کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6612961 459593 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparison of electrochemical- and nuclear magnetic resonance spectroscopy methods for determination of diffusion coefficients in gel environment
ترجمه فارسی عنوان
مقایسه روش های طیف سنجی رزونانس مغناطیسی الکتروشیمیایی و هسته ای برای تعیین ضریب انتشار در محیط ژل
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
Two advanced methods: one based on chronoamperometry in solution of any ionic strength and the second one related to nuclear magnetic resonance spectroscopy (NMR) were used to determine the difusion coefficients of the selected species in complex polymeric gels. For this purpose a series of polyacrylamide gels with different content of monomer and crosslinker were synthesized. Rod shaped samples of polymers were swelled with solutions of either 1,1'-ferrocenedimethanol, or 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt or cis-dichlorobis(2,2′-bipyridine) ruthenium(II) in D2O. These compounds were good probes for examining the transport in the gel medium due to electrochemical reaction and well-defined signals in 1H NMR spectroscopy. The values of diffusion coefficients obtained by both methods were compared and the limitations of the methods were discussed. The measurements were done at three temperatures: 25, 35 and 45 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 144, 20 October 2014, Pages 228-234
نویسندگان
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