The fluid running in the subnanochannel with functional surface

We have researched the motion of gas in the subnanochannel with functional surface which wettability has a gradient for the fluid by using molecular dynamics simulation. The results show that the gas is driven to flow under a single heat source and without any other work or energy applied to the system. The driving source is owed to the potential gradient of the functional face which keeps the fluid running in the subnanochannel. The width of the channel and the pressure of the reservoir has a significant influence on the flow velocity, which, respectively, has an optimal value for the maximum velocity. The flow velocity grows with the increasing temperature.