A Volumetric Study of Water–Decyltrimethylanimonium Bromide–Pentanol Ternary System from 25 to 130°C at 2 and 19 MPa |
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| Authors: | A De Giacomo P D'Angelo A Inglese S Milioto R De Lisi |
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| Institution: | (1) Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy;(2) Department of Physical Chemistry, University of Palermo, Vialedelle Scienze, 90128 Palermo, Italy |
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| Abstract: | Density measurements on decyltrimethylammonium bromide (DeTAB)–water and pentanol (PentOH)–DeTAB–water systems as functions of both alcohol and surfactant m
S concentrations were carried out at 2 and 19 MPa from 25 to 130°C. From experimental data for the water–DeTAB binary system, the standard (infinite dilution) partial molar volumes, expansibilities, and compressibilities of DeTAB, and the corresponding properties in the micellar phase are calculated. The trends of the standard partial molar volumes of PentOH V
R
o
in DeTAB micellar solutions as functions of m
S reflect the transfer of PentOH from the aqueous to the micellar phase, except at 130°C and 19 MPa. On the basis of an equation previously used, the distribution constant of PentOH between the aqueous and the micellar phases and the standard partial molar volume of alcohol in the aqueous and the micellar phases are obtained from V
R
o
data. Comparisons with data for PentOH in dodecyltrimethylammonium bromide are made. |
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| Keywords: | Pentanol decyltrimethylammonium bromide apparent molar volume isothermal compressibility expansibility pentanol micelles-binding constant thermodynamic properties at high temperature and pressure thermodynamics of pentanol transfer from water to decyltrimethylammonium bromide micelles |
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