Asian Journal of Research in Chemistry

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Surface and Thermodynamic Properties of Cetyl Pyridinium Chloride (CPC) in Aqueous Sodium Chloride Solutions at Various Temperatures


Affiliations
1 Department of Chemistry, Government College, Hisar, 125001, India
2 Jain P.G. College, Mujaffar Nagar (U.P.), 251001, India
3 Department of Chemistry, D A V College, Dehradun, India
4 Department of Chemistry, CCS Haryana Agricultural University, Hisar 125 004, India
     

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Critical micelle concentration (CMC), maximum surface excess concentration (Γmax), minimum area per molecule (Amin) at air-liquid interface of cetyl pyridinium chloride (CPC) in aqueous sodium chloride solutions have been, tensiometrically, determined at 288.15, 293.15 and 298.15 K. Thermodynamic parameters of micellization as well as of adsorption at air-liquid interface have been evaluated. Whereas micellization process is exothermic, adsorption of surfactant at the air-liquid interface is endothermic in nature. The latter process however becomes feasible owing to the predominant entropy gain.


Keywords

Critical Micelle Concentration, Tensiometrically, Micellization, Adsorption, Entropy.
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  • Surface and Thermodynamic Properties of Cetyl Pyridinium Chloride (CPC) in Aqueous Sodium Chloride Solutions at Various Temperatures

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Authors

Ram Partap
Department of Chemistry, Government College, Hisar, 125001, India
Neelam Swaroop
Jain P.G. College, Mujaffar Nagar (U.P.), 251001, India
D. K. Tyagi
Department of Chemistry, D A V College, Dehradun, India
O. P. Yadav
Department of Chemistry, CCS Haryana Agricultural University, Hisar 125 004, India

Abstract


Critical micelle concentration (CMC), maximum surface excess concentration (Γmax), minimum area per molecule (Amin) at air-liquid interface of cetyl pyridinium chloride (CPC) in aqueous sodium chloride solutions have been, tensiometrically, determined at 288.15, 293.15 and 298.15 K. Thermodynamic parameters of micellization as well as of adsorption at air-liquid interface have been evaluated. Whereas micellization process is exothermic, adsorption of surfactant at the air-liquid interface is endothermic in nature. The latter process however becomes feasible owing to the predominant entropy gain.


Keywords


Critical Micelle Concentration, Tensiometrically, Micellization, Adsorption, Entropy.