Kempe, M. D. and Kornfield, J. A. (2003) Shear Alignment Behavior of Nematic Solutions Induced by Ultralong Side-Group Liquid Crystal Polymers. Physical Review Letters, 90 (11). Art. no. 115501. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:KEMprl03
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Addition of a low concentration of a very long (430 kg/mol) side group liquid crystal polymer is shown to produce dramatic changes in the flow characteristics of a calamitic nematic liquid crystal. This polymer causes a typical flow-aligning nematic liquid crystal to align near the velocity gradient direction rather than near the velocity direction, corresponding to having a tumbling parameter lambda<–1, for concentrations greater than 7.5% polymer. Such flow-aligning behavior has not been reported previously in a calamitic nematic. The large molecular weight of the present polymer relative to those examined in the prior literature is responsible for these new phenomena.
|Additional Information:||©2003 The American Physical Society (Received 10 October 2002; published 17 March 2003) We thank Chris Ober and Jagdish Jethalamari for help with synthesis,Weijun Zhou for help with instrumentation, and AFOSR LC-MURI for funding for this project.|
|Subject Keywords:||liquid crystal polymers; nematic liquid crystals; shear flow; velocity; molecular weight|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||13 Feb 2006|
|Last Modified:||18 Sep 2014 18:11|
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