Document Detail

Concentration dependent refractive index of a binary mixture at high pressure.
MedLine Citation:
PMID:  21787022     Owner:  NLM     Status:  Publisher    
In the present work binary mixtures of varying concentrations of two miscible hydrocarbons, 1,2,3,4-tetrahydronaphtalene (THN) and n-dodecane (C12), are subjected to increasing pressure up to 50 MPa in order to investigate the dependence of the so-called concentration contrast factor (CF), i.e., (∂n∕∂c)(p, T), on pressure level. The refractive index is measured by means of a Mach-Zehnder interferometer. The setup and experimental procedure are validated with different pure fluids in the same pressure range. The refractive index of the THN-C12 mixture is found to vary both over pressure and concentration, and the concentration CF is found to exponentially decrease as the pressure is increased. The measured values of the refractive index and the concentration CFs are compared with values obtained by two different theoretical predictions, the well-known Lorentz-Lorenz formula and an alternative one proposed by Looyenga. While the measured refractive indices agree very well with predictions given by Looyenga, the measured concentration CFs show deviations from the latter of the order of 6% and more than the double from the Lorentz-Lorenz predictions.
Fabrizio Croccolo; Marc-Alexandre Arnaud; Didier Bégué; Henri Bataller
Publication Detail:
Journal Detail:
Title:  The Journal of chemical physics     Volume:  135     ISSN:  1089-7690     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  034901     Citation Subset:  -    
Laboratoire des Fluides Complexes - UMR 5150, Université de Pau et des Pays de l'Adour, BP 1155, 64013 Pau Cedex, FranceInstitut Pluridisciplinaire de recherche sur l'Environnement et les Matériaux (IPREM) - UMR 5254, CNRS - Equipe de Chimie Physique, Université de Pau et des Pays de l'Adour, 2 avenue du Président Angot, 64053 Pau Cedex 9, France.
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