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    STUDIA CHEMIA - Issue no. 1 / 2003  
         
  Article:   ADSORPTION KINETICS OF DIBUCAINE AND TETRACAINE AT THE BENZENE/WATER INTERFACE STUDIED BY PENDANT DROP METHOD.

Authors:  MARIA TOMOAIA-COTISEL, JANOS ZSAKO, AURORA MOCANU, MARIUS SĂLĂJAN, CSABA RACZ, SIMONA BRAN, EMIL CHIFU.
 
       
         
  Abstract:  Dynamic interfacial tensions have been measured at the benzene/water interface in order to study the adsorption behavior of some local anesthetics, namely dibucaine and tetracaine, from the aqueous bulk solutions at the interface with pure benzene. For this purpose the pendant drop method was used. To describe the adsorption kinetics of these anesthetics at liquid interface, a new theoretical approach has been developed for the diffusion controlled adsorption of surfactants at the benzene/water interface. Therefore, various kinetic equations are tested and a new diffusion controlled kinetic equation is proposed, based on the Ward and Tordai diffusion equation associated with the two dimensional van der Waals state equation. This analysis provides a better understanding of the interfacial properties of adsorbed anesthetics layers at liquid interfaces. Diffusion coefficients, subsurface concentrations and molecular interaction parameters are derived from the experimental data and discussed in terms of the local anesthetics molecular structure.  
         
     
         
         
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