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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Thermodynamics of aggregation of Tweens in the presence of diclofenac sodium
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, ΔGm°, has been estimated based upon the mass-action model. Apparent molar properties, viz. Vϕ,s and Kϕ,s, have been computed from the density and ultrasonic velocity measurements. Limiting parameters of ϕv° and ϕk° 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 1–3, 31 October 2005, Pages 90-98
نویسندگان
, , ,