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Positron lifetime measurements in chiral nematic liquid crystalsPositron lifetimes in the isotropic phases of chiral nematic liquid crystal formulations and their mixtures up to the racemic level were measured. The lifetime spectra for all liquid crystal systems were analyzed into three components. Although the individual spectra in the left- and right-handed components are identical, their racemic mixtures exhibit much larger orthopositronium lifetimes; these larger lifetimes indicate the presence of larger microvoids. This result is consistent with the reportedly higher thermodynamic stability and color play range in the racemic mixtures of chiral nematic liquid crystals.
Document ID
19920001459
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Singh, Jag J. (NASA Langley Research Center Hampton, VA, United States)
Eftekhari, Abe (Hampton Univ. VA., United States)
Parmar, Devendra S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1991
Subject Category
Solid-State Physics
Report/Patent Number
L-16948
NAS 1.60:3122
NASA-TP-3122
Accession Number
92N10677
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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