This title appears in the Scientific Report : 2014 

Anchoring vs Bridging: New Findings on Polymer Additives in Bicontinuous Microemulsions
Maccarrone, Simona (Corresponding author)
Allgaier, J. / Frielinghaus, Henrich / Richter, Dieter
Neutronenstreuung ; ICS-1
Neutronenstreuung ; Neutronenstreuung; JCNS-1
Langmuir, 30 (2014) 6, S. 1500-1505
Washington, DC ACS Publ. 2014
Journal Article
Soft Matter Composites
Please use the identifier: in citations.
We show for the first time the effect of telechelic polymers asadditives in bicontinuous microemulsions. We combined macroscopicobservations of the phase behavior with microscopic measurements of thestructure by small-angle neutron scattering (SANS) to recover the two elasticmoduli, κ and κ̅, namely the bending rigidity and saddle-splay modulus. Onthe basis of these results, we could classify the effect of telechelic polymersalong with confinement, expressed as the ratio of the polymer end-to-enddistance Ree and the oil−water domain size d. Their unique property to anchorat two points in the membrane (bridging) acts like a switch from antiboosterto booster of the surfactant efficiency (between low and ultralowconfinement). In the region of medium confinement, all telechelic polymersare in the bridging configuration and we have a maximum of the boostingeffect, while at high confinement, the reversed behavior is found whereanchoring and/or bridging do not play any role anymore.