Micro/atomic-scale vibration induced superlubricity

Shi, Shuai; Guo, Dan; Luo, Jianbin

doi:10.1007/s40544-020-0414-z

Cited by 18 publications

(17 citation statements)

References 35 publications

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“…Then efficient methods to control superlubricity by external vibration conditions have been developed [42]. The energy dissipation in the tapping mode seems to be deeply related to the vibration induced superlubricity due to the similar motion patterns [43].…”

Section: Introductionmentioning

confidence: 99%

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

2021

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Dynamic friction occurs not only between two contact objects sliding against each other, but also between two relative sliding surfaces several nanometres apart. Many emerging micro- and nano-mechanical systems that promise new applications in sensors or information technology may suffer or benefit from noncontact friction. Herein we demonstrate the distance-dependent friction energy dissipation between the tip and the heterogeneous polymers by the bimodal atomic force microscopy (AFM) method driving the second order flexural and the first order torsional vibration simultaneously. The pull-in problem caused by the attractive force is avoided, and the friction dissipation can be imaged near the surface. The friction dissipation coefficient concept is proposed and three different contact states are determined from phase and energy dissipation curves. Image contrast is enhanced in the intermediate setpoint region. The work offers an effective method for directly detecting the friction dissipation and high resolution images, which overcomes the disadvantages of existing methods such as contact mode AFM or other contact friction and wear measuring instruments.

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Section: Introductionmentioning

confidence: 99%

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

2021

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“…With the in-situ TEM nanofriction tests in high vacuum, the external environmental effects were eliminated, the tip was driven by a cantilever to slide with the surface of sp 2 nanocrystallited carbon films, which is similar with the AFM friction. In the atomic scale, the Prandtl-Tomlinson (P-T) model dominate the understanding of stick-slip [39][40][41]. In this research, a minimum force to the slider for the "pretensioning" of the spring between point mass and slider was also needed to overcome potential barriers, as the first friction force increasing stage in this manuscript.…”

Section: In-situ Tem Nanofriction Propertiesmentioning

confidence: 96%

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Fan

Huang

2022

Friction

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Carbon films with two different kinds of sp2 nanocrystallited structure were investigated to study the stick-slip friction with the in-situ and ex-situ tests. In-situ transmission electron microscope (TEM) observation and nanofriction tests revealed that the origins of stick and slip varied with shear stress and film deformation. At the stick stage, shear stress gradually increased with the contact strengthened until reached the shear strength to break the interfacial adhesion; at the slip stage, the shear stress decreased and accompanied with film deformation. During the sliding process, adhesive deformation resulted in the large stick-slip step while ploughing deformation led to a smoother step. Ex-situ nanofriction tests on a series of sp2 nanocrystallited carbon films with different irradiation energies showed the expected sliding behavior with the in-situ results. This study first clarified the mechanism of stick-slip friction with the in-situ TEM observation, which plays the important role for the micro and nano application of sp2 nanocrystallited carbon films.

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“…Previous experiments and simulations [12,22,27,28] have suggested that vibration-induced friction reduction is dependent on the magnitude of vibration amplitude. This is also consistent with the results shown in Fig.…”

Section: Friction Vs Actuation Amplitudementioning

confidence: 97%

“…Using atomic force microscopy (AFM), Socoliuc et al [12] showed that, by imposing an alternating current (AC) voltage between a conductive probe and an ionic crystal, friction could be substantially reduced owing to vibration caused by alternating electrostatic force. Similar friction modulation has also been achieved by directly vibrating the base of the AFM probe [20,21], or the sample using external transducers [22][23][24][25][26]. The effect of mechanical vibration on microscopic friction is commonly understood by the modified Prandtl-Tomlinson (P-T) model [27][28][29], where the mechanical vibration is considered as a perturbation to the interaction corrugation associated with sliding.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, although nanoscale friction reduction has been demonstrated experimentally, the vibration driving methods so far are not easily implementable for practical applications. For instance, the alternating electrostatic force relies on the complex electrostatic interaction between the AFM probe and the sample [12,14,20], which is closely related to the dielectric constant and surface potential of the sample, and geometries of the system [30]; while the other schemes require vibration of the whole contact interface using external actuators [20][21][22][23][24][25][26], which may introduce adverse impacts on functioning of the device. Therefore, it would be highly desirable if one can tune friction by vibrating the contact interface locally in a simple way.…”

Section: Introductionmentioning

confidence: 99%

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Vibration-induced nanoscale friction modulation on piezoelectric materials

Cao

2022

Friction

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Mechanical vibration, as an alternative of application of solid/liquid lubricants, has been an effective means to modulate friction at the macroscale. Recently, atomic force microscopy (AFM) experiments and model simulations also suggest a similar vibration-induced friction reduction effect for nanoscale contact interfaces, although an additional external vibration source is typically needed to excite the system. Here, by introducing a piezoelectric thin film along the contact interface, we demonstrate that friction measured by a conductive AFM probe can be significantly reduced (more than 70%) when an alternating current (AC) voltage is applied. Such real-time friction modulation is achieved owing to the localized nanoscale vibration originating from the intrinsic inverse piezoelectric effect, and is applicable for various material combinations. Assisted by analysis with the Prandtl—Tomlinson (P—T) friction model, our experimental results suggest that there exists an approximately linear correlation between the vibrational amplitude and the relative factor for perturbation of sliding energy corrugation. This work offers a viable strategy for realizing active friction modulation for small-scale interfaces without the need of additional vibration source or global excitation that may adversely impact device functionalities.

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Micro/atomic-scale vibration induced superlubricity

Cited by 18 publications

References 35 publications

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Vibration-induced nanoscale friction modulation on piezoelectric materials

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