Structural Transitions in Nanoparticle Assemblies Governed by Competing Nanoscale Forces

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• 作者：Rachelle M. Choueiri ; Anna Klinkova ; H茅loı ; &#776 ; se Th茅rien-Aubin ; Michael Rubinstein ; Eugenia Kumacheva
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：July 17, 2013
• 年：2013
• 卷：135
• 期：28
• 页码：10262-10265
• 全文大小：259K
• 年卷期：v.135,no.28(July 17, 2013)
• ISSN：1520-5126

文摘

Assembly of nanoscale materials from nanoparticle (NP) building blocks relies on our understanding of multiple nanoscale forces acting between NPs. These forces may compete with each other and yield distinct stimuli-responsive self-assembled nanostructures. Here, we report structural transitions between linear chains and globular assemblies of charged, polymer-stabilized gold NPs, which are governed by the competition of repulsive electrostatic forces and attractive poor solvency/hydrophobic forces. We propose a simple quantitative model and show that these transitions can be controlled by the quality of solvent, addition of a salt, and variation of the molecular weight of the polymer ligands.