Preparation Of Micro-nano Spherical Barium Titanate And Its Application In Medical Dry Film Diffusion Layer

In recent years,people pay more attention to their own health,so it is urgent to develop the dry chemical technology to effectively detect human health indicators.The dry diffusion layer needs a powder with high reflectivity,high whiteness,and uniform micro-size.In addition to dielectric and piezoelectric properties,BaTiO₃ has good biocompatibility,high whiteness,high reflectivity,etc.Therefore,according to the requirements of the dry diffusion layer,the preparation of spherical BaTiO₃ is one of the key technologies in the field of medical detection.Spherical BaTiO₃ with uniform particle size were prepared using batch precipitation method with BaCl₂,TiCl₄ and NaOH as the raw materials.The effects of reaction time,raw material concentration,and reaction temperature on the BaTiO₃ powders were investigated and the conditions were optimized.Through SEM statistical analysis,spherical BaTiO₃ powders can be obtained with the particle size range of 0.06⁰.6?m,uniform particle dispersion,and yield up to 99%.Further,the batch precipitation method has the advantages of short reaction period and no need of calcination.The formation mechanism of BaTiO₃ sphere was proposed according to the reaction crystallization process.On the basis of the batch precipitation method,the BaTiO₃ powders were carried out by microchannel continuous precipitation method.The process conditions of BaTiO₃ were investigated,and spherical BaTiO₃with particle size of 40²00 nm was obtained.Nanoparticles with the particle size of less than 40 nm can be prepared by controlling the reaction conditions,which provides a wider application field for the application of BaTiO₃ powder.The method improves the problems of complex operation and difficulty control of the process conditions of batch precipitation method.The barium titanate diffusion layer was prepared using BaTiO₃ as raw material.The preparation conditions were investigated and optimized.Compared with BaTiO₃,TiO₂ and BaSO₄,it was found that the reflectivity of the self-made BaTiO₃ diffusion layer reached 99.2%,which was better than that of commercially BaTiO₃,TiO₂ and BaSO₄.In addition,the size and distribution of the intergranular voids in the self-made BaTiO₃ diffusion layer are uniform,which was more conducive to the uniform diffusion and permeation of serum to react with substrate in the reagent layer.Moreover,the repeatability of chromogenic reaction is good.It shows that the self-made BaTiO₃ can be applied to the detection of medical dry chemical reagents,which opens up a new research direction for the application of BaTiO₃ particles.