کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675817 | 1454107 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of temperature on the micellar properties of polyoxyethylene glycol ethers and twin tail alkylammonium surfactants
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The pyrene fluorescence (I1/I3) and conductivity (κ) measurements of polyoxyethylene glycols ethers, such as C10E8, C12E4, C14E8, and alkylammonium cationic surfactants consisting of twin hydrophobic tails, such as 12-0-12, 12-2-12, and 14-2-14 have been carried out at different temperatures in the range of 283-313 K. The critical micelle concentration (cmc) of C10E8 shows a small decrease with an increase in temperature, while that of rest of the surfactants has relatively much less dependence on the temperature variation. The aggregation number of C10E8 and all the cationic surfactants slightly increases with an increase in the temperature. The excimer formation evaluated in the micellar solution of all these surfactants increases with an increase in temperature as well as increase in the hydrophobicities of both categories of surfactants. The evaluation of thermodynamic parameters reveals that greater spontaneity is achieved upon an increase in temperature as well as hydrophobicity. The micelles of non-ionic surfactants are more hydrophobic than those of cationic surfactants of comparable hydrophobicities despite the presence of twin hydrophobic tails in the category of surfactants.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 262, Issues 1â3, 15 July 2005, Pages 168-174
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 262, Issues 1â3, 15 July 2005, Pages 168-174
نویسندگان
Mandeep Singh Bakshi, Aman Kaura, Rakesh Kumar Mahajan,