Exploration And Application Of Pouring Of The Nanoparticles Into AAO Template

The surface of anodic alumina template?AAO?has a highly ordered pore structure and is a kind of porous nano-material,in which the pore diameter and pore depth can be effectively adjusted during the preparation of the template.AAO template has many advantages.For example,the preparation process of AAO template is simple,and its thermal stability and chemical stability are good.Therefore,it has a wide range of applications.Based on the AAO template,two research directions are proposed in this paper.First,based on the AAO template,gold nanorods which have five-dimensional storage performance are poured into the holes of the AAO template to prepare long-life and high-density optical storage media.Secondly,on the basis of AAO template,SiO₂nanoparticles with passive radiative cooling characteristics are poured into the holes of AAO template,and then a radiative cooler with good thermal stability was obtained to achieve passive radiative cooling in the whole day.Since the information revolution,the generation of a large amount of data has made the demand for longer life-span and larger storage density more and more intense.Therefore,based on gold nanorods and AAO template,long-life and high-density optical storage media was studied:Gold nanorods with good monodispersity and uniform particle size distribution were prepared by silver-assisted one-step seed growth method,and a layer of silica shell was coated on the surface of gold nanorods by one-step aqueous solution direct coating method to improve the thermal stability of gold nanorods.Optical information storage medium was prepared by impregnating silica coated gold nanorods into the holes of AAO template by dip-pulling method.The information storage medium has an extremely high service life at normal temperature.Cooling is essential to modern society,and the world consumes a great deal of resources every year for cooling.Therefore,the passive radiative cooling device,which does not require additional energy,can reduce its temperature below ambient air temperature,which has aroused great interest among scientists.Therefore,based on SiO₂ nanoparticles and AAO template,a passive radiative cooling device with good thermal stability has been developed in this paper:The silica nanoparticles with good monodispersity are prepared by the st?ber method,and the silica nanoparticles are poured into the AAO template by the dip-pulling method to prepare the radiation cooler.The prepared cooler achieves effectively cooling throughout the day,and its thermal stability is excellent.Even after heat treatment at 600 degrees Celsius for a period of time,the cooling performance of the cooler has not become worse.The cooler?5 cm in length,4 cm in width and 1 mm in thickness?maintains a temperature that on average is 4.7?below that of ambient air during daytime,and it maintains a temperature that on average is 5.3? below that of ambient air at night.