Influence of hydrotrope on micellization behaviour of zwitterionic dimeric surfactants carrying ammonium and phosphodiester headgroups at different temperatures in aqueous medium

2021 ◽  
pp. 116927
Author(s):  
Mohmad Shafi Sheikh ◽  
Nusrat Shafi ◽  
Ahmad Jahan Khanam ◽  
Kareem Yusuf ◽  
Asma A. Alothman ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Different Temperatures ◽  
Dimeric Surfactants

Physicochemical investigation on thiomalate complexes of nickel

1968 ◽  
Vol 21 (3) ◽  
pp. 641 ◽  
Author(s):  
RS Saxena ◽  
KC Gupta ◽  
ML Mittal
Keyword(s):  
Aqueous Medium ◽  
Stability Constants ◽  
Alternative Methods ◽  
Acid System ◽  
Kcal Mole ◽  
Physicochemical Investigation ◽  
Different Temperatures ◽  
The Stability ◽  
Ph Range ◽  
Deep Violet

Potentiometric and conductometric studies of the nickel-thiomalic acid system, in aqueous medium of 0. lM KNO3, reveal the formation of two complexes; one light violet 1 : 1 predominating at pH 6.5-7.5 and another deep violet 1 : 2 in the pH range 8.5-10.0. The stability constants of the complexes formed have been determined by applying Calvin and Melchior's extension of Bjerrum's method at three different temperatures and were further refined by using alternative methods. The logK values (final) for 1 : 1 and 1 : 2 complexes at 20, 25, and 30� have been found to be 7.86, 7.87, 7.96, and 6.24, 6.31, 6.39 respectively. The values of the overall changes in ΔG, ΔH, and ΔS accompanying the reaction have also been evaluated at 25� and found to be -19.31 kcal/mole, -8.77 kcal/mole, and +35.36 cal/deg respectively.

Analysis of Mixed Micellar Behavior of Promazine Hydrochloride with Surfactants in Aqueous Medium at Different Temperatures and Compositions

2013 ◽  
pp. 130422000216009
Author(s):  
Malik Abdul Rub ◽  
Abdullah M. Asiri ◽  
Naved Azum ◽  
Anish Khan ◽  
Aftab Aslam Parwaz Khan ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Different Temperatures

scholarly journals Oxidative Decarboxylation and Deamination of Essential Amino Acids by Nicotinium Dichromate - A Kinetic Study

2015 ◽  
Vol 45 ◽  
pp. 66-72
Author(s):  
K. Vivekanandan ◽  
R. Lakshmi Narayanan
Keyword(s):  
Amino Acids ◽  
Ionic Strength ◽  
Kinetic Study ◽  
Aqueous Medium ◽  
Perchloric Acid ◽  
Sodium Perchlorate ◽  
Essential Amino Acids ◽  
Oxidative Decarboxylation ◽  
First Order ◽  
Different Temperatures

The oxidation of essential amino acids like valine, leucine, isoleucine, threonine, phenylalanine and histidine using nicotinium dichromate in aqueous medium in presence of perchloric acid at 313 K leads to the formation of corresponding aldehydes. The reaction is first order with respect to nicotinium dichromate, fractional order with respect to amino acids and second order with respect to perchloric acid. Increase in ionic strength by the addition of sodium perchlorate has no effect on the rate constant. There is no polymerization with acrylonitrile. The reaction has been studied at different temperatures and a mechanism confirming to the kinetic observations is suggested.

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