Journal of Surface Science and Technology

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Ultrasonic Velocity and Critical Micellar Concentration of Glycerol Monostearate in Mixed Organic Solvent at 290 K


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1 Department of Chemistry, Eternal University, Baru Sahib –173101, Himachal Pradesh, India
     

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Density, viscosity, ultrasonic velocity and refractive index measurements of Glycerol Monostearate (GMS) in 80/20 (% v/v) benzene-methanol mixture at 290 K with varying concentrations have shown that there is noticeable variation in aggregation of non-ionic surfactant at Critical Micellar Concentration (CMC). Density and viscosity results have been satisfactorily explained by some well-known equations viz. Jones-Dole, Moulik, Vand, Einstein and Root. Jacobson model has been used to evaluate adiabatic compressibility, molar compressibility, solvation number molar sound velocity, relaxation strength, relative association and other allied acoustical constants. The variation of refractive index with concentration of GMS solutions shows a marked change in value at CMC. Treatment of data obtained from density, viscosity, ultrasonic velocity and refractive index measurements has shown that strong interaction exists between GMS and solvent molecules, and GMS molecules do not aggregate considerably in pre-micellization region.

Keywords

Antistaling and Antistatic agents, Emulsifiers, Nonionic Surfactants.
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  • Ultrasonic Velocity and Critical Micellar Concentration of Glycerol Monostearate in Mixed Organic Solvent at 290 K

Abstract Views: 283  |  PDF Views: 3

Authors

Kritika Sharma
Department of Chemistry, Eternal University, Baru Sahib –173101, Himachal Pradesh, India
Sujata Negi
Department of Chemistry, Eternal University, Baru Sahib –173101, Himachal Pradesh, India
Kamal Kishore
Department of Chemistry, Eternal University, Baru Sahib –173101, Himachal Pradesh, India

Abstract


Density, viscosity, ultrasonic velocity and refractive index measurements of Glycerol Monostearate (GMS) in 80/20 (% v/v) benzene-methanol mixture at 290 K with varying concentrations have shown that there is noticeable variation in aggregation of non-ionic surfactant at Critical Micellar Concentration (CMC). Density and viscosity results have been satisfactorily explained by some well-known equations viz. Jones-Dole, Moulik, Vand, Einstein and Root. Jacobson model has been used to evaluate adiabatic compressibility, molar compressibility, solvation number molar sound velocity, relaxation strength, relative association and other allied acoustical constants. The variation of refractive index with concentration of GMS solutions shows a marked change in value at CMC. Treatment of data obtained from density, viscosity, ultrasonic velocity and refractive index measurements has shown that strong interaction exists between GMS and solvent molecules, and GMS molecules do not aggregate considerably in pre-micellization region.

Keywords


Antistaling and Antistatic agents, Emulsifiers, Nonionic Surfactants.

References





DOI: https://doi.org/10.18311/jsst%2F2019%2F16349