کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10609306 | 984566 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction of polyelectrolytes with oppositely charged micelles studied by fluorescence and liquid chromatography
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Interaction of polyelectrolytes with oppositely charged micelles studied by fluorescence and liquid chromatography Interaction of polyelectrolytes with oppositely charged micelles studied by fluorescence and liquid chromatography](/preview/png/10609306.png)
چکیده انگلیسی
It is studied by spectrofluorimetry the association of ionized cationic micelles (cetyltrimethylammonium bromide, CTAB) with oppositely charged polyelectrolyte [sodium poly(styrenesulfonate), PSSNa]. CTAB provokes a change in the fluorescence intensity emitted by PSSNa. The investigated surfactants form micelle-like aggregates before critical micellar concentration (CMC). Two approaches (binding and partition equilibrium) are used to obtain the association constant, KA, number of CTAB molecules in a binding site, N, and apparent partition coefficient, Î. Analysis of the parameters as a function of polymer concentration and ionic strength μ is performed. The effect of μ shows an enhancement in association as μ decreases. Furthermore as CMC decreases with μ, experiments have to be performed at rather different CMCs. This causes KA and Î to increase with μ. The adsorption of polyelectrolyte on the micelle is also studied at the greatest μ using high-performance liquid chromatography (size-exclusion) for the first time, obtaining results similar to those found using spectrofluorimetry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 41, Issue 6, June 2005, Pages 1439-1452
Journal: European Polymer Journal - Volume 41, Issue 6, June 2005, Pages 1439-1452
نویسندگان
Francisco Torrens, Concepción Abad, Armando Codoñer, Rosa GarcıÌa-Lopera, AgustıÌn Campos,