Does transparent nematic phase exist in 5CB∕DDAB∕water microemulsions? From the viewpoint of temperature dependent dielectric spectroscopy

Chen, Zhen and Nozaki, Ryusuke (2011) Does transparent nematic phase exist in 5CB∕DDAB∕water microemulsions? From the viewpoint of temperature dependent dielectric spectroscopy. The Journal of Chemical Physics, 134 3: 034505.1-034505.10. doi:10.1063/1.3530782

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Author Chen, Zhen
Nozaki, Ryusuke
Title Does transparent nematic phase exist in 5CB∕DDAB∕water microemulsions? From the viewpoint of temperature dependent dielectric spectroscopy
Journal name The Journal of Chemical Physics   Check publisher's open access policy
ISSN 0021-9606
1089-7690
Publication date 2011-01
Sub-type Article (original research)
DOI 10.1063/1.3530782
Open Access Status File (Author Post-print)
Volume 134
Issue 3
Start page 034505.1
End page 034505.10
Total pages 10
Place of publication College Park, MD United States
Publisher American Institute of Physics
Collection year 2011
Language eng
Formatted abstract
Liquid crystal colloids have received tremendous attention because of its great potential both in the understanding of the liquid crystalline phase and in searching for new application of liquid crystals. Inverse microemulsion composed of 4-cyano-4-n-pentylbiphenyl (5CB), didodecyl dimethyl ammonium bromide, and water was investigated by means of broadband dielectric spectroscopy in this study. Based on the understanding of previous investigations on the same system, the isotropic phase was taken into account to quantitatively characterize the bulklike relaxations after the isotropic-to-nematic phase transition. Analogous results concerning the phase transition and phase composition to other investigations were obtained. In addition to bulklike relaxations, a new relaxation was observed at the frequency range about two orders lower than bulklike relaxations. This new relaxation shows abnormal temperature dependence, suggesting that superstructures composed of water droplets and confined 5CB molecules exist. This superstructure possibly possesses a confined nanoscaled liquid crystal ordering and may correspond to the notion of the transparent nematic phase
Keyword Phase transitions
Dielectric devices
Electrochemical Impedance Spectroscopy (eis)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Thu, 21 Mar 2013, 12:15:35 EST by Zhen Chen on behalf of School of Civil Engineering