Physics of soft matter, surfaces, and nanostructures

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Nov 15, 2013 (3 years and 10 months ago)

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Leading scientist:

S.

Žumer;

Senior scientists:

S.

Kralj, H.

v
an Midden, I.

Muševič, J.

Pirš, A.

Prodan, M.

Remškar,


M.

Škarabot, M.

Vilfan ;

Y
ounger scie
n
tists:

M.

Conradi, G.

Skačej, D.

Svenšek, A.

Šarlah, A.

Vilfan, R.

Žitko;

PhD students
:

B. Črnko, M. Humar, M. Ravnik, U. Tkalec, M. Viršek, A. Vrečko
;

technicians
:

I. Kvasić, S. Mendizza, S. Pirš, E. Zupanič
;


9 FTEs

Physics of soft matter, surfaces, and nanostructures

Jozef Stefan Institute University of Ljubljana


R
esearch methods

C
ollaboration

(local

&
international)

D
ynanamic light scattering

NMR & Rela
xo
met
ry

Magnetic field techniques

Complex optical tweezers

Microfluidics

Tribology

Calo
ri
metry

Lattice
-
Boltzman approach

Experimental tecniques


AFM

STM

Optical tweezers

El
l
ipso
m
etry

Optical microscopy

SEM &TEM

Vapor deposition

Lithography

UHV techniques

Nanoparticle detection

Substrate preparations in clean room

Electro
-
optical studies


Theory, modeling &
simulations

Landau
-

de Gennes approach

Topology


Hydrodynamics

Elastic theory

Kinetic equations

Transport equations

Monte Carlo simulations

Molecular dynamics

Second quantization

Numerical renormalization group

To establish

basic
equipment nearly a
milion


was
invested in 2004
-
08
.

Publications 2004
-
08










~
125 SCI papers
(>15%
-

PRL, Advanced materials,
Science
)



19 chapters
in monographs published by international publishers



3 edited books
and proceedings published by international
p
ublishers


(Springer, Taylor
&
Francis,

and

Kluwer)



7 international patents





~
2300

-

1998
-
2008
papers



~
7800

-

all papers

Citations

Structural forces and 2D colloidal structures

2
008

Assembling of 2D colloidal crystals in nematics




Science 313
, 954 (2006)



2 Plenary lectures at 21
th
ILCC 06, Keystone, USA



Plenary lecture at 9
th
ECLC 05, Lisbon, Portugal

Laser trapping of low refractive

index particles in nematic LC


PRL 2004






2D dipolar

colloidal crystal

2D quadrupolar

colloidal crystal

Colloidal assembly


2D colloidal lattice with

superstructure
PRL 2008








Colloidal particles entangled by a nematic disclination line
PRL 2007

Modeling

Experiment

Structural forces and 2D colloidal structures


2008


Formation via I
-
N thermal quench




Entanglad chain:

Entangled dimer


Dipolar &

quadrupolar

layers

Possible applications of

1D & 2D structures:

Light guiding and

beam stearing





Colloids, complex mesophases,...
2008 →

1D colloidal chain


nematic colloidal
optical microresonators

Application:
Micrometer sized split ring resonator with negative resonant magnetic response

Hierarchical structures


meta materials

Entangled colloidal particles

decorated by small
conductive or dielectric
particles

Nematic colloidal wire


assembling of superstructures

Transport

of

light

along

fluorescent

colloidal

particles,

tightly

entangled

by

defect

lines,

could

be

controlled

by

light
.

F
luorescently
-
labelled
colloidal microcavities,
embedded in a liquid crystal.

