کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675605 | 1454101 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamics of aggregation of Tweens in the presence of diclofenac sodium
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The effect of the addition of diclofenac sodium (DS) to the aqueous solution of non-ionic surfactants, polyoxyethylene sorbitan monolaurate, Tween-20 (T-20) and polyoxyethylene sorbitan monooleate, Tween-80 (T-80) has been investigated by means of conductivity and thermodynamic (density and speed of sound) studies at 25 °C. Studies have been carried out with variation in surfactant concentration at fixed [DS] = 5, 7, 9, 12 mM. The formulations have been characterized through the UV-vis spectroscopy. The spectra show a shift in λmax in the presence of Tweens. Critical micellization concentration, cmc, has been obtained from the conductivity-concentration plots. Conductivity results show an apparent change in curvature on addition of DS. Standard free energy of micellization, ÎGm°, has been estimated based upon the mass-action model. Apparent molar properties, viz. VÏ,s and KÏ,s, have been computed from the density and ultrasonic velocity measurements. Limiting parameters of Ïv° and Ïk° have been used to explain the solvation of surfactant monomers in association with DS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 268, Issues 1â3, 31 October 2005, Pages 90-98
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 268, Issues 1â3, 31 October 2005, Pages 90-98
نویسندگان
S.K. Mehta, Neeru Bala, Shweta Sharma,