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Titolo:
ORIENTATIONAL DYNAMICS IN THE ISOTROPIC-PHASE OF A NEMATIC MIXTURE - SUBPICOSECOND TIME-RESOLVED OPTICAL KERR-EFFECT EXPERIMENTS ON ZLI-1167 LIQUID-CRYSTAL
Autore:
TORRE R; RICCI M; SAIELLI G; BARTOLINI P; RIGHINI R;
Indirizzi:
UNIV FLORENCE,EUROPEAN LAB NON LINEAR SPECT,LARGO E FERMI 2 I-50125 FLORENCE ITALY UNIV FLORENCE,DEPT CHEM I-50121 FLORENCE ITALY
Titolo Testata:
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
, volume: 262, anno: 1995,
pagine: 391 - 402
SICI:
1058-725X(1995)262:<391:ODITIO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
STIMULATED LIGHT-SCATTERING; PLASTIC PHASE; SOLIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
R. Torre et al., "ORIENTATIONAL DYNAMICS IN THE ISOTROPIC-PHASE OF A NEMATIC MIXTURE - SUBPICOSECOND TIME-RESOLVED OPTICAL KERR-EFFECT EXPERIMENTS ON ZLI-1167 LIQUID-CRYSTAL", Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 262, 1995, pp. 391-402

Abstract

We have investigated the orientational dynamics of the ternary mixture of propyl, pentyl and heptyl cyano-cyclohexyls (ZLI-1167) in the isotropic phase over a wide temperature range (372-453 K) by means of transient optical Kerr effect spectroscopy. The orientational dynamics ofZLI-1167 isotropic phase shows a complex relaxation pattern where several dynamical processes take place. We substantially observed three time scales of relaxation: fast (from hundreds of fsec to few psec), intermediate (from tens to hundreds of psec) and slow (from hundreds of psec to few nsec). The slow orientational relaxation shows a temperature dependence characterized by strong pre-transitional effects. The critical slowing down of these relaxation times can be correctly interpreted by Landau-de Gennes theory. The fast and intermediate decay timesshow a different temperature dependence without any observable pre-transitional effects. We suggest an interpretation of the experimental results in term of averaged single molecule dynamics and collective dynamics.

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Documento generato il 30/09/20 alle ore 12:53:59