8 results about "Gadolinium chloride" patented technology

The invention discloses a rare earth modified silicone rubber anti-radiation adhesive and a preparation method thereof, and the rare earth modified silicone rubber anti-radiation adhesive is prepared by mixing dealcoholized single-component room temperature vulcanized silicone rubber and an anti-radiation rare earth compound according to a ratio of 92-98 wt%: 2-8 wt%, the anti-radiation rare earth compound is prepared by mixing a mixed rare earth compound, deionized water and a composite rare earth coupling agent according to the mass ratio of 10: 90: 0.08, and the mixed rare earth compound is prepared by reacting raw materials including gadolinium chloride, samarium chloride, europium chloride, boric acid and deionized water. The neutron relative attenuation rate of the adhesive can reach 71-85%, the gamma ray relative attenuation rate of the adhesive can reach 88-95%, only microcracks appear on the surface after radiation, and the adhesive is easy to construct, can be used for aerospace circuit boards, equipment circuit boards in nuclear energy facilities and parts needing anti-radiation protection and the like, and has good practicability and popularization value.

The invention belongs to the field of rare earth afterglow luminescent materials. The invention discloses a high-brightness divalent rare earth afterglow material. The molecular formula of the high-brightness divalent rare earth afterglow material is BaFCl: Gd / Li / Sm. The preparation method sequentially comprises the following steps: uniformly mixing and grinding barium fluoride, barium chloride, gadolinium chloride, samarium chloride and lithium chloride in proportion, carrying out high-temperature reaction in a tubular furnace, and carrying out heat preservation in a drying oven to obtain a product. The product has the characteristics that the product has very strong afterglow performance under X-ray excitation, the afterglow luminescence brightness value can reach 4.53 cd m <-2 >, the afterglow duration is longer than 100 hours, and the product has a very good application prospect in the field of delayed X-ray imaging.

The invention provides a pressure heating refrigeration working medium based on solid-liquid phase change. The pressure heating refrigeration working medium comprises water and gadolinium chloride which serves as a nucleating agent and is dissolved in the water. According to the application of the water-based system serving as the pressure heating refrigeration working medium, refrigeration is conducted through latent heat of the water-based system in the solid-liquid phase change process, and the water-based system comprises water and a nucleating agent dissolved or dispersed in the water. The water-based system provided by the invention is a typical primary phase change material, phase change causes huge phase change latent heat and entropy change, and the entropy change in the phase change process can reach 1170 J. Kg <-1 >. K <-1 >. Meanwhile, the hysteresis of the material is small, the minimum thermal hysteresis can be as low as 8 K, the phase change of the material is sensitive to hydrostatic pressure, and the isothermal entropy change under the small pressure of 0.1 GPa exceeds 1030 J.kg <-1 >. K <-1 > and is far higher than that of all reported materials at present. And the water can realize a large pressure heating effect under small pressure, so that the device has a huge potential application value in pressure heating refrigeration and heat management technologies.

The embodiment of the invention provides a precursor solution, a perovskite absorption layer and a preparation method and application of the perovskite absorption layer. The precursor solution comprises an organic salt, a metal chloride hydrate and a solvent. The metal chloride hydrate comprises any one or a combination of at least two of neodymium chloride hexahydrate, ruthenium chloride hydrate, nickel chloride hexahydrate, cobalt chloride hexahydrate and gadolinium chloride hexahydrate. Metal chloride hydrate is added into a precursor solution, so that water molecules in the metal chloride hydrate can be separated from the precursor solution of the perovskite solution in the preparation process of the perovskite absorption layer, a proper amount of humidity is provided for high-quality growth of perovskite, and perovskite can be immediately annealed after spin coating in a glove box is completed; according to the method, space transfer is not needed, the inert atmosphere of the glove box is not damaged, repeatability can be improved, the grain size of perovskite crystals and the quality of a perovskite absorption layer are guaranteed, and therefore the performance of the perovskite cell is further improved.

