The Investigantion Of Nanopump Driven By Non-Equilibrium Fluctuation

Since the1990s, the nanoscience and technology have made great progress. Today, many nano-devices with special functions have been produced by manipulating atoms and molecules. Nano pump is a kind of nano-devices device which can transport fluid in nano scale. Recently, many kinds of nano pump have been devised, which is driven by osmotic or hydrostatic pressure gradient, chemical or thermal gradient. Nano pumps have a wide range of applications, such as drug delivery, seawater desalination, molecular extraction, nano-propeller and nano-sensors. But a continued energy input is required to keep these nano pumps work, and it is hard to control the flux generated by them. In addition, it is still very difficult to generate a continuous flux. Non-equilibrium fluctuation exists in the thermodynamics environment universally. The nano pump can obtain energy from these non-equilibrium fluctuations to drive the molecules transport unidirectionally. But by far, the related research is still very limited in this filed.In this paper, using molecular dynamics method, we mainly designed a nano pump driven by non-equilibrium fluctuation. And the mechanism of transportation of glycerol unidirectionally across the Glycerol Channel driven by periodic external force was studied by the method of non-equilibrium fluctuation theory. The main contents of this paper are as follows:In Chapter I, the background knowledge of nanotechnology and the research status of the nano pump are introduced. And the main research method and contents of this paper are also introduced. In Chapter Ⅱ, the basic concept of Molecular Dynamics is introduced. This mainly contains the brief history of Molecular Dynamics, the basic principle of Molecular Dynamics, the force filed, the integral of kinetic equation, the initial conditions, the boundary conditions and the computing procedure of Molecular Dynamics.In Chapter Ⅲ, the background knowledge of non-equilibrium fluctuation theory and one dimension Brownian particle’s motion in periodicity potential are introduced.In Chapter Ⅳ, I designed a nano pump driven by non-equilibrium fluctuation through the method of Molecular Dynamics. The nano pump can convert the energy of the oscillating charge into the unidirectional transport of the water molecules. The maximal value of the water flux even exceeds the measured value for aquaporin-1(AQP-1). The direction and magnitude of the water flux can be controlled conveniently by the oscillation period of the charge, the distance of the charge from the SWNT and the symmetry property of the water-SWNT system.In Chapter Ⅴ, the mechanism of transportation of glycerol unidirectionally across the Glycerol Channel driven by periodic external force was studied by the method of non-equilibrium fluctuation theory.. Which part of the structure of Glycerol Channel plays the key role in unidirectional transport is studied by using Fokker-Planck equation.In Chapter Ⅵ, the summarization and prospect of this work are presented.