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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Abstract
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.
| Item Type: | Article |
|---|---|
| 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 |
| Record Number: | CaltechAUTHORS:KEMprl03 |
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:KEMprl03 |
| Alternative URL: | http://dx.doi.org/10.1103/PhysRevLett.90.115501 |
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
| ID Code: | 1709 |
| Collection: | CaltechAUTHORS |
| Deposited By: | Archive Administrator |
| Deposited On: | 13 Feb 2006 |
| Last Modified: | 26 Dec 2012 08:45 |
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