Positron annihilation in liquid crystals

• Autorzy: Dryzek E. , Juszyńska-Gałązka E.

Identyfikatory

DOI

10.1515/nuka-2015-0125

• Konferencja: Polish Seminar on Positron Annihilation (42 nd ; 29.06-01.07.2016 ; Lublin, Poland)
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

liquid crystals; positron annihilation; phase transitions

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2015
• Tom: Vol. 60, No. 4, part 1
• Strony: 703--708
• Opis fizyczny: Bibliogr. 38 poz., rys.

Twórcy

autor

Dryzek E.

• Institute of Nuclear Physics of the Polish Academy of Sciences, 152 Radzikowskiego Str., 31-342 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Juszyńska-Gałązka E.

• Institute of Nuclear Physics of the Polish Academy of Sciences, 152 Radzikowskiego Str., 31-342 Kraków, Poland, Tel.: [phone], Fax: [phone]

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