Slezak Andrzej, Jasik-Slezak Jolanta, Dworecki Kazimierz
Czestochowa University of Technology, Czestochowa.
Polim Med. 2003;33(4):43-64.
The results of studies of influence of concentration boundary layers on passive diffusive transport in a double-membrane osmo-diffusive cell, containing a series of two (Ml and M(r)) vertically positioned, flat, microporous and symmetric polymer membranes (Nephrophane and Cellulose IMP-1) are presented in this paper. The membranes separated three compartments (l, m, r) containing binary, heterogeneous and non-ionic solutions (aqueous solutions of glucose or ethanol) or ternary non-electrolyte solutions (glucose solutions in 0.75 mol.l-1 solution of ethanol or ethanol solutions in 0.1 mol.l-1 aqueous solution of glucose). Solution concentrations fulfilled the condition C(k)l > C(k)m > C(k)r. The intermembrane compartment (m) was an infinitesimal solution layer. The volume of the m compartment and the volumes of the external (l and r) compartments fulfilled the condition Vl = Vr approximately 170 Vm. The tests were performed for configurations A and B of a double-membrane osmo-diffusive cell. In configuration A, the solution was located behind the M(r) membrane, and water was placed behind the Ml membrane, while in configuration B this sequence was reversed. The results obtained during experiment were interpreted in the categories of convective instability, which increased the value of diffusive permeability coefficient of the system: concentration boundary layer/membrane/concentration boundary layer.
本文介绍了在双膜渗透扩散池中，浓度边界层对被动扩散传输影响的研究结果。该双膜渗透扩散池包含一系列两个（Ml和M(r)）垂直放置的、扁平的、微孔且对称的聚合物膜（Nephrophane和纤维素IMP-1）。这些膜分隔了三个隔室（l、m、r），隔室中含有二元、非均相且非离子溶液（葡萄糖或乙醇的水溶液）或三元非电解质溶液（在0.75 mol·l-1乙醇溶液中的葡萄糖溶液或在0.1 mol·l-1葡萄糖水溶液中的乙醇溶液）。溶液浓度满足条件C(k)l > C(k)m > C(k)r。膜间隔室（m）是一个无限小的溶液层。m隔室的体积与外部（l和r）隔室的体积满足条件Vl = Vr ≈ 170 Vm。对双膜渗透扩散池的构型A和B进行了测试。在构型A中，溶液位于M(r)膜之后，水位于Ml膜之后，而在构型B中，该顺序相反。实验期间获得的结果按照对流不稳定性的类别进行了解释，对流不稳定性增加了系统的扩散渗透系数值：浓度边界层/膜/浓度边界层。
