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R. K. Mohanty ¹, I. N. Basumallick ¹, S. Bhowmik ¹, A. Das ¹, T. K. Bhattacharya ¹

Affiliations
1 Department of Chemistry, Visva-Bharati, Santiniketan-731235, IN

Abstract

Free energies (ΔG⁰_m), Entropies (ΔS⁰_m) and Enthalpies (ΔH⁰_m) of micellisation of Cetyl-Trimethyl Ammonium Bromide (CTAB) in glycerol+water mixtures containing 10,30,40, and 50 weight percent of glycerol and in urea+water mix ures containing 10, 30 and 40 weight percent of urea have been reported from CMC measurements at 25,35 and 45°C using the conductance method. Analysis of ΔG⁰_m vs composition of cosolvent plots indicate that micellisation is favoured in both the solvent systems almost to the same extent except for the fact that micellisation is decreased at high concentration of glycerol and increased at high concentration of urea. Entropy (ΔS⁰_m) - composition profiles and Enthalpy (ΔH⁰_m)-composition profiles are more or less similar for both the systems, except at high cosolvent composition.

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S. Bhowmik ¹, S. Ray ²

Affiliations
1 B.E. College(D.U), Howrah-711103, IN
2 B. E. & SC. University, Howrah-711103, IN

Abstract

This paper deals with study of the effects of welding speed and welding heat on depth of heat affected zone and penetration in single run submerged arc automatic square butt welding. From the results it is established that the present work is an attempt to identify optimized processing parameters for successful welding in SAAW method.

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