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Title: | Enhanced Elasticity and Soft Glassy Rheology of a Smectic in a Random Porous Environment |
Authors: | Bandyopadhyay, Ranjini Liang, Dennis Colby, Ralph H. Harden, James L. Leheny, Robert L. |
Issue Date: | 2005 |
Publisher: | American Physical Society |
Citation: | Physical Review Letters, 2005, Vol.94, p107801 |
Abstract: | We report studies of the frequency dependent shear modulus, $G^*(\omega)=G'(\omega)+iG''(\omega)$, of the liquid crystal octylcyanobiphenyl (8CB) confined in a colloidal aerosil gel. With the onset of smectic order, $G'$ grows approximately linearly with decreasing temperature, reaching values that exceed by more than three orders of magnitude the values for pure 8CB. The modulus at low temperatures possesses a power-law component, $G^*(\omega) \sim \omega^\alpha$, with exponent $\alpha$ that approaches zero with increasing gel density. The amplitude of $G'$ and its variation with temperature and gel density indicate that the low temperature response is dominated by a dense population of defects in the smectic. In contrast, when the 8CB is isotropic or nematic, the modulus is controlled by the elastic behavior of the colloidal gel. |
Description: | Open Access. |
URI: | http://hdl.handle.net/2289/4646 |
ISSN: | 0031-9007 1079-7114 (Online) |
Alternative Location: | http://arxiv.org/abs/cond-mat/0502454 http://dx.doi.org/10.1103/PhysRevLett.94.107801 |
Copyright: | 2005 American Physical Society |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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2005_PhysRevLett_V94_p107801.pdf Restricted Access | Open Access | 235.12 kB | Adobe PDF | View/Open Request a copy |
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