With the miniaturization of flow devices, it becomes hard to pump fluid across nanoconfined geometries, where the large surface volume ratio presents a step dissipative barrier to fluid motion. Though progress in moving material inside the carbon naotubes has been made, it is difficult to develop a suitable nanoscale water pump device which can make a continuous unidirectional water flow on nanoscale.15,16 Conventionally, transporting water directionally through a nanochannel is driven by an osmotic or hydrostatic pressure gradient.17 Such a method would involve a large reservoir of solution on one side of the nanochannel to produce the pressure gradient. In additional, chemical and thermal gradients are also applied to drive fluid through nanochannels.18,19 Recently, different from the conversional methods, various novel blueprints for a nanopump have been proposed.20−22 In 1999, Kral et al. ́proposed a laser-driven pump for atomic transport through carbon nanotubes,20 while Insepov et al., using numerical simulations, showed that the gas inside the carbon nanotube can be driven by the Rayleigh surface wave.2 The experimentsthat followed have confirmed that nanoparticles inside the hollow core of multiwalled carbon nanotubes can be driven in the direction of the electron flow.22 Later, Duan et al. proposed
an energy pump for activating axial water molecules flow inside a carbon nanotube by setting up a small portion of the initially twisted wall of the carbon nanotube.