The invention discloses a bimetal oxide nanoprobe based on BSA biomimetic mineralization and a preparation method and application thereof, and relates to the technical field of nanoprobes. The preparation method of the nanoprobe comprises the following steps: (1) respectively dissolving gadolinium chloride hexahydrate and manganese chloride in triple distilled water to obtain a gadolinium chloride solution and a manganese chloride solution; and (2) adding a gadolinium chloride solution and a manganese chloride solution into the bovine serum albumin solution under a stirring condition at room temperature to form a mixed solution, adjusting the pH value to 12, reacting, and purifying and freeze-drying to obtain the bimetal oxide nanoprobe based on BSA biomimetic mineralization. According to the invention, a long-acting time window is realized by utilizing long blood metabolism, and is passively enriched into a middle tumor microenvironment through an EPR effect, and a T1WI magnetic resonance imaging signal which is disintegrated and intensified at a tumor position is responded in a weakly acidic tumor microenvironment, so that accurate diagnosis of tumors is realized.

The application belongs to the technical field of refractory materials, and particularly relates to a magnesium-based refractory material for a zinc-extraction rotary kiln and a preparation method thereof. The magnesium-based refractory material is composed of the following components in percentage by weight: magnesia-alumina spinel 10-16 wt%, modified alumina 6-11 wt%, silicon carbide 4-7 wt%, and composite binder 2-4 wt%, with the balance being magnesite. The modified alumina is prepared by the following process: adding aluminum chloride, gadolinium chloride and glucose into ethanol, heating and stirring, then adding alumina particles and ultrasonic dispersing, filtering and drying to obtain alumina particles coated with a precursor; and calcining the alumina particles coated with the precursor under an argon atmosphere to obtain the modified alumina. The magnesium-based refractory material has excellent normal-temperature mechanical properties and high-temperature mechanical properties, and good thermal shock resistance.

The invention discloses an amorphous rare earth metal oxide coupled low-platinum-based catalyst and a preparation method and application thereof.The preparation method comprises the steps that gadolinium chloride and potassium tetrachloroplatinate serve as metal sources, carbon black serves as a carrier, an amorphous Gd2O3 / C nano material is prepared in advance through a wet chemical method and high-temperature oxidation, then physical adsorption is conducted firstly, and then the amorphous Gd2O3 / C nano material is subjected to high-temperature oxidation to prepare the amorphous rare earth metal oxide coupled low-platinum-based catalyst. And loading platinum nano particles on the amorphous Gd2O3 / C nano material in a post-heat treatment manner to obtain the Pt-Gd2O3 / C catalyst material. According to the preparation method disclosed by the invention, the low-load platinum nanoparticles are loaded on the amorphous gadolinium oxide nano-carrier, the adsorption effect of the reaction intermediate of the alkaline hydroxide reaction (HOR) is coordinated and optimized by utilizing the high-activity effect of the platinum nanoparticles and the efficient charge transfer effect of the amorphous gadolinium oxide, and the CO poisoning resistance of the material is improved; and finally, the catalytic activity of the alkaline HOR is improved.

The invention provides a preparation method of a fiber reinforced Gd2O3-Al2O3 aerogel composite material with heat insulation and neutron shielding functions. The method comprises the following steps: firstly, preparing a composite material by using a sol-gel method, a vacuum impregnation method and a normal-pressure drying method, uniformly mixing and stirring absolute ethyl alcohol and ultrapure water, then gradually adding aluminum chloride hexahydrate and gadolinium chloride hexahydrate into the composite material, and after the solution is uniformly stirred, slowly adding epoxypropane and uniformly mixing; performing vacuum impregnation on the mixed solution into mullite fibers; after aging and solvent replacement are performed on the compound, normal-pressure drying is performed, and finally high-temperature heat treatment is performed to obtain the composite shielding material. A one-step mixing method is adopted in the preparation process of the composite material, meanwhile, no catalyst needs to be added, the cost is low, the material surface is smooth, the thickness is controllable, the apparent density ranges from 0.28 g / cm < 3 > to 0.41 g / cm < 3 >, the temperature resistance under the air atmosphere reaches 1000 DEG C, the minimum room-temperature heat conductivity is 0.041 W / m.K, the maximum thermal neutron shielding rate can reach 84.353%, and the mechanical strength is high.