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Your search keyword '"Vinjamur, M."' showing total 20 results
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20 results on '"Vinjamur, M."'

6. ANGULAR PROPERTIES OF LITHIUM TITANATE PARTICLES-AN EXPERIMENTAL STUDY

Author

Mandal, D., Vinjamur, M., and Dakshinamorthy Sathiyamoorthy

Subjects
Lithium Titanate, Fluidization, Molecular-Dynamics, Angle Of Internal Friction, Size, Angle Of Repose, Repose, Iter, Segregation, Blanket, Powders, Bed, Angle
Abstract

Angle of repose and angle of internal friction are two important macroscopic parameters in characterizing granular materials and reliable flow index in fluidization studies. This paper presents an experimental study to measure the angular properties, namely, angle of repose and angle of internal friction of lithium titanate (Li2TiO3) and silica particles. Lithium titanate is a primary contender for the solid breeder material for fusion reactors. Experimental results showed that the angle of repose of fine Li2TiO3 particles increases with increase in particle size, whereas the angle of internal friction decreases with increase in particle size. It was observed that the angle of repose varies in the range 31.7 to 35.62 deg, whereas angle of internal friction varies in the range 74.3 to 76.3 deg. A relationship between angle of repose and angle of internal friction for Li2TiO3 has been established. These results are useful to understand the flow characteristics of Li2TiO3 particles in a gas fluidized bed.

Published
2012

20. Insights into Adsorptive Drug Loading on Silica Aerogels from Supercritical CO 2 .

Author

Singh N, Vinjamur M, and Mukhopadhyay M

Subjects
Adsorption, Carbon Dioxide, Ibuprofen, Silicon Dioxide, Fenofibrate
Abstract

This work gives an insight into the process of adsorptive drug loading in silica aerogels from supercritical CO 2 (scCO 2 ). A prevalent method for such loading entails bringing the aerogels into contact with the drug-scCO 2 solution followed by slow or isothermal depressurization. Our previous work established that drug precipitates during depressurization. Consequently, the adsorptive drug loading measured by the prevalent method includes precipitation. An alternative method is presented for accurate measurement of adsorption avoiding precipitation. To illustrate the disparity between the two methods, the concentration dependence of drug loadings in scCO 2 , obtained by both methods, is compared for fenofibrate, ibuprofen, and benzoic acid. A mechanism is proposed, and a mathematical model is developed for comparing the adsorptive drug loadings by both methods. The loading obtained by the present method is found to be much less than that by the prevalent method, though both correlate well with the formalism of the Langmuir adsorption equation with the same equilibrium constant at low concentrations. Equations are developed for the concentration dependence of drug loadings measured by both methods at all concentrations in scCO 2 .

Published
2022
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