Device and method for preparing two-dimensional nanosheet material through cooperation of ball milling and cavitation

Abstract

The invention discloses a device and method for preparing a two-dimensional nanosheet material through cooperation of ball milling and cavitation. An output shaft of a motor is coaxially and fixedly connected with the center of a rotating disc, a spiral container is arranged on the front face of the rotating disc, the upper end of the spiral container is connected with an upper feeding and discharging head, and the lower end of the spiral container is connected with a lower feeding and discharging head; an upper magnetic force generator is arranged at the upper end of the upper feeding and discharging head, a lower magnetic force generator is arranged at the lower end of the lower feeding and discharging head, and the upper magnetic force generator and the lower magnetic force generator are the same in structure and each composed of a first connecting plate, a connecting rod, a second connecting plate, electromagnets, bridge type switches and a power source, wherein the multiple electromagnets are fixedly embedded inside the lower end of the second connecting plate, each electromagnet is wound with a coil, and all the coils are connected with the power supply through the bridge switches; a small-diameter section is arranged in the middle of the front surface of each coil of solenoid of the spiral container, and grinding balls can just pass through the small-diameter sections; and the two-dimensional nanosheet material is prepared by spontaneously generating cavitation through common ball milling, so that the efficiency and the preparation precision are effectively improved.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for preparing a two-dimensional nanosheet material. Background technique [0002] The basic units of nanomaterials can be divided into zero-dimensional, one-dimensional, and two-dimensional nanomaterials according to the spatial dimension. The characteristics are widely used in fields such as field effect transistors, optoelectronic devices, and thermoelectric devices. The controllability of its spin and valley degrees of freedom has attracted attention in the fields of spintronics and valleytronics, and is different from crystals of two-dimensional nanomaterials. The special properties of the structure will lead to the anisotropy of Raman spectrum, photoluminescence spectrum, second-order harmonic spectrum, light absorption spectrum, thermal conductivity, electrical conductivity, etc., in polarized optoelectronic devices, polarized thermoelectric devices, bionic ...

AI Technical Summary

Problems solved by technology

However, compared with graphene, the preparation methods of boron nitride nanosheets mainly adopt ball milling method and liquid phase exfoliation method. Although ball milling method and liquid phase exfoliation method can prepare high-quality two-dimensional nano boron nitride, due to the However, it cannot meet the needs of large-scale and efficient production of two-dimensional nano-boron nitride.

The ball milling method uses the impact of the falling grinding body (such as steel balls, pebbles, etc.) and the grinding effect of the grinding body and the inner wall of the ball milling tank to crush and mix the materials. , so that the material is continuously crushed by the grinding ball, but there are the following disadvantages: ① bulky and heavy; ② there is strong vibration and noise during operation, and a solid foundation is required; ③ low working efficiency and large energy consumption; ④ grinding The friction loss between the body and the body is very large, and it will contaminate the product

This method requires ball milling and ultrasonication to be carried out separately, and the equipment used is huge, inconvenient to use, and the efficiency and precision of preparation are not high enough

Images