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|Title:||Enhanced Elasticity and Soft Glassy Rheology of a Smectic in a Random Porous Environment|
Colby, Ralph H.
Harden, James L.
Leheny, Robert L.
|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.|
|Copyright:||2005 American Physical Society|
|Appears in Collections:||Research Papers (SCM)|
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