Electroresponsive Polyelectrolyte Brushes Studied by Self-Consistent Field Theory

被引:12
作者
Okrugin, Boris M. [1 ,2 ]
Richter, Ralf P. [1 ,3 ,4 ]
Leermakers, Frans A. M. [5 ]
Neelov, Igor M. [6 ]
Zhulina, Ekaterina B. [6 ,7 ]
Borisov, Oleg V. [2 ,6 ,7 ]
机构
[1] CIC biomaGUNE, Biosurface Lab, Paseo Miramon 182, San Sebastian 20014, Spain
[2] CNRS, UMR 5254, UPPA, Inst Sci Analyt & Physicochim Environm & Mat, F-64053 Pau, France
[3] Univ Leeds, Astbury Ctr Struct Mol Biol, Sch Phys & Astron, Sch Biomed Sci,Fac Biol Sci,Fac Engn & Phys Sci, Leeds LS2 9JT, W Yorkshire, England
[4] Univ Leeds, Bragg Ctr Mat Res, Leeds LS2 9JT, W Yorkshire, England
[5] Wageningen Univ, Phys Chem & Soft Matter, NL-6703 NB Wageningen, Netherlands
[6] St Petersburg Natl Univ Informat Technol Mech & O, St Petersburg 197101, Russia
[7] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
基金
欧洲研究理事会; 欧盟地平线“2020”;
关键词
smart interfaces; polyelectrolyte brushes; self-consistent field theory; COPOLYMERS;
D O I
10.3390/polym12040898
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
End-grafting of polyelectrolyte chains to conducting substrates offers an opportunity to fabricate electro-responsive surfaces capable of changing their physical/chemical properties (adhesion, wettability) in response to applied electrical voltage. We use a self-consistent field numerical approach to compare the equilibrium properties of tethered strong and weak (pH-sensitive) polyelectrolytes to applied electrical field in both salt-free and salt-containing solutions. We demonstrate that both strong and weak polyelectrolyte brushes exhibit segregation of polyions in two populations if the surface is oppositely charged with respect to the brush. This segregation gives rise to complex patterns in the dependence of the brush thickness on salt concentration. We demonstrate that adjustable ionization of weak polyelectrolytes weakens their conformational response in terms of the dependence of brush thickness on the amplitude of the applied voltage.
引用
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页数:18
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