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    STUDIA CHEMIA - Issue no. 1 / 2006  
         
  Article:   ADSORPTION KINETICS OF STEARIC ACID AT THE BENZENE/WATER INTERFACE.

Authors:  MARIA TOMOAIA COTIŞEL.
 
       
         
  Abstract:  The adsorption kinetics of stearic acid from benzene solutions at the benzene/water interface was studied by using the pendant drop method. Kinetic equations for diffusion controlled adsorption and for Langmuir adsorption were tested. A theoretical approach to the dynamic interfacial pressures is developed and a new kinetic equation for the diffusion controlled kinetics is proposed, based on Ward and Tordais diffusion equation associated with a two dimensional van der Waals state equation. It is shown that this approach describes the dynamic interfacial pressures within the limits of the experimental errors and the new equation is valid over a wide range of time and for different surfactant concentrations in oil solutions. It is also concluded that this new approach allows the calculation of diffusion coefficients, subsurface concentrations and intermolecular interaction parameters within adsorbed layers of biosurfactants at the oil/water interfaces. Obtained results are in substantial agreement with similar earlier reported data for the surfactant adsorption at liquid/liquid interfaces.  
         
     
         
         
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