The aim is to measure the preferential adsorption of one component in a nematic mixture. The base is 4-pentyl 4¿- cyanobiphenyl (5CB) and it is doped with 4-pentyl 4¿- cyanoterphenyl (5CT). The aim of this proposal is to measure the adsorption of 5CT at interfaces between a 5CB/5CT mixture and solid alignment layers. Temperature and concentration will be varied to determine the free energy and enthalpy of adsorption. Preliminary data has indicated adsorption can be detected by neutron reflection, confirming feasibility of the proposed measurements. A long term aim is to investigate the effect of liquid crystals in confinement, between two interfaces with conflicting alignment properties. We therefore wish to make the 5CT absorption measurements using three types of alignment layer with different director anchoring properties.