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  • Title: Influence of anionic surfactants on the electric percolation of AOT/isooctane/water microemulsions.
    Author: García-Río L, Mejuto JC, Pérez-Lorenzo M, Rodríguez-Alvarez A, Rodríguez-Dafonte P.
    Journal: Langmuir; 2005 Jul 05; 21(14):6259-64. PubMed ID: 15982028.
    Abstract:
    A study was carried out concerning the influence of sodium alkyl sulfonates on the electric percolation of AOT/isooctane/water microemulsions ([AOT] = 0.5 M and W = [H2O]/[AOT] = 22.2). An important effect was observed with regard to the percolation temperature caused by the addition of small quantities of alkyl sulfonates (rho = [alkyl sulfonate]/[AOT] = 0.01). The short chain alkyl sulfonates (C3-C5) cause an increase in the percolation temperature, which in turn is reduced as we increase the chain length of the additive until we obtain a percolation temperature which is lower than that which is observed in the absence of an additive (C6-C8). For hydrocarbon chains of a greater length we can observe a new increase in the percolation temperature (C10-C18). This behavior has been explained as a consequence of (i) the incorporation of the additives at the interphase of the microemulsion and (ii) the geometric parameters of the different surfactants added to the microemulsion.
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