| Autor: | Paul H. Kasai, Vedantham Raman |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Materials science Mechanical Engineering Metal ions in aqueous solution Carboxylic acid Track (disk drive) Analytical chemistry Surfaces and Interfaces Alkali metal Photochemistry Surfaces Coatings and Films Ion Catalysis chemistry Mechanics of Materials Degradation (geology) Lewis acids and bases |
| Zdroj: | Tribology Letters. 15:15-28 |
| ISSN: | 1023-8883 |
| DOI: | 10.1023/a:1023455921766 |
| Popis: | The degradation of Z-dol catalyzed by Lewis acid centers on the slider surface leads to chain scission forming one type of fragment terminated with a fluorocarbonyl end-group and the other with a trifluoromethoxy end-group. The former, in contact with humid air, converts to a fluorinated carboxylic acid Z-COOH. Z-COOH is an excellent scavenger for alkali or alkaline earth metal ions. Z-COO-M+ thus formed is a strong surfactant, and, in a humid environment, forms microdroplets embodying water in the core. Metal ions thus scavenged on a disk surface can be readily detected by TOF-SIMS, and the microdroplets by optical microscopy in the dark-field mode. The presence of fragments having a trifluoromethoxy end-group on the disk surface can also be established by TOM-SIMS. A careful intensity analysis of peaks due to anions having a trifluoromethoxy end-group permits a semi-quantitative assessment of the extent of degradation. The study has also shown that degradation is caused by such production processes as tape-polishing and by such disk drive operations as the head flying over a single track or over a band in a seek-mode. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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