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Specific ion effects induced by mono-valent salts in like charged aggregates in water
Huang, ND; Tao, JJ; 刘俊; Liu, J; Wei, SH; Li, LB; Wu, ZY
2014
发表期刊SOFT MATTER
卷号10期号:24页码:4236-4240
摘要While salt mediated association between similarly charged polyelectrolytes occurs in a broad range of biological and colloidal systems, the effects of mono-valent salts remains little known experimentally. In this communication we systematically study influences of assorted mono-valent salts on structures of and interactions in two dimensional ordered bundles of charged fibrils assembled in water using Small Angle X-ray Scattering (SAXS). By quantitatively analyzing the scattering peak features, we discern two competing effects with opposite influences due to partitioning of salts in the aqueous complex. While electrostatic effects from salts residing between the fibrils suppress attraction between fibrils and expand the bundles, it is compensated by external osmotic pressure from peripheral salts in the aqueous media. The balance between the two effects varies for different salts and gives rise to ion-specific equilibrium behavior as well as structure of ordered bundles in salty water. The specific ions effects in like charged aggregates can be attributed to preferential distribution of ions inside or outside the bundles, correlated to the ranking of ions in Hofmeister series for macromolecules. Unlike conventional studies on Hofmeister effects by thermodynamic measurements relying on modeling for data interpretation, our study is based directly on structural analysis and is model-insensitive.
学科领域Chemistry; Materials Science; Physics; Polymer Science
DOI10.1039/c3sm52925h
收录类别SCI
WOS记录号WOS:000337112600002
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225374
专题多学科研究中心
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Huang, ND,Tao, JJ,刘俊; Liu, J,et al. Specific ion effects induced by mono-valent salts in like charged aggregates in water[J]. SOFT MATTER,2014,10(24):4236-4240.
APA Huang, ND,Tao, JJ,刘俊; Liu, J,Wei, SH,Li, LB,&Wu, ZY.(2014).Specific ion effects induced by mono-valent salts in like charged aggregates in water.SOFT MATTER,10(24),4236-4240.
MLA Huang, ND,et al."Specific ion effects induced by mono-valent salts in like charged aggregates in water".SOFT MATTER 10.24(2014):4236-4240.
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