摘要
An equation of diffusion for microcapsules（hollow sphere）was developed,employing the mathematicalmodel for the diffusion characteristics of solid sphere.In the proposed equation,a combination diffusion coeffi-cient was introduced as a substitute for the diffusion coefficient in the solid sphere mathematical model and ex-pressed as a function of the diffusion coefficient inside solution of hollow sphere,as well as in the polymer mem-brane.With this modified model,the diffusion coefficients of glucose in NaCS（sodium cellulose sulfate）-PDADMAC（Poly-diallyl-dimethyl-ammonium chloride）membrane and in Ca-alginate gel membrane were deter-mined.The diffusion coefficient in NaCS-PDADMAC membrane was found to be 2.12×10<sup>-11</sup>m<sup>2</sup>·s<sup>-1</sup>and thatin Ca-alginate membrane 2.62×10<sup>-10</sup>m<sup>2</sup>·s<sup>-1</sup>.
An equation of diffusion for microcapsules (hollow sphere) was developed, employing the mathematical model for the diffusion characteristics of solid sphere. In the proposed equation, a combination diffusion coefficient was introduced as a substitute for the diffusion coefficient in the solid sphere mathematical model and expressed as a function of the diffusion coefficient inside solution of hollow sphere,as well as in the polymer membrane. With this modified model, the diffusion coefficients of glucose in NaCS (sodium cellulose sulfate)-PDADMAC(Poly-diallyl-dimethyl-ammonium chloride) membrane and in Ca-alginate gel membrane were determined. The diffusion coefficient in NaCS-PDADMAC membrane was found to be 2.12×10-11 m2·s-1 and that in Ca-alginate membrane 2. 62×10-10 m2·s-1.
基金
Supported by the National Natural Science Foundation of China(No.29676069),the Foundation of the National Education committee of China and Mr.Chao Guangbiao advanced Technology Foundation of Zhejiang University.
