کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10603293 | 982474 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rheology and dynamic light scattering of octa-ethyleneglycol-monododecylether/chitosan solutions
ترجمه فارسی عنوان
رئوئولوژی و پراکندگی نور پویا از محلول های هکتا-اتیلن-گلیکول-مونوودد کایلر / کیتوزان
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کلمات کلیدی
تعاملات کیتوزان-سورفاکتانت، رئوئولوژی، پراکندگی نور پویا، توزیع نرخ آرامش،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
In this work we used rheometry and DLS to probe relaxation phenomena in solutions of chitosan and octa-ethyleneglycol-monododecylether. The dispersions had a marked pseudoplastic behavior, which became less evident, as surfactant concentration was increased. Arrhenius plots showed that systems with surfactant presented a characteristic temperature at which apparent enthalpy of activation (varying from 3 to 40 kJ molâ1) changed: this change was correlated to a possible transition of colloidal aggregates to a wormlike configuration. DLS intensity correlation functions were described by KWW equation: pure chitosan solutions had relaxation rate distributions centered at a characteristic relaxation rate around 4.6 Ã 10â6 μSâ1; as surfactant was added, a new component, with a faster characteristic relaxation rate with a magnitude order of 10â3 μsâ1, appeared. It was shown that the dependence between these relaxation rates and surfactant concentration could be used to describe DLS-related relaxation phenomena as an Arrhenius-activated process, agreeing with results obtained using rheometry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 98, Issue 1, 15 October 2013, Pages 321-330
Journal: Carbohydrate Polymers - Volume 98, Issue 1, 15 October 2013, Pages 321-330
نویسندگان
Z.M. dos Santos, M.R. Pereira, J.L.C. Fonseca,