Structure and Properties of New de Vries SmA∗ Liquid Crystals
Artikel i vetenskaplig tidskrift, 2004

We synthesized a chiral mesogen AC11 and two different siloxanes MSi2-AC11 and DSi3-AC11 derived from it by a hydrosilylation reaction. The effects of varying the molecular architecture were investigated with special attention being devoted to the occurrence of the de Vries SmA* phase. Strong hints that all the three molecules follow the scenario suggested by de Vries were found in the behavior of the susceptibility by studies of their electrooptical response in the SmA* phase. In particular DSi3-AC11 containing two mesogens interconnected by a siloxane spacer presented a critical exponent gamma as high as 1.97, indicating a practically pure de Vries behavior Temperature-dependent X-ray analysis revealed that the three materials underwent a small layer shrinkage at the SmA*-SmC* transition.

electrooptics

smectic A

de Vries

phase structure

siloxane liquid crystal

Författare

M. Reihmann

Universita di Pisa

A. Crudeli

Universita di Pisa

C. Blanc

Universite de Montpellier

V. Lorman

Universite de Montpellier

Y. P. Panarin

Dublin Institute of Technology

Trinity College Dublin

J. K. Vij

Trinity College Dublin

Nils Olsson

Chalmers, Institutionen för kemiteknik och miljövetenskap

G. Galli

Universita di Pisa

Ferroelectrics

0015-0193 (ISSN)

Vol. 309 111-119

Ämneskategorier

Övrig annan teknik

Materialkemi

Annan materialteknik

Organisk kemi

DOI

10.1080/00150190490510050