Study On Optimization Of Preparation Of Graphene By Ultrasound

Since the graphene was successfully prepared,its excellent conductivity,thermal conductivity and other properties quickly attracted the attention of all countries in the world,becoming the focus of research in the field of materials and engineering.With the advance of graphene technology and application,how to produce high quality graphene easily,efficiently and in large scale has become the current research difficulty.At present,there are many methods for preparing graphene,and the liquid phase stripping method separates the graphene from the graphite surface by an ultrasonic method.The method has the advantages of simple operation,low preparation cost,no damage to the quantum structure of the graphene,The preparation method of graphene ultrasonic equipment,the ultrasonic vibration system,the reactor structure design,directly determines the sound field distribution of ultrasound,and then determine the graphene ultrasound stripping effect,so the graphene ultrasound preparation equipment optimization It has important practical significance.Based on the analysis of the principle of liquid phase separation and ultrasonic vibration,this paper has completed the optimization design of the ultrasonic vibration equipment and laid a good foundation for the subsequent industrial preparation of graphene.This article mainly studies the following aspects:(1)Experimental grade optimization of graphene was made through the analysis of influencing factors of graphene ultrasonic preparation,synthesis of solvent type,ultrasonic power,ultrasonic frequency and ultrasonic time.(2)Aiming at the sound intensity and uniformity of graphene ultrasonic equipment,the main research on the optimization design of ultrasonic tool head was carried out.The four-head whip-type and dumbbell-type ultrasonic tool heads are respectively subjected to three-dimensional modeling.ANSYS finite element simulation analysis is performed to optimize the diamond-shaped ultrasonic tool head design.Experiments show that diamond-shaped ultrasonic tool head strong and uniform amplitude.At last,the CAD structure diagram of diamond tool head in ultrasonic vibration system is given,and the dimension design and installation method of each part of vibrator are described in detail.(3)By analyzing the influence of the distribution of sound field inside the reactor onthe stripping effect of graphene,the basic contents of the optimal design of the reactor,including the selection of the reactor,the determination of the pipe diameter and the pipe length,the series connection and the single reactor Design and so on.Aiming at the problem that the morphology of graphene dispersion is disturbed due to temperature rise and the instability of ultrasonic vibrating equipment,a cooling water circulation temperature control system is designed.The influence of magnetic field on the movement of graphene was analyzed and studied.The combination of magnetic field and acoustic field was proposed and the magnetic reactor was designed.(4)In order to realize simple,efficient and large-scale production of graphene,an industrial graphene ultrasonic preparation program is proposed,which includes the complete process flow of the equipment and an automatic monitoring system,so as to realize the function of remotely monitoring the status of the equipment by unattended operation.The graphene prepared on the actual production line is also given SEM,TEM,AFM characterization analysis report,which provides theoretical guidance and experimental evidence for the production of large-scale graphene.