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A New Method for Simultaneous Estimation of Micellization Parameters from Conductometric Data
Author(s) -
Jalšenjak Nenad,
Težak Đurđica
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400415
Subject(s) - counterion , critical micelle concentration , conductivity , pulmonary surfactant , chemistry , micelle , thermodynamics of micellization , chromatography , function (biology) , derivative (finance) , thermodynamics , bromide , analytical chemistry (journal) , sodium , inorganic chemistry , ion , physics , aqueous solution , organic chemistry , evolutionary biology , economics , financial economics , biology
A simple method for determination of the counterion binding parameter ( α ) and aggregation number ( N ) from conductivity data is proposed. The method is based on fitting the values of the first derivative of conductivity ( κ ) versus total surfactant concentration ( c t ) function according to the equation derived from the mass action model (MAM) by using different conductivity models. Sodium dodecylsulphate (SDS) and dodecyltrimethylammonium bromide (DTAB) were chosen for validation of the proposed method. It was shown that the method gives a fairly accurate values for micellisation parameters of SDS ( N =51–64, α= 0.74–0.75) and DTAB ( N =56–62, α= 0.77–0.79), both in good agreement with the literature data. In addition, application of the proposed method does not require the value of the critical micelle concentration (cmc).