کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
613196 880717 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Integral equation for calculation of distribution function of activation energy of shear viscosity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Integral equation for calculation of distribution function of activation energy of shear viscosity
چکیده انگلیسی

A new technique of calculation of a distribution function of activation energy (f(E)f(E)) of shear viscosity based on a regularization procedure applied to the Fredholm integral equation of the first kind has been developed using the Baxter-Drayton and Brady model for concentrated and flocculated suspensions. This technique has been applied to the rheological data obtained at different shear rates for aqueous suspensions with fumed silica A-300 and low-molecular (3,4,5-trihydroxybenzoic acid and 1,5-dioxynaphthalene) or high-molecular (poly(vinyl pyrrolidone) of 12.7 kDa and ossein of 20–29 kDa) compounds over a wide concentration range (up to 25 wt% of both components) and at different temperatures. Monomodal f(E)f(E) distributions are observed for the suspensions with individual A-300 or A-300 with a low amount of adsorbed organics. In the case of larger amounts of nanosilica and organics the f(E)f(E) distributions are multimodal because of stronger structurization and coagulation of the systems that require a high energy to break the coagulation structures resisting to the shear flow.

A new technique of calculation of a distribution function of activation energy of shear viscosity is developed using the Baxter-Drayton and Brady model for concentrated and flocculated suspensions.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 304, Issue 1, 1 December 2006, Pages 239–245
نویسندگان
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