2results about How to "Good save" patented technology

The application provides a freeze-drying protective agent, a freeze-drying reagent and a preparation method thereof, and relates to the technical field of biology. The freeze-drying protective agent is composed of trehalose, mannitol or sorbitol, bovine serum albumin and PEG20000, and the composition is simple. The freeze-drying process parameters are optimized in the preparation method of the freeze-drying reagent by using the freeze-drying protective agent, the properties of the freeze-drying reagent are greatly improved, the stability of the freeze-drying reagent is ensured, the freeze-drying reagent obtained has the advantages of beautiful appearance, high integrity rate, stable enzyme activity, simple operation and the like, the preparation method of the freeze-drying reagent provided by the application is simple and feasible, the conditions are mild, the reproducibility is good, the controllability is strong, the method is suitable for large-scale production, and the freeze-drying reagent is more convenient for clinical use and storage.

The application belongs to the field of new energy materials, and provides a preparation method of stannous iodide, which comprises the following steps: adding hydriodic acid into ultrapure water to configure a solution A; adding a tin source into pure water, and then adding an antioxidant to form a solution B; adding the solution A into the solution B, heating and reacting, and then adding a reaction catalyst, stirring, and obtaining an orange-red solid; separating the orange-red solid from a liquid, washing, and vacuum drying to obtain a crude stannous iodide; performing a first heating process on the crude stannous iodide to separate the stannous iodide from oxidized impurities; and then performing a second heating process to obtain stannous iodide for perovskite batteries through high-temperature purification; wherein the tin source contains divalent tin ions. The preparation method has mild reaction conditions, simple raw material acquisition and preservation, high reaction efficiency, and the prepared finished product has high quality and high purity and is not easy to be oxidized, and is used in narrow-bandgap perovskite solar cells and laminated solar cells, and the photoelectric conversion efficiency is significantly improved.