Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
3860677
Reference Type
Journal Article
Title
ADSORPTION AND CONFIGURATION OF LUBRICANT MOLECULES ON OVERCOAT MATERIALS
Author(s)
Yanagisawa, M
Year
1993
Is Peer Reviewed?
1
Journal
Wear
ISSN:
0043-1648
EISSN:
1873-2577
Volume
168
Issue
1-2
Page Numbers
167-173
DOI
10.1016/0043-1648(93)90213-6
Web of Science Id
WOS:A1993LX98500026
Abstract
Perfluoropolyethers (PFPEs) have been widely used as an excellent lubricant on magnetic disks. Sol-gel SiO2 has been applied as a protective overcoat for plated magnetic disks. Adsorption of PFPEs on a surface of the protective overcoat is an important issue to evaluate lubrication characteristics, such as coefficient of friction, wear resistance, volatility and spin-off, for magnetic disks. Molecular configuration and magnitude of adsorption between lubricants and protective overcoats were measured using various analytical methods: diffuse reflectance IR spectroscopy, polarization reflection IR spectroscopy, refractive index analysis, flow microcalorimetry etc. Functional groups in PFPE molecules adsorb to silanol groups on the sol-gel SiO2 surface. The main chain of the PFPE molecule orients parallel to the sol-gel SiO2 surface. The thickness of adsorbed PFPE agrees well with the diameter of the PFPE main chain. The heat of adsorption increases with increasing hydrophilic affinity of functional groups. The heat of adsorption decreases with increasing baking temperature of sol-gel SiO2, which corresponds to the decrease in silanol group density.
Tags
PFAS
•
Expanded PFAS SEM (formerly PFAS 430)
Perfluoropentanesulfonate
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFPeS (2706-91-4)
Literature Search
WOS
•
PFPeS
Literature Search
WOS
Screening Results
Excluded/Not on Topic
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity