Ma. Castro et al., SOLID MONOLAYERS ADSORBED AT THE SOLID-LIQUID INTERFACE STUDIED BY INCOHERENT ELASTIC NEUTRON-SCATTERING, JOURNAL OF PHYSICAL CHEMISTRY B, 101(44), 1997, pp. 8878-8882
Incoherent elastic neutron scattering has been used to demonstrate the
presence of an immobile monolayer adsorbed at the interface between l
iquid alkanes (methane, heptane, dodecane), an alkanol (dodecanol), an
d a carboxylic acid (dodecanoic acid) and a graphite substrate. The de
rived areas per molecule in the solid layers are consistent with the m
olecules lying with their long axis parallel to the surface. Ia every
case studied the layers were found to melt approximately 10% higher th
an the melting points of the bulk materials. Diffraction data are used
to confirm the two-dimensional nature of the solid monolayer in the c
ase of methane. In every case there is also evidence for premelting of
the bulk materials as the melting points are approached from below.