The Influence of Natural and Model Nanoinclusions on the Properties of Nematic Phase

The present work is focused on the investigation of the influence of a small volume fraction of nanoinclusions on the Miesowicz viscosity coefficient η 2 of the nematic phase. Two kinds of nanoinclusions in the nematic phase have been studied: natural (smectic cybotactic clusters) and solid impuriti...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2011-01, Vol.545 (1), p.29/[1253]-35/[1259]
Main Authors: Janik-Kokoszka, Joanna, Moscicki, Józef K
Format: Article
Language:English
Subjects:
Aerosil nanoparticles
Clusters
cybotactic groups
Density
Liquid crystal polymers
Miesowicz viscosity coefficients
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Nematic
Phase transformations
Physical properties
Viscosity
Volume fraction
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Summary:The present work is focused on the investigation of the influence of a small volume fraction of nanoinclusions on the Miesowicz viscosity coefficient η 2 of the nematic phase. Two kinds of nanoinclusions in the nematic phase have been studied: natural (smectic cybotactic clusters) and solid impurities (AEROSIL® 380). The volume fraction of nanoinclusions was estimated using the Batchelor model. This allowed in turn for calculating their number density. For cybotactic clusters, we found that their number in the nematic phase of octyloxycyanbiphenyl (8OCB) goes over the maximum when approaching the nematic-smectic phase transition. To shed some light on that finding we also studied η 2 for a number of different AEROSIL® 380 suspensions in the nematic host of 4-trans-4′-n-hexylcyclohexyl isothiocyanatobenzene (6CHBT).
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2011.571968