85 results about "Mesocrystal" patented technology

The invention discloses novel Prussian blue mesocrystals and a preparation method thereof, and belongs to the technical field of the preparation of inorganic materials. The Prussian blue mesocrystals with novel hierarchical self-assembly structures are prepared by mixing ferrocyanide salt serving as a raw material with inorganic acid at a specific concentration through hydro-thermal treatment. The prepared integral mesomorphous particles are in shapes of scobinate octahedrons, similar octahedrons, similar spheroids and great lake rocks and consist of numerous small-scale crystals, and all the small-scale crystals are nanorods and nanocubes of between 150 and 250 nm. The Prussian blue mesocrystals can be applied in the field of catalysis due to larger specific surface areas and a mass of pore spaces; and the invention has the advantages of novel morphology of product particles, low cost, simple equipment, easy operation and the like.

The invention discloses a photoelectric chemical detection method of zearalenone based on a TiO2 mesocrystal. According to the method, a polydopamine-sensitized rutile type TiO2 mesocrystal is used as a photoelectric active substrate material and is applied to an immobilization zearalenone antibody; a mesoporous cobaltosic oxide marked zearalenone secondary antibody is used as a signal probe; a photoelectric chemical sensor based on a sandwich immune recognition mode is prepared by using a signal amplification effect of the probe on the substrate material and is applied to quantitative detection of zearalenone; based on stability and high conductivity of polydopamine, polydopamine and an RTM composite can accelerate transferring speed of photoinduced electrons and increasing photocurrent signals; through a sandwich immune recognition process, OMCO with competitive light-harvesting capability is introduced into a sensing interface; and high-sensitivity detection on zearalenone in a concentration range of 1x10<-6>ng / Ml-20ng / mL can be achieved.

The invention discloses a method for in-situ synthesis of compound of rutile TiO2 mesocrystal and graphene. A simple hydrothermal method is adopted to carry out in-situ synthesis on the compound of the rutile TiO2 mesocrystal and the graphene, and the compound of the rutile TiO2 mesocrystal and the grapheme is used for assembling lithium ion batteries. The method for the in-situ synthesis of the compound of the rutile TiO2 mesocrystal and the grapheme is simple in preparation, cost is low, energy consumption is low, repeatability is good, and the manufactured lithium ion batteries have high specific capacity and long-range cycling stability, show excellent multiplying power charge-discharge properties, and have wide commercial prospects.

The invention discloses preparation and application of an alpha-fetoprotein photoelectrochemical competitive immunosensor based on a double-sensitized structure. A sensing interface is constructed byusing titanium dioxide mesocrystals as a probe substrate and immobilizing an alpha-fetoprotein antibody (Ab), and using bismuth sulfide as an electrode substrate and immobilizing an alpha-fetoproteinantigen; the sensor with the double-sensitized structure is constructed by means of specific binding between an antigen and the antibody. An electrode modified with the alpha-fetoprotein antigen is placed in a mixed solution containing different concentrations of free antigen and a certain amount of labeled probes, and the free target antigen competes with the immobilized antigen for bonding to the labeled probes. Under the illumination condition, the electrode bonded with the probes can generate photocurrent with certain intensity, and the amplification of a current signal is realized by means of the double-sensitized structure. Furthermore, as the concentration of the free target material increases, the number of the probes bonded to the immobilized antigen decreases, and the photocurrent intensity is also reduced. Based on the phenomenon, a photoelectric analysis method for alpha-fetoprotein can be established.

The invention discloses a silicon phthalocyanine functionalized TiO2 mesocrystal based aflatoxin photoelectrochemical detection method. The method is characterized in that a novel carbon nanocomposite formed by carbon nanohorns and carbon quantum dots serves as a sensor support; dendritic phthalocyanine functionalized quasi-octahedral TiO2 mesocrystal is introduced as a bioprobe to realize high-sensitivity detection of aflatoxin. The novel carbon nanocomposite formed by CNHs and CQDs has an excellent photoelectric property; SiPcs functionalized QOTM is superior in photocurrent response and stability as compared with single QOTM. An immunosensor enables mutual competition between standard AFB1 and marked AFB1 in an AFB1 antibody specificity combination process, and target object concentration and photocurrent intensity are in linear relation in a range of 10<-6>-10<2>ng / ml. The method which is universal is provided for ultra-sensitive detection of micromolecular substances.

