Spreading characteristics of novel cyclotriphosphazine-terminated Perfluoropolyether (PFPE) films on carbon surfaces were investigated experimentally by using a scanning micro-ellipsometer. The apparent diffusion coefficients of novel lubricants were also studied in order to evaluate the spreading speed and they were compared with the conventional Zdol. It was found that the mobility of cyclotriphosphazine-terminated PFPE films is lower than that of Zdol. This characteristics is dependent on the interactions between the end groups of the lubricants and carbon surfaces and it is found that the tendency of “work of adhesion” for the lubricants has a good correlation with the mobility tendency of the lubricants. In addition, the monolayer film thickness of novel lubricant films as well as conventional Zdol was identified, which was extracted using Matano interface method. As a result, the existing conformation of novel cyclotriphosphazine-terminated PFPE film on carbon surfaces could be estimated, based on the monolayer film thickness results.

Issue Section:
Research Papers
Keywords:
polymer films, monolayers, diffusion, lubricants, ellipsometry, disc drives, hard discs, Hard Disk Drives, Head-Disk Interface, Cyclotriphosphazine-Terminated PFPE Lubricant, Spreading Characteristics, Monolayer Film Thickness, Scanning Micro-Ellipsometry
Topics:
Carbon, Diffusion (Physics), Disks, Film thickness, Lubricants, Mechanical admittance, Adhesion
1.
Menon, A. K., 1999, “Critical Requirement for 100 Gb/in2 Head/Media Interface,” Proceeding of the Symposium on Interface Technology Toward 100 Gb/in2, TRIB-Vol. 9, pp. 1–9.
2.
Novotny
,
V. J.
,
1990
, “
Migration of Liquid Polymers on Solid Surfaces
,”
J. Chem. Phys.
,
92
, pp.
3189
–
3196
.
3.
Min
,
B. G.
,
Choi
,
J. W.
,
Brown
,
H. R.
,
Yoon
,
D. Y.
,
O’Connor
,
T. M.
, and
Jhon
,
M. S.
,
1995
, “
Spreading Characteristics of Thin Liquid Films of Perfluoropolyalkylethers on Solid Surfaces: Effect of Chain-End Functionality and Humidity
,”
Tribol. Lett.
,
1
, pp.
225
–
232
.
4.
O’Connor
,
T. M.
,
Jhon
,
M. S.
,
Bauer
,
C. L.
,
Min
,
B. G.
,
Yoon
,
D. Y.
, and
Karis
,
T. E.
,
1995
, “
Surface Diffusion and Flow Activation Energies of Perfluoropolyalkylether
,”
Tribol. Lett.
,
1
, pp.
219
–
223
.
5.
Ma
,
X.
,
Gui
,
J.
,
Smoliar
,
L.
,
Grannen
,
K.
,
Marchon
,
B.
,
Jhon
,
M. S.
, and
Bauer
,
C. L.
,
1999
, “
Spreading of Perfluoropolyalkylether Films on Amorphous Carbon Surfaces
,”
J. Chem. Phys.
,
110
, pp.
3129
–
3137
.
6.
Tyndall
,
G. W.
,
Karis
,
T. E.
, and
Jhon
,
M. S.
,
1999
, “
Spreading Profiles of Molecularly Thin Perfluoropolyether Films
,”
Tribol. Trans.
,
42
(
3
), pp.
463
–
470
.
7.
Ma
,
X.
,
Gui
,
J.
,
Smoliar
,
L.
,
Grannen
,
K.
,
Marchon
,
B.
,
Jhon
,
M. S.
, and
Bauer
,
C. L.
,
1999
, “
Complex Terraced Spreading of Perfluoropolyalkylether Films on Carbon Surfaces
,”
Phys. Rev. E
,
59
, pp.
722
–
727
.
8.
Ma, X., 1998, “Spreading of Perfluoropolyalkylether Films on Amorphous Carbon Surfaces,” Ph.D. thesis, Carnegie Mellon University.
9.
Xu
,
L.
,
Ogletree
,
D. F.
,
Salmeron
,
M.
,
Tang
,
H.
,
Gui
,
J.
, and
Marchon
,
B.
,
2000
, “
De-Wetting of Lubricants on Hard Disks
,”
J. Chem. Phys.
,
112
, pp.
2952
–
2957
.
10.
Matano
,
C.
,
1933
, “
On the Relation Between the Diffusion-Coefficient and Concentrations of Solid Metals
,”
Japan. J. Phys.
,
8
, pp.
109
–
113
.
Copyright © 2004
 by ASME
You do not currently have access to this content.