000197004 001__ 197004
000197004 005__ 20181203023433.0
000197004 0247_ $$2doi$$a10.1021/ja4120117
000197004 02470 $$2ISI$$a000331493700056
000197004 037__ $$aARTICLE
000197004 245__ $$aSpecific Ion Effects in Amphiphile Hydration and Interface Stabilization
000197004 269__ $$a2014
000197004 260__ $$aWashington$$bAmer Chemical Soc$$c2014
000197004 300__ $$a8
000197004 336__ $$aJournal Articles
000197004 520__ $$aSpecific ion effects can influence many processes in aqueous solutions: protein folding, enzyme activity, self-assembly, and interface stabilization. Ionic amphiphiles are known to stabilize the oil/water interface, presumably by dipping their hydrophobic tails into the oil phase while sticking their hydrophilic head groups in water. However, we find that anionic and cationic amphiphiles adopt strikingly different structures at liquid hydrophobic/water interfaces, linked to the different specific interactions between water and the amphiphile head groups, both at the interface and in the bulk. Vibrational sum frequency scattering measurements show that dodecylsulfate (DS–) ions do not detectably perturb the oil phase while dodecyltrimethylammonium (DTA+) ions do. Raman solvation shell spectroscopy and second harmonic scattering (SHS) show that the respective hydration-shells and the interfacial water structure are also very different. Our work suggests that specific interactions with water play a key role in driving the anionic head group toward the water phase and the cationic head group toward the oil phase, thus also implying a quite different surface stabilization mechanism.
000197004 700__ $$0247165$$aScheu, Rüdiger$$g220447
000197004 700__ $$0247161$$aChen, Yixing$$g191885
000197004 700__ $$aB. de Aguiar, Hilton
000197004 700__ $$aM. Rankin, Blake
000197004 700__ $$aBen-Amotz, Dor
000197004 700__ $$0247147$$aRoke, Sylvie$$g209207
000197004 773__ $$j136$$k5$$q2040–2047$$tJournal of the American Chemical Society
000197004 909C0 $$0252471$$pLBP$$xU12398
000197004 909CO $$ooai:infoscience.tind.io:197004$$pSTI$$particle
000197004 917Z8 $$x229696
000197004 937__ $$aEPFL-ARTICLE-197004
000197004 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000197004 980__ $$aARTICLE