Study On Dispersion Of Nanoparticle And Preparation Of Hollow Structural Nanomaterials

Dispersed technology of nanoparticle and preparation of hollow structural nanomaterials are the topic of nano-technology.The experiment study on the dispersion of nanoparticles and preparation of new nanomaterials.This paper studied on the single dispersion of TiO₂ and carbon black in the Perchloroethylene(PCE) respectively,selected surfactant active agent and NDZ-105 titanate as dispersing agent,TiO₂ and carbon black were able to stabilize in the PCE media respectively when the dispersant dosage is 0.667%.For the mixed dispersion of TiO₂ and carbon black,they were not able to stabilize in the PCE media by using the dispersing agent that the experiment had.Based on the above reason,The experiment using coating technology modified the carbon black and prepared the C-Al(OH)₃ core-shell composited nanoparticle made it had the similar chemical property with TiO₂ particle.This paper studied on the mixed dispersion of TiO₂ particle and modified carbon black,selected NDZ-105 titanate as dispersant,and when the amount of dispersant was 0.667 percent,TiO₂ and carbon black nanoparticles can stably dispersed in the PCE medium.In the above basis,Using Sol-Gel preparation of inorganic coating technology,this paper presents a novel technique to prepare Al₂O₃ hollow structural nanomaterial.It used C-Al(OH)₃ core-shell nanoparticle as intermediate phases,the Al₂O₃ hollow spheres were achieved by the calcination of the carbon cores and the dehydration of Al(OH)₃.The sample was characterized with TEM,XRD,TGA,FTIR and BET.The results show that the synthesized Al₂O₃ hollow sphere is amorphous,the average diameter of C-Al(OH)₃ core-shell nanoparticle is about 25nm,the thickness of the Al₂O₃ shell is about 5nm,the average pore diameter is 13.13nm,the total pore volume is 0.7063cm³/g and the surface area is 215.2 m²/g.Silica needle-shaped nano-hollow structure with a inside diameter about 20nm was prepared by a Sol-Gel approach using needle-shaped calcium carbonate(CaCO₃) nanoparticles as a novel template and sodium silicate as the silica source,followed by washing in acidic solution to remove the CaCO₃ sacrificial template.The synthesized silica nano-hollow tubualar material is regularly shaped and very uniform with a inside diameter about 20nm and a thickness of 10nm,a length from 200nm to 300nm.The synthesized silica nano-hollow tube is amorphous,It has typicalâ…£type of adsorption isotherm and H1 lagging loop.The specific surface area of the samples is up to 321.4m²/g, the average pore diameter is 63.83(?) and the total pore volume is 0.5128cm³/g.Experiment studied on the theory that SiO₂ film coated on the surface of needle-shaped CaCO₃,proposed the coating theory firstly,then explained the coating theory and didexperimental verification,eventually the coating theoretical process that SiO2 film coated on the surface of needle-shaped CaCO₃ was adsorption process-the Sol-heterogeneous nucleation-growth-Gel film.