Direct fabrication of graphite-mica heterojunction and in situ control of their relative orientation

Liu, Bingtong; Wang, Jin; Xiao, Peng; Qu, Cangyu; Ma, Ming; Zheng, Quanshui

doi:10.1016/j.matdes.2018.09.032

Cited by 12 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This ultralow friction was attributed to the sustainable overall incommensurability due to the multi-asperity contact covered with randomly oriented graphene nanograins. Microscale superlubricity of heterojunctions between graphite and mica [41], graphite and hexagonal boron nitride [42] was also obtained based on the self-retraction behavior of graphite mesas.…”

Section: Superlubricity Of Two-dimensional (2d) Materialsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

View full text Add to dashboard Cite

The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

show abstract

Section: Superlubricity Of Two-dimensional (2d) Materialsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In general, the mesas showing self-retraction motion (termed SRM mesas), i.e., the upper part of the mesa could self-retract to its initial position after being sheared with a tungsten tip and then releasing the tip, are identified. Then, the upper part of the graphite mesa, i.e., graphite flake, is transferred onto a freshly cleaved millimeter-sized muscovite mica to form microscale graphite/mica heterojunctions by using the technique developed in a previous work (21). With this procedure, the interface of the microscale graphite/mica heterojunction is composed of single-crystal surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…The graphite/mica heterojunctions are fabricated by transferring the SRM graphite flake onto the millimeter-sized muscovite mica freshly air-cleaved under ambient conditions. By such a direct transfer method, a monocrystalline graphite/mica heterojunction can be fabricated, the interface of which has been confirmed to be flat and clean with the height fluctuations less than 1 nm (21). The process of the sample preparation is carried out under ambient conditions at a room temperature of 28°C and RH of 22%.…”

Section: Preparation Of Graphite/mica Heterojunctionmentioning

confidence: 99%

Negative friction coefficient in microscale graphite/mica layered heterojunctions

et al. 2020

Self Cite

View full text Add to dashboard Cite

The friction of a solid contact typically shows a positive dependence on normal load according to classic friction laws. A few exceptions were recently observed for nanoscale single-asperity contacts. Here, we report the experimental observation of negative friction coefficient in microscale monocrystalline heterojunctions at different temperatures. The results for the interface between graphite and muscovite mica heterojunction demonstrate a robust negative friction coefficient both in loading and unloading processes. Molecular dynamics simulations reveal that the underlying mechanism is a synergetic and nontrivial redistribution of water molecules at the interface, leading to larger density and more ordered structure of the confined subnanometer-thick water film. Our results are expected to be applicable to other hydrophilic van der Waals heterojunctions.

show abstract

“…Different transducer types are suitable for various ultrasonic guided wave applications. Excitation or reception components can be piezoelectric wafers [7,8], shear-horizontal transducers [9,10], polyvinylidene difluoride (PVDF) transducers [11], air-coupled transducers [12,13], pulsedlaser [14] and laser Doppler vibrometer (LDV) [15]. The patterns for transducer distribution vary from sparse array [16] to densely distributed arrays [17,18], and full-aperture array [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…With a resemblance to Gram-Schmidt orthonormalization, in CG, the updating direction p k is formed to ensure p k is conjugate to all the previous directions p i , i<k with respect to matrix H (H-orthogonal), i.e. The step length α k in equation(7)for model updating is calculated as Then the model residual for the (k+1)th iteration can be updated using equations(8) and(7)Instead of calculating all previous moving directions using e.g. (9) for each iteration, it is possible to use a step length β k to update the moving direction p k+1 , i.e.…”

mentioning

confidence: 99%

Least-squares reverse time migration (LSRTM) for damage imaging using Lamb waves

Rocha

Leser

et al. 2019

Smart Mater. Struct.

View full text Add to dashboard Cite

Large-area monitoring and accurate damage quantification are two primary goals of ultrasonic, guided wave-based structural health monitoring (SHM). Reverse-time migration (RTM) is an effective damage imaging technique for both metallic and composite plates. In geophysics, incorporating least-squares inversion into migration can generate images with higher resolution and suppressed artifacts in comparison with conventional RTM. Development of a least-squares reverse time migration (LSRTM) technique is promising for SHM since it could expand the imaging area for a given sensor array while maintaining a relatively high resolution. An LSRTM technique is introduced in this research for damage imaging in an isotropic plate using A 0 mode Lamb waves. A finite difference algorithm based on the Mindlin plate theory was used to simulate the flexural wave propagation. To form the theoretical foundations for guided wavebased LSRTM, a forward modeling operator and its adjoint are defined. The damage images from both numerical simulations and experiments show that LSRTM can enhance imaging resolution and reduce artifacts.

show abstract

Direct fabrication of graphite-mica heterojunction and in situ control of their relative orientation

Cited by 12 publications

References 31 publications

A review of recent advances in tribology

A review of recent advances in tribology

Negative friction coefficient in microscale graphite/mica layered heterojunctions

Least-squares reverse time migration (LSRTM) for damage imaging using Lamb waves

Contact Info

Product

Resources

About