Poly(ethylene oxide) adsorption onto chemically etched silicates by Brewster angle reflectivity
Poly(ethylene oxide) adsorption onto chemically etched silicates by Brewster angle reflectivity
复制标题
DOI：
10.1016/s0927-7757(97)00218-5
复制
发表时间：
1998-04-15
影响因子：
5.2
通讯作者：
Santore, MM
中科院分区：
文献类型：
--
作者：
Fu, ZG;Santore, MM
描述了一种近布鲁斯特光学反射率测量的新方法，实现了内反射光学和扫描角度功能。然后采用该方法表征钠钙玻璃上的化学蚀刻层，并研究钠钙玻璃二氧化硅表面上水溶液中聚环氧乙烷（PEO）的吸附。几种窄分子量 PEO 样品的吸附等温线表明，等温线的平台延伸至稀释浓度，至少低至 0.01 ppm。吸附动力学测量揭示了传输限制行为并有助于确定 PEG 的自由溶液扩散系数。扩散率结果与文献非常一致。 (C) 1998 Elsevier Science B.V.
A new approach to near-Brewster optical reflectivity measurements is described, implementing internal reflection optics and scanning angle capabilities. The method is then employed to characterize chemically etched layers on soda-lime glass, and study poly(ethylene oxide) (PEO) adsorption from aqueous solution on the silica surface of soda-lime glass. Adsorption isotherms for several narrow molecular weight PEO samples demonstrate that the plateau of the isotherm extends to dilute concentrations, at least as low as 0.01 ppm. Adsorption kinetic measurements revealed transport-limited behavior and facilitated a determination of the free solution diffusion coefficient of PEG. Diffusivity results were in excellent agreement with the literature. (C) 1998 Elsevier Science B.V.