Nano watermill driven by the revolving charge

TL;DR

This paper introduces a nanoscale watermill driven by a revolving charge within a carbon nanotube, demonstrating resonance effects that optimize water transport and could inform nanoscale fluidic device design.

Contribution

It presents a novel nano watermill concept driven by a revolving charge, revealing resonance phenomena that enhance water flux in a carbon nanotube system.

Findings

Maximum water flux at 4 THz revolving frequency

Resonance-like behavior influences water transport efficiency

Hydrogen bonds decrease significantly at optimal frequency

Abstract

Using molecular dynamics simulations, we propose a novel nanoscale watermill for unidirectional transport of water molecules through a curved single-walled carbon nanotube (SWNT). In this nanoscale system, a revolving charge is introduced to drive water chain confined inside the SWNT, which is served as nano waterwheel and nano engine. A resonance-like phenomenon is found that the revolving frequency of the charge plays a key role in pumping water chain. The water flux across the SWNT increases with respect to the revolving frequency of the external charge and reaches the maximum when the frequency is 4 THz. Correspondingly, the number of the hydrogen bonds of water chain inside the SWNT decreases dramatically with the frequency ranging from 4 THz to 25 THz. The mechanism behind the resonant phenomenon has been investigated systematically. Our findings are helpful for designing nanoscale fluidic devices and energy converters.