Magnetically responsive two-dimensional material airgel microspheres and preparation method thereof

Abstract

The invention provides magnetically responsive two-dimensional material airgel microspheres and a preparation method thereof. Deionized water, two-dimensional materials, and polymer additives are prepared into an aqueous phase; salts of magnetic elements are dissolved into a salt solution; an organic solvent and a salt Mix the solutions to obtain a two-phase receiving bath; load the syringe containing the aqueous phase dispersion on the electrostatic spray device, and install a back-type needle; place the step two-phase receiving bath directly under the needle, and add a stirrer for stirring; Filtrating and washing the obtained mixture to obtain two-dimensional material microspheres; liquid nitrogen quick freezing to obtain two-dimensional material ice microspheres, and freeze-drying the two-dimensional material ice microspheres to obtain two-dimensional material airgel microspheres. The two-dimensional material airgel microspheres are reduced by a high-temperature thermal reduction method to obtain magnetically responsive two-dimensional material airgel microspheres. The preparation method of the invention has the advantages of simple operation, high production efficiency and safe and reliable production process.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a magnetically responsive two-dimensional material airgel microsphere and a preparation method thereof. Background technique [0002] Two-dimensional materials exhibit many peculiar properties because both carrier migration and heat diffusion are confined in a two-dimensional plane. Its adjustable band gap is widely used in fields such as field effect transistors, optoelectronic devices, and thermoelectric devices; the controllability of its spin degrees of freedom and valley degrees of freedom has attracted in-depth research in the fields of spintronics and valleytronics; different Two-dimensional materials have different electrical properties or anisotropy of optical properties due to the special properties of the crystal structure, including Raman spectroscopy, photoluminescence spectroscopy, second-order harmonic spectroscopy, optical absorption spectroscopy, t...

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Problems solved by technology

However, because the traditional two-dimensional material airgel microspheres only have excellent adsorption capacity and lack the ability to separate themselves from the environment after adsorption in an oil-water coexistence environment, their practical value is also greatly reduced. The ability of magnetic response endowed by gel microspheres can greatly enhance the practical application potential of two-dimensional materials in the fields of environment and energy catalysis, especially in oil-water separation. Therefore, micron-scale two-dimensional materials with magnetic response characteristics The research on the preparation of glue microspheres has extremely important value

Due to the structural characteristics of airgel itself (porosity over 90%) and physical properties (lightweight), regular mechanical methods such as ball milling and dispersion cannot obtain regular two-dimensional material airgel microspheres; on the other hand, previously reported The production process of the two-dimensional material airgel microspheres needs to use a large amount of organic reagents such as ethyl acetate and n-hexane, and also needs to use a large amount of liquid nitrogen, which will cause environmental pollution and consume energy extremely

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