Journal ArticleDOI
Confinement-induced phase transitions in simple liquids.
Jacob Klein,Eugenia Kumacheva +1 more
TLDR
The liquid-to-solid transition of a simple model liquid confined between two surfaces was studied as a function of surface separation and the rigidity of the confined films increased reversibly by at least seven orders of magnitude.Abstract:
The liquid-to-solid transition of a simple model liquid confined between two surfaces was studied as a function of surface separation. From large surface separations (more than 1000 angstroms) down to a separation corresponding to seven molecular layers, the confined films displayed a liquid-like shear viscosity. When the surface separation was further decreased by a single molecular spacing, the films underwent an abrupt, reversible transition to a solid. At the transition, the rigidity of the confined films (quantified in terms of an "effective viscosity") increased reversibly by at least seven orders of magnitude.read more
Citations
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Surface Interaction Forces of Well-Defined, High-Density Polymer Brushes Studied by Atomic Force Microscopy. 1. Effect of Chain Length
TL;DR: In this paper, the authors made direct force measurements by atomic force microscopy (AFM) at surfaces of polymer brushes comprised of low-polydispersity poly(methyl methacrylate) (PMMA) chains densely end-grafted on a silicon substrate by living radical polymerization.
Journal ArticleDOI
Simple liquids confined to molecularly thin layers. II. Shear and frictional behavior of solidified films
Eugenia Kumacheva,Jacob Klein +1 more
TL;DR: In this paper, the authors investigated the mechanical properties of thin layers of cyclohexane and octamethylcyclotetrasiloxane (OMCTS) in the gap between two smooth solid surfaces at discrete thicknesses n=6-3 molecular layers.
Journal ArticleDOI
Adsorption, intrusion and freezing in porous silica: the view from the nanoscale
Benoit Coasne,Benoit Coasne,Benoit Coasne,Anne Galarneau,Roland J.-M. Pellenq,Roland J.-M. Pellenq,Francesco Di Renzo +6 more
TL;DR: This review presents the state of the art of molecular simulation and theory of adsorption, intrusion and freezing in porous silica, and discusses the validity of classical approaches such as the Washburn-Laplace equation and Gibbs-Thomson equation to describe the thermodynamics of intrusion and in-pore freezing.
Journal ArticleDOI
Friction and energy dissipation mechanisms in adsorbed molecules and molecularly thin films
TL;DR: In this article, an overview of recent advances that have been achieved in understanding the basic physics of friction and energy dissipation in molecularly thin adsorbed films and the associated impact on friction at microscopic and macroscopic length scales.
Journal ArticleDOI
Nanotribology : Microscopic mechanisms of friction
Oleg M. Braun,A.G. Naumovets +1 more
TL;DR: In this paper, the state of the art in molecular dynamics simulations of tribological systems is described from the point of view of surface science physicists and the main accent is devoted to recent molecular dynamics results in their connection with experiments.
References
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Surface energy and the contact of elastic solids
TL;DR: In this paper, the influence of surface energy on the contact between elastic solids is discussed and an analytical model for its effect upon the contact size and the force of adhesion between two lightly loaded spherical solid surfaces is presented.
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The friction and lubrication of solids
Frank Philip Bowden,David Tabor +1 more
TL;DR: Tabor and Bowden as mentioned in this paper reviewed the many advances made in this field during the past 36 years and outlined the achievements of Frank Philip Bowden, and reviewed the behavior of non-metals, especially elastomers; elastohydrodynamic lubrication; and the wear of sliding surfaces.
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Slow viscous motion of a sphere parallel to a plane wall—I Motion through a quiescent fluid
TL;DR: Asymptotic solutions of the Stokes equations are derived for both the translational and rotational motions of a sphere parallel to a plane wall bounding a semi-infinite, quiescent, viscous fluid in the limit where the gap width tends to zero as discussed by the authors.
Journal ArticleDOI
Physics of the Granular State
TL;DR: The generation of analogies between the physics found in a simple sandpile and that found in complicated microscopic systems, such as flux motion in superconductors or spin glasses, has prompted a number of new theories and to a new era of experimentation on granular systems.