Magnetic-field-induced changes of the isotropic-nematic phase transition in side-chain polymer liquid crystals.
The isotropic-nematic (I-N) phase transition of side-chain polymer liquid crystals is intrinsically a weak first-order transition with a biphasic region spread over a wide temperature interval. In the presence of high magnetic fields we find the I-N transition to become a strong first order. The I-N biphasic region shrinks its temperature window as larger magnetic fields are applied, until it completely disappears and the transition completes at a fixed temperature. We interpret this behavior as a consequence of the nonlinear coupling of the magnetic field to the system free energy, via the suppression of the order fluctuations in the nematic mesophase at the I-N transition crossing.
Boamfa
M I
MI
Research Institute for Materials, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands. boamfa@sci.kun.nl
Viertler
K
K
Wewerka
A
A
Stelzer
F
F
Christianen
P C M
PC
Maan
J C
JC