| It is an eternal theme to learn from the mother nature for the survival and development of human society.After the evolution of hundreds of million years,life entities in nature have their own perfect structures and functions.The ion channels and ion pumps composed of protein on the cell membranes play an important role in life activities such as realizing signal transfer,energy conversion,mass transport between the cells and the external environment.With the rapid development of nano-biotechnology,materials science,etc,the bionic smart nano ion-channels are widely studied,which inspired by the structures and functions of the cell membranes.Several decades before,people have already started to research the regulations of different functions by the physical and chemical stimulation of light,pH,temperature and so on.In this thesis,we research the property in ion transport and energy conversion of two-dimensional nanofluidic system having photo responsive property,which based on two-dimensional layered graphene oxide nanofluidic system and introduced the responsive molecules at the same time.The research work of this paper are as follows:1.The graphene oxide multilayer membranes demonstrated with regular interlayer structure and stable existing in aqueous solution was prepared by vacuum suction filter of graphene oxide dispersion and then mild heat treatment.The preparation process of self-stacked construction of two-dimensional nanofluid is simple,fast,easy and effective and it also can be applied in a variety of materials.In addition,this preparation method endows two-dimensional nanofluid system's ability to adapt to different environment and ion transport characteristics,and paves a straightforward way towards the real-world applications of the novel transport phenomena on a nano-or sub-nanoscale.2.We demonstrated the two-dimensional layered graphene oxide nanofluidic device with photo-switchable ionic asymmetric transport properties based on the chemical modification of graphene oxide by drop castted of the ethanol solution of spiropyrane onto the graphene oxide multilayer membranes(GOM).In this process,the spiropyrane molecules penetrated into the GOM layers,and combined with GOM through the ?-? molecular interaction force and the electrostatic force.The modified GOM have good stability and photo-switchable ionic current rectification(ICR)obtained from this method.The degree of ICR can be prominently enhanced upon UV irradiation and it can be perfectly retrieved under irradiation with visible light.A maximum ICR ratio of about 48 was achieved.The smart and functional nanoflidic devices have applications in energy conversion,chemical sensing,water treatment,etc.3.Two-dimensional layered graphene oxide nanofluidic generators with a light-responsive property was demonstrated.Firstly,chemical modified the graphene oxide in the bulk solution made the light acid molecules or the light alkali molecules attached onto the nanosheet by the ?-? molecular interaction force and the electrostatic force.Then the two-dimensional layered graphene oxide nanofluidic device was obtained by vacuum filtration in sequence.This modification for GO in the bulk solution is high-efficiency,facile,and completely.The two-dimensional nanofluidic devices obtained by this way still has a regular interlayer structure and well stability in the aqueous solution,and can be applied to a variety of practical application.Finally,through the illumination added to the acid and alkali molecules,the local concentration of electrolyte changed and the proton asymmetry happened,which made it true that the two-dimensional nanofluidic devices can convert light energy into concentration gradient and further convert to ionic current based on the energy conversion mechanism of concentration gradient-electric energy.Meanwhile,we found that this process could cycle for many times with the opening and closing of light.This research results also can be applied to other 2D nanofluidic generators. |
PDF Full Text Request