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题名: ea Controllable Self-Assembly of Amphiphilic Dendrimers on a Silica Surface: The Effect of Molecular Topological Structure and Salinity
作者: Zhang, Minghui1, 2; Wang, Jinben1; Zhang, Pei1
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2016-10-27
卷: 120, 期:42, 页:10990-10999
收录类别: SCI
英文摘要: The adsorption kinetics and equilibrium of amphiphilic dendrimers based on poly(amidoamine) modified with a dodecyl chain, G(n)QPANIC(12) (n represents the generation number), with different generation numbers at a silica water interface have been investigated. The effect of molecular shape with different charge characteristics on the adsorption kinetics, adsorption isotherms, and the conformation of a self-assembled layer has been elucidated. For the adsorption kinetics, two steps were observed including the adsorption of individual molecules at concentrations below the critical micelle concentration (cmc) and the predominant adsorption of aggregates above the cmc. However, the adsorption isotherm, as a function of the generation number, presented an exceptional characteristic, in which a decrease in adsorption mass with different levels occurred in a high generation of amphiphilic dendrimers, depending on the balance of hydrophobic interaction and electrostatic repulsion. Atomic force microscopy imaging showed that flattened films with pores (spacing) of various shapes and roughness of 3-4 nm were formed, of which the pores (spacing) decreased obviously as the generation number increased. The addition of electrolyte (NaBr) has a great effect on the film morphology formed by the G(3)QPAMC(12) dendrimer adsorbed at the silica water interface, showing that the film became closer with smaller pores with increased NaBr concentration.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35165
Appears in Collections:胶体、界面与化学热力学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, Key Lab Colloid Interface & Chem Thermodynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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