Relationships of Friction, Pull-off Forces and Nanometer-scale Surface Geometry.

Ando, Yasuhisa; Tanaka, Toshiyuki; Ino, Jiro; Kakuta, Kazuo

doi:10.1299/jsmec.44.453

Cited by 10 publications

(10 citation statements)

References 10 publications

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“…These hydroxyl groups partake in hydrogen bonding with the hydroxyl groups on the SiO 2 microsphere, leading to high adhesion [27,40,41,63]. Adhesion plays an important role in nanoscale friction, with friction generally increasing with adhesion forces [64,65]. Nanoscale friction is linearly correlated with load for weak adhesion between two surfaces [66,67].…”

Section: Resultsmentioning

confidence: 99%

Quantification/mechanism of interfacial interaction modulated by electric potential in aqueous salt solution

Bai

et al. 2020

Friction

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With the development of surface and interface science and technology, methods for the online modulation of interfacial performance by external stimuli are in high demand. Switching between ultra-low and high friction states is a particular goal owing to its applicability to the development of precision machines and nano/micro-electromechanical systems. In this study, reversible switching between superlubricity and high friction is realized by controlling the electric potential of a gold surface in aqueous salt solution sliding against a SiO 2 microsphere. Applying positive potential results creates an ice-like water layer with high hydrogen bonding and adhesion at the interface, leading to nonlinear high friction. However, applying negative potential results in free water on the gold surface and negligible adhesion at the interface, causing linear ultra-low friction (friction coefficient of about 0.004, superlubricity state). A quantitative description of how the external load and interfacial adhesion affected friction force was developed, which agrees well with the experimental results. Thus, this work quantitatively reveals the mechanism of potential-controlled switching between superlubricity and high-friction states. Controlling the interfacial behavior via the electric potential could inspire novel design strategies for nano/micro-electromechanical and nano/micro-fluidic systems.

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Section: Resultsmentioning

confidence: 99%

Quantification/mechanism of interfacial interaction modulated by electric potential in aqueous salt solution

Bai

et al. 2020

Friction

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“…Moreover, if θ S on CFCH-LB film were lower than CH-LB film, size of the capillary would became large and thus F W on each asperity would not be affected by nano-scale roughness 12) and its fluctuation would be suppressed.…”

Section: Discussionmentioning

confidence: 99%

Tribological Properties of LB films Measured under Zero Applied Load

2007

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We examined the pull-off and friction forces between an atomic force microscope (AFM) probe and submicron-scale asperities covered with Langmuir Blodgett (LB) films. First, we used a focused ion beam to produce several kinds of asperity arrays on two silicon substrates. The average radius of curvature was 95 to 800 nm, depending on the asperity array. An LB film of stearic acid (C 17 H 35 COOH) or fluoro-carboxylic acid (C 6 F 13 C 11 H 22 COOH) was deposited on each substrate. The friction force was measured at each asperity array under a zero applied load. The pull-off force was measured at each asperity array and also at controlled relative humidities of 3 to 73%. The results showed that the pull-off and friction forces were almost proportional to the radius of the curvature of the asperity peak with both stearic acid and fluoro-carboxylic acid LB films. The gradient of the friction force against the pull-off force, which corresponded to the friction coefficient, was 0.021 and 0.14 for the stearic acid and fluoro-carboxylic acid respectively. The pull-off force increased with higher relative humidity on the fluoro-carboxylic acid. We concluded that differences in the pull-off and friction forces between the two kinds of LB films were mainly caused by differences in the stiffness of the LB film.

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“…It was found that graphene, molybdenum disulfide (MoS 2 ), niobium diselenide (NbSe 2 ), and hexagonal boron nitride (h-BN), increased monotonically as the thickness decreases. The puckering effect and evolution of interfacial contact quality between tip and sample were two major mechanisms contributing to the thickness-dependent friction. , Adhesion was also an important factor affecting the behavior of nanofriction, and its enhancement will cause an increase of friction. , Strong adhesion between interfaces may lead to some special frictional phenomena, such as friction hysteresis between loading and unloading process, and negative friction factor. , The adhesion enhancement phenomenon that the slide-off force was larger than the pull-off force was also observed on graphene, graphene oxide, and fluorinated graphene under atomic force microscope (AFM) measurements . Interfacial adhesion between the tip and the strongly hydrophilic surface is principally a combination of van der Waals and capillary forces.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Adhesion was also an important factor affecting the behavior of nanofriction, and its enhancement will cause an increase of friction. 14,15 Strong adhesion between interfaces may lead to some special frictional phenomena, such as friction hysteresis between loading and unloading process, and negative friction factor. 16,17 The adhesion enhancement phenomenon that the slide-off force was larger than the pull-off force was also observed on graphene, graphene oxide, and fluorinated graphene under atomic force microscope (AFM) measurements.…”

Section: Introductionmentioning

confidence: 99%

Hydrophilicity-Dependent Distinct Frictional Behaviors of Different Modified MXene Nanosheets

et al. 2020

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MXene nanosheets are promising to be ultrathin solid lubricant or interface solving the friction and wear problems of miniaturized equipment. Here, the frictional behaviors and adhesive properties of the Ti 3 C 2 , F-Ti 3 C 2 , and TMA-Ti 3 C 2 nanosheets were explored by atomic force microscope for the first time. The nanofrictional behavior of TMA-Ti 3 C 2 was significantly different from that of Ti 3 C 2 and F-Ti 3 C 2 . The friction of TMA-Ti 3 C 2 increased slightly and then decreased as the load decreased, leading to the appearance of a negative friction factor; the frictions of Ti 3 C 2 and F-Ti 3 C 2 decreased with decreasing load, resulting in positive friction factors. Meanwhile, because the surface of TMA-Ti 3 C 2 was more hydrophilic than that of Ti 3 C 2 and F-Ti 3 C 2 , the friction and adhesion of TMA-Ti 3 C 2 were greater than those of Ti 3 C 2 and F-Ti 3 C 2 . It indicated that the surface properties played an important role in the adhesion and friction. Hence, adjusting the surface properties of MXene nanosheets will provide a new direction for designing solid lubricants and nanointerfaces in micro-and nanoelectromechanical systems.

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Relationships of Friction, Pull-off Forces and Nanometer-scale Surface Geometry.

Cited by 10 publications

References 10 publications

Quantification/mechanism of interfacial interaction modulated by electric potential in aqueous salt solution

Quantification/mechanism of interfacial interaction modulated by electric potential in aqueous salt solution

Tribological Properties of LB films Measured under Zero Applied Load

Hydrophilicity-Dependent Distinct Frictional Behaviors of Different Modified MXene Nanosheets

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