TY  - JOUR
AU  - Kerscher, Michael
AU  - Lipfert, Frederik
AU  - Frielinghaus, Henrich
TI  - Exploring Hidden Local Ordering in Microemulsions with a Weak Directive Second Order Parameter
JO  - Chemistry Africa
VL  - 3
SN  - 2522-5766
CY  - Cham
PB  - Springer International Publishing
M1  - FZJ-2020-01375
SP  - 703-709
PY  - 2020
AB  - So far, the near-surface ordering of microemulsions was focused on lamellar ordering while the bulk microemulsion was bicontinuous. In a series of different non-ionic surfactants the near-surface ordering of microemulsions at a hydrophilic silicon surface was studied using grazing incidence small angle neutron scattering. For the surfactant C8E3, most likely a gyroid structure was found at the solid–liquid interface, while the more efficient surfactants find lamellar ordering up to lamellar capillary condensation. The ranges for near-surface ordering are deeper than the bulk correlation lengths. These findings point towards theories that use directional order parameters that would lead to deeper near-surface ordering than simple theories with a single scalar order parameter would predict. Rheology experiments display high viscosities at very low shear rates and, therefore, support the existence of a directional order parameter.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000705288300017
DO  - DOI:10.1007/s42250-020-00126-7
UR  - https://juser.fz-juelich.de/record/874327
ER  -