%0 Journal Article
%A Maccarrone, Simona
%A Allgaier, J.
%A Frielinghaus, Henrich
%A Richter, Dieter
%T Anchoring vs Bridging: New Findings on Polymer Additives in Bicontinuous Microemulsions
%J Langmuir
%V 30
%N 6
%@ 1520-5827
%C Washington, DC
%I ACS Publ.
%M FZJ-2014-01273
%P 1500-1505
%D 2014
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000331774400003
%R 10.1021/la404354w
%U https://juser.fz-juelich.de/record/151285