We report on calorimetric and optical evaluations performed by Photopyroelectric calorimetry on two phenomena involving changes in average molecular alignment. We first study the possibility to obtain permanent homeotropic single domain alignment in the smecticA phase by applying a "vertical" strain field in the volume of samples of 4-decyl-4′-cyanobiphenyl and of 4-octyl-4′- cyanobiphenyl, liquid crystals. We then report on the effects produced by the illumination by UV light on 4-octyl-4′- cyanobiphenyl samples hosting photochromic molecules in terms of the change induced to the phase transitions characteristics and the average molecular alignment.

Zammit, U., Mercuri, F., Paoloni, S., Marinelli, M., & Pizzoferrato, R. (2015). Photopyroelectric Calorimetry for the Thermal and Optical Evaluations over Phase Transitions in Liquid Crystals. MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 614(1), 128-136 [10.1080/15421406.2015.1050291].

Photopyroelectric Calorimetry for the Thermal and Optical Evaluations over Phase Transitions in Liquid Crystals

ZAMMIT, UGO;MERCURI, FULVIO;PAOLONI, STEFANO;MARINELLI, MASSIMO;PIZZOFERRATO, ROBERTO
2015

Abstract

We report on calorimetric and optical evaluations performed by Photopyroelectric calorimetry on two phenomena involving changes in average molecular alignment. We first study the possibility to obtain permanent homeotropic single domain alignment in the smecticA phase by applying a "vertical" strain field in the volume of samples of 4-decyl-4′-cyanobiphenyl and of 4-octyl-4′- cyanobiphenyl, liquid crystals. We then report on the effects produced by the illumination by UV light on 4-octyl-4′- cyanobiphenyl samples hosting photochromic molecules in terms of the change induced to the phase transitions characteristics and the average molecular alignment.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
English
Calorimetry; phase transitions; polarization microscopy; thermal transport; Chemistry (all); Condensed Matter Physics; Materials Science (all)
http://www.tandfonline.com/toc/gmcl20/current
Zammit, U., Mercuri, F., Paoloni, S., Marinelli, M., & Pizzoferrato, R. (2015). Photopyroelectric Calorimetry for the Thermal and Optical Evaluations over Phase Transitions in Liquid Crystals. MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 614(1), 128-136 [10.1080/15421406.2015.1050291].
Zammit, U; Mercuri, F; Paoloni, S; Marinelli, M; Pizzoferrato, R
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/126927
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