Forming Mechanism Of Flexible Inorganic Nanofibers And Its Application In High Temperature Filtration

As an inorganic ceramic material,zirconium oxide has the characteristics of high temperature resistance,corrosion resistance,oxidation resistance,and low thermal conductivity.It has huge application potential in the fields of industry,medical treatment,aerospace,etc.,and its research as a ceramic fiber in the textile field has also had certain Progress,electrospun inorganic fiber has become the most commonly used preparation technology,but the current research work has some shortcomings such as high brittleness,low yield,weak practicability,etc.,so that the practical application of zirconia fiber is greatly limited.For the above problems,this article Make the following research work:(1)Using methanol as a solvent,acetic acid and basic zirconium carbonate as raw materials,and yttrium nitrate hexahydrate as a phase stabilizer,a precursor solution is prepared according to a certain molar ratio,and the precursor solution is controlled to a certain viscosity by a sol-gel method to obtain a spinning solution.Silk liquid,ie 400-1000 MPa?s,at room temperature 25°C,40% air humidity,the doping amount of phase stabilizer yttrium oxide is 6%,under the parameters of voltage 25 Kv and injection distance 20 cm Electrostatic spinning is used to prepare precursor gel fibers.After heat treatment at 1000?,continuous nano-scale zirconia fibers are finally obtained.The average diameter of the fibers is 350 nm.The surface is smooth and the continuity is good.The stiffness is up to 32.7 m N,the grain size of zirconia after calcination is 20-30 nm,it is stable cubic phase structure by diffraction analysis,and the spinnability is verified by infrared and nuclear magnetic test analysis The molecular structure of the polyzirconium acetate solution system exists in the form of long chains.This structure enables zirconia to maintain a continuous morphology when it is prepared into fibers,which is also the theoretical basis for the flexibility of the fiber membrane.(2)On the basis of the above experiments,the spinning technology was improved,the airflow assisted electrospinning technology was used to prepare zirconia nanofibers,the nozzle was added on the basis of the electrospinning technology,and the airflow assisted spinning was used liquid.The zirconia nanofibers have good high temperature resistance and corrosion resistance.The thermal conductivity of the fiber membrane is 0.022 W/(m?K)at 1000?.The fiber membrane is in 1mol/L sodium hydroxide solution and 1mol/L sulfuric acid After immersed in the solution for 24 hours,the fiber can be kept continuous and intact,and the fiber surface is smooth,showing good resistance to acid and alkali corrosion.The zirconia nanofiber membrane with a diameter of 300 nm has a filtration efficiency of 98.65% and a quality factor of 0.055 at 700°C for Na Cl aerosol particles with a diameter of 400 nm,showing excellent high-temperature filtration performance.Under the conditions of room temperature 25°C and 40% air humidity,the larger the voltage,the smaller the fiber diameter.At a voltage of 26 Kv,a precursor fiber with a diameter of 250 nm can be prepared.The fiber preparation efficiency can be adjusted by adjusting the airflow speed.The larger the output of the large fiber,the better the fiber continuity and the uniform diameter when the air flow rate is 25 slpm.The fiber output is 20g/h,which is 10 times more efficient than ordinary electrospinning.It is an industrial preparation of flexible zirconia nanofibers Provided data support.