Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 50: Issue 5-6
Calorimetric investigation of water/lecithin/cyclohexane microemulsions
Authors:
V. ArcoleoDepartment of Physical Chemistry, University of Palermo, Via Archirafi 26, 90123 Palermo

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M. GoffrediDepartment of Physical Chemistry, University of Palermo, Via Archirafi 26, 90123 Palermo

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G. La MannaDepartment of Physical Chemistry, University of Palermo, Via Archirafi 26, 90123 Palermo

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V. LiveriDepartment of Physical Chemistry, University of Palermo, Via Archirafi 26, 90123 Palermo

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F. AliottaInstitute of Spectroscopic Techniques, C.N.R., Messina, Italy

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M. FontanellaInstitute of Spectroscopic Techniques, C.N.R., Messina, Italy

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Pages:
823–830
Online Publication Date:
02 Aug 2005
Publication Date:
01 Dec 1997
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf01979212
Keywords:
calorimetry; lecitin reversed micelles; oregno-gels
Restricted access

Abstract  

The enthalpies of dilution of water/lecithin/cyclohexane microemulsion-gels at variousR values (R=[water]/[lecithin]) and molar enthalpies of solution of water in lecithin/cyclohexane at a fixed lecithin concentration were determined calorimetrically at 25°C. Through a description of the process of dilution of water/lecithin/cyclohexane microemulsion-gels as one involving mainly the scission of lecithin reversed micelles in to smaller ones, the concentration dependence of the enthalpy was rationalized. Surprisingly, in order to account for the dilution enthalpies, it was not necessary to hypothesize a thermal effect arising from the breakage of the micellar network present in the micremulsion-gels. This result indicates that the building-up of the micellar network mainly arises from topological entanglements and steric hindrances among the lecithin reversed micelles. Attribution of the molar enthalpy of solution of water essentially to the thermal effect arising from the intermicellar aggregation process induced by the water addition allowed a rough estimation of the scission energy (the energy necessary to break an Avogadro's number of micelles) and of the micellar aggregation number.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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