Highly Swollen Adsorption Layer Formed by Polymeric Friction Modifier Providing Low Friction at Higher Temperature

Modification of boundary lubrication by oil-soluble friction modifier additives

Yingxi Zhu, Hiroko Ohtani , Michael L. Greenfield, Marina Ruths, and Steve Granick Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801 USA Physical and Environmental Sciences Department, Ford Research and Advanced Engineering, Dearborn, Michigan, 48121 USA Department of Chemical Engineering, University of Rhode Island, Kingston, Rhode Island 02881 Dep...

Low temperature internal friction of diamond-like carbon films

We have studied the internal friction of amorphous diamond-like carbon films prepared by pulsed-laser deposition from 0.4 to 300K. The low temperature internal friction below 10K is dominated by the atomic tunnelling states for amorphous solids, which is a measure of structure disorder. We have tried to vary the content of sp carbon atoms versus sp ones by changing laser fleunce, by doping with...

WS2 Nanoparticles - Potential Replacement for ZDDP and Friction Modifier Additives

In high-pressure, high-temperature sliding contacts, WS2 nanoadditives react with the metal substrate to generate 100+ nm chemical tribofilms with a layered structure and excellent tribological properties. The friction, wear and micromechanical properties of WS2 tribofilms are compared with those of tribofilms formed by the zinc dialkyldithiophosphate (ZDDP) antiwear additive and ZDDP-organic f...

Semidiurnal Tidal Motions in the Friction Layer

The obscrved semidiurnal wind in the troposphere at five niid-latmit,ude stations shows a, phase lead over the wind dcduccd from frictionlcss theory, and a smaller amplitude, espccially near the earth’s surface, than the theoretical value. By making use of the obscrved fact that the tidal pressure-dependent (frictionless) wind changes much less rapidly with height than does the observed wiiid i...

Boundary-layer friction in midlatitude cyclone