کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9684916 | 1456217 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observation of the solute transport in the permeation through hydrogel membranes by using FTIR-microscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Using the techniques of FTIR-microscopy and cryomicrotomy, the diffusion behavior of a model solute, 4-cyanophenol, through PHEMA hydrogel membranes was observed. In a side-by-side membrane permeation study, the experiment was stopped before or when the steady state was achieved. The membrane was removed from the experimental device, freeze-dried, and sectioned using a cryomicrotome. The solute concentration profile across the membrane could be determined by an FTIR-microscope. Based on Fick's law and the solution-diffusion model, the diffusion coefficient of the solute in a membrane permeation study can be determined from the pseudo-steady state permeation rate, time-lag method, and the concentration profiles within the membrane in the transient and pseudo-steady states. The results showed that the diffusion coefficients determined by different methods were not the same and distributed from 8.9Â ÃÂ 10â9 to 1.7Â ÃÂ 10â7Â cm2/s. The variation in diffusion coefficients was most likely due to the strong interaction between 4-cyanophenol and PHEMA. Some portion of absorbed 4-cyanophenol was immobilized on the polymer chains or trapped by the networks so that it was not able to diffuse. As a result, the diffusion coefficients obtained from different methods may represent different physical meanings and need a careful justification.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 253, Issues 1â2, 5 May 2005, Pages 191-198
Journal: Journal of Membrane Science - Volume 253, Issues 1â2, 5 May 2005, Pages 191-198
نویسندگان
Mei-Ling Cheng, Yi-Ming Sun,