5 results about "Sodium selenide" patented technology

This invention belongs to the technical field of sodium-ion battery electrode materials, specifically relating to a preparation method and application of an air-stable molten asphalt-coated sodium selenide composite cathode sodium replenisher. The invention first prepares pure-phase sodium selenide nanoparticles in a glove box by room temperature stirring. Then, asphalt is grown in situ on the surface of the sodium selenide through ball milling and high-temperature calcination, thereby forming a core-shell structured sodium selenide composite sodium replenisher material coated with molten asphalt. The resulting composite sodium replenisher is stable in air for extended periods without deterioration, while simultaneously reducing the decomposition potential of sodium selenide and improving its decomposition efficiency. Coupled with a layered oxide cathode, it can achieve cathode sodium replenishment, compensating for the loss of active sodium caused by the growth of the SEI film on the surface of the hard carbon anode. Furthermore, its decomposition product, selenium, can inhibit the lattice oxygen evolution of the layered oxide cathode, improving the structural stability of the cathode and thus effectively enhancing the battery's initial efficiency and cycle performance, demonstrating promising commercial application prospects.

The invention discloses an oxidative stress response nano preparation as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing sodium cocoyl glutamate and 2-amino-2-methyl-1-propanol with water, slowly dropwise adding isopropyl triisopropoxy silane, adding a mixed solution of N-(3-trimethoxysilylpropyl) urea, sodium selenide and isopropyl triisopropoxy silane, and stirring to form nanoparticles; (2) dispersing the nano-particles in a buffer solution containing lysozyme and esterase, and oscillating and incubating to obtain organic silicon nano-particles with hollow structures; and (3) dispersing the organic silicon nanoparticles in a dihydroquercetin solution, filtering, washing uncombined substances, and carrying out vacuum drying to obtain the oxidative stress response nano preparation. The preparation disclosed by the invention can trigger drug release through ROS in an oxidative stress environment, so that the targeting property of the drug in pathological tissues such as tumors and the treatment effect of the drug are improved, the influence on normal tissues is reduced, and the treatment safety of the drug is enhanced.

The invention discloses a selenized biomass carbon material and a preparation method thereof in the field of biomass carbon materials, and the method comprises the following steps: by taking tree fallen leaves as a biomass carbon source, after wall breaking and crushing, soaking the tree leaves in a sodium selenide / sodium selenite mixed solution at room temperature, so that selenium and a carbon skeleton form a C-Se bond, and selenylation is completed; and calcining in a nitrogen atmosphere to obtain the selenium-carbon material. And finally, adding the prepared selenium-carbon material into a mixed solution of organic acid and long-chain amine, soaking and activating to obtain the selenized biomass carbon material. The material has broad-spectrum antibacterial activity and excellent antioxidant activity at the same time. The raw materials are cheap and renewable, the whole process is environment-friendly, low in energy consumption and free of secondary pollution, the carbon neutralization strategy is met, the materials can be further processed into medical dressings, food fresh-keeping coatings, water purification filter elements or antioxidant packaging films, multiple purposes are achieved through one agent, and the industrialization prospect is clear.

The invention provides a preparation method and application of a high-activity nano-selenium solution, and the method comprises the following steps: dissolving sodium selenide powder in water under the protection of nitrogen to obtain a sodium selenide aqueous solution; adding gray black selenium powder into the sodium selenide aqueous solution, and fully reacting to obtain a sodium polyselenide aqueous solution; adding an emulsifier and chloroform into the sodium polyselenide aqueous solution, and fully dispersing to obtain a sodium polyselenide mixed solution; after a demulsifier is added into the sodium polyselenide mixed solution, the sodium polyselenide mixed solution is layered, upper-layer liquid and lower-layer liquid are included, and the upper-layer liquid and the lower-layer liquid are separated; and adding water into the subnatant to fully disperse, and distilling to obtain a red nano-selenium solution after the distillation is finished. The operation for preparing the nano-selenium solution is simple, the preparation yield of the nano-selenium is high, and the sodium selenide solution used in the nano-selenium preparation process can be reused.

The invention discloses a simple preparation and separation method of high-valence selenium and low-valence selenium in the technical field of feeds and fertilizers, which comprises the following steps: by taking elemental selenium and sodium hydroxide or potassium hydroxide as raw materials, generating a mixed solution of sodium selenide and sodium selenite in one step through disproportionation reaction, and then connecting-2-valence selenium to starch molecules through nucleophilic addition reaction to obtain the high-valence selenium and low-valence selenium. The method comprises the following steps: by taking selenium as a raw material, generating a high-stability selenized starch material, and carrying out solid-liquid separation to respectively obtain the selenized starch material and a selenite-containing mother solution, thereby realizing the separation of high-valence selenium and low-valence selenium. The selenized starch material can be used for producing selenium-rich feed, and tetravalent selenium in the solution can be used for producing selenium-rich compound fertilizer. The method has the advantages of short process flow, simple operation, no need of introduction of complex reagents or expensive equipment and low cost, and avoids the regeneration of selenium elementary substance by the neutralization reaction through the separation technology. The method provides a new technical path for realizing high-valued utilization of selenium.