単一微粒子計測法によるシリカゲル微粒子内物質移動過程の研究
スポンサーリンク
概要
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Mass transfer processes in microparticle/solution systems were kinetically analyzed by a new technique combined with the microcapillary injection/manipulation and microabsorption method of a single microparticle. In situ measurements of both the sorption and desorption processes for the same single particle and the particle size dependencies of the sorption and desorption rates are indispensable for discussing the microscopic mechanisms of the intraparticle mass transfer processes. Quantitative measurements of the intraparticle mass transfer of the dyes in single silica gel microparticles were demonstrated for various pH and ionic strength (I) values using this method. The relationship between these kinetic and isotherm parameters was quantitatively discussed based on a pore diffusion model. The intraparticle mass transfer processes of three dyes in single silica gel microparticles for various pore sizes (d_p) and I values were also investigated. The observed diffusion coefficient (D_o) and the isotherm parameters were highly dependent on d_p (3〜30 nm). The relationship between D_o and d_p and the hindrance parameter could be quantitatively analyzed based on the theoretical model of the pore diffusion for the first time. The present approach would be useful to obtain information of diffusion, adsorption/desorption, complexation. and so forth, in nanometer-sized pores of microparticles.
- 2005-01-05