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@INPROCEEDINGS{Gvaramia:872674,
author = {Gvaramia, Manuchar and Mangiapia, Gaetano and Falus, Peter
and Ohl, Michael and Holderer, Olaf and Frielinghaus,
Henrich},
title = {{C}apillary condensation in microemulsions},
reportid = {FZJ-2020-00165},
year = {2019},
abstract = {Microemulsions are thermodynamically stable mixtures of oil
and water that are mediated by the surfactant. Locally,
there are oil and water domains that are observable by
scattering experiments that are separated by the surfactant
film. The domain sizes are usually a few nanometers and
display shapes from spherical droplets over elongated
droplets to the bicontinuous sponge phase. In the following
we restrict ourselves to the bicontinuous microemulsion.
When exposing the microemulsion to hydrophilic surfaces, a
lamellar order is locally induced next to the interface.
From spectroscopic measurements, we know that the membrane
fluctuations in microemulsions are faster in the lamellar
state. This is connected to the lubrication effect, because
the lamellae can slide off easier and the motions are
faster. In spectroscopic measurements with hydrophilic clay
particles, we could show, that the platelet diameter causes
a cutoff of the undulation modes, and larger platelets cause
a better order with longer wavelength modes. The capillary
condensation in bicontinuous microemulsions is expected to
take place when two parallel surfaces are narrowed that
result in a completely lamellar microemulsion (Figure). So
far, all experiments stayed at relatively low clay
concentrations, when the system is still liquid. The
lamellar fraction in microemulsions with $1\%$ clay is
around $25\%$ in volume. We now tried to observe the
capillary condensation with increasing clay concentration
using small angle neutron scattering (SANS) and neutron spin
echo (NSE) spectroscopy.},
month = {Feb},
date = {2019-02-13},
organization = {MML Workshop at HZDR/Dresden, Dresden
(Germany), 13 Feb 2019 - 15 Feb 2019},
subtyp = {Outreach},
cin = {JCNS-FRM-II / JCNS-1 / MLZ},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15) / 6215 - Soft Matter,
Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
G:(DE-HGF)POF3-6215},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/872674},
}