Electrochemical studies associated with the micellization of dodecyltrimethyl ammonium bromide (DOTAB) in aqueous solutions of ethanol and 1-propanol

In this work an ion-selective electrode (ISE) sensitive to dodecyltrimethylammonium bromide (DOTAB) has been fabricated and physical parameters of DOTAB have been determined in the presence of different salt and alcohol (ethanol and 1-propanol) concentration. The free monomer concentration of DOTAB...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 1998-04, Vol.136 (1), p.123-132
Main Authors: Gharibi, H., Razavizadeh, B.M., Rafati, A.A.
Format: Article
Language:English
Subjects:
Alcohol-surfactant mixture
Dodecyltrimethylammonium bromide (DOTAB)
Mixed solvent
Potentiometry
Premicellar aggregation
Surfactant
Surfactant selective electrode
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Summary:In this work an ion-selective electrode (ISE) sensitive to dodecyltrimethylammonium bromide (DOTAB) has been fabricated and physical parameters of DOTAB have been determined in the presence of different salt and alcohol (ethanol and 1-propanol) concentration. The free monomer concentration of DOTAB ( m 1), degree of dissociation of surfactant (α), salt effect in aqueous solution and the equilibrium constant of premicellar aggregation have been investigated using potentiometric technique. Finally the degree of alcohol attachment was determined. These values indicate that for each surfactant cation (DOTA +) approximately three ethanol molecules and two propanol molecules can be incorporate in the micelle.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(97)00305-1