Fabrication and Characterization of Carbon Nanotube/Poly(vinyl alcohol) Composites

✍ Scribed by Milo S. P. Shaffer; Alan H. Windle

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 306 KB
• Volume: 11
• Category: Article
• ISSN: 0935-9648
• DOI: 10.1002/(sici)1521-4095(199908)11:11<937::aid-adma937>3.0.co;2-9

✦ Synopsis

sults. Notably, a COF of 0.19 was obtained, which is similar to the COF obtained for IFs/tetradecane, reflecting the dominant role of the WS 2 transfer layers formed in situ during sliding in this system.

In conclusion, we have used the surface forces apparatus to characterize the normal and lateral forces of WS 2 IFs dispersed in tetradecane and confined between mica surfaces. The IFs particles were found to be present between the surfaces even at very high pressures, to minimize adhesion, and to decrease the friction coefficient of mica surfaces lubricated with tetradecane by at least 35 %. The mechanism of friction and wear reduction was shown to involve in situ deposition of highly oriented, ultrathin WS 2 layers without exposure to the ambient air. While further studies are required to investigate the relevance to more general metal and ceramic surfaces, the results of this work point out potential advantages of friction-induced material transfer from IF additives as an efficient method for specific and localized deposition of oriented solid lubricant films in shearing contacts.