NDLI: Bonding Mechanism of Perfluoropolyether Lubricant Film with Functional Endgroup on Magnetic Disks by Ultraviolet Irradiation

Content Provider	Springer Nature Link
Author	Tani, H. Kitagawa, H. Tagawa, N.
Copyright Year	2011
Abstract	We studied the bonding mechanism of ultrathin perfluoropolyether (PFPE) lubricant (Fombline Z-tetraol and Moresco D-4OH) films with hydroxyl end groups by measuring the bonding film thickness after ultraviolet (UV) irradiation. Nonfunctional PFPE lubricants (Z-03 and D2 N) were compared to two types of functional PFPE lubricants. The bonded thickness of both functional lubricants increased after a short period of UV irradiation, whereas that of the nonfunctional lubricants did not increase after the same treatment. This result suggests the occurrence of three kinds of mechanisms. First, Z-tetraol and D-4OH bond because of the photodissociation of the end groups by the UV light. Second, they bond because of the interaction between the end groups and the photoelectron from the carbon surface generated by UV irradiation. Third, they bond because of the photodissociation of the main chain by the UV light. In contrast, the dynamic reaction coordinate calculations suggest that the end groups in the PFPE lubricant dissociate because of the electron capture by the lubricant. As a result, we infer that the bonding of PFPE lubricant films with hydroxyl end groups on magnetic disks occurs by selective dissociation of the end groups because of UV irradiation.
Starting Page	117
Ending Page	122
Page Count	6
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	45
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2011-10-02
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetic disk recording Lubrication Perfluoropolyether Ultraviolet irradiation Physical Chemistry Theoretical and Applied Mechanics Tribology, Corrosion and Coatings Nanotechnology Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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