Numerical study of the interplay of monomer-surface electrostatic and non-electrostatic interactions in the adsorption of weak polyelectrolytes on oppositely charged surfaces

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• 作者：Hai-ming Li ; Yu-wei Chen ; Yue-jin Zhu…
• 关键词：Polyelectrolyte adsorption ; Self ; consistent field theory ; Non ; electrostatic interaction
• 刊名：Chinese Journal of Polymer Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：34
• 期：5
• 页码：552-562
• 全文大小：1,423 KB
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• 作者单位：Hai-ming Li (1)
  Yu-wei Chen (1)
  Yue-jin Zhu (1)
  Chao-hui Tong 童朝晖 (1)
  
  1. Department of Physics, Ningbo University, Ningbo, 315211, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

The adsorption of weak polybase on oppositely charged planar surfaces has been investigated numerically by using the self-consistent field theory (SCFT). Particular attention was paid to the interplay of monomer-surface electrostatic and non-electrostatic interactions in the adsorption behaviors of weak polybase. In this study, the strength of monomer-surface non-electrostatic interactions was set to be no more than the thermal energy k _B T. It was found from the numerical study that in the regime of low surface charge density of the substrate and low pH or high bulk degree of ionization, both the screening-enhanced and screening-reduced salt effects emerge. On the contrary, in the opposite regime, only the screening-reduced salt effect was observed. Moreover, the overall charge neutrality inside the adsorption layer was analyzed. The underlying mechanism governing the adsorption behaviors of weak polybase on oppositely charged surfaces was elucidated.