کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
611714 880682 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interactions between bottle-brush polyelectrolyte layers: Effects of ionic strength and oppositely charged surfactant
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Interactions between bottle-brush polyelectrolyte layers: Effects of ionic strength and oppositely charged surfactant
چکیده انگلیسی

Interactions between cationic bottle-brush polyelectrolyte layers adsorbed on mica across salt and oppositely charged surfactant solutions were investigated with the interferometric surface force apparatus, and the results were compared with what is known for similarly charged linear polyelectrolytes. Ellipsometric measurements demonstrated that the bottle-brush polyelectrolytes, which contain 45 units long poly(ethylene oxide) side chains, are more readily desorbed than linear equivalents when the ionic strength of the solution is increased. It is argued that this is due to the steric repulsion between the poly(ethylene oxide) side chains that reduces the surface affinity. The preadsorbed bottle-brush polyelectrolyte layers were also exposed to sodium dodecyl sulfate (SDS) solutions. It was found that the presence of SDS affected the force profiles less than observed for similarly charged linear polyelectrolytes. This observation was attributed to excluded volume constraints imposed by the poly(ethylene oxide) side chains that reduces the accessibility of the charged polyelectrolyte segments and counteracts formation of large aggregates within the layer.

The protective side-chains of bottle-brush polyelectrolytes increase the stability of the formed polymer layers, in solutions containing oppositely charged surfactants.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 323, Issue 1, 1 July 2008, Pages 191–202
نویسندگان
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