Journal of Colloid and Interface Science 2010-02-01

New self-assembling systems based on bola-type pyrimidinic surfactants.

Lucia Zakharova, Victor Syakaev, Mikhail Voronin, Vyacheslav Semenov, Farida Valeeva, Alsu Ibragimova, Azat Bilalov, Rashit Giniyatullin, Shamil Latypov, Vladimir Reznik, Alexander Konovalov

文献索引：J. Colloid. Interface Sci. 342(1) , 119-27, (2010)

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摘要

New amphiphilic pyrimidinic (AP) compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions (APB) and hydrophobic tosylate anions (APT) were synthesized. Self-organization in these systems has been studied by methods of tensiometry, conductometry, potentiometry and NMR spectroscopy. The critical micelle concentrations (cmc's) of bola-type surfactants are only a little lower than those of cetyltrimethylammonium (CTA) analogues. For both pairs APB/CTAB and APT/CTAT the counterion binding is stronger for the conventional cationic surfactants as compared to 'bola' pyrimidinic surfactants. Unlike the CTAT micelles no sharp micellar growth occurs with the APT concentration. The geometry of AP compounds is assumed to be mainly responsible for the above finding. A branched molecular architecture prevents a close packing of the monomers in the bulk solution and at the interface producing a steric hindrance around the head groups.Copyright 2009 Elsevier Inc. All rights reserved.