Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/56963
Title: Influence of some added electrolytes on the surface and thermodynamic properties of cetylpyridinium chloride in aqueous medium
Authors: Bala, Suman
Partap, Ram
Tyagi, D K
Yadav, O P
Keywords: Surface properties;Thermodynamic properties;Cetylpyridinium chloride;Added electrolytes
Issue Date: Apr-2021
Publisher: NISCAIR-CSIR, India
Abstract: The effect of some added electrolytes, viz. NaCl, CaCl2 and AlCl3, on the critical micelle concentration (CMC), maximum surface excess concentration (Gmax) and minimum area per molecule (Amin) at air-liquid interface of a cationic surfactant cetylpyridinium chloride (CPC) in aqueous solutions have been studied at 288.15, 293.15 and 298.15 K using tensiometric method. The effect of an added electrolyte on decreasing CMC of CPC is found to be in the order (AlCl3) > (CaCl2) > (NaCl), which falls in the same order as of the moles chloride ions furnished by each mole of the added electrolyte. The Gmax decreases with increasing temperature and electrolyte concentration leading to an enhanced available area per molecule at the air-liquid interface. The process of micellization and adsorption of CPC at air-liquid interface are both favoured by exothermic enthalpy change as well as entropy gain. The observed features such as lowering of CMC, higher thermodynamic micellar stability, more relaxed surfactant molecules at the interface, due to an added electrolyte, may be exploited for improving the efficiency of the surfactant as a detergent, solubilizing agent, froth floatation process for concentrating ores, petroleum oil recovery and oil spill management.
Page(s): 561-568
URI: http://nopr.niscair.res.in/handle/123456789/56963
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.60A(04) [April 2021]

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