Observation of PFPE lubricant film on magnetic disk surface by atomic force microscopy

Tani, Hiroshi

doi:10.1109/20.800837

Cited by 37 publications

(25 citation statements)

References 8 publications

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“…TEM or XPS measurement reveals that the film thickness of the lubricants is 2-3 nm. According to Tani [7], he found double steps on the lubricant film with 2.9nm thickness that was almost completely cover the surface by the mean molecular radius of gyration with coil of lubricant molecular. Therefore, it seems that the 2-3 coils of lubricant molecular have been stacked on the surface of the ophthalmic lens.…”

Section: Resultsmentioning

confidence: 99%

“…Several investigations of a magnetic disk surface on which PFPE lubricants are present have been carried out by ellipsometry [1][2][3], grazing-angle X-ray reflectivity (XRR) [3], Fourier transform infrared spectroscopy (FT-IR) [3,4], X-ray photoelectron spectroscopy (XPS) [3,5,6], atomic force microscopy (AFM) [1,2,6,7,8], and secondary ion mass spectrometry (SIMS) [6,9,10]. In general, the lubricant thickness or lubricant formation has been evaluated by ellipsometry, XPS, FT-IR, XRR, and SIMS.…”

Section: Introductionmentioning

confidence: 99%

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Application of lubricants structure on ophthalmic lens

Tadokoro

Pannakarn²,

Wisuthtatip³

et al. 2011

JSA

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In this paper, novel approaches to the study of the relationship between the chemical structures and the wear properties of lubricants on an ophthalmic lens by various analytical methods are described. The X-ray damage of lubricants by X-ray photoelectron spectroscopy (XPS) depends upon the lubricant structure. Further, the lubricant structure influences the wear properties. In particular, the experimentally observed X-ray damage and wear properties indicate that the straight linear chain structure with no side chain structure ((-CF 2 -CF 2 -O-)m-(CF 2 -O-)n) is stronger than that with the side chain structure ((-CF (CF 3 )-CF 2 -O-)m). This result suggests that the investigation of X-ray damage by XPS is equivalent to an examination of the strength of the wear characteristic. The abovementioned methods are suitable for studying the durability of lubricants on ophthalmic lenses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of lubricants structure on ophthalmic lens

Tadokoro

Pannakarn²,

Wisuthtatip³

et al. 2011

JSA

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“…In recent years, further value-adds have been made to plastic lenses, with the use of lubricants in the top layers for increasing durability, preventing contamination due to scratches on spectacle lenses, and facilitating "easy removal" of dirt. Research on lubricants used for the improvement of tribology characteristics has progressed rapidly; it has been supported from the end of the 1980s by the development of surface analysis methods (Kimachi et al, 1987;Mate et al, 1989;Novotny et al, 1989;Newman et al, 1990;Mate et al, 1991;Toney et al, 1991;Novotny et al, 1994;Sakane et al, 1999;Tani, 1999;Tadokoro et al, 2001;Tadokoro et al, 2003) and by the technology for high-density magnetic disc recording used in personal computers. The main lubricant selected was perfluoropolyether (PFPE), because it possesses thermal stability, oxidation stability, low vapor pressure, low surface tension, and good boundary lubricity.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Lubricant on Ophthalmic Lenses

Tadokoro¹

2011

Tribology - Lubricants and Lubrication

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“…Therefore, to reduce this disturbance, the probe was coated with fluoride [6]. The fluoride coating material used was FC-722 provided by 3M Co.; it is a perfluoro acrylate homo polymer that is a discontinued product.…”

Section: Afm Observationmentioning

confidence: 99%

Electric Field Assisted Dip-coating Process of Ultra-thin PFPE Lubricant Film on Magnetic Disks

Tani

Kubota

Kanda

et al. 2010

JAMDSM

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The influence of an electric field on the dip-coating process was studied by using the lubricants Z-tetraol, D-4OH, TA-30, and QA-40. The electric field facilitated the adsorption of lubricant molecules onto the disk surface. It also resulted in an increase in the lubricant film thickness. The surface free energy and molecular height of the Z-tetraol lubricant film were not affected by the electric field; however, they decreased in the case of other lubricant films. To elucidate these results, we estimated that the molecular conformation of the lubricants changed due to the electric field and that the OH end-groups aligned to the carbon surface. These results suggest the possibility of resistance to outgas contamination and humidity through electric field assisted dip (EFAD) coating.

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Observation of PFPE lubricant film on magnetic disk surface by atomic force microscopy

Cited by 37 publications

References 8 publications

Application of lubricants structure on ophthalmic lens

Application of lubricants structure on ophthalmic lens

Characterization of Lubricant on Ophthalmic Lenses

Electric Field Assisted Dip-coating Process of Ultra-thin PFPE Lubricant Film on Magnetic Disks

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