Debye Momentum Cutoff of the Critical Binary Mixture of Carbon Tetrachloride and Coconut Oil

Journal Title, Volume, Page:

Materials Science · March 2015

Year of Publication:

2015

Authors:

Yusur. H. Kittany

Current Affiliation:

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

Issam Ashqer

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

The dynamic shear viscosity coefficients of the binary liquid mixture carbon tetrachloride and coconut oil for different temperatures and concentrations are measured using digital viscometer with UL adapter. Shear viscosity anomaly is clearly observed near the critical temperature Tc = 22.2 ℃ and the critical concentration xc = 0.732 by weight of carbon tetrachloride. Debye parameter L (the intermolecular force range) was calculated using a light scattering formula to be L = 5.5 Å. Mode Coupling Theory (MCT) of the dynamic shear viscosity is used to fit our experimental data above the critical temperature in the range 0.05 ≤ T-Tc ≤ 8 ℃. It is found that the noncritical part of the dynamic shear viscosity (background viscosity) η0 = 2.59 cP and the Debye momentum cutoff (the upper cutoff wave number) qD = 0.126 Å-1. The MCT universal constant A is measured to be A = 0.054 which is consistent with the theoretical value.

Attachment	Size
Debye_Momentum_Cutoff_of_the_Critical_Binary_Mixture_of_Carbon_Tetrachloride_and_Coconut_Oil.pdf	273.62 KB

An-Najah Staff

Author Information

Debye Momentum Cutoff of the Critical Binary Mixture of Carbon Tetrachloride and Coconut Oil