A simple globular-shaped liquid (octamethylcyclotetrasiloxane, OMCTS) was placed between two solid plates at variable spacings comparable to the size of this molecule and the linear she viscoelasticity of the confined interfacial film was measured. Strong monotonic increase of the she relaxation time, elastic modulus, and effective viscosity were observed at spacings less than about 10 molecular dimensions. Frequency dependence showed good superposition at different film thickness. The observed smooth transition to solidity is inconsistent with a first-order transition from but fluid to solidity.
ASJC Scopus subject areas
- General Physics and Astronomy