Single chain contraction and re-expansion of polystyrene sulfonate: A study on its re-entrant condensation at single molecular level

被引：48

作者：

Jia, Pengxiang ^{[1
]}

Zhao, Jiang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100190, Peoples R China

来源：

JOURNAL OF CHEMICAL PHYSICS | 2009年 / 131卷 / 23期

基金：

中国国家自然科学基金;

关键词：

aggregation; dissolving; fluorescence; liquid structure; polymer electrolytes; polymer solutions; precipitation; CHARGED POLYELECTROLYTE SOLUTIONS; MULTIVALENT SALT-SOLUTIONS; ANGLE NEUTRON-SCATTERING; FLEXIBLE POLYELECTROLYTES; DNA CONDENSATION; LIGHT-SCATTERING; COLLAPSE; ION; COUNTERIONS; PRECIPITATION;

D O I：

10.1063/1.3276278

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Single chain conformation of a polyelectrolyte (polystyrene sulfonate, PSS-Na+) during its re-entrant condensation was studied by fluorescence correlation spectroscopy (FCS) with single molecule sensitivity. The contraction and re-expansion of PSS-Na+ chain were observed with the addition of counterions of different valencies. The formation of aggregation and precipitation of PSS-Na+ and its redissolution were observed in accordance with the chain contraction and re-expansion process for the PSS-Na+ chain upon the addition of trivalent La3+ ion. Chain contraction and re-expansion of the PSS-Na+ chain were also observed with the addition of monovalent Cs+ and divalent Ca2+ ions, under which condition, the re-entrant condensation was not observed. The results demonstrate that the high sensitivity of FCS can really study single PSS-Na+ chain under extremely dilute situation.

引用

页数：4

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