کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
598050 | 879563 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dielectric relaxation spectroscopy of macroporous IER beads suspensions dispersed in primary alcohols and water-ethanol mixtures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Dielectric relaxation spectroscopy of macroporous IER beads suspensions dispersed in primary alcohols and water-ethanol mixtures Dielectric relaxation spectroscopy of macroporous IER beads suspensions dispersed in primary alcohols and water-ethanol mixtures](/preview/png/598050.png)
چکیده انگلیسی
Dielectric measurements were first carried out on suspensions of ion-exchange resin beads dispersed in primary alcohols and water-ethanol mixtures in the frequency range 40Â Hz-110Â MHz. Due to the large bead radius, only Maxwell-Wagner (M-W) dielectric relaxations were observed. Regular dielectric behaviors were observed and phase parameters concerning constituent phases' properties were determined through dielectric analysis, which revealed that the properties and the dispersing state of the bead are strongly dependent on the properties of dispersion medium. It is also found that dry beads cannot be completely soaked by alcohols with long aliphatic chain, and that suspension in water-rich mixture has similar dielectric behavior as in pure water due to the mixture's molecular construction. Then the dielectric behaviors of the following suspensions were measured as a function of time: suspensions of beads that have been equilibrated with water/ethanol redispersed in ethanol/water. The dielectric behaviors showed remarkable time dependency, characterized by distinct transitions on the curves of time dependent relaxation parameters. Based on the above understandings, the time dependent dielectric behaviors were analyzed in detail. It is showed that the time dependency directly reflected such processes as ion diffusion, solvent diffusion and solvent uptake that the systems undergo.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 292, Issue 1, 5 January 2007, Pages 42-50
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 292, Issue 1, 5 January 2007, Pages 42-50
نویسندگان
Zhen Chen, Kong-Shuang Zhao,