Measurement of thickness of molecularly thin lubricant film by using ellipsometric microscopy

2005 ◽  
Author(s):  
K. Fukuzawa ◽  
T. Shimuta ◽  
A. Nakada ◽  
Hedong Zhang ◽  
Y. Mitsuya
Keyword(s):  
Lubricant Film ◽  
Molecularly Thin Lubricant ◽  
Measurement Of Thickness

Measurement of thickness of molecularly thin lubricant film using ellipsometric microscopy

2005 ◽  
Vol 41 (2) ◽  
pp. 808-811 ◽  
Author(s):  
K. Fukuzawa ◽  
T. Shimuta ◽  
A. Nakada ◽  
Hedong Zhang ◽  
Y. Mitsuya
Keyword(s):  
Lubricant Film ◽  
Molecularly Thin Lubricant ◽  
Measurement Of Thickness

High-Speed Friction Measurements for a Molecularly Thin Lubricant Film Using a Fiber Wobbling Method

2012 ◽  
Vol 48 (11) ◽  
pp. 4467-4470 ◽  
Author(s):  
Shintaro Itoh ◽  
Kenji Fukuzawa ◽  
Koki Imai ◽  
Koki Ishii ◽  
Hedong Zhang
Keyword(s):  
High Speed ◽  
Lubricant Film ◽  
Molecularly Thin Lubricant ◽  
Friction Measurements

Measurement of Disjoining Pressure of a Molecularly Thin Lubricant Film by Using a Microfabricated Groove

2004 ◽  
Vol 40 (4) ◽  
pp. 3183-3185 ◽  
Author(s):  
K. Fukuzawa ◽  
J. Kawamura ◽  
T. Deguchi ◽  
H. Zhang ◽  
Y. Mitsuya
Keyword(s):  
Disjoining Pressure ◽  
Lubricant Film ◽  
Molecularly Thin Lubricant

Effects of Mobile and Chemically Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2004 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Direct Contact ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant ◽  
The Stability

Lubrication by an extremely thin film has become very important in micro machines, magnetic recording disks and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and chemically bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that chemically bonded molecules prevent direct contact between the slider and the disk surface. Furthermore, when mobile molecules exist on bonded molecules, the stability is improved in wide load range.

Effects of Mobile and Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2005 ◽  
Vol 128 (1) ◽  
pp. 176-180 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant

Lubrication by an extremely thin film has become very important in micromachines, magnetic recording disks, and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that both mobile and bonded molecules exist on the disk surface, the bouncing vibration of the sliding ball can be reduced wide load range. In the case where only mobile or only bonded molecules exists, there is little effect on the bouncing vibration.

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