Positron annihilation in liquid crystals

被引:0
作者
Dryzek, Ewa [1 ]
Juszynska-Galazka, Ewa [1 ]
机构
[1] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland
关键词
liquid crystals; positron annihilation; phase transitions; TEMPERATURE-DEPENDENCE; SMECTIC E; E-PHASE; X-RAY; SPECTROSCOPY; HOMOLOGS; LIFETIME;
D O I
10.1515/nuka-2015-0125
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Positron annihilation studies of liquid crystals are reviewed with particular reference to thermotropic liquid crystals with rod-like molecules. The studies of compounds exhibiting smectic A or smectic E phases indicate that local arrangement of dipole molecules play an important role because high electron density at the end group of molecules can influence substantially formation and annihilation of positronium. The obtained ortho-positronium lifetimes in these phases can be explained by antiparallel pairing of molecules in case of the smectic A phase or a structure with a nanosegregation of alkyl chains and others parts of molecules into sublayers and liquid-like state of alkyl chains in case of the smectic E phase.
引用
收藏
页码:703 / 708
页数:6
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