Triboelectrochemistry on a nanometre scale

Zhu, Yuejin; Kelsall, G. H.; Spikes, H. A.

doi:10.1007/bf00173134

Cited by 10 publications

(10 citation statements)

References 10 publications

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“…The effect of triboelectricity on macroscopic friction coefficients in metals was also demonstrated using films coated with self-assembled monolayers13, electrodes14 and bearing steel15. The effect of AC and DC fields on friction angle of steel on PZT (lead zirconium titanate) was also observed by Seto16 who found equal effects of positive and negative bias.…”

mentioning

confidence: 86%

Friction coefficient dependence on electrostatic tribocharging

Burgo

Silva

Balestrin

et al. 2013

Sci Rep

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Friction between dielectric surfaces produces patterns of fixed, stable electric charges that in turn contribute electrostatic components to surface interactions between the contacting solids. The literature presents a wealth of information on the electronic contributions to friction in metals and semiconductors but the effect of triboelectricity on friction coefficients of dielectrics is as yet poorly defined and understood. In this work, friction coefficients were measured on tribocharged polytetrafluoroethylene (PTFE), using three different techniques. As a result, friction coefficients at the macro- and nanoscales increase many-fold when PTFE surfaces are tribocharged, but this effect is eliminated by silanization of glass spheres rolling on PTFE. In conclusion, tribocharging may supersede all other contributions to macro- and nanoscale friction coefficients in PTFE and probably in other insulating polymers.

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mentioning

confidence: 86%

Friction coefficient dependence on electrostatic tribocharging

Burgo

Silva

Balestrin

et al. 2013

Sci Rep

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“…Positive and negative current densities correspond to oxidation and reduction reaction rates, respectively. Since it is a non-steady-state technique, cyclic voltammetry is not suited to explore the effect of electrode potential on friction and wear, but some studies have used it to determine the redox behaviour of lubricant additives [28][29][30][31][32][33][34][35]. Figure 5 compares cyclic voltammograms of the ester base oil, diethyl adipate, containing LiClO 4 (as supporting electrolyte) with and without 2 wt% dibenzyldisulphide (DBDS), an extreme pressure additive [33].…”

Section: Electrochemical Measurements: DC Electrode Potentialsmentioning

confidence: 99%

“…Zhu et al also studied the effect of applied potential on friction of a sodium octanoate solution, using IR spectroscopy to determine the nature of surface films formed on an iron electrode [64], and in 1996 combined an STM/AFM with a miniature electrochemical cell to map the formation of iron octanoate tribofilm in response to electrode potential at an iron flat/Si 3 N 4 AFM tip contact [29]. Lateral force microscopy was also employed in 1997 by Kautek et al to study a Si 3 N 4 tip rubbing against silver under potential control; friction increased sharply at positive potentials in KBR solution but no such effect was seen with KF(aq) [65].…”

Section: Research On Aqueous Systemsmentioning

confidence: 99%

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Spikes

2020

Tribol Lett

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Research on the effects of applied electrical potential on friction and wear, a topic sometimes termed “Triboelectrochemistry”, has been reviewed. Historically, most such research has focussed on aqueous lubricants, whose relatively high electrical conductivities enable use of three-electrode electrochemical kinetic techniques, in which the electrode potential at a single electrode | fluid interface is controlled relative to a suitable reference electrode. This has led to identification of several different mechanisms by which applied electrode potentials can influence friction and wear. Of these, the most practically important are: (i) promotion of adsorption/desorption of polar additives on tribological surfaces by controlling the latters’ surface charges; (ii) stimulation or suppression of redox reactions involving either oxygen or lubricant additives at tribological surfaces. In recent years, there has been growing interest in the effects of applied electrical potentials on rubbing contacts lubricated by non-aqueous lubricants, such as ester- and hydrocarbon-based oils. Two different approaches have been used to study this. In one, a DC potential difference in the mV to V range is applied directly across a thin film, lubricated contact to form a pair of electrode | fluid interfaces. This has been found to promote some additive reactions and to influence friction and wear. However, little systematic exploration has been reported of the underlying processes and generally the electrode potentials at the interfaces have not been well defined. The second approach is to increase the conductivity of non-aqueous lubricants by adding secondary electrolytes and/or using micro/nanoscale electrodes, to enable the use of three-electrode electrochemical methods at single metal | fluid interfaces, with reference and counter electrodes. A recent development has been the introduction of ionic liquids as both base fluids and lubricant additives. These have relatively high electrical conductivities, allowing control of applied electrode potentials of individual metal | fluid interfaces, again with reference and counter electrodes. The broadening use of “green”, aqueous-based lubricants also enlarges the possible future scope of applied electrode potentials in tribology. From research to date, there would appear to be considerable opportunities for using applied electrical potentials both to promote desirable and to supress unwanted lubricant interactions with rubbing surfaces, thereby improving the tribological performance of lubricated machine components. Graphical Abstract

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“…For aqueous media results on the macroscopic scale have already been published. 15,16 In this communication we show the first macroscopic attempt for non-aqueous media with an ultra-pure IL in frictional contact influenced by applying electric potentials.…”

mentioning

confidence: 94%

“…3b), there is also a need to consider electrokinetic repulsion of ions. 16,33,34 From the literature it is known that with increasing film thickness the orientational effect of the ions becomes less. 27 Hence, the most likely effects such as electrokinetic repulsion of ions takes place under these conditions.…”

mentioning

confidence: 99%

Influence of electric potentials on friction of sliding contacts lubricated by an ionic liquid

Dold

Amann

Kailer

2015

Phys. Chem. Chem. Phys.

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Tribological investigations on the macroscopic scale revealed that friction can be influenced in situ by applying electric potentials, if electrically conductive fluid such as an ionic liquid is used as a lubricant. Enrichment of charged ions at a steel interface occurs by applying electric surface potentials in a three-electrode setup. As a consequence, the lubrication conditions change. It is supposed that electrically influenced surface adsorption and electrokinetic effects are the main mechanisms by which friction is varied.

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Triboelectrochemistry on a nanometre scale

Cited by 10 publications

References 10 publications

Friction coefficient dependence on electrostatic tribocharging

Friction coefficient dependence on electrostatic tribocharging

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Influence of electric potentials on friction of sliding contacts lubricated by an ionic liquid

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