کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10712987 | 1025285 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
NMR study of the vapor phase contribution to diffusion in partially filled silica glasses with nanometer and micrometer pores
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: NMR study of the vapor phase contribution to diffusion in partially filled silica glasses with nanometer and micrometer pores NMR study of the vapor phase contribution to diffusion in partially filled silica glasses with nanometer and micrometer pores](/preview/png/10712987.png)
چکیده انگلیسی
The contribution of the vapor phase to molecular diffusion in porous silica glasses with nanometer (Vycor) and micrometer (VitraPor#5) pores partially filled with water (polar) or cyclohexane (nonpolar) was investigated with the aid of field-gradient NMR diffusometry. Due to the vapor phase, the effective diffusion coefficient of cyclohexane filling micrometer pores (VitraPor#5) increased up to 10 times relative to the value in bulk liquid upon reduction of the pore space filling factor. On the other hand, the effective diffusion coefficient of water first decreases and then increases when the liquid content is reduced. The dependence of the effective diffusion coefficient on the pore filling factor is strongly related to the pore dimension. A general two-phase exchange model is presented that is well accounting for all experimental diffusion features.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Magnetic Resonance Imaging - Volume 23, Issue 2, February 2005, Pages 285-289
Journal: Magnetic Resonance Imaging - Volume 23, Issue 2, February 2005, Pages 285-289
نویسندگان
Ioan Ardelean, German Farrher, Carlos Mattea, Rainer Kimmich,