INVESTIGADORES
GARAY Raul Oscar
artículos
Título:
Symmetric bent-shaped liquid crystal dimers showing transitions between optically uniaxial and biaxial smectic phases
Autor/es:
CLAUDIA M. HEGGUILUSTOY; MARIA B. DARDA; ROSANA S. MONTANI; BENOÎT HEINRICH; BERTRAND DONNIO; DANIEL GUILLON; RAÚL O. GARAY
Revista:
LIQUID CRYSTALS
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Londres; Año: 2015
ISSN:
0267-8292
Resumen:
We report the synthesis of a new homologous series of symmetric bent-shaped liquid crystal dimers bearing oxybiphenylcarboxylate mesogens linked by a pentamethylene spacer. The dimers were characterized by optical, thermal, X-ray diffraction and computational techniques. Shorter dimers showed an I-N-SmA-SmC phase sequence with strong first order phase transitions. For the longer dimers, the unconventional uniaxial SmA phase present in shorter members collapsed. A 9:1 binary mixture of a bent dimer with a non-mesogenic dimer exhibited upon the SmA-SmC phase transition a maximum layer contraction of 1%.