Colloids, complex mesophases,...
2008 →


3D nematic colloidal structures: defect & disclination entangled

Possible applications of 3D
colloidal crystals in
photonics

and
plasmonics

Chiral nematic and blue phase colloids

BP2 and colloidal particles

Assembling & modeling

Colloids, complex mesophases,...
2008 →

Modeling of the

responsiveness to external
stimuli: temperature, ultra
-
violet light
irradiation, electric or mechanical field…



colloids covered with
nematic shells
:
topological defect and colloidal
valence control
;




Patterned colloidal particles



Magnetic particles



Dedrimers

as building bloks


Fuctionalization of nematic elastomers

PRL
2008

5nm

Fuctionalization of colloidal particles

Motor proteins: Myosin V

-

mechanics, kinetics, coordination,

branching behaviour

(
Biophys. J

2008
)


Bio & bioinspired systems



2008 →

Active swimmers: 2 cilia

Phys. Rev. Lett

2006

Novel

motors (dynein)

Biomimetic cilia

N cilia, phase waves

Beating patterns

No. 1 ranked proposal
to
International

Human

Frontier Science Program
(HFSP)

2008


(collab
oration:

Leeds, Tok
y
o, Sendai, Ljubljana)

maximum

efficiency

Liquid Crystal Applications
→ 2008


Study of mechanisms affecting performances of LC light modulators

:

-

Alignment surface influence on switching times

-

Ionic contamination/field screening/memory effects/degrad
ed

gray scale performance


[
J. Appl. Phys. 2x, 2006
,
Displays

2004, SPIE 2004 ,
patent granted in EU and USA
]




Novel wide
-
view angel LC light modulators:

H
ighly
T
wisted
L
ight
S
hutters (HTLS)

-


Concept, computer modeling, compensation,


LC blending, prototyping
eye protective
filters


-

Technology transfer to spin
-
off company


Balder Ltd

yielded
the best
filte
r on the market

-

[
SID Digest 2003, 2005, J. Appl. Optics 2008,


3 patents granted in EU, USA
]



Spin
-
off company of IJS, Balder Ltd:

-

World recognized producer

of eye protective
filters
:


60% increase
of sales in USA in 2007 (10% total)


Long term (


4 years)
no. 1 supplier to Germany

(>25%)
,….

-

Breakthrough into the sales network of ESAB


No.1 producer


of welding equipment in EU (2008)

TN LCD

HTLS

Liquid Crystal Applications
2008 →


Research of basic mechanisms affecting
shutter
performances
:



-

anchoring energy of
L
C mono
-
layers on surface
s,


-

i
nfluence

of
adsorbed water molecules on the anchoring energy
,




High light
-
efficiency LCD light shutters:



-

Polarizer free LCD light shutters:

Multilayer CLC light shutters

&


e
lectrically controlled polarizing filter
s


(EU F
P
7


pilot protection
;
invitation of EADS, FOI, Fraunhofer
)
,

-

U
ltra
-
high speed OCB light shutter for medical application


(cooperation with Japanese company Yamamoto).



Invitation to participate in ISO work group



for

“Eye protection standard” (ISO/TC94/SC6/WG2 in WG4):


Only three World best producers

were

invited: 3M, Sperian,
Balder
!



Nematic biosensor

based on
anchoring strength sensor
:


regular array of micrometer scale wells in a solid substrate filled
w
ith



a nematic
LC that are exposed to
dispersion
s

of biological molecules
.





Inorganic nanotubes

→ 2008


WS
2

“nanobuds”

Nano Letters 2008

MoS
2

peapods
-
“mama”
-

tubes

Advanced Matter.
2007

Possible applications:



tribology



catalysis



composite materials

Synthesis and
characterization of new
hybrid nanomaterials

Josef Stefan Institute

“Spin
-
off” company




development, synthesis


and commercialization


of new nanomaterials

Detection of
nanoparticles in air

Prototype based on our
inovative idea





Participation in legislation
process in nanosafety

EU projects:

-
Industrial FOREMOST


(lubricants)

-

Industrial NANOSAFE2


(detection of oparticles)

-

IMPART (nanosafety)

-

3
national

patents

-

2 PCT patent
applications

-

Adv. Matter. 2004,

100 citations!

Drop of friction using MoS
2

“mama”
-
tubes

Hybrid nanomaterials for use in
tribology, solar cells, polymer
composites and in catalysis.

