Creeping friction dynamics and molecular dissipation mechanisms in glassy polymers

被引：95

作者：

Sills, S ^{[1
]}

Overney, RM ^{[1
]}

机构：

[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.91.095501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dissipation mechanism of nanoscale kinetic friction between an atomic force microscopy tip and a surface of amorphous glassy polystyrene has been studied as a function of two parameters: the scanning velocity and the temperature. Superposition of the friction results using the method of reduced variables revealed the dissipative behavior as an activated relaxation process with a potential barrier height of 7.0 kcal/mol, corresponding to the hindered rotation of phenyl groups around the C-C bond with the backbone. The velocity relationship with friction F(v) was found to satisfy simple fluctuation surface potential models with Fproportional toconst-ln(v) and Fproportional toconst-ln(v)(2/3).

引用

收藏

页数：4

相关论文

共 25 条

[1] Molecular dynamics study of scanning force microscopy on self-assembled monolayers [J].

Bonner, T ;

Baratoff, A .

SURFACE SCIENCE, 1997, 377 (1-3) :1082-1086

[2]

Boyer R.F, 1978, MOL BASIS TRANSITION

[3] THE SHEAR PROPERTIES OF LANGMUIR-BLODGETT LAYERS [J].

BRISCOE, BJ ;

EVANS, DCB .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1982, 380 (1779) :389-&

[4] Atomic force microscopy calibration methods for lateral force, elasticity, and viscosity [J].

Buenviaje, CK ;

Ge, SR ;

Rafailovich, MH ;

Overney, RM .

FUNDAMENTALS OF NANOINDENTATION AND NANOTRIBOLOGY, 1998, 522 :187-192

[5] Dynamic force spectroscopy: a Fokker-Planck approach [J].

Dudko, OK ;

Filippov, AE ;

Klafter, J ;

Urbakh, M .

CHEMICAL PHYSICS LETTERS, 2002, 352 (5-6) :499-504

[6]

Ferry D.J., 1980, Viscoelastic Properties of Polymers, V3e

[7] Velocity dependence of atomic friction [J].

Gnecco, E ;

Bennewitz, R ;

Gyalog, T ;

Loppacher, C ;

Bammerlin, M ;

Meyer, E ;

Güntherodt, HJ .

PHYSICAL REVIEW LETTERS, 2000, 84 (06) :1172-1175

[8] Probing polymer viscoelastic relaxations with temperature-controlled friction force microscopy [J].

Hammerschmidt, JA ;

Gladfelter, WL ;

Haugstad, G .

MACROMOLECULES, 1999, 32 (10) :3360-3367

[9] Effect of interfacial liquid structuring on the coherence length in nanolubrication [J].

He, MY ;

Blum, AS ;

Overney, G ;

Overney, RM .

PHYSICAL REVIEW LETTERS, 2002, 88 (15) :4-154302

[10] CREEP, STICK-SLIP, AND DRY-FRICTION DYNAMICS - EXPERIMENTS AND A HEURISTIC MODEL [J].

HESLOT, F ;

BAUMBERGER, T ;

PERRIN, B ;

CAROLI, B ;

CAROLI, C .

PHYSICAL REVIEW E, 1994, 49 (06) :4973-4988