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http://hdl.handle.net/2289/4028
Title: | Splay and bend elastic constants in the nematic phase of some disulfide bridged dimeric compounds |
Authors: | Kundu, Brindaban Pal, Santanu Kumar Kumar, Sandeep Pratibha, R. Madhusudana, N.V. |
Issue Date: | 10-Dec-2010 |
Publisher: | American Physical Society |
Citation: | Physical Review E, 2010, Vol.82, p061703 |
Abstract: | We report measurements of the temperature dependences of the splay (K11) and bend (K33) elastic constants of several homologues and a binary mixutre of disulfide bridged symmetric dimers made of alkoxy cyanobiphenyl monomeric units. All of them have an even number m of carbon and sulfur atoms in the linking chain and expected to have linear conformations. Both K11 and K33 alternate depending on the parity of x which is the number of carbon atoms in the alkyl chain of a monomer. We will refer to this as ‘odd-even' effect. This effect, occurs near the nematic-isotropic transition temperature. TNI , but monotonically decrease with m at lower temperatures. We argue that these results imply large rotational fluctuations of the two halves of the dimers about the S-S bond giving rise to average bent conformations near TNI . At lower temperatures those conformations which can adapt better to the given curvature deformation in the medium are favored. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/4028 |
ISSN: | 1550-2376 (Online) 1539-3755 |
Alternative Location: | http://dx.doi.org/10.1103/PhysRevE.82.061703 http://adsabs.harvard.edu/abs/2010PhRvE..82f1703K |
Copyright: | 2010 American Physical Society |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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2010_PRE_82_061703.pdf | Open Access. | 327.43 kB | Adobe PDF | View/Open |
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