Alkyl Chain Length Effect on Tribological Behavior of Alkanethiol Self-Assembled Monolayers on Au

Nakano, Miki; Ishida, Takao; Numata, Toshimitsu; Ando, Yasuhisa; Sasaki, Shinya

doi:10.1143/jjap.42.4734

Cited by 26 publications

(20 citation statements)

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“…0.15 over the entire range of speed for all three samples (two SAM films and bare gold substrate). Although some previous macrotribological studies using a rigid slider have revealed alkyl-chain-length-dependent frictional properties of SAMs, this distinction was possible only under a load of a few mN [20].…”

Section: Elastomeric Sliding Contact On the Sam Films On A Macroscopimentioning

confidence: 91%

“…Spectroscopic examination of the sliding track by PM-IRRAS clearly verified that the SAM films retain their ordered structure following the tribostress provided by the elastomeric slider. Analysis of the sliding track that has received the tribological stress is common practice in macrotribological studies of SAM films [20,21,24]; however, it was even easier when an elastomer was employed as the sliding partner because of the larger contact area achieved at the elastomeric interface. It should be emphasized that the spatially resolved PM-IRRAS measurements presented here were simply measured by positioning different regions of the sample in the beam path under normal sampling conditions and, therefore, the spectra presented above as ''inside'' the wear track do not completely exclude the beam sampling some of the area outside the track, as well.…”

Section: Pm-irras Studies On the Sliding Trackmentioning

confidence: 99%

“…This is important in that tribological stress could be applied exclusively onto the SAM films, i.e., without penetrating to the underlying substrate, and thus their tribological properties as boundary-lubricant films can be probed. In contrast, tribological contacts involving SAM films probed by more conventional, macroscale approaches, such as pin-on-disk tribometry [19][20][21][22][23][24], have generally resulted in irreversible damage to the samples, both the SAM films and the supporting substrates, which renders the interpretation of the observed tribological properties far more complicated.…”

Section: Introductionmentioning

confidence: 99%

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Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

et al. 2007

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We demonstrate that the frictional properties of alkanethiol self-assembled monolayers (SAMs) with various surface-chemical and structural features can be investigated on a macroscopic scale by employing an elastomer as the sliding partner in pin-on-disk tribometry. The mild contact conditions at the elastomeric tribological interface allow the SAM films to remain virtually intact despite the tribological stress. Sliding contact between SAMs and elastomers over the speed range available from an ordinary tribometer in a liquid environment induced a broad range of lubrication mechanisms, ranging from boundary to fluid-film lubrication regimes. Thus, the impact of both the chemical and structural characteristics of SAMs on the formation of fluid films and interfacial friction forces could be probed in the absence of wear processes. Given the large SAM ''toolbox'' that is readily available for the modification of surface-chemical characteristics, this approach provides an opportunity to investigate the influence of surface chemistry on the frictional properties of elastomeric tribological contacts.

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Section: Elastomeric Sliding Contact On the Sam Films On A Macroscopimentioning

confidence: 91%

Section: Pm-irras Studies On the Sliding Trackmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

et al. 2007

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“…Another reason is that the SAM formation process on Au substrates is easier than that on other substrates such as silicon made from organosilianol compounds. For example, the authors have investigated the tribological behavior of organosulfur molecule SAMs on Au using a pin-on-plate method [13][14][15]. In our previous study, we found that the friction coefficients were dependent on the alkyl chain length and that even a monolayer film was sufficiently durable against friction, although the friction coefficients were slightly high at 0.2 to 0.4.…”

Section: Introductionmentioning

confidence: 95%

“…Basic studies on the tribological properties of SAMs have been also performed using organosulfur on Au [12][13][14][15] for a number of reasons. One reason is that there are many kinds of organosulfur compounds which can easily form SAMs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Nakano

Miyake

2013

Tribology Online

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The tribological properties of self-assembled monolayers (SAMs) on Au were investigated with a focus on the effects of the structure and end groups of the molecules upon the frictional properties of the modified surfaces of the SAMs. Three kinds of organothiols were used: HS-(CH 2 ) 11 -(O-CH 2 -CH 2 ) 3 -OCH 3 : EG3OMe, CH 2 -(CH 2 ) 15 -SH: HDT, and OH-(CH 2 ) 16 -SH: HDTOH. The SAM surfaces were characterized by contact angle measurements of pure water, X-ray photoelectron spectroscopy, and infrared reflection absorption spectroscopy. The frictional properties were examined using a pin-on-plate tribometer. The friction coefficients of the SAM surfaces were similar to the bare Au surface in the high normal load region. In the low normal load region, HDT SAMs exhibited lower friction coefficients than HDTOH SAMs. The end groups affected the friction coefficients for the same chain structures. The friction coefficients of the EG3OMe SAMs were lower than those of HDT SAMs. The HDT SAMs were thought to have well-organized structures. On the other hand, the EG3OMe SAMs probably had more flexible structures than the HDT SAMs because of their ethylene glycol chains, indicating that the chain structures as well as the end groups affected the friction coefficients of the SAMs.

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Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials

et al. 2006

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We report on the self-healing behavior of a polyelectrolyte-based aqueous lubricant additive, poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG), during aqueous lubrication of an oxide-based tribosystem. Combined pin-on-disk tribometry and fluorescence microscopy experiments have shown that stable lubricating performance was enabled by means of rapid healing of the worn tribopair surface by polymers dissolved in the adjoining bulk lubricant. This rapid 'self-healing' of PLL-g-PEG is attributed to electrostatic interactions between the polycationic poly(L-lysine) (PLL) backbone of the polymer and negatively charged oxide surface. In contrast, a similar healing effect was not readily achievable in the case of methoxy-poly(ethylene glycol)-trimethylsilylether (Sil-PEG), a lubricant additive that is covalently bonded to the surface prior to tribological stress.

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Alkyl Chain Length Effect on Tribological Behavior of Alkanethiol Self-Assembled Monolayers on Au

Cited by 26 publications

References 1 publication

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials

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