9 results about "Bipyramid" patented technology

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate based on a functionalized gold nano bipyramid (at) covalent organic framework as well as a preparation method and application of the SERS substrate, and belongs to the technical field of analysis and detection. The SERS substrate comprises a carrier and an AuNBPs (at) COF composite material loaded on the carrier, the AuNBPs (at) COF composite material comprises a gold nano bipyramid located in a core and a COF shell layer wrapping the gold nano bipyramid, the COF shell layer can efficiently enrich DA molecules and separate matrix impurities, and AuNBPs plays a role in SERS signal enhancement. According to the collaborative design of AuNBPs enhancement-COF recognition, the problems that the saxitoxin content is low, background interference is complex, and domoic acid toxin is difficult to efficiently separate and enrich from a complex sample are solved, the limitation of insufficient SERS activity of a pure COF material is broken through, and a novel sensing platform with high sensitivity and excellent selectivity is provided for marine toxin detection.

The invention relates to a preparation method of a cone die forging, and belongs to the technical field of cone forging.The method comprises the steps that design software is utilized, single cone digifax is designed according to a cone part, then the two single cone digifax are placed side by side in the design software, and the central axes of the two single cone digifax are parallel; the end face of the cone top end of one cone is flush with the end face of the cone bottom end of the other cone; a wagons digital model is designed between the two single-cone digital models, and the wagons digital model and the two single-cone digital models form a double-cone digital model; designing a die digital model and a cube-shaped blank digital model according to the bipyramid digital model; a blank entity corresponding to the blank digital model is manufactured through blank manufacturing of a bar, an upper die entity and a lower die entity are manufactured through mechanical manufacturing, and the upper die entity and the lower die entity form a die entity; performing die forging on the blank entity by utilizing the die entity to obtain a bipyramid die forging; and the bipyramid die forging is subjected to heat treatment, and the bipyramid die forging subjected to heat treatment is cut into two single-pyramid die forgings.

The invention discloses a primer for selectively detecting bacillus and a preparation method of the primer. The primer comprises noble metal nanoparticles of a bipyramid structure and a metal organic framework doped with lanthanide metal ions, and the metal organic framework doped with lanthanide metal ions grows in situ in a bipyramid tip area of the noble metal nanoparticles. According to the primer for selectively detecting the bacillus, disclosed by the invention, a marker picolinic acid of the bacillus can be selectively adsorbed in a complex sample, so that interference of environmental factors on detection is effectively avoided, and the detection accuracy of an SERS spectrum on the bacillus in a complex environment is greatly improved; besides, when the primer selectively adsorbs the marker picolinic acid, the Raman signal of the picolinic acid can be effectively enhanced by the electromagnetic fields generated by the two tips of the bipyramidal noble metal nanoparticles, so that the ultra-sensitive detection of the marker is realized.

The invention relates to a bipyramidal climbing experiment teaching aid, in particular to an experiment demonstration device for teaching and a use method thereof.The experiment demonstration device comprises a demonstration platform, at least two demonstration devices are symmetrically arranged on the demonstration platform, each demonstration device comprises two universal joints and two guide frames, each universal joint comprises a fixing column, one end of each fixing column is arranged on the demonstration platform, and the other end of each fixing column is arranged on the guide frame. Movable shafts are arranged at the other ends of the cross shafts respectively. The two ends of each adjusting rod are connected with the corresponding universal joint and the corresponding guide frame respectively, so that the two adjusting rods can conduct angle adjustment independently, when the first connecting and disconnecting structure and the second connecting and disconnecting structure are connected, the two adjusting rods can conduct synchronous angle adjustment, and when students explore the influence of the track dip angle on the climbing speed / critical condition, the students can conduct synchronous angle adjustment. Different inclination angles can be accurately and repeatedly set, and the exploration boundary is expanded.

The application discloses a preparation method and application of gold nanometer bipyramid@ZIF-8 wrapped curcumin co-loaded nano-preparation, and comprises the following steps: S1, gold nanometer bipyramid is prepared and photoresponsive ligand modification is carried out; S2, the gold nanometer bipyramid is dispersed in a reaction system containing zinc salt, polyvalent metal salt, organic imidazole ligand, curcumin and defect inducer to form a mixed system; S3, double-wavelength near-infrared light irradiation is applied to induce in-situ growth of ZIF-8 layer doped with polyvalent metal ions on the surface, and a multi-level defect structure is formed; S4, a second active substance is loaded; S5, a biological enzyme responsive linker or an active targeting ligand is modified; and S6, a biological source polymer material is coated. Through synergistic regulation of photoinduced in-situ growth and defect engineering, the application realizes controllable growth and multi-level defect construction of the ZIF-8 layer, and the prepared nano-preparation is uniform in structure, closely combined in interface, stable in double active substance loading, excellent in enzyme-like catalytic activity, and can be used for preparation of tumor treatment drugs.

