کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675598 | 1454101 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of different ureas on aggregational properties of aqueous surfactant systems
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Analysis of a variety of surfactant aggregation processes (monomer-to-micelle, spherical micelle-to-rod shaped micelle - s â r - transition, micellar growth and clouding phenomenon) in aqueous ureas or thioureas presented here shows a different picture that differs from the earlier literature reports (i.e., urea postpones the surfactant aggregation). Evidence has been collected on the basis of critical micelle concentration (cmc, obtained from conductometry), [1-pentanol] needed for s â r transition (obtained from viscometry), aggregation number (obtained from small angle neutron scattering) and cloud point (CP) measurements. All of these effects are attributed to urea-assisted aggregation up to certain concentration, which depends upon the nature and presence of number of methylene groups in a particular urea. The results are explained on the basis of influence of the additive on solvent water, adsorption on headgroup and hydrocarbon tail and size of the additive. The results may find application in understanding the mechanism of protein denaturation/renaturation by the presence of different additives.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 268, Issues 1â3, 31 October 2005, Pages 45-51
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 268, Issues 1â3, 31 October 2005, Pages 45-51
نویسندگان
Sanjeev Kumar, Ziya Ahmad Khan, Nahid Parveen, Kabir-ud-Din Kabir-ud-Din,