Kinetics of surfactant adsorption at fluid-fluid interfaces

Journal of Physical Chemistry

Volumn 100, Issue 32, 1996, Pages 13732-13742

  Diamant, Haim ^a   Andelman, David ^a  

^a TEL AVIV UNIVERSITY   (Israel)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 11544340919     PISSN: 00223654     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp960377k     Document Type: Article

References (45)

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21. 0, as we shall do, indeed, when considering the electrostatic repulsion in section 3.
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24. Note that the conditions at the interface are quite different from those inside the aqueous solution, and the diffusivities, D, appearing in eqs 2.10-2.14, cannot be expected to have strictly the same value, as we have assumed here for simplicity.
25. This is the so-called Tauberian method for finding asymptotic expressions using the Laplace transform.
26. 7-10
27. Note that in the discussion above we have completely neglected a third time scale - the time needed for lateral diffusion and molecular reorientation at the interface. If, however, due to certain molecular constraints, this time scale is no longer negligible, exceptions to the above conclusions are to be expected (see refs 25 and 26).
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33. As we shall see, this assumption is not strictly valid, i.e., the adsorption of counterions at the interface should not be ignored. We use it here for the sake of clarity and shall return to this point later.
34. Onsager, L.; Samaras, N. N. T. J. Chem. Phys. 1934, 2, 528.
35. Davies, J. T. Proc. R. Soc. A 1958, 245, 417.
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39. The limitation which the adsorption faces in such a case originates from the non-convexity of the interfacial free energy, i.e., it is a collective, macroscopic effect. It should not be confused with a possible potential barrier, of microscopic origin, that the surfactant may face when trying to move from the bulk to the interface. The latter can be accounted for by our model, as explained in section 2 and demonstrated in the current section for the case of an electrostatic barrier.
40. (0).
41. Bonfillon, A.; Langevin, D., private communication.
42. Since these assumptions render the profiles of the salt ions and the surfactant counterions irrelevant to the analysis of the adsorption, we omit in this section the superscript + from the variables and constants associated with the surfactant.
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