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The Eighth Palestinian International Chemistry Conference (PICC 2015):Chemical Sciences Towards Knowledge Based Economy

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Sun, 2015-08-23 13:11 — Prof. Issam Rashid Ashqer
Research Title: 
Concentration and Temperature Dependence of Viscosity in Mode-Coupling theory of Binary Mixture of Water and Phenol
Authors: 
Shadia M. Elayyat
Authors: 
Mohammed Abu-Jafar
Authors: 
Issam Ashqer
Country: 
Palestine
Date: 
Wed, 2015-04-01
Research Abstract: 
The dynamic shear viscosity of a binary liquid mixture of water and phenol has been measured at different temperatures (32.0 ℃≤T≤75.0 ℃) and different concentrations (0.00% up to 100.00% by weight of phenol) by using glass capillary viscometer and Brookfield viscometer model DV-I+. The critical temperature and critical concentration have been determined to be 67.0 ℃ and 33.90% by weight of phenol respectively. The mode coupling theory (MCT) has been used to calculate the value of background viscosity (noncritical part of shear viscosity) η_0=0.684 cP, the Debye momentum cutoff q_D=0.786 Å^(-1) and the MCT constant A = 0.050. The intermolecular force range L of water and phenol molecules in a binary mixture has been calculated to be 11.17 Å, this large value indicates that the mutual force between binary mixture molecules considered as a week attractive force. The critical amplitude of specific heat at constant pressure at critical concentration and above critical temperature C_pc has been found to be 259.16 J/(kg.K) by using the two scale factor university.