MoS
2

“mama”
-
tubes in TBAP

Photovoltaic effect in visible light

Kalin, SF
-
UL

-

Collaboration in legislation for safe nanotechnology

-

Preliminary monitoring of polution with
nanoparticles at exposed locations in Slovenia

Synthesis of new hybrid inorganic
nanomaterials

Development of a new generation of a
prototype for detection of nanoparticles;

-

patent application


-

cheap portable detector

-

commercialization

Inorganic nanotubes and nanoparticles

2008 →


Electrical mobility diameter

Nanotoxicity data for public use

Nanoparticle size distribution before and after
opening a hard coating reactor (IonBond, UK)

Synthesis of ordered surface nanostructures
→ 2008


Cu(111)
,
T=9K

1nm

STM single atom manipulation

T
ransport properties

of nanostructures
&

Kondo effect

Low temperature STM addapted
for single atom precision.

2
software packages have
been developed
:




“SNEG” calculate
s

in the
framework of the 2nd
quantization formalism.




“NRG Ljubljana”

efficient implementation of
the numerical
renormalization group
technique.


Applications to
clusters of
impurities (quantum dots)



1 PRL, 6 PRB
s

Atoms & Surfaces 2008



Spintronics using NMR
-
LT STM

J
oint

programme of developing a combined
NMR
-
L
ow

temperaqture

STM instrument

Manipulation and spectroscopy of
single/cluster atom magnetic impurities


E
ffects of single atom magnetic
impurities on the surfaces of
superconductors and magnets, the
magnetic interaction between impurity
pairs and local properties of larger
impurity clusters

will be studied.

C
hemical identification of single atoms, based
on local spin NMR measurements.

International
impact

Last 4 years



30
invited and plenary talks
at international meetings



4 organizations of
international meetings



4 memberships in international
conference boards



2 memberships in
boards of international societies



Editorial work
for European Physics Journal E



9 partnerships in
EU projects 350 000



New



Samsung
Mid
-
Career Award
of the International Liquid Crystal Society

(I. Muševič 2008)




President

of the International Liquid Crystal Society (4 years starting
July 2008
-

S. Žumer
)



3 partnerships

(JSI
-
Muševič
, FMF
-
UL
-
Žumer
, Balder
-
Pirš
)
out of 9
in
HIERARCHY ITN EU
project starting September 2008

(4 years)

-

close to
1

000 000


for Slovenian partners




Partnership

in
No. 1 ranked
proposal
to
International Human

Frontier
Science Program

(HFSP)

2008

(collab
oration
:

Leeds, Tok
y
o, Sendai,
Ljubljana

-

A. Vilfan
)

National relevance

Indirect effects:

.

Strog

research
is crucial for good university education



7 PhDs
completed (one foreign student)



9 employments
(industry 2, university 2, research 2 ,


government 2, education 1)



International
ly

competitive

research

as a
cure for brain drain



International promotion
of the country


Direct effects via stimulation and support to technological development:



direct collaboration
(Balder,
Fotona
,
Iskra

Mehanizmi
,…)



industrial projects

(
270 000

)



spin
-
off company
Balder Ltd
-

the best eye protection filters




new spin
-
off company
Nanotul

Ltd
devoted to the



commercialization of inorganic
nanotubes

Recognition of the relevance:



The
Zois

award
for outstanding achievements:
Muševič

2006;



3
Jozef

Stefan
Golden Emblem Prize
:
Žitko

08,
Svenšek

06, and
Kočevar

04







Conclusions



Synergy



of approaches: experiments, applications, simulations and theory



institutional (IJS in FMF UL): lab facilities & source of new researchers



personal (IJS
,

UL
,
UM
,

Balder, Nanotul)



international (formal and informal collaboration)




Internationally competitive research
with
leading roll
in some
segments




Priority fields:

nanotechnology, biotechnology & technology for
informatics

A

10
%

increase

in

funding

would

enable
:



postdoc

position,



redistribution

between

research

and

teaching

loads
.


This

would

enable

a

full

scale

realization

of

our

ambitious

goals
.