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| Home > Publications database > Anchoring vs Bridging: New Findings on Polymer Additives in Bicontinuous Microemulsions |
| Journal Article | FZJ-2014-01273 |
; ; ;
2014
ACS Publ.
Washington, DC
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Please use a persistent id in citations: doi:10.1021/la404354w
Abstract: 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.
Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Key Technologies (1st) ; Soft Matter, Macromolecules, Complex fluids, Biophysics (1st) ; Soft Condensed Matter (2nd)
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