کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
610871 880661 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self-assembly of Nafion molecules onto silica nanoparticles formed in situ through sol–gel process
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Self-assembly of Nafion molecules onto silica nanoparticles formed in situ through sol–gel process
چکیده انگلیسی

Self-assembly of Nafion onto in situ formed silica nanoparticles in ethylene glycol–water mixture solvent has been investigated in this study. It was found that the formation of silica nanoparticles depends on the concentration of Nafion in dispersions. At relatively low concentration, 0.8% in weight in this case, the existing Nafion is not sufficient to prevent further growth of the initially formed silica nanoparticles, leading to large aggregates of silica particles. When the concentration of Nafion increased to 2% in weight, self-assembled Nafion layer on the surface stabilizes the initial formed silica nanoparticles and silica particles with average diameters of 4.2±0.5 nm4.2±0.5 nm were found to be uniformly distributed in the dispersion. With further increasing the concentration of Nafion, the number of Nafion aggregates increases and silica nanoparticles were mainly formed inside the entangled Nafion chains, resulting in an observation of clusters of silica nanoparticles.

In situ generation of silica nanoparticles in Nafion dispersion with different concentrations: (a) low concentration, (b) medium concentration, and (c) high concentration.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 326, Issue 1, 1 October 2008, Pages 55–60
نویسندگان
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