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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Shape optimization of a meniscus-adherent nanotip.

Shihao Tian1,2, Xudong Chen1,2, Quanzi Yuan1,2

  • 1State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.

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Researchers used molecular dynamics simulations to understand nanotip dissolution in liquids. They identified an optimized tip shape that minimizes curvature, crucial for nano-instrument manufacturing and shielding capillary effects.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Soluble tips dissolve and form curvature when immersed in liquids, a process used in manufacturing.
  • Nanoscale dissolution mechanisms and real-time observation of this process remain poorly understood.

Purpose of the Study:

  • To investigate the dissolution process of meniscus-adherent nanotips using molecular dynamics simulations.
  • To understand the nanoscale mechanisms governing tip dissolution and identify an optimized tip shape.

Main Methods:

  • Molecular dynamics simulations were employed to model the dissolution of nanotips.
  • Analysis of tip apex curvature evolution and shape fitting to a double-Boltzmann function.

Main Results:

  • The tip apex curvature radius reaches a minimum at an intermediate, optimized shape.
  • The optimized tip shape can be described by a double-Boltzmann function, influenced by chemical potential and intermolecular forces.
  • A shape factor (ξ) was proposed to quantify nanotip sharpness, with optimized tips showing enhanced capillary effect shielding.

Conclusions:

  • The study elucidates the dissolution process of meniscus-adherent nanotips at the nanoscale.
  • The optimized tip shape and its characteristics provide theoretical support for the manufacture of nano-instruments.
  • Findings highlight the potential of optimized tips for improved performance in applications requiring capillary effect shielding.