کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1485791 1510553 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interrelation between shear modulus and the molecular parameters of viscous flow for glass forming liquids
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Interrelation between shear modulus and the molecular parameters of viscous flow for glass forming liquids
چکیده انگلیسی

The relationship between the free energy of viscous flow activation, the instantaneous modulus and the molar volume of kinetic units overcoming the barrier was derived by the author in the simplest form, ΔG≠ = F∞V∗, thirty-eight years ago. It was the result of the common solution for most general equations for the viscosity coefficient, the rate constant for shear relaxation in accordance with Maxwell’s relation. Here it is shown that this equation may be derived in the framework of the theory of elasticity and/or hydrodynamics. In this equation, V∗ = 8(r0)3NA, where V∗/NA in the theory corresponds to the cube volume containing an inscribed molecule (atom) of radius r0. The experimental proof of the equation shows that the atomic radii found from the viscous and elastic parameters match those obtained from direct structural investigations (X-ray and neutron scattering) with an average accuracy not worse than ∼5% (oxide, fluoride and chalcogenide glass melts). The theory needs development for molecular liquids with more complex structure. It is obvious that Maxwell’s relation is valid for modeling of viscous flow at the molecular level in supercooled liquids.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 26–27, 1 August 2006, Pages 2715–2725
نویسندگان
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