Study On The Properties Of Multifunctional Electrospinning Inorganic/organic Nanofiber Composites

In recent years,electrospinning technique has been stimulated great attention in many research fields such as sewage treatment,tissue engineering scaffolds,stealth fabrics,self-cleaning surface design,etc,possessing has the characteristics of interdisciplinarity,the combination of scientific research and industrialization,dual use of military and civilian use,etc.However,with the gradual development of the research progress,electrospun nanofibers with a single function can no longer meet the increasing design requirements.Therefore,the design and development of multifunctional electrospun fibrous membranes has become the general trend of electrospinning research work.This work is dedicated to modification of functional inorganic nanoparticles onto or within polymer fibers through an electrospinning technique to achieve the integration of the multiple functions of inorganic particles with the high porosity,high specific surface area and light density of electrospun nanofibers to address the current technical problems in the field of sewage treatment and functional fabrics.This thesis is divided into four chapters,the specific content is as follows:(1)Chapter 1 is the introduction section,starting from three major aspects: the development status of electrospinning technology,the research progress in the field of sewage treatment,and the research progress in the field of functional fabrics,extensive and in-depth research and exploration of the subject background will be provided;(2)In Chapter 2,starting from the field of sewage treatment,this work combines the electrostatic spinning method and solvothermal method to design PAN@W₁₈₄₉ nanofibers with dual functions of adsorption and photocatalysis have been prepares through an electrostatic spinning method combined solvothermal method.In this chapter,we carried out a series of characterization and performance tests for PAN@W₁₈₄₉ nanofibers,adsorption and photocatalysis were also studied in depth,to verify its application prospects for degrading organic pollutants.The photocatalytic performance of the composite material was tested with visible light as the light source.The composite material can effectively degrade a series of pollutants such as rhodamine B,methylene blue,malachite green,methyl orange,and tetracycline within 2 hours.The Zeta potential test result of the composite nanofiber is that the surface of fiber is negatively charged,which can electrostatically adsorb cationic dyes.Using Rhodamine B as the substrate for testing,the adsorption capacity of the composite fiber is 67.2 mg/g,and this adsorption effect can play an effective auxiliary role in the photocatalytic degradation process;(3)In Chapter 3,multifunctional PAN@Ag-AZO nanofibers with infrared stealth,antibacterial and self-cleaning properties have been fabricated through an electrospinning integrated with solvothermal and chemical deposition method.The characterization and multi-dimensional functional testing of the composite fibers were carried out.And of the influence of the different morphologies produced under different solvothermal conditions on the multiple functions has been explored.The results show that for infrared stealth performance,the infrared emissivity of the composite material in the 8-14 ?m band is as low as 0.36.The composite material can reduce the surface temperature of the detection target by 9 oC,which can make the target blend into the environment well;in terms of antibacterial performance,it can achieve 100%bacteriostasis against Escherichia coli and completely eliminate the growth activity of Escherichia coli.In terms of self-cleaning performance,by testing the water contact angle,we found that the infiltration behavior of the composite fiber conforms to the Wenzel model,and the water contact angle reaches 131.5o,which can make the water droplets slide freely to achieve a self-cleaning effect;(4)Chapter 4 is the summary and prospect part of this paper.It gives a comprehensive and in-depth summary of the topics involved in this paper,and looks forward to the future of multifunctional electrospun fibrous membranes.