The invention discloses a coating and modification method for a prussian blue nanometer mesocrystal cytomembrane. The method comprises the steps that biological membrane and prussian blue nanometer mesocrystal are coated with ultrasonic waves at the pH of 7.4-8.0, and then the prussian blue nanometer mesocrystal coated with the biological membrane is obtained through centrifugalization, wherein the ultrasonic power is 150-300 w, and the ultrasonic frequency is 20-40 kHz. In the coating and modification method, the biological membrane and the prussian blue nanometer mesocrystal are coated efficiently by the coating and modification method with ultrasonic waves at the pH. Moreover, according to the method, the hydrophobic treatment or other pretreatments of the prussian blue nanometer mesocrystal are not needed, the operation is simple, the coating effects are good, and after the prussian blue nanometer mesocrystal is coated and modified, the effects of the prussian blue in the body are improved greatly.

This invention relates to a method for rapidly preparing calcium tungstate mesorystals. The method adopts microemulsions as the media, and can obtain the product with a very short reaction time. The method comprises: adding n-octane, n-butanol and cetyl trimethyl ammonium bromide into the same amount and concentration of calcium salt aqueous solution and sodium tungstate aqueous solution, respectively, to obtain two transparent microemulsions, rapidly mixing the two microemulsions within a certain temperature range, stirring for 10 min, and terminating the reaction to obtain calcium tungstate mesocrystals. The method has such advantages as simple process, low cost and rapid reaction. The size distribution of the obtained calcium tungstate mesocrystals is uniform.

The invention discloses a high-strength anti-corrosive steel product. The high-strength anti-corrosive steel product comprises the following components in percentages by weight: less than 0.02% of carbon, less than 0.5% of silicon, 0.4-0.6% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.01% of sulfur, 9.5-10.5% of chromium, 0.35-0.5% of nickel, 0.2-0.35% of molybdenum, less than or equal to 0.65% of copper, less than or equal to 0.007% of aluminum, less than or equal to 0.15% of titanium, less than or equal to 0.04% of vanadium, less than or equal to 0.12% of niobium, less than or equal to 0.02% of zinc, less than or equal to 0.07% of tungsten, less than or equal to 0.03% of cobalt, less than or equal to 0.04% of tin, less than or equal to 0.02% of lead and the balance of ferrum. The high-strength anti-corrosive steel product disclosed by the invention has the beneficial effects that the content of carbon and sulfur is reduced, the steel tissues are refined, and the molecular structural density of the steel is improved to achieve corrosion resistance and mechanical property; as the tissues of the steel are full, the diffusing speed of steel atoms is increased, chromium in the crystals and in the crystal boundary in a metallographic structure is easy to balance, thereby playing a role of preventing crystal boundary corrosion. Meanwhile, spot corrosion is replaced by uniform tiny corrosion on an integral plane, so that the corrosion rate is delayed; alloys such as molybdenum, nickel and copper alloys are added to form an intermetallic compound, so that the matrix structure is strengthened; crystalline grains can be refined by adding niobium, vanadium and titanium, so that the toughness of a material is further improved.

The invention relates to a copper-based composite metal oxide mesocrystal microsphere as well as a preparation method and application thereof. The copper-based composite metal oxide mesocrystal microsphere has a hollow core-shell structure, and sequentially comprises an inner core, a gap and an outer shell from inside to outside. The inner core and the outer shell are both composed of nano particles with consistent orientation, the nano particles comprise copper oxide nano particles and oxide nano particles of metal M, and the metal M comprises any one or a combination of at least two of Ge, Sn, Pb, In or transition metal elements. The copper-based composite metal oxide mesocrystal microsphere is synthesized by adopting a solvothermal method, conditions are mild, a surfactant and a template agent are not used, and the copper-based composite metal oxide mesocrystal microsphere is low in cost and environmentally friendly. When the copper-based composite metal oxide mesocrystal microsphere is used as a catalyst for a synthesis reaction of trichlorosilane serving as a solar crystalline silicon raw material, compared with a traditional non-catalytic industrial production process, the selectivity of trichlorosilane can be remarkably improved and reaches 98.0 percent.

The invention discloses hollow spherical rutile titanium dioxide mesocrystal which is of a hollow spherical structure assembled through rutile crystal nanorods, wherein the diameter of a hollow sphere is 3.0 to 6.0 microns, the length of every nanorod is 200 to 500 nanometers, and the width of every nanorod is 100 to 250 nanometers. A preparation method of the hollow spherical rutile titanium dioxide mesocrystal comprises the step of dissolving titanium potassium oxalate into the hydrogen peroxide reaction liquid for 48 to 72 hours of heat preservation under 80 DEG C, wherein nitric acid is added into the hydrogen peroxide reaction liquid. According to the hollow spherical rutile titanium dioxide mesocrystal and the preparation method thereof, the high temperature and high pressure hydrothermal environment is not required, the hollow spherical rutile titanium dioxide mesocrystal is obtained after the low temperature, the preparation route is simple and easy, the cost is low, the powder production rate is high, and the hollow spherical rutile titanium dioxide mesocrystal and the preparation method can be applied to the fields of light catalysis, lithium ion batteries and the like.

