TY  - JOUR
AU  - Lipfert, Frederik
AU  - Holderer, Olaf
AU  - Frielinghaus, Henrich
AU  - Appavou, Marie-Sousai
AU  - Do, Changwoo
AU  - Ohl, Michael
AU  - Richter, Dieter
TI  - Long wavelength undulations dominate dynamics in large surfactant membrane patches
JO  - Nanoscale
VL  - 7
IS  - 6
SN  - 2040-3372
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2015-00517
SP  - 2578-2586
PY  - 2015
AB  - By exposing microemulsions to small (80 nm diameter) and large (500 nm) disk shaped clay particles we were able to show the presence of long wavelength undulations that only occur for large membrane patches. A combination of small angle neutron scattering (SANS) and neutron spin echo (NSE) experiments have been applied to study microemulsions. These, consisting of D2O, d-decane and the surfactant C10E4, were used in connection with Laponite (small) and Nanofil (large) clay. To our knowledge our experiments show for the first time that the clay platelets induce lamellar ordering adjacent to the clay discs in the otherwise bicontinuous microemulsion. This is due to the fact that in purely structural investigations, radial averaging smears out the signature of the lamellar phase. For thermodynamically fluctuating membranes near interfaces the theory of Seifert predicts a cross-over of the dispersion relationship from k2 to a k3-dependence. With the correlation length of the membrane patches being confined by the dimension of the clay platelets we were able to show that this in fact takes place but is only present for the larger Nanofil particles.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000349472300050
DO  - DOI:10.1039/C4NR06278G
UR  - https://juser.fz-juelich.de/record/186442
ER  -