18 results about "Rhombic dodecahedron" patented technology

The invention provides a preparation method of carbon-loaded MOF (Metal Organic Framework) derivative aerogel. The preparation method comprises the following steps: S1, preparing ZIF-67 with a rhombic dodecahedron structure; s2, preparing cellulose aerogel; s3, preparing a ZIF-67 at cellulose compound by using the ZIF-67 with the rhombic dodecahedron structure and the cellulose aerogel; s4, the ZIF-67 at cellulose compound is carbonized, and the carbon-loaded MOF derivative aerogel is obtained. The problems that in the prior art, a wave-absorbing material is poor in performance, does not have good heat insulation performance, and is high in raw material cost are solved.

The invention discloses multi-adsorption-site nitrogen-doped porous carbon, a preparation method and application in iodine adsorption, and the preparation method comprises the following steps: carrying out primary calcination on a zeolite imidazate framework material, mixing with potassium hydroxide, and then carrying out secondary calcination to obtain the multi-adsorption-site nitrogen-doped porous carbon. According to the invention, a zeolite imidazate framework material is used as a precursor, potassium hydroxide is introduced for high-temperature calcination activation treatment, the obtained product inherits a rhombic dodecahedron framework of ZIF-8, a continuous through pore system and a nitrogen-doped carbon material with high pyrrole nitrogen content are formed, and the static adsorption capacity of the nitrogen-doped carbon material to iodine can reach 7.99 g / g.

The invention discloses a Zn-N-C piezoelectric material with rhombic dodecahedron morphology and a preparation method and application thereof.The method comprises the steps that zinc salt and 2-methylimidazole are stirred in a mixed solution of methyl alcohol and ethyl alcohol at the room temperature, and after the reaction is finished, post-treatment is conducted to obtain a Zn-MOF precursor; and grinding the Zn-MOF precursor to prepare fluffy powder, heating the obtained fluffy powder to 900-1000 DEG C at a heating rate of 5 DEG C / min, then keeping at 900-1000 DEG C in the presence of flowing inert gas, and after the reaction is finished, naturally cooling to room temperature to obtain the Zn-N-C piezoelectric material. The Zn-N-C piezoelectric material prepared by the invention shows excellent catalytic degradation performance when being used for treating different types of phenolic pollutants, and can keep efficient degradation capacity in a wide range of pH (Potential of Hydrogen) of 5-9, so that the material shows important application value in the field of advanced treatment of industrial wastewater.

The application relates to a design method of a layered porous structure of an acetabular cup and the acetabular cup, and the method comprises the following steps: modeling a plurality of rhombohedrons, so that the pore diameter is 500-1200 mu m and the porosity is 60%-90%; generating a cubic array from the rhombohedrons, introducing a simulation calculation software, and performing compression finite element simulation on the cubic array to obtain the compression strength and the elastic modulus of the cubic array; selecting a cubic array meeting the human bone performance, arraying the rhombohedron with the largest pore diameter in the cubic array to obtain an outer porous coating area capable of accommodating the acetabular cup; selecting the rhombohedron with the largest porosity to obtain an inner porous coating area capable of accommodating the acetabular cup; and then performing a Boolean operation on the two array bodies and the outer porous coating area and the inner porous coating area of the acetabular cup respectively to obtain an intersection, so that the layered porous structure of the acetabular cup is finally obtained. The acetabular cup obtained by the method can provide stability after implantation.

The present invention provides a spacecraft support and a spacecraft based on a lightweight vibration reduction and isolation lattice structure, and relates to the field of aerospace technology. The spacecraft support is formed by a plurality of spatially periodically arranged cell structures, and the outline of the cell structure forms a rhombus dodecahedron; the rhombus dodecahedron includes eight first vertices, two second vertices and four third vertices, wherein the first vertex is formed by the intersection of three obtuse angles of rhombuses; the second vertex and the third vertex are both formed by the intersection of four acute angles of rhombuses, and the two second vertices are opposite; the cell structure includes eight first straight rods, eight second straight rods, eight first vibrators, four third vibrators and sixteen springs, each first vibrator is located at a corresponding first vertex, and each third vibrator is located at a corresponding third vertex; one end of each first straight rod intersects with the body center of the rhombus dodecahedron, and the other end is connected to the corresponding first vibrator. The spacecraft support has a good vibration reduction and isolation effect on the basis of lightweight.

The application relates to the technical field of hydraulic pump additive manufacturing, and discloses a preparation process of a light-weight hydraulic pump shell based on SLM technology, which uniformly selects TC4 metal powder as base material and shell material of the light-weight shell, sets up a recycled powder collecting container in a powder preparation area, establishes a mixing use specification of new powder and recycled powder, realizes efficient recycling and full life cycle traceability of the powder, finally reduces manufacturing cost and waste emission, fills a non-bearing area by adopting a rhombic dodecahedron or a gyroscopic lattice structure, removes low stress material in combination with topological optimization, can reduce the weight of the shell as a whole, directly integrates a hydraulic flow channel in the shell, can effectively avoid the additional requirement of wall thickness of a traditional drilling process, reduces flow channel pressure loss, and effectively improves the power to weight ratio and dynamic response performance of the hydraulic pump.