The invention discloses preparation of a zearalenone non-toxic electrochemical luminescence sensor based on a peptide sensor. The sensor takes TiO2 mesocrystal (ps-TiO2 MC) and chitosan (CS) synthesized through assistance of polyvinylpyrrolidone as a sensing platform, and takes a mercaptoethylamine functionalized ferronickel nano tube as a stand, and the large specific surface area of the ferronickel nano tube can provide more absorption sites for a luminescence agent ruthenium tris(bipyridine) (Ru(bpy)32+), and can fix a large amount of peptide with the effects of simulating zearalenone. Based in the advantages, the non-toxic competitive type electrogenerated chemiluminescence immunosensor is constructed, high-sensitivity detection of zearalenone is achieved, the sensor has the advantagesthat the sensitivity is high and the stability is good, and the sensor has the important application value and practical meaning at the aspect of clinical application.

The invention relates to the technical field of zeolite preparation, and discloses a method for preparing magnetic ZSM-5 zeolite from clay and red mud through a micro-solvent process. The method comprises the following steps: mixing acidified clay, red mud, chloride and tetrapropylammonium bromide, grinding the formed mixture into powder, adding a NaOH solution into the powder, and carrying out stirring to form a paste mixture; sealing the paste mixture, carrying out standing, and transferring the paste mixture into a sealed reaction kettle for crystallization to obtain ZSM-5 zeolite crystals;washing, drying and calcining the ZSM-5 zeolite crystals to remove a template agent; and carrying out heating to 600-700 DEG C, introducing nitrogen for 1 hour, then introducing hydrogen for 1-2 hours, and reducing the red mud iron-containing oxide to obtain the strong magnetic ZSM-5 zeolite. According to the method, the natural clay and the solid waste red mud are used as raw materials, chlorideis used as a mineralizing agent, sodium hydroxide is used as an alkalinity regulator, and the strong magnetic ZSM-5 zeolite is prepared by using the micro-solvent process, so the use of a large amount of solvents and ferric salts is avoided, subsequent treatment procedures are reduced, and the method is economic and environment-friendly.

The invention discloses a label-free zearalenone photoelectrochemistry detection method and sensor based on a TiO2 mesocrystal. The method utilizes a gold cone (Au cone) and a polythionine (PTH) sensitized rutile TiO2 mesocrystal (RTM) as an photoelectric active substrate material used for immobilization of a zearalenone antibody (Ab); based on the surface plasmon effect of the gold cone and stability and excellent electrical conductivity of polythionine, and a composite material of the gold cone and polythionine with the RTM can accelerate the transfer speed of photogenerated electrons and increase photocurrent signals, and when the zearalenone, namely an antigen (Ag), undergoes an immune reaction with the immobilized zearalenone antibody (Ab), due to the steric-hinerance effect, the photoelectric signals are significantly weakened. Based on the phenomenon, the established method can detect the zearalenone with the concentration in the range of 1*10<-6> ng / mL to 10 ng / mL with high sensitivity.

The invention discloses a signal-enhanced polymer functionalized rutile phase titanium dioxide mesocrystal based zearalenone detection method. Diphenylalanine (FF) can self-assemble to form dipeptide;the FF can be recombined with mesoporous silica (MPS) to form mesoporous silica nanospheres which is used for the construction of a sensing platform with a dipeptide compound; and a basal immobilizedantibody can be obtained through the covalent binding between the dipeptide and an antibody. A cysteamine-sensitized rutile phase titanium dioxide mesoscopic crystal (rTiO2 MCs) can significantly enhance photoelectrochemical response; Envision polymer containing a large number of antibodies can be recombined with the rTiO2 MCs to form an Envision@ rTiO2 MCs compound as a second antibody, and zearalenone (ZEN) can be identified through sandwich immunoreaction; and polymer functionalized rutile titanium dioxide mesocrystal can be taken as a photoelectrochemical probe, and a photoelectric signalcan be continuously enhanced with the continuous rising of zearalenone concentrations. Thus, high sensitivity detection on the zearalenone whose concentration is in a range of 10<-7>-10 ng / mL can berealized.

