Interfacial composition, structural parameters and thermodynamic properties of water-in-oil microemulsions |
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| Authors: | L Digout K Bren R Palepu S P Moulik |
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| Institution: | (1) Department of Chemistry, St. Francis Xavier University, Antigonish Nova Scotia, B2G 2W5, Canada e-mail: rpalepu@stfx.ca Tel.: +1-902-8673886 Fax: +1-902-8672414, CA;(2) Centre for Surface Science, Department of Chemistry, Jadavpur University, Calcutta 700 032, India, IN |
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| Abstract: | The formation and structural characteristics of water-in-oil microemulsions comprising hexadecylpyridinium chloride (CPC),
alkanols (C4–C6) and alkanes (C5, C8–C10) have been investigated by the method of dilution. The compositions of the surfactant and the cosurfactant in the interfacial
region (interphase) of the microemulsion droplets have been determined. The thermodynamics of transfer of the cosurfactants
(alkanols) from the continuous oil (alkane) phase to the interface have been evaluated from dilution measurements at different
temperatures. The structural parameters, radii of the droplet and the waterpool, aggregation numbers of CPC and the alkanols
in the interphase of a droplet, and the nanoparticle density of solution have been estimated assuming monodispersity of the
droplets. The thermodynamics and structural parameters have been examined in terms of the chain lengths of the alkanols and
alkanes.
Received: 12 September 2000 Accepted: 27 October 2000 |
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| Keywords: | Microemulsions Interfacial composition Distribution constant Structural parameters and thermodynamic properties |
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