The application discloses a preparation method of a rhombic dodecahedron cavity structure electromagnetic wave absorber Fe / ZnO@C, and belongs to the technical field of composite materials, and comprises the following steps: firstly, synthesizing magnetic Fe3O4 particles; then, preparing a precursor Fe3O4@ZIF-8; coating the surface of the Fe3O4@ZIF-8 with polydopamine to obtain Fe3O4@ZIF-8@PDA; and finally, obtaining a rhombic carbon shell coated zinc-iron alloy through high-temperature carbonization treatment. The Fe / ZnO@C composite with a rhombic dodecahedron cavity structure is prepared by using a three-step method, and has excellent electromagnetic wave absorption performance. The preparation process is simple, and the method is suitable for large-scale production; and the material structure is novel, the density is relatively small, and the product has excellent performance.

The present invention provides a one-dimensional N-doped carbon nanorod material. Zn(CH3COO)2·2H2O, CTAB, dimethylimidazole, and deionized water are uniformly mixed and subjected to a hydrothermal reaction. The dried product is calcined at different temperatures under a nitrogen atmosphere. The present invention prepares a one-dimensional rod-shaped ZIF-8, which is different from the traditional rhombic dodecahedron shape. The one-dimensional N-doped carbon nanorod absorber is obtained by high-temperature calcination. The present invention is simple and easy to operate, low in cost, and has excellent absorbing performance, a wide bandwidth, and a thin thickness. The low-dielectric network formed by the interlaced one-dimensional rod-shaped structures effectively improves impedance matching and effectively enhances the absorbing performance of the material.

The invention relates to a space curved reticulated shell structure formed by stacking and combining rhombic dodecahedrons, comprising a one-way curved reticulated shell structure, a positive curvature two-way curved reticulated shell structure and a negative curvature two-way curved reticulated shell structure, the array combined revolution body is generated by rotating the orthogonal array combination body around the space rotation axis by a certain angle; boundary cutting structures are generated by the plane boundary in span direction or the curved boundary in span direction cutting the array combined revolution body; the plane boundary cutting structure respectively generates a one-way curved reticulated shell structure, a positive curvature two-way curved reticulated shell structure and a negative curvature two-way curved reticulated shell structure respectively through one-way bending arching, positive curvature two-way bending arching and negative curvature two-way bending arching.

The application discloses a rhombicuboctahedron mobile robot, which comprises first to sixth vertex units and first to twelfth driving units, the first to sixth vertex units are connected through the driving units, in the initial state, each unit presents a quadrilateral shape, the whole robot is in the shape of a rhombicuboctahedron, a deformation mode of face center driving is adopted, the deformation of each single degree of freedom quadrilateral unit is realized by controlling the steering angle of a steering wheel, and then the overall deformation is realized, the robot can roll and move by taking the triangular face composed of the quadrilateral link units or the rods as support, rich deformation and movement modes can be realized, the spherical shape can make the robot realize rapid movement, and the grid structure makes the robot have high rigidity and environmental adaptability, and the application can be used for unmanned detection tasks in a field environment.

The invention discloses a preparation method of cesium iodide, cesium iodide and application, and relates to the technical field of inorganic materials. According to the preparation method disclosed by the invention, the original crystal form morphology of cesium iodide is changed by adding a specific type of surfactant and using a high-temperature and high-pressure hydrothermal reaction, so that polyhedral crystal forms such as a truncated octahedron, a cube and a rhombic dodecahedron are formed, the specific surface area of cesium iodide is further increased, a larger contact area can be provided, and the stability of a product is improved; and the solubility of cesium iodide in an organic solvent can be improved, and the application effect of cesium iodide in a perovskite material is improved.

The invention provides a spacecraft support based on a lightweight vibration reduction and isolation lattice structure and a spacecraft, and relates to the technical field of spaceflight. The spacecraft support is formed by a plurality of cell element structures which are periodically arranged in space, and the outlines of the cell element structures form a rhombic dodecahedron; the rhombic dodecahedron comprises eight first vertexes, two second vertexes and four third vertexes, and each first vertex is formed by intersection of obtuse angles of three rhombuses; the second vertexes and the third vertexes are formed by intersection of acute angles of four rhombuses, and the two second vertexes are opposite to each other; the cell structure comprises eight first straight rods, eight second straight rods, eight first vibrators, four third vibrators and sixteen springs, each first vibrator is located at a corresponding first vertex, and each third vibrator is located at a corresponding third vertex; one end of each first straight rod intersects at the body center of the rhombic dodecahedron, and the other end of each first straight rod is connected to the corresponding first vibrator. The spacecraft support is good in vibration reduction and isolation effect on the basis of light weight.

