title: Crystal bridges, tetratic order, and elusive equilibria: the role of structure in lubrication films.
abstract: In this paper, we report on molecular dynamics simulation studies of thin dodecane films confined between mica surfaces. On confinement, the film undergoes a surface-mediated transition into a novel phase characterized by tetratic orientational order. The rheology of this ordered film is governed by slip planes and, at low shear rates, stick-slip behavior observable under steady shear rates. Melting of these films was observed either on heating or on exceeding a critical shear rate. Evidence is presented that this tetratic film is not the true equilibrium state; rather, a state characterized by nematic order and very low viscosities is found to be more stable.
authors: School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia.
authors: A
authors: A
authors: Jabbarzadeh
authors: Peter
authors: P
authors: Harrowell
authors: R I
authors: RI
authors: Tanner