The structure factor of the lyotropic liquid-crystal cesium perflouro-octanoate–water after the material has been quenched form the isotropic phase to the nematic phase was found to display non-Porod power-law behavior in the limit of large wave vectors. Our measurements were consistent with the scaling law S(q,t)∼${\mathit{t}}^{\mathrm{-}3/2}$${\mathit{q}}^{\mathrm{-}6}$ for bulk samples and S(q,t)∼${\mathit{t}}^{\mathrm{-}1}$${\mathit{q}}^{\mathrm{-}4}$ for thin samples exhibiting two-dimensional behavior. Dimensional crossover was also observed.

• Received 2 March 1992

DOI:https://doi.org/10.1103/PhysRevLett.68.3583