The present invention discloses a preparation method of a ZIF-8-derived highly dispersed bimetallic Fe-Ni-N-C material. Using zinc nitrate, iron nitrate, and 2-methylimidazole as raw materials, combined with a methanol solution, the precursor Fe-ZIF-8 is synthesized. Then, metal Ni is added through a dual-solvent method to highly disperse the bimetallic Fe and Ni in the framework ZIF-8. The Fe-Ni-N-C material is used to activate PMS for the degradation of tetracycline in water. The characteristics of the present invention are as follows: The Fe-Ni-N-C material presents a regular rhombic dodecahedron structure with a large specific surface area; the ZIF-8 framework structure improves the loading effect of the bimetallic Fe and Ni, has high stability, and is environmentally friendly; the bimetallic cooperation is more likely to activate PMS, and the catalytic degradation performance is ideal; it has highly dispersed bimetallic active sites, can efficiently activate PMS for the degradation of tetracycline in water in small amounts, and reduces the consumption costs of PMS and the material itself.

The present invention discloses a photocatalyst for reducing low-concentration carbon dioxide and a preparation method thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: dissolving a cobalt source and dimethylimidazole in an organic solvent to obtain solution A, reacting, and obtaining a precipitate, namely the rhombic dodecahedron Co-metal organic framework; dissolving a nickel source and an aluminum source in an organic solvent, and then mixing with the rhombic dodecahedron Co-metal organic framework to obtain solution B, reacting, and obtaining a precipitate, namely the hollow multi-stage CoNiAl-LDHs photocatalyst. The present invention uses the rhombic dodecahedron Co-metal organic framework as a template, introduces Ni and Al by a self-etching method, and constructs a hollow multi-stage CoNiAl-LDHs nanoflower-shaped photocatalyst containing different electronic states. In production and application, the preparation method of the present invention is simple and novel, has low synthesis cost, is easy to mass produce, and has good application value.

The three-dimensional lattice structures disclosed herein have applications including use in medical implants. Some examples of the lattice structure are structural in that they can be used to provide structural support or mechanical spacing. In some examples, the lattice can be configured as a scaffold to support bone or tissue growth. Some examples can use a repeating modified rhombic dodecahedron or radial dodeca-rhombus unit cell. The lattice structures are also capable of providing a lattice structure with anisotropic properties to better suit the lattice for its intended purpose.

This invention discloses a microstructure for bone implants enhanced by polycrystalline doping, comprising a soft-phase cell structure, a hard-phase cell structure, and a soft-hard phase doped structure. The soft-phase core and hard-phase shell are combined, with each cell of the hard-phase shell structure on the outside of the soft-phase core structure having a completely overlapping cross-section with the corresponding circumscribed cube of the soft-phase core structure, forming a face-to-face bond that constructs a soft-hard phase doped structure where the hard-phase shell completely encloses the soft-phase core. The elastic modulus can be effectively increased by 1.5-1.75 times while maintaining a basically identical stress-strain curve shape. Under high porosity, the stress-strain curve of 8.3% hard-phase reinforcement approximates a standard rhombic dodecahedron, except for the increased elastic modulus, the curve is similar to a standard rhombic dodecahedron. The advantage of 50% hard-phase reinforcement is that the composite structure model has better overall mechanical properties. 8.3% hard-phase reinforcement saves approximately 13% of material while maintaining a basically identical stress-strain curve to the control group, while 50% hard-phase reinforcement saves approximately 25% of material.

The invention discloses a modulus-controllable bionic gradient porous medical titanium alloy and an additive manufacturing process method thereof, and relates to the technical field of medical materials.The titanium alloy is formed by stacking a plurality of rhombic dodecahedron structures in the vertical direction; the rhombic dodecahedron structure is formed by stacking a plurality of rhombic dodecahedron structure layers with the same area, and each rhombic dodecahedron structure layer is formed by arranging a plurality of rhombic dodecahedron unit cell structures in an array mode in the same horizontal plane. And the top distances of the rhombic dodecahedron unit cell structures in the rhombic dodecahedron structures from top to bottom are sequentially increased. The elastic modulus can be effectively reduced to 0.14-0.43 GPa, the elastic modulus of the whole structure can be accurately controlled, and the stress shielding effect of the bone graft is relieved.

A method for preparing self-assembled spherical superlattice microcavity from synthetic rhombic dodecahedron nanocrystals, the method comprises the following steps: prolonging annealing time through hot injection method to obtain rhombic dodecahedron CsPbBr3 nanocrystals with good monodispersity, dispersing the nanocrystals in toluene solution after centrifugal separation and purification, dropping appropriate diluted nanocrystal solution on a substrate, slowly evaporating at low temperature, and self-assembling the rhombic dodecahedron nanocrystals in the solution into superlattice with regular morphology structure under the interaction between ligands and ligands and between solvent and ligands. The size of the self-assembled superlattice structure is approximately several hundred nanometers to several microns. The regular rhombic dodecahedron nanocrystals have good application prospect in the field of photocatalysis and display due to their weak size limitation effect and multi-faceted nature; meanwhile, the spherical superlattice has a high packing factor due to the close packing of its structure, and can form a microcavity as an optical feedback surface in combination with the regular geometric morphology of the self-assembled superlattice structure.