Confining Effects in Composites Containing Molecular Sieves

Confinement of 4n-octyl-4′-cyanobiphenyl to nanoporous molecular sieves with hexagonal structure of cylindrical pores or with cellular structure is studied. It was found by differential scanning calorimetry and broadband dielectric spectroscopy that composites with the pores completely filled with l...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2004-01, Vol.418 (1), p.69-85
Main Authors: Frunza, Ligia, Frunza, Stefan, Enache, Irina, Beica, Traian, Schönhals, Andreas, Kosslick, Hendrik, Bentrup, Ursula, Pitsch, Irene
Format: Article
Language:English
Subjects:
Confinement Of Liquid Crystals
Cyanobiphenyls
Dielectric Spectroscopy
Infrared Spectra
Liquid Crystals
Nanoporous Molecular Sieves
Thermal Analysis
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Summary:Confinement of 4n-octyl-4′-cyanobiphenyl to nanoporous molecular sieves with hexagonal structure of cylindrical pores or with cellular structure is studied. It was found by differential scanning calorimetry and broadband dielectric spectroscopy that composites with the pores completely filled with liquid crystal show phase transitions characteristic for bulk, while the partially filled samples do not show these transitions. Thermogravimetric, differential thermal analysis and in situ infrared spectroscopic investigations have indicated first time that the dealkylation and oxidation of the confined liquid crystal is quite possible inside the nanopores of these molecular sieves, at temperatures much lower than for the bulk.
ISSN:1542-1406
1563-5287
DOI:10.1080/15421400490479145