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Molecular dynamics simulation of ratchet motion in an asymmetric nanochannel (Articolo in rivista)
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- Label
- Molecular dynamics simulation of ratchet motion in an asymmetric nanochannel (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevLett.97.144509 (literal)
- Alternative label
Chinappi, M; De Angelis, E; Melchionna, S; Casciola, CM; Succi, S; Piva, R (2006)
Molecular dynamics simulation of ratchet motion in an asymmetric nanochannel
in Physical review letters (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Chinappi, M; De Angelis, E; Melchionna, S; Casciola, CM; Succi, S; Piva, R (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Univ Roma La Sapienza, Dept Mech & Aeronaut, I-00184 Rome, Italy; Univ Roma La Sapienza, Dept Phys, INFM, SOFT, I-00185 Rome, Italy; CNR, Ist Applicaz Calcolo, I-00161 Rome, Italy (literal)
- Titolo
- Molecular dynamics simulation of ratchet motion in an asymmetric nanochannel (literal)
- Abstract
- The persistence of ratchet effects, i.e., nonzero mass flux under a zero-mean time-dependent drive, when many-body interactions are present, is studied via molecular dynamics (MD) simulations of a simple liquid flowing in an asymmetric nanopore. The results show that (i) ratchet effects persist under many-body density correlations induced by the forcing; (ii) two distinct linear responses (flux proportional to the drive amplitude) appear under strong loads. One regime has the same conductivity of linear response theory up to a forcing of about 10 kT, while the second displays a smaller conductivity, the difference in responses is due to geometric effects alone. (iii) Langevin simulations based on a naive mapping of the many-body equilibrium bulk diffusivity, D, onto the damping rate, gamma are also found to yield two distinct linear responses. However, in both regimes, the flux is significantly smaller than the one of MD simulations. (literal)
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