Hebei Messi Biology Co., Ltd. stated that magnesium oxide is a very important industrial raw material and is widely used in metallurgy, ceramics, catalysis, coatings, medicine, adsorption materials, refractory materials and optical materials. With the development of science and technology, magnesium oxide with different structures and functions has been continuously developed, including high-purity magnesium oxide for energy-saving lamps and plasma displays, porous magnesium oxide for catalysis and biological gene repair, magnesium oxide single crystals for low-temperature optical devices and high-temperature superconducting devices, etc.
In recent years, due to its many optical, electrical, magnetic, thermal, chemical and mechanical properties different from bulk magnesium oxide, nano magnesium oxide has become a new functional inorganic material, showing potential application prospects in many fields, especially in the field of antibacterial materials closely related to human survival and health. It has shown unique advantages. Nano magnesium oxide has the advantages of low toxicity, high heat resistance, environmental friendliness, long-lasting and broad-spectrum antibacterial properties. It can overcome the problems of high cost, easy discoloration, poor stability and biological toxicity of silver-based antibacterial materials, and can also make up for the low antibacterial efficiency and dependence on ultraviolet light of photocatalytic antibacterial materials. It has become a hot research topic in the field of antibacterial materials. The use of antibacterial materials to inhibit or kill bacteria is of great significance for preventing the spread and infection of bacteria, improving environmental hygiene and protecting human health. Compared with traditional magnesium oxide, nano magnesium oxide has more active oxygen and lattice defects on its surface. Such adsorption and surface reaction centers can effectively produce superoxide anion radicals O2-, which have strong oxidizing properties and can destroy the protein peptide chains of bacterial cell membrane walls, thereby quickly killing bacteria. Therefore, the development of nano magnesium oxide-based antibacterial materials is of great significance.
The existing production and preparation of nano magnesium oxide mainly includes traditional technical routes such as sol-gel method and precipitation method, and the final products are all powdered. The application of magnesium oxide in end products also requires further molding of magnesium oxide or coating it on the surface of the substrate to achieve practical application purposes. The most widely used process route today is to make a slurry of nano magnesium oxide and coat it on the surface of a substrate (metal filter membrane, polymer filter membrane, etc.). Due to the weak bonding force between the powder and the substrate, its mechanical stability is poor; the coating thickness is uneven and only the surface layer has an antibacterial effect, and a large number of deep-coated nanoparticles fail to fully play their role.
The present invention discloses a method for preparing a sheet-like magnesium oxide or a doped magnesium oxide array, which includes: (1) cleaning the substrate;
(2) preparing a growth solution;
(3) a growth reaction;
(4) cleaning and drying;
(5) high-temperature post-treatment.
The present invention aims at the problems encountered in the application of existing nano magnesium oxide particles, and directly adopts hydrothermal growth technology to grow magnesium oxide nano-sheet arrays in situ on the surface of commercial substrates (metal, ceramic and polymer fiber), thereby producing nano-array-based magnesium oxide antibacterial materials. Its new magnesium oxide nano-array-based film has excellent mechanical stability, unique array space structure, large specific surface area and rich pore structure.