engleski

Dissolution of Anionic Surfactants. Effect of Cations on the Change of Heat Capacity.

Dissolution of surface active agents in water usually results in significant heat capacity change, Cp, which is due to water structuring around the nonpolar "tails". For most surfactants, Cp is proportional to the chain lenght. Heat of dissolution of various salts of anionic surfactants was measured by the reaction calorimeter. Heat capacity change was evaluated from the temperature dependence of the enthalphy. the effect of cations on the Cp of dissolution of fatty and sulphonic acid salts was investigated. All the examined surfactans showed a similar effect. However, the value of Cp was found to be unusually high for copper dodecyl and tetradecyl sulphonates, which was explained in terms of the solid phase hydration.

anionic surfactants; calorimetry; heat capacity change of dissolution; aqueous surfactant solution; copper alkyl sulphonate

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