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Transport Properties for Aqueous Solution of Sodium Sulfonate Surfactants

Summary: Transport Properties for Aqueous Solution
of Sodium Sulfonate Surfactants
1. Mutual Diffusion Measurements: Evaluation of the Equilibrium Parameters
for the Micellization Process
Onofrio Annunziata, Lucia Costantino, Gerardino D'Errico, Luigi Paduano, and Vincenzo Vitagliano
Dipartimento di Chimica, Universita` di Napoli, Federico II, Via Mezzocannone 4, 80134 Naples, Italy
E-mail: vita@chemna.dichi.unina.it
Received July 24, 1998; accepted April 14, 1999
Isothermal mutual diffusion coefficients (D) have been mea-
sured for binary aqueous solutions of sodium alkylsulfonates at
25C. The diffusion coefficient values drop as the concentration of
micelles in the system increases. As the length of the hydrocarbon
chain increases, the observed drop in D becomes increasingly
sharp and shifts to lower concentrations. When the micellization
process is treated as a chemical equilibrium, diffusion coefficients
lead to the calculation of the thermodynamic parameters associ-
ation number, n, and the equilibrium constant, K. These param-
eters are briefly discussed in connection with the alkyl chain length
of the surfactants. 1999 Academic Press
Key Words: diffusion; micelle(s); sodium alkyl sulfonates.


Source: Annunziata, Onofrio - Department of Chemistry, Texas Christian University


Collections: Chemistry