First Observation of a Thermal Contraction-Type Phase Transition in A-T-Isobars of Monolayers at the Air/Water Interface with Temperature Increase

Article abstract of DOI:10.1246/cl.1992.565

A-T-isobars of octadecylurea monolayers were measured.This is the first direct observation that the monolayers exhibited a first-order phase transition accompanying discontinuous molecular area contraction with increasing temperature.This may be due to the "fusion" of a hydrogen bonded bulky structure of urea head groups in the monolayers at the water surface.