Various metal oxide mesocrystals can be synthesized in a simple manner by a method for producing a metal oxide mesocrystal, the method comprising the step of annealing an aqueous precursor solution comprising one or more metal oxide precursors, an ammonium salt, a surfactant, and water at 300 to 600° C. Composite mesocrystals consisting of a plurality of metal oxides or an alloy oxide can also be provided.

The invention belongs to the technical field of lithium-ion battery materials and particularly relates to a preparation method of nitrogen-doped hollow carbon spheres. The nitrogen-doped hollow carbonspheres are obtained by regarding carbon-coated titanium dioxide mesocrystal as a template, graphitizing a carbon layer at a high temperature and further dissolving the titanium dioxide at the interior by virtue of hydrofluoric acids. The preparation technology is simple and the prepared nitrogen-doped hollow carbon spheres have good cycling stability and rate capability.

The invention provides a method for improving a crystal edge defect in a photoresist coating process. The method comprises the steps of carrying out photoresist coating at a coating rotating speed and forming a photoresist coating with a preset thickness on the upper surface of a to-be-treated wafer; carrying out multi-stage main rotating speed treatment on the photoresist coating, wherein the multi-stage main rotating speed treatment comprises first rotating speed treatment and second rotating speed treatment of which the rotating speed is less than a first rotating speed; and keeping the photoresist coating moist, wherein the second rotating speed treatment comprises washing treatment on the edge of the wafer at the first stage before membrane stabilization to moisten the edge of the wafer and to remove the part, overflowing to the edge of the wafer, of the photoresist coating after coating, and a membrane thickness stabilization treatment at a second stage: washing treatment on the edge of the wafer after membrane stabilization to remove the part, diffusing to the edge of the wafer, of the photoresist coating and spin drying. According to the method, through improvement of the technological processes of treatment and cleaning nozzle equipment, the photoresist on the edge of the wafer in the photoresist coating process can be effectively removed and the product yield is increased by 1-2%.

The invention discloses a preparation method of a crystal form of a gefitinib Form 1. The preparation method comprises the following steps: dissolving a crude gefitinib product in a single or mixed solvent through heating; keeping temperature till the crude gefitinib product is completely dissolved, and then adding water to a liquid; reducing the temperature; crystallizing; and carrying out post-processing to obtain the crystal form of the gefitinib Form 1. The preparation method disclosed by the invention prevents the problems of uncontrollable crystal form, complicated step and high cost in the preparation process of the crystal form of the gefitinib Form 1, enhances the operation controllability and stability, reduces the cost and is suitable for industrialized production; and the prepared crystal form of the gefitinib Form 1 can achieve high yield more than 90%, the chromatographic purity more than 99.8% basically and the maximal individual impurity less than 0.1% and meet the requirement on product quality.

The invention discloses a visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation and application thereof. The visible light response cobalt-doped anatase TiO2 mesocrystal is formed by doping cobalt into anatase TiO2 mesocrystal, and the mesocrystal is shaped like a uniform ingot and has the length of 80 to 120 nm and the width of 25 to 40 nm. The visible light response cobalt-doped anatase TiO2 mesocrystal is prepared by the following steps: mixing and stirring a butyl titanate precursor and tetraethyl orthosilicate; adding sodium acetate trihydrate and cobaltous acetate tetrahydrate into acetic acid, stirring and dissolving; mixing the two mixtures; transferring to a reaction kettle; after reaction is finished, washing and drying. According to the invention, large-scale synthesis of the anatase TiO2 mesocrystal is realized; the cobalt is doped into the anatase TiO2 mesocrystalthe light response range of the anatase TiO2 mesocrystal is widened to a visible light region; and the utilization ratio of visible light is increased. The method is simple and convenient to operate and short in period; the mesocrystal has uniform appearance, high dispersibility and high purity. The mesocrystal serves as a photocatalyst for degrading pollutants through photocatalysis, and the result shows that the mesocrystal has excellent visible light degradation activity and has a good application value in the environmental protection fields of waste water treatment and the like.

