Fiber wobbling method: novel method for measuring rheological properties of molecularly thin liquid films

Author

Fukuzawa, Kenji ; Itoh, Shintaro ; Ando, Takamasa ; Zhang, Hedong ; Mitsuya, Yasunaga

Author_Institution

Micro/Nano-COE, Nagoya Univ., Japan

fYear

2004

fDate

31 Oct.-3 Nov. 2004

Firstpage

255

Lastpage

258

Abstract

A novel method for measuring dynamic shear force at a high shear rate with precise gap control has been developed to clarify the rheological properties of confined perfluoropolyether lubricant. We call this new method "fiber wobbling method". In this method, an optical fiber is used as a probe and measuring amplitude and phase shift of the fiber shearing a lubricant film provides the rheological properties. The fiber wobbling method requires highly sensitive force sensing due to the small shear force generated by thin liquid films. In this paper, we present an outline of the fiber wobbling method and a highly sensitive shear force measurement method that can provide a minimum detection force of the order of 10 pN. The method will be a useful in designing head-disk interfaces of high-density hard disk drives.

Keywords

liquid films; lubricants; optical fibres; polymers; rheology; confined perfluoropolyether lubricant; dynamic shear force; fiber wobbling method; head-disk interfaces; high-density hard disk drives; minimum detection force; molecularly thin liquid films; optical fiber; rheological properties; Force control; Force measurement; Hard disks; Lubricants; Optical fibers; Optical films; Phase measurement; Probes; Rheology; Shearing;

fLanguage

English

Publisher

ieee

Conference_Titel

Micro-Nanomechatronics and Human Science, 2004 and The Fourth Symposium Micro-Nanomechatronics for Information-Based Society, 2004. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8607-8

Type

conf

DOI

10.1109/MHS.2004.1421313

Filename

1421313