Molecular dynamics simulation of the meniscus formation between two surfaces

Chen, Yunfei; Weng, Jian-Gang; Lukes, Jennifer R.; Majumdar, Arunava; Tien, C. L.

doi:10.1063/1.1394957

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…Additionally, molecular dynamics method, which is widely applied in many fields recently, has been tried and simulation of liquid bridge formation between a smooth surface and a molecularly rough surface represented by a one-dimensional sinusoidal wave was reported (Chen et al 2001). However, the validity of the simulation was not confirmed in the report.…”

Section: Introductionmentioning

confidence: 52%

Molecular dynamics simulation of ultra-thin liquid bridging between surfaces having two-dimensional roughness

et al. 2005

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By using the molecular dynamics, formation of molecularly thin liquid bridge between solid surfaces having molecular-scale roughness was simulated. Upon comparing the projected profiles of liquid bridges between solid surfaces with different roughness, it was found that the layered molecular arrangement inside the liquid bridge was disturbed by the molecular-scale roughness on the surfaces and the projected profiles were able to be approximated by arcs.

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Section: Introductionmentioning

confidence: 52%

Molecular dynamics simulation of ultra-thin liquid bridging between surfaces having two-dimensional roughness

et al. 2005

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“…Therefore, the tip surface is hydrohpilic and a meniscus on the tip apex generates an attractive force between the tip and the CNTs. [26][27][28] This force, however, is not generated in water. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Mechanical Properties of Suspended Carbon Nanotubes in Liquid

Ono¹,

Oya²,

Ogino³

2008

jjap

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In this paper, we describe the mechanical interaction between the vibrating tip of an atomic force microscope (AFM) and carbon nanotubes (CNTs) suspended over a trench on a Si wafer. The interaction was detected by recording the oscillation amplitudes of the cantilever tip above the suspended CNTs during both tip-down and tip-up processes. We refer to the oscillation amplitude versus tip vertical position as a force curve. In the force curve obtained in air, the mechanical response of a CNT bundle under a periodic external force applied by the tip is interpreted as a simple model that includes the attachment/ detachment of the CNTs onto the tip surface and the oscillation of the CNTs fixed to the tip. The curve obtained in water has features similar to that obtained in air. The difference between the force curves obtained in air and in water suggests that the adhesion force between the AFM tip and CNTs is weaked in water than in air.

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“…Chilamakuri and Bhushan [4] introduced a kinetic meniscus model to predict timedependent stiction force due to the capillary pressure of the meniscus at the HDI. However, when the lubricant film is molecularly thin and the flying height decreases to about 1 nm or less, this nonlinear continuum model may no longer be valid [5]. Furthermore, recent numerical research works [6][7][8][9][10][11][12] have found that, apart from the meniscus force, the van der Waals force also plays an important role at the HDI with super-low surface roughness.…”

Section: Introductionmentioning

confidence: 96%

Molecular Dynamics Simulation of Lubricant Redistribution and Transfer at Near-Contact Head-Disk Interface

Wong

et al. 2011

Tribol Lett

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When the spacing between the slider and lubricant in a hard disk drive decreases to less than 5 nm, the effect of the intermolecular force between these two surfaces can no longer be ignored. This effect on the lubricant distribution at the near-contact head disk interface is investigated via molecular dynamics method. In this study, the lubricant is confined between a smooth disk surface and a rough slider surface represented as a partially cosinusoidal wave. The simulation results reveal that the intermolecular force-induced meniscus formation at the near-contact head disk interface is strongly sensitive to the slider-to-disk separation, lubricant film thickness and the asperity shape (or roughness) of the slider. The attractive van der Waals forces between the slider and lubricant become weaker with increasing slider-to-disk separation and asperity mid-height, but decreasing lubricant film thickness and asperity mid-width. The Hamaker theory application to van der Waals interactions is also introduced to verify the molecular dynamics simulation. It is found that the critical separation, below which the lubricant will lose its stability to form a meniscus, increases approximately linearly with the lubricant film thickness, for slider surfaces with or without roughness both in the molecular dynamics simulation and Hamaker theory application to van der Waals interactions. Moreover, it is observed that the critical separation between a smooth disk and rough slider surface will slightly decrease when the asperity mid-height increases. The same phenomenon is observed when the asperity mid-width reduces.

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Molecular dynamics simulation of the meniscus formation between two surfaces

Cited by 11 publications

References 9 publications

Molecular dynamics simulation of ultra-thin liquid bridging between surfaces having two-dimensional roughness

Molecular dynamics simulation of ultra-thin liquid bridging between surfaces having two-dimensional roughness

Characterization of Mechanical Properties of Suspended Carbon Nanotubes in Liquid

Molecular Dynamics Simulation of Lubricant Redistribution and Transfer at Near-Contact Head-Disk Interface

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