کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
610318 880646 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New self-assembling systems based on bola-type pyrimidinic surfactants
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
New self-assembling systems based on bola-type pyrimidinic surfactants
چکیده انگلیسی

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.

Self-organization of new amphyphilic pyrimidinic compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions and hydrophobic tosylate anions has been studied.Figure optionsDownload high-quality image (88 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 342, Issue 1, 1 February 2010, Pages 119–127
نویسندگان
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