Molecular Momentum Transport at Fluid-Solid Interfaces in MEMS/NEMS: A Review

Abstract

This review is focused on molecular momentum transport at fluid-solid interfaces mainly related to microfluidics and nanofluidics in micro-/nano-electro-mechanical systems (MEMS/NEMS). This broad subject covers molecular dynamics behaviors, boundary conditions, molecular momentum accommodations, theoretical and phenomenological models in terms of gas-solid and liquid-solid interfaces affected by various physical factors, such as fluid and solid species, surface roughness, surface patterns, wettability, temperature, pressure, fluid viscosity and polarity. This review offers an overview of the major achievements, including experiments, theories and molecular dynamics simulations, in the field with particular emphasis on the effects on microfluidics and nanofluidics in nanoscience and nanotechnology. In Section 1 we present a brief introduction on the backgrounds, history and concepts. Sections 2 and 3 are focused on molecular momentum transport at gas-solid and liquid-solid interfaces, respectively. Summary and conclusions are finally presented in Section 4.

Flows of Polymer Melts through Nanopores: Experiments and Modelling

“…As for the wall slip it is believed that the slip length vanishes for a completely wetting surface, but increases with the contact angle [33]. When the contact angle goes to 180°, the slip length diverges as [34,35] s L σ~(…”

Theory of rheology in confinement

“…Improved experimental precision on small scales [14][15][16][17] has boosted also the research of confined systems [18][19][20], which is important for e.g. microfluidic devices [21,22], MEMS [23,24] or blood flow in capillaries [25,26].…”

Superhydrophobicity of Self-Organized Surfaces of Polymer Nanowire Arrays Fabricated by a Nano-Injection Moulding Technique

“…The velocity slip of liquid flows at a solid surface has been measured experimentally and simulated by molecular dynamics simulations as reviewed in Ref. 10. Wettability of a surface is shown to be one of the dominant factors.…”

“…(8)(9)(10) Surface effects substantially dominate the fluid flow due to the high surface-to-volume ratio in such micro-and nanoscale devices. Recently quite a few literatures have been published to show that liquids flowing over a solid surface do slip and the no-slip boundary condition is merely an approximation at macroscopic scale.…”