Nano-tribology and Materials in MEMS

Sinha, Sujeet K.; Satyanarayana, N.; Lim, S.C.

doi:10.1007/978-3-642-36935-3

Cited by 15 publications

(1 citation statement)

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“…the displacements shown are normal to the plane of the girdle band. The vibration mode shapes for the centric diatom valve are similar to those of a circular plate [28,29], whilst for the pennate diatom Synedra acus. they are similar to that of an extended rod.…”

Section: Modal Shapesmentioning

confidence: 73%

FEM exploration of the potential of silica diatom frustules for vibrational MEMS applications

Abdusatorov

Salimon

Bedoshvili

et al. 2020

Sensors and Actuators A: Physical

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Numerical simulations were carried out using the Finite Element Method (FEM) to determine the frequency characteristics of mechanical vibration of diatom silica frustules under the conditions and at frequencies that are not readily accessible to experimental measurement. The results revealed the influence of the frustule morphology on the natural frequency spectra. The effect of frustule density, stiffness, dimensions, pore size, and wall thickness on the eigenfrequencies and the corresponding modal shapes were studied in detail. Diatom frustules have natural frequencies in the range between several MHz and tens of MHz that make them a promising candidate for future MEMS applications. Eigenfrequencies depend linearly on the speed of sound in the frustule wall and decrease parabolically with the diameter and the pore size to diameter ratio. Dimensional analysis allowed obtaining functional correlations that encapsulate the various dependencies in compact analytical form. The satisfactory nature of our calculations and correlations derived from them is confirmed through an agreement with the analytical solutions from the literature.

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Section: Modal Shapesmentioning

confidence: 73%

FEM exploration of the potential of silica diatom frustules for vibrational MEMS applications

Abdusatorov

Salimon

Bedoshvili

et al. 2020

Sensors and Actuators A: Physical

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Friction Reduction Effect Caused by Microcontact and Load Dispersion on the Moth‐Eye Structure

Tsujioka,

Koda,

Hirai

et al. 2024

Adv Eng Mater

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Friction reduction is important from the viewpoint of energy problems and other issues. Frictional forces are known to vary depending on the material property, surface texture, and measurement scale. However, the effect of submicron‐sized moth‐eye structures prepared of robust plastic deformation materials on dry friction under high‐load conditions has not been investigated in detail. To investigate this, a copper moth‐eye structure is fabricated via electroforming for experimental measurements. Results from the friction tests reveal that real contact area increase is suppressed, as the friction coefficient of the moth‐eye structure decreases exponentially with increasing load. Further friction simulation demonstrates nanoscale contact between the structure's tip and indenter, indicating that the real contact area increase requires deformation of the moth‐eye structure itself (microcontact). However, the contact pressure on the surface is reduced by dispersing the load to the sides and bottom of the moth‐eye structure. Therefore, the suppression of real contact area increase can be attributed to the deformation suppression facilitated by load dispersion. These findings expand the possibilities for friction design with surface textures because they reveal the role of robustness due to submicron‐scale surface microstructure in reducing friction between plastic deformation materials.

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