Preparation Of Multi-functional Microspheres By Microfluidic Chips And The Research Of Their Performance

The porous material is a very important and dynamic part of the field of materials chemistry research,as the material basis of chemistry,biology,medicine,physics and other interdisciplinary,it is an important part of chemical material,it will also have a major impetus force to industrial production.In order to meet the requirements of development,nano mesoporous materials are used as the basic module in this paper to self-assemble to prepare multi-functional porous microsphere materials.The multifunctional integrated porous microsphere not only retains the special surface properties such as large specific surface area and uniform pore size of the mesoporous material,but also can exert the physical and chemical properties of the functional group.One of the main themes of the development of modern technology is integration and miniaturization.Microfluidic technology has emerged as the times require.Microfluidic technology can integrate different functional materials in a system to prepare new multifunctional composite materials,and give composite materials chemical,physical,magnetic properties and so on.It can give full play to the advantages of functional materials.In this dissertation,a series of studies have been carried out on the preparation,characterization and sensing,adsorption,and removal performance of multifunctional integreated porous microspheres.The main research results obtained are as follows:The microfluidic chip is used as an auxiliary tool to prepare multifunctional materials through a novel “module fashion” assembly method.Firstly,amino-and thiol-and mercury ion probes based mesoporous silica materials and triiron tetraoxide(Fe3O4)nanomaterials were synthesized and used as building blocks to make multifunctional microspheres.Changing the composition and content of building module assembly,the single-component and multi-component composite microspheres with a diameter of 90 μm and good monodispersity(CV=6.8%)were prepared.Assembly microspheres with different building blocks still have a specific surface area of more than 400 m2g-1 and exhibit excellent performance in adsorbing various contaminants in water such as heavy metal ions and organic dyes.The integrated fluorescent probe in the prepared three-component composite microsphere Fe3O4-RBH-SH-MS can detect low concentration(0.045 μM)of Hg2+.The microspheres containing Fe3O4 nanoparticles have a magnetic susceptibility of 6.01 emu g-1 and can be easily removed from the wastewater by an externally applied magnetic field.Due to the stability of the mesoporous building blocks,the functions of each module in the integrated microsphere can be expressed independently without being affected by other modules,which provides a convenient way for the preparation of other multifunctional materials in sensing,catalysis,optoelectronics and other fields.