Dielectric, optical and TSM measurements on semi-perfluoro ferro- and antiferro-electric liquid crystals

• Tipo: Artigo em Revista Científica Internacional
• Data: 1998

Autores

Sarmento, S (Autor) Outra; Carvalho, PS (Autor) FCUP; Glogarova, M (Autor) Outra; Chaves, MR (Autor) FCUP; Nguyen, HT (Autor) Outra; Ribeiro, MJ (Autor) Outra

Revista

Título: Liquid Crystals

Vol. 25

Páginas: 375-385

ISSN: 0267-8292

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 10 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-77H

Abstract (EN): Two compounds with very similar chemical formulae but different phase sequences, denoted by F3H6 and P4H6, have been studied by dielectric, optical and TSM measurements, and by optical and polarization hysteresis loops. The light diffraction technique was used to measure the helical pitch (p), which was found to be nearly temperature independent. Six relaxation modes have been identified. The polarization and tilt angle results are discussed using a simple phenomenological model and fitted to the equation P-0/theta(0) approximate to (1/epsilon epsilon(0)C - Omega/C theta(0)(2))(-1). The parameters C and Omega were determined from the fitting.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11