Abstract
The transport of organic solutes in 4-(trans-4′-4′-n-pentylcyclohexy)-benzonitrile (PCH5) and 4-cyano-4′-octylbiphenyl (8CB) supported liquid crystal (LC) membranes was reported in order to broaden the understanding of mechanisms for solute transport in ordered mesophases. PCH5 was chosen as it exhibits a lower packing density than 8CB but retains a similar molecular structure. Higher sorption and diffusion coefficients were measured in PCH5 compared to 8CB, due primarily to the lower packing density in the PCH5 nematic phase. Solutes capable of forming a single hydrogen bonding with LC molecules exhibited faster diffusion than those with no hydrogen-bonding ability or those capable of multiple hydrogen-bonding interactions. Measurements of relative solubility of pyridine and salicylic acid in 8CB, PCH5 and kerosene confirmed that intermolecular hydrogen bonding plays a stronger role than π−π interactions in solute absorption. Finally, in the absence of differences in hydrogen bonding, higher dipole–dipole interactions resulted in lower diffusivities in LCs.
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