Solid state polymorphism of liquid crystals in confined geometries
Abstract:
Solid polymorphism of 4-alkyl-4'-cyanobiphenyl (nCB) was studied so far as a function of thermal history. In this paper we show that metastable solid phases of 4-octyl-4'-cyanobiphenyl (8CB) are also formed when the mesogens are confined in porous silica matrices and we study their structure by neutron diffraction and by Raman spectroscopy. Three metastable solid states are identified : one crystalline phase K', two frozen-in smectic-like phases K s and K's. We discuss the relation between the structure of the metastable solid phases and that of the mesomorph phases. © EDP Sciences / Società Italiana di Fisica / Springer-Verlag 2003.
Año de publicación:
2003
Keywords:
Fuente:
scopus
google
Tipo de documento:
Article
Estado:
Acceso restringido
Áreas de conocimiento:
- Ciencia de materiales
- Ciencia de materiales
Áreas temáticas:
- Química física
- Química inorgánica
- Ingeniería y operaciones afines