کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
608865 880610 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Growth of Ag-nanoparticles using aspartic acid in aqueous solutions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Growth of Ag-nanoparticles using aspartic acid in aqueous solutions
چکیده انگلیسی

Spectrophotometric, kinetic, and transmission electron microscopic (TEM) data for the formation of Ag-nanoparticles using aspartic acid (Asp) as reductant are reported for the first time. In the formation of transparent silver sols, an alkaline medium is required. The silver nanoparticles are spherical, uniform particle size, and strongly depend on the [Asp]. The apparent rate constant decreases with [Asp] (from 4.0 to 24.0 × 10−4 mol dm−3, the rate constants decreased from 2.6 × 10−4 to 0.3 × 10−4 s−1). For a certain reaction time, i.e., 30 min, the absorbance of the silver sol first increased until it reached a maximum, and then decreased with [Asp]. Kinetic and TEM results indicate that the size of the Ag-nanoparticles depends on the [Asp]. It is proposed that the oxidation of Asp occurs by the adsorbed Ag+ ions on the surface of Ag2O particles.

Adsorbed Ag+ ions on the surface of Ag2O formed by the reaction of Ag+ ions and OH−, are reduced by the adsorbed aspartic acid.Figure optionsDownload high-quality image (43 K)Download as PowerPoint slideResearch highlights
► Alkaline solution is required to the formation of perfect transparent silver sol.
► Size and rates of silver nanoparticle formation strongly depends on the aspartic acid concentrations.
► Amino and α-carboxylate groups undergo chemical transformation.
► Aspartic acid oxidized by the adsorbed silver ions onto the surface of silver oxide.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 354, Issue 1, 1 February 2011, Pages 190–195
نویسندگان
, , , ,