Mass flux through asymmetric nanopores: Microscopic versus hydrodynamic motion

被引：14

作者：

Chinappi, Mauro ^{[1
]}

Melchionna, Simone ^{[2
]}

Casiola, Carlo Massimo ^{[1
]}

Succi, Sauro ^{[3
]}

机构：

[1] Univ Roma La Sapienza, Dept Mech & Aeronaut, I-00184 Rome, Italy

[2] Univ Roma La Sapienza, Dept Phys, INFM SOFT, I-00185 Rome, Italy

[3] CNR, Ist Applicaz Calcolo, I-00161 Rome, Italy

来源：

JOURNAL OF CHEMICAL PHYSICS | 2008年 / 129卷 / 12期

关键词：

D O I：

10.1063/1.2987408

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crossover from hydrodynamic to microscopic motion in nanoscopic channels with broken spatial symmetry is investigated by means of many-body molecular dynamics simulations at various pore diameters. It is found that both hydrodynamic and microscopic regimes favor motion along the convergent over the divergent directions, although with a different scaling of the mass flow with the pore diameter. In either cases, departure from linear response and the ensuing detection of spatial asymmetry seems to respond more to the intensity of the external drive than to the granularity of the flowing system. Our simulations suggest that this property lies at the heart of microscopic ratchet motion and its capability of echoing the symmetry-breaking detection realized by macroscopic fluids at nonzero Reynolds numbers. (C) 2008 American Institute of Physics.

引用

页数：7

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