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- 저자 : Ishtiaque Ahmad (검색결과 1 건)
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Synthesis, surface active and thermal properties of novel imidazolium cationic monomeric surfactants
Pankaj Patial,Arifa Shaheen,Ishtiaque Ahmad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
A series of long chain water soluble cationics have been synthesized by using renewable raw materialslike fatty alcohols and epichlorohydrin. The surface activity of the molecules has been determined bymeasurement of their conductance and surface tension in aqueous solution. The dynamics of surfaceactivity of these surfactants have also been investigated in the presence of sodium halides, NaCl and NaBrby surface tension measurement. A series of useful parameters like critical micelle concentration (cmc),surface tension at the cmc (gcmc), adsorption efficiency (pC20), effectiveness of surface tension reduction(Pcmc), Gibbs free energy of the micellization (DG0 mic) and Gibbs free energy of adsorption (DG0 ads)have been determined from the measurements obtained by surface tension and conductivity method. Further with the application of the Gibbs adsorption isotherm, maximum surface excess concentration(umax) and minimum surface area/molecule (Amin) at the air–water interface were also estimated. Thermal stability of these long chain cationics has been measured by thermal gravimetric analysis undernitrogen atmosphere. Analysis of thermal stability measurement indicated that the thermal stability ofthese long chain imidazoliums increase with an increase in chain length
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