The Study Of Three Dimension Ordered Nano Self-assembly Materials And Properties Based On Ice Template Method

With the rapid development of nano-materials and nanotechnology,more and more high-performance multi-functional nanomaterials have been synthesized and applied in various fields.However,single structure nanomaterials cannot meet the actual demand due to their single function.In many cases,it needs to be assembled into multi-scale assembly materials to further promote its practical application in the industrial field.In this field,three dimensional assembly materials have demonstrated potential application value in many fields.At present,although the researchers at home and abroad in the construction of three dimensional assembly body materials and the application has made some significant progress,but for the assembly structure of accurate control,environmental protection,controlled and convenient aspect and so on,is still in the exploratory stage,there are still many technical problems to industrial applications and scientific problems.In order to solve this problem,it is urgent to develop a simple,efficient,fast,controllable and environmentally friendly three dimensional assembly method.In recent years,orientation freezing method has many advantages,such as simplicity,high efficiency,universality,environmental protection and wide adaptability.This topic intends to be on this basis,through the orientation,of freezing method construction into a new three dimensional assembly material of orderly structure,and adjust the freezing parameters and perfusion polymer elastomer,which results in better mechanical properties and electrical conductivity,to satisfy the demands of practical application in the field.Here are the main findings:(1)Through single orientation freezing method of the silver nano wires built into three dimension ordered structures of silver nanowires aerogel,by adjusting the content of silver wire and freezing temperature,the different pore size and conductivity of the aerogels assembly body material.By adjusting the freezing parameters,the microstructure of the aerogel assembly material can be controlled accurately.At the same time,the aerogel assembly material shows excellent conductivity.Based on this,we injected the temperature-sensitive polyn-isopropyl acrylamide hydrogel elastomer in the aerogel assembly material,and finally obtained the stretchable elastic conductor material.The elastic conductor material shows high and stable conductivity,with the resistance changing 210%under the strain 700%,and the resistance change is only 520%after the cyclic stretching of 500 cycles.In addition,the elastic conductor material also has temperature responsiveness.As temperature changes,the conductivity of the target material also changes significantly.The reason is that when the temperature rises,the elastic conductive material will shrink,electronic transmission distance is shorter on unit area,and conductivity will increase significantly,is expected to be applied in the sensor field.It is worth that the elastic conductor material in laser irradiation,because of the existence of the silver-sulfur bond,in one minute the self-healing,the healing efficiency reached 93%.At the same time,the elastic conductor materials after healing still have excellent mechanical properties and conductive properties,which provide potential application value for biomedical and engineering fields.(2)By single orientation freezing method,the chitosan and graphene built into the three dimensional ordered structure of chitosan-graphene aerogels,high-temperature sintering process,and then get a three dimensional ordered structures of carbon-graphene hyperelastic materials,further through the hydrothermal method in its surface vertical growth molybdenum disulfide,eventually get carbon-graphene-molybdenum disulfide hyperelastic material assembly.The results show that the carbon-graphene superelastic material is composed of brittle carbon,which shows that the assembly material has excellent resilience and compressibility.By compression performance test,the carbon-graphene-disulphide assembly material still has excellent resilience and compressibility.When used as the electrode material of sodium ion battery,the assembly material shows high reversible capacity,good multiplier performance and long cycle stability.After 200 cycles of the current density 100 mA/g,the reversible capacity is 467.3 mAh/g,it can maintain the initial reversible capacity of 56.1%.After 200 cycles of current density 1 A/g,the reversible capacity is 439 mAh/g.At the same time,in the multirate performance test,the super elastic assembly material shows excellent cycling stability.These excellent properties are attributed to the existence of a large number of active sites on the elastomer surface.The active material of molybdenum disulphide can slowly permeate into the electrolyte and reduce the diffusion distance of sodium ion.In addition,the chemical bonds formed by C-O-Mo can promote the electron transmission from carbon to molybdenum disulphide,thus improving the reversible capacity and cyclic stability of the assembly material.(3)By single orientation freezing method,the graphene and silver nanowires built into the three dimensional ordered structure graphene-silver nano wires aerogel,the aerogel assembly material shows excellent compression and conductivity.Based on this,we injected the temperature-sensitive polyn-isopropyl acrylamide hydrogel elastomer in the aerogel assembly material,and finally obtained the stretchable elastic conductor material.The elastic conductor material has a stable conductivity,and the resistance changes to 38.4? after the strain 1200%stretching 500 cycles.The resistance change is only 0.1? after 1000 bending cycles(1 mm).In addition,the elastic conductor material also has temperature responsiveness.As temperature changes,the conductivity of the target material also changes significantly.It is worth that the elastic conductor material in laser irradiation,because of the existence of the silver-sulfur bond,in one minute the self-healing,the healing efficiency reached 92.5%.At the same time,the elastic conductor materials after healing still have excellent mechanical properties and conductive properties,which provide potential application value for biomedical and engineering fields.