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Titolo:
Effect of surface stiffness on the friction of sliding model hydroxylated alpha-alumina surfaces
Autore:
Mann, DJ; Zhong, LJ; Hase, WL;
Indirizzi:
Wayne State Univ, Dept Chem, Detroit, MI 48202 USA Wayne State Univ Detroit MI USA 48202 v, Dept Chem, Detroit, MI 48202 USA Wayne State Univ, Inst Comp Sci, Detroit, MI 48202 USA Wayne State Univ Detroit MI USA 48202 nst Comp Sci, Detroit, MI 48202 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 48, volume: 105, anno: 2001,
pagine: 12032 - 12045
SICI:
1520-6106(200112)105:48<12032:EOSSOT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-DYNAMICS SIMULATIONS; ATOMIC-SCALE FRICTION; QUARTZ-CRYSTAL MICROBALANCE; NANO-ELASTOHYDRODYNAMICS; DIAMOND SURFACES; FORCE MICROSCOPY; ADSORBED LAYERS; OXIDE SURFACE; LUBRICATION; DEPENDENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Hase, WL Wayne State Univ, Dept Chem, Detroit, MI 48202 USA Wayne State Univ Detroit MI USA 48202 hem, Detroit, MI 48202 USA
Citazione:
D.J. Mann et al., "Effect of surface stiffness on the friction of sliding model hydroxylated alpha-alumina surfaces", J PHYS CH B, 105(48), 2001, pp. 12032-12045

Abstract

Molecular dynamics simulations were performed to determine how interfacialproperties and friction forces of two model hydroxylated alpha -alumina surfaces are affected by softening or stiffening the surface potential, without changing the surface-surface intermolecular potential V-inter. The surface-surface vibrational spectrum for the soft surface, in absence of appliedload, is influenced by coupling between V-inter and the surface vibrations. For the stiff surface, this coupling becomes important as the applied load is increased. Friction forces for the stiff and soft surfaces are similarat low loads, but at high loads the stiff surface has higher friction forces. This result mirrors the surface-surface vibrational spectra for the soft and stiff surfaces versus load. Increasing the load forces both systems into potential energy wells, requiring additional energy (or external force)to surmount potential energy barriers for sliding, leading to enhanced friction, At high sliding velocity, the instantaneous barriers and friction forces for sliding do not mirror the periodicity of the optimized interfacialpotential. As the sliding velocity is decreased, there is a longer time available for structural relaxations and energy transfer between the sliding coordinate and surface modes. As a result, the friction force versus sliding distance begins to exhibit the periodicity of the optimized interfacial potential. Knowledge of the optimized potential along the sliding coordinate(analogous to a reaction path potential) may assist in understanding tribological behavior under applied load and interfacial sliding.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 04:39:43