Abstract
Speed of sound, u, of dodecyltrimethylammonium bromide (DTAB) aqueous solutions has been determined at 295.15, 302.15 and 309.15 K. The speeds of sound, u, data have been used to estimate isentropic compressibility, Ks, apparent molal isentropic compressibility, φk(s), acoustic impedance, Z, molal sound of speed, Rm, and relative association, RA, of DTAB in aqueous solution. These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and micellar behavior of DTAB.
Highlights
Surfactants are amphiphilic molecules consisting of polar and non-polar parts
The aim of the present work is to analyze the influence of the presence of dodecyltrimethylammonium bromide (DTAB) aqueous solutions upon several physical properties that allow the characterization of this kind of solutions
The isentropic compressibility, Ks, apparent molal isentropic compressibility, φk(s), acoustic impedance, Z, molal sound of speed, Rm, and relative association, RA, have been determined and reported. These results confirmed that strong solute-solute, solute-solvent interactions occur in the reported system
Summary
Surfactants are amphiphilic molecules consisting of polar (hydrophilic) and non-polar (hydrophobic) parts. Due to their dual character (hydrophilic and hydrophobic) surfactants are employed in different industrial applications (Herzog et al, 1998). The dodecyltrimethylammonium bromide (DTAB) is bio-degradable, non-toxic and is widely available material at low costs. Survey of available literature reveals that no serious attempt has been made to study the micellization phenomenon of dodecyltrimethylammonium bromide (DTAB) surfactant in aqueous solvent. The aim of the present work is to analyze the influence of the presence of dodecyltrimethylammonium bromide (DTAB) aqueous solutions upon several physical properties that allow the characterization of this kind of solutions
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