Permeability and diffusivity for water transport through hydrogel membranes
Permeability and diffusivity for water transport through hydrogel membranes
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DOI：
10.1016/s0376-7388(02)00546-x
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发表时间：
2003-04-01
影响因子：
9.5
通讯作者：
Radke, CJ
中科院分区：
文献类型：
--
作者：
Hoch, G;Chauhan, A;Radke, CJ
通过软性接触镜的水输送对它们在人眼上的行为很重要。我们第一次报道了梯度驱动的水通过HEMA水凝胶膜的扩散速率，这是商业软性接触镜的原型。水从膜的一个表面蒸发到已知相对湿度的空气中，并且在另一个膜表面处的储水器的重量损失被及时跟踪。典型的水渗透率为约1-5 cm/s，随着膜的饱和水含量而增加。二元Fickian扩散系数接近10（-7）cm（2）/s。本文还根据Flory-Maxwell理论计算了二元Stefan-Maxwell扩散系数。Stefan-Maxwell扩散系数是有用的，因为一般来说，它们对浓度的依赖性较小，并且它们可以容易地并入通过膜的多组分传输中。二元Fickian和Stefan-Maxwell扩散系数都随着单个透镜材料的初始水含量而有所增加。(C)2002 Elsevier Science B. V.保留所有权利。
Water transport through soft contact lenses is important to their behavior on the human eye. For the first time, we report gradient-driven diffusion rates of water through HEMA hydrogel membranes prototypical of commercial soft contact lenses. Water is evaporated from one surface of the membrane into known relative humidity air, and the weight loss of a water reservoir at the other membrane surface is followed in time. Typical water permeabilities are around 1-5 cm/s, increasing with the saturated water content of the membrane. Binary Fickian diffusion coefficients are near 10(-7) cm(2)/s. We also gamer binary Stefan-Maxwell diffusion coefficients based on Flory-Rehner theory for polymer solutions. Stefan-Maxwell diffusion coefficients are useful because, in general, they depend less strongly on concentration, and they can be readily incorporated into multicomponent transport though membranes. Both the binary Fickian and Stefan-Maxwell diffusion coefficients increase somewhat with the initial water content of the individual lens materials. (C) 2002 Elsevier Science B.V. All rights reserved.