کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
598101 1454084 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Early steps of the film growth mechanism in self-assembled multilayers of PAH and PSS on silica: Polymer uptake, charge balance and AFM analysis
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Early steps of the film growth mechanism in self-assembled multilayers of PAH and PSS on silica: Polymer uptake, charge balance and AFM analysis
چکیده انگلیسی

This study investigates the growth of self-assembled polyelectrolyte films with strong polyacid (poly(styrene sulfonate), PSS and a weak polybase (poly(allylamine hydrochloride), PAH at pH 9. Addressing the deposit of the first 3 bilayers, we focus on the successive adsorption isotherms, the effect of maintaining a constant pH, the charge balance and the counterions co-adsorption in the successive steps. We also present stepwise AFM images of the film grown on a silica wafer, showing a very heterogeneous morphology with bumps and valleys, totally unlike the expected regular superposition of bi-dimensional polymer layers. Finally, a sketch of the growth mechanism is proposed, featuring most of the experimental observations in the study.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 288, Issues 1–3, 5 October 2006, Pages 26–35
نویسندگان
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