6results about How to "High absorption strength" patented technology

This invention belongs to the field of high-entropy ceramic materials technology, and discloses a perovskite ceramic material, its preparation method, and its application. The general chemical formula of the perovskite ceramic material of this invention is: (Ba y1 Sr y2 Ca y3 )Fe x O3, where x = 0.5–1.5, y1 = y2 = y3 = 0.2–0.4. The resulting perovskite-type ceramic material, when composited with paraffin at a mass ratio of 9:1 and a thickness of 1.2 mm, exhibits an absorption bandwidth of 4.16 GHz and a minimum reflection loss of -40.58 dB, demonstrating a wide effective absorption bandwidth and high absorption intensity even at low thicknesses. Furthermore, the material preparation method uses water as a solvent, eliminating the need for highly toxic chemical reagents, making it environmentally friendly and pollution-free. The preparation process is simple, low-cost, and suitable for large-scale industrial production.

The invention relates to an optical nonlinear operation device, an optical nonlinear operation assembly and a preparation method of a fluorescent material. The optical nonlinear arithmetic device comprises a fluorescent material layer and a reflecting layer, wherein the fluorescent material layer covers one side of a reflecting surface of the reflecting layer; the fluorescent material layer comprises a fluorescent material, the fluorescent material layer is used for absorbing part of incident laser emitted by the incident light source, and the service life of the fluorescent material is 1 nanosecond to 50 microseconds; the reflecting layer comprises a plane reflecting mirror and is used for reflecting the rest of incident laser emitted by the incident light source except for part of the incident laser. By adopting the device provided by the invention, the calculation effect of optical calculation can be improved.

The utility model discloses a segmented rapid scanning system using an external cavity quantum cascade laser, which belongs to the technical field of infrared spectrum rapid scanning and comprises a laser emission system, a control system, an ultrasonic injection system, a reference system, a calibration system and an information collection system. The control system is respectively connected with the laser emission system, the ultrasonic injection system and the information collection system, infrared light emitted by the laser emission system is divided into three paths through the beam splitter, the three paths of infrared light enter the ultrasonic injection system, the reference system and the calibration system respectively, and the ultrasonic injection system, the reference system and the calibration system are further connected with the information collection system. By adopting the structure, the system can work at room temperature by using the external cavity quantum cascade laser, the resolution ratio of a measured spectral line is improved, the astigmatism type multi-pass absorption cell is used, the mirror surface space can be utilized to the maximum extent, the absorption intensity of the spectral line is improved, scanning can be rapidly completed, and collection is convenient.

The application provides a magnetic metal powder / porous carbon composite material, a preparation method and application thereof. The preparation method comprises the following steps: step S1, performing surface oxidation reaction on a magnetic carbonyl metal powder to form pretreated metal powder; step S2, dissolving a copolymer PS n -b-PEO m in a first solvent, adding a mixed solution of ethanol and water into the first solvent to obtain a milk emulsion; step S3, adding the pretreated metal powder, pyrrole and FeCl3 into the milk emulsion to perform in-situ polymerization reaction, so as to form a precursor and obtain a precursor solution; step S4, removing the spherical PS n -b-PEO m micelles in the precursor by a solvothermal method, and then drying to obtain a porous precursor; and step S5, calcining the porous precursor under an inert atmosphere to obtain the magnetic metal powder / porous carbon composite material. The magnetic metal powder / porous carbon composite material prepared by the application has better wave absorption performance in a low frequency band.

The invention discloses a NiCo-MOF derived carbon nanotube wave-absorbing material with a core-shell structure and a preparation method of the NiCo-MOF derived carbon nanotube wave-absorbing material, and relates to the technical field of wave-absorbing materials. According to the method, NiCo-MOF with a core-shell structure is obtained by controlling the solvent proportion, then a carbon nano tube grows on the surface of the NiCo-MOF in situ, the prepared MOF-derived carbon nano tube has a hollow core-shell structure, and the surface of the MOF-derived carbon nano tube is covered with a layer of dense carbon nano tube. By adopting the structure, the conductivity of the material is greatly improved, the types of interface polarization are enriched, and good wave absorbing performance is shown in the frequency band of 2-18 GHz; the hollow structure is beneficial to multiple reflection of electromagnetic waves inside, and when the matching thickness is 2.5 mm, the effective absorption bandwidth can reach 5.7 GHz, and the minimum absorption peak reaches 4.8 GHz. The method is simple in technological process, low in cost and suitable for large-scale preparation, and has wide application prospects in the fields of light broadband wave absorption, thermal protection and the like.

This invention discloses a rare-earth co-doped TiO2 photocatalyst and its preparation method. The photocatalyst structure includes: a TiO2 crystal matrix, a rare-earth ion doped layer doped within the TiO2 crystal lattice, a transition control layer distributed in the middle region of the TiO2 crystal, a surface-active layer enriched on and near the surface of the TiO2, and a mesoporous structure formed within the TiO2. The rare-earth doped layer in the TiO2 is used to suppress photogenerated electron-hole recombination, the transition control layer is used to regulate carrier migration, the surface-active layer is used to enhance the adsorption and interfacial reaction capabilities of organic pollutants, and the mesoporous structure is used to improve the diffusion efficiency of pollutant molecules. Through a multi-layered synergistic structural design, this invention improves the utilization efficiency of photogenerated carriers while maintaining the ultraviolet photocatalytic ability of TiO2, significantly enhancing the degradation and deodorization performance of organic pollutants.