Graphene sponge foam aerogel is a highly valuable three-dimensional porous nanomaterial. The reduction method, as the mainstream preparation process, has become the preferred method for scientific research and industrial production due to its strong process controllability and stable material properties. This material, with its ultra-lightweight, high porosity, high specific surface area, and excellent electrical conductivity and adsorption properties, is widely used in many high-end fields such as new energy storage, industrial environmental adsorption, precision thermal insulation, and flexible electronic devices. Our independently developed ultrasonic dispersion equipment is precisely adapted to the reduction method preparation process of graphene sponge foam aerogel, effectively solving core problems commonly found in traditional preparation processes, such as raw material agglomeration, uneven layer peeling, and numerous structural defects in the finished product, thus facilitating the preparation of high-quality graphene aerogel materials.
The core challenge in preparing graphene sponge foam aerogel by the reduction method lies in the uniform dispersion of the graphene oxide precursor. Strong van der Waals forces exist between graphene sheets, making them prone to stacking and agglomeration. Inadequate dispersion will directly lead to disordered pores and significant performance degradation in the subsequently reduced and formed material. Traditional mechanical stirring and low-speed dispersion equipment suffers from limited force and insufficient dispersion uniformity, failing to achieve nanoscale fine exfoliation and thus unable to meet the preparation standards of high-end graphene aerogels. Our ultrasonic dispersion equipment, relying on mature ultrasonic cavitation technology, generates multiple physical effects such as high-frequency micro-vibrations and micro-jets in a liquid phase system. This gently breaks down graphene aggregates, uniformly exfoliating sheets without damaging the graphene's bulk structure, laying a solid foundation for subsequent reduction and molding.
Graphene sponge foam aerogels prepared using this equipment's fine dispersion process consistently meet all core parameters, resulting in excellent product quality. The material sheet diameter is >500nm, the thickness is precisely controlled between 0.8-1.2nm, and the purity reaches approximately 99%, maximizing the preservation of graphene's excellent nanophysical properties. The overall density is as low as 18mg/cm³, exhibiting outstanding ultra-lightweight characteristics, making it suitable for various lightweight precision equipment applications. The finished products are well-proportioned, with standard dimensions of approximately 1 cm in diameter and 1.5 cm in height. They come in two forms: uniform cylindrical and regular fragmented. The material possesses a complete three-dimensional porous network structure with uniform pore distribution, free from defects such as voids, dense clumps, or sheet collapse.
This ultrasonic dispersion equipment is seamlessly compatible with the entire reduction process. Its pre-treatment for fine dispersion ensures full and comprehensive contact between the reducing agent and the graphene sheets, resulting in a more thorough and uniform reduction reaction, significantly improving the structural stability and performance consistency of the finished product. The equipment supports precise parameter control, adapting to various scenarios from laboratory sample development to industrial pilot production, effectively improving product yield, reducing raw material waste and production costs. It is a core supporting equipment for the large-scale, high-quality production of graphene sponge foam aerogel.
