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仪器网/ 行业应用/ 解决方案/ Adsorption of Ionic Surfactants at Liquid-Liquid Int

Adsorption of Ionic Surfactants at Liquid-Liquid Int

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Binary coalescence of water drops in organic liquids has several commercial applications that are related to
the stabilization of emulsions. The stability of the emulsion is dependent on adsorption of the surfactant
molecules at the water/organic interface. In this work, the adsorption of ionic surfactants at water/organic
interfaces, both in the presence and absence of salt, and its effect on binary coalescence were studied. The
ionic surfactants used were sodium dodecyl sulfate and cetrimide. The organic phase was constituted from
either toluene or carbon tetrachloride. Adsorption was studied by measuring the interfacial tension. The presence
of salt had a strong effect on the interfacial tension in the presence of these surfactants. In the absence of
surfactant, salt had little effect on interfacial tension. The data were fitted using a surface equation of state
that was developed from the Gibbs adsorption equation and the Langmuir isotherm. Binary coalescence of
water drops in toluene was studied in a specially designed coalescence apparatus. Coalescence time did not
have a single value but a stochastic distribution of coalescence time was observed in each case. The addition
of salt had a significant effect on coalescence time. A stochastic model was used to characterize the distributions.
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