Transcript Descarrega presentació

*Please read notes (in English and Catalan) while
reviewing this file
Recerca en electrohidrodinamica i nano-fluidica*
Joan Rosell
FeT group; DEQ; ETSEQ
>> Electro-hydrodynamic cone-jets
Liquid
flow
Micro-jet
Capillary
tube held
at high
voltage
Taylor
cone
(liquid
meniscus)
Electrospray
“…the diameter is
less than 3 nm”
close-up of cone-jet tip
0.1mM LiCl in ethylene glycol
100 nm
G. Benassayag, P. Sudraud, B. Jouffrey,
Ultramicroscopy 16: 1-8, 1985
( Fdez.de la Mora et al,
J. Fluid Mech 260:155-184, 1994 )
Steady cone-jet
Coulomb explosion
Volatile
spray
Gomez and Tang, Phys Fluids 6: 404-414, 1994
Cytochrome C by ESI-MS
J. B. Fenn, M. Mann, C. K. Meng. S. F. Wong, C. M. Whitehouse,
"Electrospray Ionization for Mass Spectrometry of Large Biomolecules,"
Science 246, 64 (1989).
>> Motion studies of electrified drops - results summary
Time
(1/30 s)
E lectr ic
cond u cti vit y,
ž -1 m -1
V iscos it y,
K g/ m ·s
G lycerol
1.49
2.0x10
-6
1/30
5% w t PE G–5 M in
benzy l a lcoho l
> glyc er ol
5.5x10
-6
1/30
1.5 % w t P E G–.6 M
in benzy l a lcoho l
< bu t s im il ar
to glyc er ol
5.3x10
-6
- 1/10
End plate
Oscilloscope
Droplet
Sealed
capillary
Time
(1/10 s)
T im e b et w ee n
fr am es,
s
So luti on
H.V.power
supply
--Courtesy of D. Zhan (Gary E. Wnek)--
Electrospinning
Syringe Needle
Syringe Pump
HVDC
High voltage DC supply
Rotating and Translating
PVA
EVOH - poly(ethylene-co-vinyl alcohol)
--Courtesy of D. Zhan (Gary E. Wnek)--
A v e ra g e F ib e r D ia m e te r, M ic ro n s
8
7
6
5
4
3
2
1
0
0
5
10
15
20
C o n c e n tra tio n (w /v % )
Fibroblast cells interacting with the EVOH mat after 7 days in culture.
Kenawy et al., Biomaterials, 24, 907-913 (2003)
25
>> General scope - ICREA proposal
•
Development of aerosol techniques for the generation of nanostructured materials, with emphasis on EHD micro-flows.
•
Nano-structured fibrous materials by electro-spinning (ESP)
•
Colloid thrusters for micro-satellites
•
Electro-hydrodynamics, Electro-hydrodynamic instability of
liquids, Rayleigh breakup of droplets, Electrospray ion formation
>> Marie Curie Int’l Grant
Nano-electro-hydrodynamic flows generating droplets
–
–
–
–
Projecte europeu
En vies de co-finançament
Inicia la recerca a Catalunya en aquest camp
Mètodes:
• experimentals (mesures de ogtes) COMBINATS AMB la computació
d’aquests “nano-fluxos” invisibles
Investigadors
Joan Rosell, (PI), investigador ICREA
Joan Herrero, professor titular
Dolors Puigjaner; professora titular
Francesc Giralt, catedràtic
Dolors Salvatierra, investigadora Ramon y Cajal
Sergi Paredes, Becari