search Committ
ee (August 2004


2005)

Environmental Education Task Force (November 2003


Dec 2004
)

College of Engineering Faculty Council
(September 2004


December 2006
)


Graduate Studies & Research
Sub
-
Committee
(August 2004


December 2006
)


Chair of
Graduate Studie
s & Research Committee

(August 2005
-
December 2006
)

Environmental Institute Advisory Board (August 2000


present)

Chemical Engineering Faculty Search Committee (August 2000


2001)

Chemical Engineering Grad

Recruiting &

Admissions, Chair (May 2000


May 20
04)

Chemical Engineering Graduate Awards Committee (September 1999


2001)


Penn State organizations

Presidential Leadership Academy Mentor, 2010


present.

Faculty Fellow, Laboratory for Public Scholarship
&

Democracy
, “A capacity to sustain”, 2008.

Committee for Engaged Scholarship in Philadelphia
, 2008


2010
.

College of Engineering Environmental Institute (Aug 2000


present
)

Life Sciences Consortium (May 2000


present
)

Materials Research Institute (2003


present)

Particulate Materials Center (Dec 1999


2010
)


Other service

Gordon Research Conference on “
Colloidal, Macromolecular & Polyelectrolyte Solutions
”, vice
chair in Feb 2012
,
and chair in Feb 2014.

Editorial Board Member of Journal of Colloid and Interface S
cience
, Oct 2012


present.

19
-
19

Panelist, “Race to Nowhere” (education

movie), State Theatre, State College, PA. Apr 2012.

Urban Sustainability Leadership Academy
, Advisory Council (2010).

American Chemical Society Symposium organizer (with Maria Santore), “P
atchy Particles and
Surfaces”, Washington DC, August 2009.

American Chemical Society LaMer Award Selection
,

Chair (Jul 2005


Jul 2008)

Organizer, NSF Nanoscale Grantees Conference, 4
-
6 December 2006 (roughly 200 participants)

Guest Editor, Colloids & Surf
aces A, 5 Oct 2005 edition

Editorial Advisory Board of Langmuir (Jan 2005


2011
)

American Chemical Society LaMer Award Selection Committee (Jul 2001


Jul 2003)

ACS
, Continuing Symposium Chair (Colloids & Surface Science), 2000
-
2008

American Chemical Soci
ety Symposium organizer (with Bruce Logan), “Bacterial adhesion”,
New Orleans, March 2003.

American Chemical Society Symposium organizer (with Kristen A. Fichthorn), “Nanocolloid
forces and stability”, New York, September 2003.

American Chemical Society Sy
mposium organizer (with Sharon Glotzer and Mike Solomon),
“Colloidal atoms and Molecules”, Chicago, 24
-
25 March 2007.