Prediction of elastic-contact friction of transition metals under light loads based on their electron work functions

Li, Yanping; Li, D Y

doi:10.1088/0022-3727/40/19/030

Cited by 11 publications

(3 citation statements)

References 51 publications

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“…Thus, EWF is a fundamental property that could be used to predict and evaluate the mechanical behavior of metals. Previous studies [7][8][9][10][11][12][13][14] have demonstrated that mechanical properties of metals can be correlated to their electron work functions. For instance, Young's moduli, yield strength, and hardness of pure metals have a six-power relationship with their EWFs.…”

mentioning

confidence: 99%

Dependence of the mechanical behavior of alloys on their electron work function—An alternative parameter for materials design

Lu¹,

Hua²,

Li³

2013

Applied Physics Letters

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Mechanical and thermal behaviors of nitrogen-doped Zr-Cu-Al-Ag-Ta--An alternative class of thin film metallic glass Appl.In this article, we demonstrate that the electron work function (EWF) as an intrinsic parameter can provide information or clues in a simple or straightforward way for material design, modification, and development. A higher work function of a material represents a more stable electronic state, which consequently generates a higher resistance to any attempt of changing the electronic state and other corresponding states, e.g., changes in structure or microstructure caused by mechanical and electrochemical actions. Using Cu-Ni alloy as an example, we demonstrate the correlation between the EWF and Young's modulus of the material as well as its hardness. The properties of a material can be modified using elements with appropriate work functions. This is also applicable for tailoring inter-phase boundaries or interfaces. V C 2013 AIP Publishing LLC.

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mentioning

confidence: 99%

Dependence of the mechanical behavior of alloys on their electron work function—An alternative parameter for materials design

Lu¹,

Hua²,

Li³

2013

Applied Physics Letters

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“…-(i) the thickness [48] and orientation [49] of grafted molecules at the macro- [50] and nanoscale [51]: That means that the CPD continuously increases with the packing density of SAM [52] ; -(ii) the grafting success [53]: the larger the CPD difference vs. the reference bias (CPD Si = 0 V), the stronger the molecules adhere onto the silicon substrate; -(iii) the surface reactivity for a given surface [44]: the more negative of the CPD measurement the higher the surface reactivity, according to the reactivity of the reference. In our case, any positive rise of the CPD may be connected to a decrease of the surface reactivity vs. the bare silicon one [45]; -(iv) many other tribological properties as friction level or wear precursors detection in the sub-surfaces as reported by several authors [54,55], thus: Figure 4 compares the CPD of the three printed nanopatterned SAM samples with respect to the bare silicon one taken as the reference with 0 V bias:…”

Section: Kelvin Probe Analysismentioning

confidence: 52%

Thermal-Controlled Frictional Behaviour of Nanopatterned Self-assembled Monolayers as Triboactive Surfaces

et al. 2020

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Friction is an important limitation of energy efficiency performances of MEMS/NEMS but is, in the same time, a great opportunity for harvesting energy by designing optimized Tribo-Electric Nano-Generators (TENG). Thus, frictional behaviour can be accurately controlled in real-time by using thermally sensitive periodic patterned self-assembled monolayers of n-octadecyltrichlorosilane (OTS) grafted on MEMS surfaces. Nanopatterns are currently used in order to limit the wear rate without modifying the frictional behaviour. In this work, patterns have been created by micro-contact printing (µCP) using a polydimethylsiloxane (PDMS) stamp displaying a trapezoidal profile. Hence pattern periodicity can be continuously changed-and then optimized from discontinuous to pseudo-continuous-by applying a controlled normal load on the soft PDMS stamp. A multiscale tribological study has been carried out on these nano-patterns by using both single-asperity and multi-asperity nanotribometers. Lateral Force Microscopy (LFM) provides the individual frictional behaviour of each pattern's component whereas the multiasperity nanotribometer rather gives the emerging frictional behaviour induced by the patterning according to temperature. As a macroscopic crucial parameter while designing TENG's devices, this macroscopic behavior has to be carefully optimized for each practical applications at the molecular scale. Thus, whereas the microscale frictional behaviour can be precisely optimized by the pattern's periodicity, the macroscopic one can be accurately controlled with values of friction coefficient ranging from 0.12 to 0.04 by varying the contact temperature. In addition, any inertial effects observed in the thermal-controlled frictional behavior of nano-patterns can be drastically reduced using infra-red emission as thermal source.

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“…2 There is also evidence linking the work function of a metal surface to its friction coefficient. [3][4][5] Quasicrystals are metallic alloys having aperiodic atomic order. 6,7 Most quasicrystals exhibit forbidden rotational symmetries.…”

mentioning

confidence: 99%

Work function of a quasicrystal surface: Icosahedral Al–Pd–Mn

Ünal¹,

Sato²,

McCarty³

et al. 2009

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The work function of a surface is one of its most basic and influential features. It has long been recognized that work function controls thermionic and field emission. The work function of a solid surface affects charge transfer to or from an adsorbate. It influences the electron tunneling probability between surfaces. It plays a role in quantization of electron states parallel to the surface in metal-supported metallic nanoislands. There is also evidence linking the work function of a metal surface to its friction coefficient.

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Prediction of elastic-contact friction of transition metals under light loads based on their electron work functions

Cited by 11 publications

References 51 publications

Dependence of the mechanical behavior of alloys on their electron work function—An alternative parameter for materials design

Dependence of the mechanical behavior of alloys on their electron work function—An alternative parameter for materials design

Thermal-Controlled Frictional Behaviour of Nanopatterned Self-assembled Monolayers as Triboactive Surfaces

Work function of a quasicrystal surface: Icosahedral Al–Pd–Mn

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