3results about How to "Regular crystal form" patented technology

The invention relates to a preparation method of an isomaltulose crystal. The preparation method of the isomaltulose crystal comprises the following steps: (1) stirring and mixing a sucrose solution and sucrose isomerase; (2) adding an isomaltulose seed crystal, feeding cane sugar, and keeping stirring in the whole process; and (3) performing centrifugal separation to obtain isomaltulose crystals. According to the method, sucrose isomerism is carried out by adopting sucrose isomerase to obtain isomaltulose, isomaltulose crystal seeds are added in the conversion process, meanwhile, the sucrose is fed, the conversion and crystallization processes are carried out at the same time, isomaltulose gradually generated through conversion grows on the crystal seeds at the same time, and the obtained crystals are regular in crystal form, high in purity and uniform in particle size.

The present invention discloses a long afterglow material based on the MOF template method, and a preparation method and application thereof. The preparation method of the present invention comprises the following steps: (1) preparing a MOF template: uniformly mixing a porphyrin derivative and a metal source in a solvent, and obtaining a MOF template through a hydrothermal reaction; (2) preparing a precursor: dispersing the MOF template obtained in step (1) in the solvent again, adding a chromium source, mixing for a period of time, separating to obtain a precipitate, and freeze-drying to obtain the precursor; (3) subjecting the precursor obtained in step (2) to high-temperature treatment in an air atmosphere to obtain the long afterglow material. The present invention uses MOF as a precursor, which can well arrange the spatial distribution and element ratio of metal ions, thereby obtaining a long afterglow material with a more regular crystal form and a more uniform element distribution during the calcination process, which is beneficial to the formation of lattice defects inside the system, thereby improving the brightness of the afterglow material and the duration of the afterglow.

This invention discloses a low-temperature solid-phase synthesis method for manganese tetroxide, belonging to the field of inorganic functional material preparation technology. The preparation method includes: preparing a targeted organic ammonium salt surface modifier; preparing a composite precursor by high-energy ball milling of a manganese source (γ-type MnOOH) and a rhombohedral MnCO3, a modifier, and a composite auxiliaries; obtaining a crude product through a low-temperature solid-phase reaction at 220-350℃ under a nitrogen or argon inert atmosphere; and obtaining the final product through fluidized bed desorption, air jet milling depolymerization, sieving, acid washing, and vacuum drying. To address the shortcomings of existing solid-phase synthesis methods, such as high energy consumption, easy generation of impurities, and product agglomeration, this invention proposes a synergistic regulation and low-temperature solid-phase synthesis technology. Through specific manganese source formulation and the synergistic effect of modifiers and auxiliaries, pure-phase synthesis at 220-350℃ is achieved, solving problems such as high-temperature dependence and impurity phase formation. The product has a regular crystal structure, high purity, and good dispersibility, making it suitable for high-end lithium-ion battery cathode materials and other applications. The process is energy-efficient and environmentally friendly.