The Tribological Properties of a New Cyclotriphosphazene-Terminated Perfluoropolyether Lubricant

Waltman, R. J.; Kobayashi, N.; Shirai, Kenji; Khurshudov, Andrei; Deng, Haijun

doi:10.1023/b:tril.0000009725.94292.16

Cited by 21 publications

(12 citation statements)

References 23 publications

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“…In contrast, lubricant IDL2 showed a moderate mobility of 0.30. Our results are somewhat consistent with a reported cyclotriphosphazene‐terminated PFPE lubricant, which exhibits relatively immobile behaviour with respect to the Z‐DOL type lubricants . The moderate mobility of IDL2 might be originated from its dendritic geometry.…”

Section: Resultssupporting

confidence: 92%

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Wang

Tan

Cho

et al. 2016

Lubrication Science

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A novel hard disk lubricant IDL2 was synthesised by reacting sodium 4‐((2,2‐dimethyl‐1,3‐dioxolan‐4‐yl)methoxy)phenoate with hexachlorocyclotriphosphazene, followed by treatment with 1H,1H‐perfluoro‐3,6,9‐trioxatridecan‐1‐ol in the presence of sodium hydride and subsequent hydrolysis using sulfuric acid. The chemical structure of IDL2 was confirmed by proton nuclear magnetic resonance (1H NMR), phosphorus‐31 (31P) NMR spectroscopy and mass spectrometer. The thermal property of IDL2 was analysed using thermal gravimetric analysis (TGA) and it shows better thermal stability than two commercial lubricants Z‐DOL and Z‐Tetraol with two and four terminal hydroxy groups, respectively. IDL2 was found to have comparable hydrophobicity to commercial lubricants Z‐DOL, A20H and Z‐Tetraol with water contact angles in the range of 78 – 85°, revealing that IDL2 has analogous surface energy to these commercial lubricants. IDL2 exhibits comparable friction coefficient to A20H and Z‐Tetraol, but much lower than Z‐DOL. More interestingly, it has a much high bonding ratio when compared with commonly used commercial lubricants under the same testing conditions due to the presence of two polar hydroxy groups, which enhance the interaction between lubricant and substrate. These promising properties of IDL2 show that it would be very potential for real application as a hard disk drive lubricant. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 92%

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Wang

Tan

Cho

et al. 2016

Lubrication Science

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“…A Vena VS-90 spin-stand tester was used. After 20 min of on-track flying, the disks were immediately interrogated by an optical surface analyzer (Q-phase image using a Candela Model 6120) and the lubricant mogul thicknesses were subsequently quantified [13]. Four disk surfaces per lubricant film thickness were measured.…”

Section: Methodsmentioning

confidence: 99%

The Effect of PFPE Film Thickness and Molecular Polarity on the Pick-Up of Disk Lubricant by a Low-Flying Slider

et al. 2010

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Lubricant pick-up by a low-flying slider is investigated for hydroxyl-terminated perfluoropolyethers as a function of the number of hydroxyl (OH) groups and of film thickness on the surface of finished rigid disks. The total number of hydroxyl (OH) groups per main chain is 2, 4, and 8 for Zdol, Z-Tetraol, and ZTMD, respectively. The amount of disk lubricant that is picked up by the low-flying slider decreases with decreasing PFPE film thickness and increasing number of OH functional groups. The results are discussed in terms of the disjoining pressure characterizing the lubricant film on the disk surface.

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“…The spreading rate was decreased by four to five times on going from hydroxyl to cyclotriphosphazine endgroups with the same PFPE chain length [14]. An extensive investigation of A20H was recently reported by Waltman et al [52]. The dewetting thickness of A20H increased as the 0.62 power of molecular weight.…”

Section: Scanning Microellipsometrymentioning

confidence: 96%

Spreading and dewetting in nanoscale lubrication

Karis

Kim

2005

Tribol Lett

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This article critically reviews the fundamental scientific tools, as well as constructs cohesive schemes for potential applications, relevant to the molecularly-thin liquid film technology. Our focus is to understand the nanoscale dynamic behavior of thin lubricant films, relevant to the emerging field of nanotechnology, especially for achieving durability and reliability in the nanoscale devices. Our goal is to present a unified and hybrid description of perfluoropolyether (PFPE) experiment, mesoscopic interpretation, microscopic simulation tools, and molecular design tools available up to now. The experimentation and theory for the physicochemical properties of ultra-thin PFPE films are used to examine liquid film in the sub-monolayer to multilayer regime. Methods for extracting spreading properties from the scanning microellipsometry (SME) for various PFPE/solid surface pairs and the surface rheological characterization of PFPEs are examined. The interrelationships among SME spreading profiles, rheology, surface energy, and tribology, are given. Mesoscopic theories, including thermodynamics of evaporation and flow, stability analysis, microscale mass transfer, and capillary waves are introduced to describe thin PFPE film dynamics. Estimation of thin film viscosity enhancement from vapor pressure suppression by dispersion force is reviewed. The method for experimental derivation of lubricant spreading profiles from contact angles is summarized. The implications of capillary waves, or thermal fluctuations, at the surface of polymeric lubricant films are also discussed. The lattice-based, simple reactive sphere Monte Carlo (MC) technique for examining the fundamentals of PFPE dynamics is illustrated. An off-lattice based bead-spring MC model is also introduced to capture a detailed internal structure of the PFPE molecules, and the molecular dynamics method is implemented for a full-scale nanostructural analysis of PFPE ultra-thin films. By systematically tuning the endgroup strengths of PFPE, we examined the physicochemical properties for thin liquid films of the various PFPE/solid surface pairings. These tools accurately describe the static and dynamic behavior of ultra-thin liquid films consistent with experimental findings and thus are suitable for examining the fundamental mechanisms of lubrication in nanoscale devices. Application of the next generation head-disk interface design in information storage device is briefly considered.

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The Tribological Properties of a New Cyclotriphosphazene-Terminated Perfluoropolyether Lubricant

Cited by 21 publications

References 23 publications

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

The Effect of PFPE Film Thickness and Molecular Polarity on the Pick-Up of Disk Lubricant by a Low-Flying Slider

Spreading and dewetting in nanoscale lubrication

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