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Adsorption and depletion of polyelectrolytes in charged cylindrical system within self-consistent field theory
Man, Xingkun1; Yang, Shuang1; Yan, Dadong1; Shi, An-Chang2
2008-07-22
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:14Pages:5451-5456
AbstractSelf-consistent field theory (SCFT) is presented to study the adsorption of flexible polyelectrolytes (PE) onto uniformly oppositely charged cylinders. We focus on the curvature effect of adsorbing surface on the adsorption-depletion phase-transition-like behavior. Numerical solutions for SCFT functions are derived. In terms of the scaling expression (C-salt* similar to p(alpha)sigma(beta)) of the critical quantities, i.e., the salt concentration C-salt*, the charge fraction p of PE chain and the area density of surface charge a, at the adsorption-depletion transition point, we divide the whole curvature dimension into two regimes, i.e., the planar regime and the cylindrical regime. In particular, we have numerically determined the crossover point of the two regimes at which the cylinder radius r(0) approximately equates to 2 times the gyration radius R-g of PE chain, or, r(0) similar to 2R(g). In the planar regime (r(0) > 2Rg), the scaling expression is invariable with surface curvature and is reduced to the planar case, or C-salt* similar to (p sigma)(2/3). In the cylindrical regime (r(0) < 2R(g)), the exponents in the scaling expression increase as r(0) decreases and - C-salt* similar to p(0.78)sigma(0.86) for a large surface curvature r(0) = 0.1R(g). Moreover, we find a critical line for the dependence of the critical radius of cylinder on the salt concentration, which separates the adsorption and depletion states. The theoretical results are in good agreement with the Monte Carlo simulations and the experimental results.
DOI10.1021/ma8003482
Indexed BySCI
Language英语
WOS IDWOS:000257665900051
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63896
Collection中国科学院化学研究所
Corresponding AuthorYan, Dadong
Affiliation1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, BNLMS, Beijing 100080, Peoples R China
2.McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
Recommended Citation
GB/T 7714
Man, Xingkun,Yang, Shuang,Yan, Dadong,et al. Adsorption and depletion of polyelectrolytes in charged cylindrical system within self-consistent field theory[J]. MACROMOLECULES,2008,41(14):5451-5456.
APA Man, Xingkun,Yang, Shuang,Yan, Dadong,&Shi, An-Chang.(2008).Adsorption and depletion of polyelectrolytes in charged cylindrical system within self-consistent field theory.MACROMOLECULES,41(14),5451-5456.
MLA Man, Xingkun,et al."Adsorption and depletion of polyelectrolytes in charged cylindrical system within self-consistent field theory".MACROMOLECULES 41.14(2008):5451-5456.
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