ORIENTATIONALLY ORDERED LAYERS OF SATURATED-HYDROCARBONS AND THEIR DERIVATIVES ON QUARTZ SURFACES

The structure of the adjacent-to-wall layers of aliphatic hydrocarbons on quartz surface was investigated. Measurements of dichroism of the dyestuff molecules, or ''guest'' in the matrix of the basic substance, allowed establishing the presence of the orientational ordering in li quid layers at distances up to 200 nm. Additional measurements of the optical anisotropy (birefringence) in such layers have substantiated t he existence of that ordering and its type. The structural characteris tics of the adjacent-to-wall layers, such as thickness, type, and degr ee of the orientational ordering of molecules depend on the specific h ydrocarbon used and the preparation (modification) of the surface of t he solid substrate. (C) 1992 Academic Press, Inc.