Physicochemical properties of polysaccharide coatings based on grafted multilayer assemblies
Physicochemical properties of polysaccharide coatings based on grafted multilayer assemblies
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DOI：
10.1021/la001801i
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发表时间：
2002-04-02
期刊：
影响因子：
3.9
通讯作者：
Griesser, HJ
中科院分区：
文献类型：
--
作者：
Hartley, PG;McArthur, SL;Griesser, HJ
使用等离子体聚合物夹层结合两种不同的化学接枝策略，将不同电荷密度的羧甲基葡聚糖附着到平坦的硅晶片表面。所得涂层已通过 XPS 进行分析，以验证涂层的表面覆盖率并估计其干燥厚度。动电势测量已用于确定涂层的静电特性，原子力显微镜胶体探针力测量已用于深入了解多糖链从水性环境中界面的延伸。结果表明，当在多糖附着之前将第二层富含胺的聚电解质夹层引入等离子体聚合物表面时，溶液中的多糖层厚度最大化。多糖中羧基密度的增加也被证明可以在溶液中产生更厚的聚合物层，所得表面的动电特性反映了偶联多糖的电荷密度。数据表明，存在基于多糖接枝的精细控制来调整界面的空间和静电性质的方法。
Carboxymethyldextrans of different charge densities have been attached to flat silicon wafer surfaces using plasma polymer interlayers in conjunction with two different chemical grafting strategies. The resultant coatings have been analyzed by XPS, to verify the surface coverage of the coatings and to estimate their dry thicknesses. Electrokinetic streaming potential measurement has been used to ascertain the electrostatic properties of the coatings, and atomic force microscope colloid probe force measurements have been used to provide insights into the extension of the polysaccharide chains from the interface in aqueous environments. The results demonstrate that polysaccharide layer thickness in solution is maximized when a secondary, amine-rich polyelectrolyte interlayer is introduced onto the plasma polymer surface prior to polysaccharide attachment. An increased carboxyl density in the polysaccharide has also been shown to give rise to thicker polymer layers in solution, with the electrokinetic properties of the resultant surfaces reflecting the charge density of the coupled polysaccharide. The data demonstrate that methods exist for tailoring the steric and electrostatic properties of interfaces based on the fine control of polysaccharide grafting.