Abstract
We study the elastic properties of thermotropic smectic liquid crystals withfocal conic domains (FCDs). After the application of the controlled preshearat different temperatures, we independently measure the shear modulusG′ and theFCD size L. We find out that these quantities are related by the scaling relationG′≈γeff/L, whereγeff is the effective surface tension of the FCDs. The experimentally obtained value ofγeff shows the same scaling as the effective surface tension of the layered systems , where K and B are the bending modulus and the layer compression modulus, respectively. The similarity ofthis scaling relation to that of the surfactant onion phase suggests an universal rheologicalbehavior of the layered systems with defects.
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