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Self-assembly in surfactant-based liquid mixtures: Octanoic acid/Bis(2-ethylhexyl)amine systems.
MedLine Citation:
PMID:  22041199     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The physico-chemical properties of Bis(2-ethylhexyl)amine (BEEA) plus octanoic acid (OA) mixtures have been investigated by IR, SAXS, WAXS, viscosimetry, and AC complex impedance spectroscopy in the whole composition range. Mainly driven by proton transfer from the acidic OA to the basic BEEA, the formation of stoichiometrically well-defined adducts takes place in the mixtures. This causes the slowing down of molecular dynamics and the increase in charge carrier number density. Interestingly, while the pure components possess no significant conductivity (about 10(-12)Scm(-1) at 25°C), their mixtures show a composition-dependent enhanced conductivity (up to about 10(-5)Scm(-1)), i.e., more than seven orders of magnitude higher than that of the pure components. The comparison of the composition dependence of viscosity, direct-current conductivity, and static permittivity indicates the concurrence of contributions of different adducts and that the dynamics controlling molecular reorientation and momentum and charge transfer, even if ultimately related to the proton transfer from OA to BEEA, are different. The results can be used not only to design novel materials for application purposes, but also to shed more light on the principles regulating molecular self-assembly in surfactant-based liquid systems.
Authors:
Pietro Calandra; Vincenzo Turco Liveri; Pietro Riello; Isidora Freris; Andrea Mandanici
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-14
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  -     ISSN:  1095-7103     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-11-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
CNR-IPCF, Consiglio Nazionale delle ricerche, Sede di Messina, Via Ferdinando Stagno d'Alcontres, 37, 98158 Messina, Italy.
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