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题名: Single chains of strong polyelectrolytes in aqueous solutions at extreme dilution: Conformation and counterion distribution
作者: Xu, Guofeng1, 2; Luo, Shuangjiang1, 2; Yang, Qingbo1, 2; Yang, Jingfa1; Zhao, Jiang1
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2016-10-14
卷: 145, 期:14
收录类别: SCI
英文摘要: The molecular conformation of two typical polyelectrolytes, sodium polystyrene sulfonate (NaPSS) and quarternized poly-4-vinylpyridine (QP4VP), was studied in aqueous solutions without salt addition at the single molecular level. By fluorescence correlation spectroscopy, the hydrodynamic radius (Rh) of NaPSS and QP4VP with the molecular weight ranging more than one order of magnitude was measured. The scaling analysis of Rh exhibits scaling exponent of 0.70 and 0.86 for NaPSS and QP4VP in solutions without added salts, respectively, showing the conformation is much more expanded than random coil. Numerical fittings using the model of diffusion of a rod molecule agree with the data well, indicating that the polyelectrolyte chains take the rod-like conformation under the condition without salt addition. Further investigations by determining the electric potential of single PSS- chains using the photon counting histogram technique demonstrate the enhanced counterion adsorption to the charged chain at higher molecular weight. Published by AIP Publishing.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35162
Appears in Collections:高分子物理与化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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