38results about How to "Good paramagnetism" patented technology

The invention discloses a method for preparing a polyvinyl alcohol magnetic film, which comprises: dissolving egg albumen powder serving as a dispersant in deionized water, adding nanoscale Fe3O4 powder, and performing ultrasonic dispersion treatment to obtain a nano Fe3O4 aqueous solution system, wherein the mass ratio of the egg albumen powder to the Fe3O4 is 2:1; adding the system into aqueoussolution of polyvinyl alcohol to prepare a spinning solution, wherein the polyvinyl alcohol concentration of the spinning solution is 6 to 9 weight percent, and the Fe3O4 concentration is (0.2 to 4)*10<-3>g / mL; and obtaining a nano fiber-like polyvinyl alcohol magnetic film by using an electrostatic spinning process. In the invention, a nontoxic and nonirritating surface dispersant is used, the dispersion effect is desirable, the preparation process of the magnetic film is simple and the obtained magnetic film has stable performance and high magnetic performance.

The invention relates to a preparation method of a magnetic molecularly-imprinted polymer for separating and purifying ractopamine, aiming to solve the problem of leakage of magnetic ferroferric oxide in the processes of template elution and practical application of an existing magnetic ractopamine molecularly-imprinted polymer. The method comprises the steps of (1) preparing magnetic ferroferric oxide nano microspheres; (2) preparing an ATPS-modified ferroferric oxide material (ATPS-Fe3O4); (3) preparing a magnetic Fe3O4 functional monomer (MAC-ATPS-Fe3O4); (4) preparing a magnetic RAC molecularly-imprinted polymer (Fe3O4@MIPs). The prepared ractopamine magnetic molecularly-imprinted polymer disclosed by the invention is stable in performance, and can solve the problem of leakage of magnetic ferroferric oxide; the magnetic polymer has a relatively fast adsorption rate to ractopamine, meets the needs of rapid detection, has a rapid magnetic separation capacity, and is very suitable for field sample treatment.

The invention discloses a preparation method of Fe3O4 / Bi core-shell nanorods, adopting a two-step hydrothermal method, using a mixed solution of FeCl3·H2O, Na2SO4 and distilled water as a reaction source, heating at a high temperature of 165°C for 7 hours and then cooling to obtain Fe3O4 Nanorods, and then put the prepared Fe3O4 nanorods into a mixed solution of 0.01mol analytically pure Bi(NO3)3 and excess hydrazine hydrate, and react at 100°C for 12 hours to obtain Fe3O4 / Bi core-shell nanorods. The Fe3O4 / Bi core-shell nanorod produced by the invention is of high quality, not only has good paramagnetism, but also has a diamagnetic Bi shell layer deposited on the surface, so it has good biocompatibility and can be widely used in the field of medical testing.

The invention discloses a preparation method of magnetic nano-particles modified by aminogen. The preparation method comprises the steps that: (1) the alcoholysis of the magnetic nano-particles is carried out in a mixed solvent of toluene and low class monohydric alcohol, and surfaces of the magnetic nano-particles are coated by silica gel; the magnetic nano-particles coated by the silica gel areobtained; (2) the magnetic nano-particles coated by the silica gel react with a silane coupling agent, and the magnetic nano-particles coated by the silica gel with surfaces to modify an amino functional group are made. The invention also discloses a preparation method of an immunity magnetic nano separation agent which comprises the preparation method. The preparation method of the invention hasthe advantages of stable and moderate reaction system, simple and controllable operation and cheap agent material cost, and the waste reaction solution is easy to treat, and does not pollute environment. The preparation method is adapted to the industrial production. The magnetic nano-particles modified by aminogen has the advantages of small particle size, narrow distribution and good dispersibility, and the immunity magnetic nano separation agent has the advantages of high antibody combining rate, low non-specific binding rate, rapid magnetic separation, etc.

The invention discloses a terbium-containing borate compound. The chemical formula of the terbium-containing borate compound is Rb2LiTbB2O6. The invention also discloses a polycrystalline compound ofthe terbium-containing borate compound, an optical crystal, and a preparation method and application of the optical crystal. The polycrystalline compound can be used as a fluorescent powder matrix, and the optical crystal can be used as a magneto-optical crystal. The terbium-containing borate compound is simple in synthesis and low in cost, grows easily, and has important economic value and scientific research value in the field of solid-state illumination and magneto-optical materials.

The invention discloses a preparation method of magnetic citric acid modified chitosan microspheres, comprising (1) preparing water-based Fe 3 o 4 Nano magnetic material; (2) preparing citric acid modified chitosan; (3) preparing magnetic citric acid modified chitosan microspheres. By modifying chitosan with citric acid, chitosan and citric acid undergo acylation reaction to form secondary amide products and introduce carboxyl groups, which can not only increase the water solubility of chitosan, but also improve the resistance of chitosan to Adsorption properties of metal ions. The magnetic citric acid modified chitosan microspheres prepared by the invention can realize high-efficiency removal of Cr(VI) in waste water, and can also be regenerated and reused.