TY - JOUR
T1 - Resonance shear measurement of confined alkylphenyl ether lubricants
AU - Watanabe, Junichi
AU - Mizukami, Masashi
AU - Kurihara, Kazue
N1 - Funding Information:
Acknowledgments This work was supported by the ‘‘Green Tribology Innovation Network’’ in the area of Advanced Environmental Materials of Green Network of Excellence (GRENE) program and ‘‘Ultra-low Friction Technology Area’’ in the Tohoku Innovative Materials Technology Initiatives for Reconstruction from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
Publisher Copyright:
© 2014 Springer Science+Business Media New York.
PY - 2014/11/20
Y1 - 2014/11/20
N2 - The tribological properties of four phenyl ether lubricants, monoalkydiphenyl ether (MADE), dialkyldiphenyl ether (DADE), m-phenoxyphenoxy m-biphenyl (m-4P2E), and m-bis(m-phenoxyphenoxy) benzene (m-5P4E), confined between mica surfaces have been investigated using the resonance shear measurement (RSM). The RSM study revealed that the viscous parameter of these lubricants increased when they were confined in a nano-space. The viscous parameter b 2 values of these lubricants confined in a gap smaller than ca. 2-3 nm were in the order of MADE > DADE > m-4P2E ≈ m-5P4E, while their bulk viscosities were in the order of m-5P4E > m-4P2E > DADE > MADE. Further, the MADE, which has better hydrodynamic lubrication property because of the lowest bulk viscosity, was relatively easily squeezed out from the gap compared to others. These results have demonstrated that phenyl ether lubricants confined in a nano-space behave quite differently from those of the bulk phase, and the direct characterization of confined lubricants is imperative for designing efficient lubricants, especially for boundary lubrication.
AB - The tribological properties of four phenyl ether lubricants, monoalkydiphenyl ether (MADE), dialkyldiphenyl ether (DADE), m-phenoxyphenoxy m-biphenyl (m-4P2E), and m-bis(m-phenoxyphenoxy) benzene (m-5P4E), confined between mica surfaces have been investigated using the resonance shear measurement (RSM). The RSM study revealed that the viscous parameter of these lubricants increased when they were confined in a nano-space. The viscous parameter b 2 values of these lubricants confined in a gap smaller than ca. 2-3 nm were in the order of MADE > DADE > m-4P2E ≈ m-5P4E, while their bulk viscosities were in the order of m-5P4E > m-4P2E > DADE > MADE. Further, the MADE, which has better hydrodynamic lubrication property because of the lowest bulk viscosity, was relatively easily squeezed out from the gap compared to others. These results have demonstrated that phenyl ether lubricants confined in a nano-space behave quite differently from those of the bulk phase, and the direct characterization of confined lubricants is imperative for designing efficient lubricants, especially for boundary lubrication.
KW - Confined space
KW - Lubricants
KW - Phenyl ether
KW - Resonance shear measurement
KW - Tribology
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U2 - 10.1007/s11249-014-0427-8
DO - 10.1007/s11249-014-0427-8
M3 - Article
AN - SCOPUS:84918813714
SN - 1023-8883
VL - 56
SP - 501
EP - 508
JO - Tribology Letters
JF - Tribology Letters
IS - 3
ER -