کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
595896 | 1454026 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
pH-dependent aggregation of citrate-capped Au nanoparticles induced by Cu2+ ions: The competition effect of hydroxyl groups with the carboxyl groups
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The citrate-capped Au nanoparticles were found to undergo pH-dependent aggregation induced by Cu2+ ions. At low pH value (8.9), the Au nanoparticles aggregated into fractal-like structure induced by the coordination interactions between the carboxyl groups of citrate ligands and Cu2+ ions. At high pH value (10.1), the Au nanoparticles aggregated into close-packed structure attributed to the increased concentration of hydroxyl groups. The coordination interactions between the metal ions and the ligands were suppressed as a result of the competition effect of the hydroxyl groups with the carboxyl groups. The aggregation process was identified to be dominated by the cluster-cluster mechanism at the low pH value and the particle-cluster mechanism at the high pH value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 346, Issues 1â3, 20 August 2009, Pages 216-220
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 346, Issues 1â3, 20 August 2009, Pages 216-220
نویسندگان
Lin Jiang, Jian Guan, Lili Zhao, Jun Li, Wensheng Yang,