کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675729 | 1454105 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of ureas and alkylureas on the sphere-to-rod transition in aqueous ionic micellar solutions
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
The effects of urea, thiourea, mono-, di-, and tetramethylurea (alkylureas) on the sphere-to-rod transition (s â r) in a typical system of 3.5% (w/v) sodium dodecylsulfate (SDS) + 0.28 M NaCl + x M 1-pentanol in aqueous solution have been investigated using viscosity and dynamic light scattering measurements. In this system, 1-pentanol at a concentration of 0.04 M, is known to promote s â r transition, whereas the presence of urea or its derivatives are found to promote/retard the transition. This effect in the structural transition is due to the increased dielectric constant of the medium and adsorption of ureas on dodecylsulfate anion (DSâ). The former effect ameliorates hydrophobic interactions, as the electrostatic repulsion would be decreased. The adsorption effect continuously increases with increase in the number of methyl group in the urea molecule, which in turn, results in increased hydration of the micelles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 203-206
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 203-206
نویسندگان
Sanjeev Kumar, Deepti Sharma, Goutam Ghosh, Kabir-ud-Din Kabir-ud-Din,