The invention discloses a preparation method of gold nano bipyramid surface localized coated silicon dioxide based on an iodide sub-monolayer mask. The method comprises the following steps: firstly, obtaining a high-purity gold nano bipyramid through seed growth and an AgNO3-Ag selective etching process; then, NaI is introduced into the degassed CTAC solution, so that a sub-monolayer adsorption mask is formed on the gold surface, and gradient centrifugal purification is performed; and finally, in a weakly alkaline CTAB system, the mask-modified gold nano bipyramid reacts with a TEOS-ethanol solution, so that silicon dioxide is precisely deposited only in the end part and waist region which are not covered by the mask. According to the method, the atomic-scale iodide sub-monolayer mask technology and the efficient purification process are combined, precise positioning and plaque homogenization of the silicon dioxide coating area are achieved, and compared with a traditional preparation path, the structural purity, the controllability of the coating area and the experimental repeatability are remarkably improved.

To provide a novel metal oxide.SOLUTION: A metal oxide has a crystal. The crystal has a structure in which a first layer, a second layer, and a third layer are stacked. The first layer, the second layer, and the third layer are substantially parallel to a formation surface of the metal oxide. The first layer has a first metal and oxygen. The second layer has a second metal and oxygen. The third layer has a third metal and oxygen. The first layer has an octahedron structure. The second layer has a trigonal bipyramid structure or a tetrahedron structure. The third layer has a trigonal bipyramid structure or a tetrahedron structure. The octahedron structure of the first layer has an atom of the first metal at a center. The trigonal bipyramid structure or the tetrahedron structure of the second layer has an atom of the second metal at a center. The trigonal bipyramid structure or the tetrahedron structure of the third layer has an atom of the third metal at a center. A valence of the first metal is the same as that of the second metal. The valence of the first metal is different from that of the third metal.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of water-based paint production, in particular to water-based paint raw material mixing equipment. Comprising a mixing box, a stirring mechanism, a bipyramid and a scraping rod, a connecting ring is arranged on the periphery of the mixing box, a support is arranged at the bottom end of the mixing box, a supporting ring is arranged on the support, and a plurality of first elastic assemblies are connected between the supporting ring and the connecting ring; the stirring mechanism comprises a rotating pipe rotationally mounted on the mixing box, a power assembly for driving the rotating pipe to rotate and a plurality of stirring blades mounted on the rotating pipe; the scraping rod is arranged on the inner side of the mixing box, a second elastic assembly is connected between the scraping rod and the rotating pipe, and a cross rod is connected to the scraping rod; the bipyramid is arranged in the center of the inner side of the mixing box. According to the utility model, after the material is discharged, the arranged scraping rod can be automatically adjusted to be in contact with the inner wall of the mixing box according to the change of the weight of the material in the mixing box, so that the residual material on the inner wall of the mixing box can be scraped.

The invention relates to the technical field of optical fiber sensing, in particular to an underground three-component optical fiber magnetic field sensor based on a micro-nano optical fiber and a system thereof. The fiber magnetic field sensor is constructed by wrapping the symmetrical biconical micro-nano fiber with a giant magnetostrictive rod. When the size of an underground magnetic field is changed, the internal molecular structure of the giant magnetostrictive rod is changed, so that the external structure is subjected to extension or contraction deformation, and meanwhile, the symmetrical biconical micro-nano optical fiber wrapped by the giant magnetostrictive rod is caused to generate basically identical extension or contraction; the broadband light source and the spectrograph which are connected to the two ends of the symmetrical biconical micro-nano optical fiber can detect the strain which is generated on the symmetrical biconical micro-nano optical fiber and is basically the same as the deformation of the giant magnetostrictive rod. By measuring the strain generated by the symmetrical biconical micro-nano optical fiber, the variable quantity of the external magnetic field can be calculated. An underground, land, aviation and seabed three-component magnetic field data acquisition system can be conveniently constructed by using the optical fiber magnetic field sensor.