کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
593691 1453953 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation of Cu2O@SiO2 particles and their evolution to hollow SiO2 particles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Preparation of Cu2O@SiO2 particles and their evolution to hollow SiO2 particles
چکیده انگلیسی

This study demonstrates an environment-friendly process to synthesize hollow SiO2 particles. The preparation of Cu2O@SiO2 particles via the sol–gel process is presented for the first time. Silica coating on the Cu2O particles has been considered not possible due to the easy etching of Cu2O in an NH4OH solution. We found that diluted NH4OH solution delayed the etching of the Cu2O particles in the sol–gel process and allowed thick coating of silica. The time-dependent etching of the Cu2O core in the Cu2O@SiO2 particles generated yolk/shell particles and finally produced the hollow SiO2 particles. The etched Cu solution could be recycled to produce Cu2O particles again.

Graphical AbstractFigure optionsDownload as PowerPoint slideHighlights
► We demonstrate an environment-friendly process to synthesize hollow SiO2 particles.
► We present the preparation of Cu2O@SiO2 particles via the sol–gel process for the first time.
► Diluted NH4OH solution delayed the etching of the Cu2O particles to allow the coating of silica.
► We prepared hollow SiO2 particles with diverse shapes.
► The etched Cu solution could be recycled to produce Cu2O particles again.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 420, 5 March 2013, Pages 30–36
نویسندگان
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