Capacitance and optical studies of elastic and dielectric properties in an organosiloxane tetrapode exhibiting a NB phase

Biaxial (NB) and uniaxial nematic (NU) phase behavior was detected and confirmed for an organosiloxane tetrapode material using capacitance and birefringence measurements. Elastic constants, permittivities at two distinct low frequencies, and birefringencies were determined as a function of temperat...

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Bibliographic Details
Published in:The Journal of chemical physics 2013-03, Vol.138 (12)
Main Authors: Polineni, S., Figueirinhas, J. L., Cruz, C., Wilson, D. A., Mehl, G. H.
Format: Article
Language:English
Subjects:
Birefringence
Capacitance
Dielectric constant
Elastic constants
Low frequencies
Optical properties
Permittivity
Switching
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Summary:Biaxial (NB) and uniaxial nematic (NU) phase behavior was detected and confirmed for an organosiloxane tetrapode material using capacitance and birefringence measurements. Elastic constants, permittivities at two distinct low frequencies, and birefringencies were determined as a function of temperature over both the NU and the NB phase ranges. The NU-NB transition is clearly observed in the birefringencies and conoscopy data. A temperature dependent cross-over frequency is also detected in this material for the permittivities, allowing the electrical switching of both planar and homeotropic aligned samples.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4795582