The invention discloses a crystal bar cutoff method of a multi-stage semiconductor crystal bar cutoff machine. The crystal bar cutoff method comprises the steps that S1, a feeding device is used for transferring a semiconductor crystal bar to be cut onto a feeding platform of a material conveying device, and the feeding platform feeds the semiconductor crystal bar to a cutting platform and enablesthe semiconductor crystal bar to fall onto the cutting platform; S2, an aligning device adjusts the level condition of the center axis of the semiconductor crystal bar on the cutting platform; S3, the semiconductor crystal bar is subjected to cutting and sampling operation in cutoff positions in multiple cutting modes; and S4, cutoff crystal bar sections are fed into a discharging platform from the cutting platform in sequence and finally discharged from the discharging platform into a transfer device. Through cooperation of the above method and the multi-stage semiconductor crystal bar cutoff machine, the problems that the cutting functionality is single in the crystal bar section cutoff process, the perpendicularity of the cutoff end face to the center axis of crystal bar sections is poor, the sampling efficiency is low and the crystal bar sections are damaged easily in the conveying process in the prior art are effectively solved.

Various metal oxide mesocrystals can be synthesized in a simple manner by a method for producing a metal oxide mesocrystal, the method comprising the step of annealing an aqueous precursor solution comprising one or more metal oxide precursors, an ammonium salt, a surfactant, and water at 300 to 600° C. Composite mesocrystals consisting of a plurality of metal oxides or an alloy oxide can also be provided.

The invention relates to a controllable preparation method of high-performance one-dimensional BaTiO3 / SrTiO3 nano composite mesocrystals. According to the method, tetratitanic acid is used as a template, alkaline earth metal oxide and hydroxide are used as raw materials, and the BaTiO3 / SrTiO3 nano composite mesocrystals with different ratios can be prepared under control by adopting a two-step hydrothermal method. A preparation process has high controllability, and nanocomposites with different ratios can be prepared according to application requirements. BaTiO3 / SrTiO3 prepared by the method is a one-dimensional nanocomposite mesocrystal, has a regular rod shape, and has the maximum piezoelectric property 253 times higher than that of one-dimensional BaTiO3 monomers. In addition, the template and the reactants used in the preparation process and the waste liquid generated by a prepared product do not harm the environment and the human bodies, and can be applied to the aspects of layercapacitors, thermistors, photoelectric equipment, electromechanical equipment, sensors, dynamic random access memories, field effect transistors, other miniature devices and the like.

This invention relates to a method for manufacturing new type bone porcelain. The bone porcelain is composed of: SiO2 50-60 wt.%, Al2O3 20-30 wt.%, P2O5 1.8-3.5 wt.%, CaO 2-5 wt.%, MgO 0.2-0.5 wt.%, K2O and Na2O 3-5 wt.%. The crystal phase content is 50-70 wt. % in the porcelain body. The main crystal phase is mullite, and the minor crystal phases are beta-Ca3 (PO4)2 and anorthite. The bone porcelain is manufactured from: bone ashes 5-10 wt.%, Al powder 5-10 wt.%, kaolin 25-35 wt.%, and porcelain stone 45-60 wt.%. The bone porcelain has such advantages as good appearance, thin external wall, light weight, good light transmittance and good thermal stability. The title method has such advantages as low bon ashes addition, wide sintering range, high quality goods rate, low manufacturing cost and wide raw material resources, and is suitable for mass production.

The invention discloses a tetraaryl-substituted bis-phenanthrene-fused compound based on dithienothiophene containing a plurality of alkoxy chains and a synthesis method of the compound, and the compound has the structures shown in general formulas (I) and (II). A polycyclic-fused compound of the bis-phenanthrene-fused dithienothiophene in the general formula (II) can be obtained by intramolecularoxidation ring-closing of FeCl3 of a tetraaryl-substituted dithienothiophene compound in the general formula (I). The tetraaryl-substituted dithienothiophene compound in the general formula (I) has blue fluorescence emission and certain liquid crystal properties. Due to the further expansion of the central conjugated coplanar, the bis-phenanthrene-fused dithienothiophene compound in the general formula (II) can be self-assembled into a stable liquid crystal interphase in a highly ordered manner and is a good mesocrystal. The compound can further be used as an OLED blue luminescent material with higher optical quantum yield, an excellent P-type semiconductor material with high hole transport rate and a gel of multiple polar / non-polar organic solvents.

The invention discloses a disc-shaped liquid crystal compound containing a fluorene luminescent group. Researches show that the compounds are simple and convenient in synthesis, and are mainly obtained by Suzuki coupling and then ring closure reactions. Some monobrominated biphenyls are used as raw materials and can be subjected to Suzuki coupling with borate; therefore, the required disc-shaped liquid crystal compound containing the fluorene luminescent group is synthesized through simple substitution, coupling and ring closing reactions. The synthetic route of the compound is short. Fluoreneis used as a good light-emitting element, and the compound combines a liquid crystal element and a light-emitting element, so that the disc-shaped liquid crystal compound containing the fluorene light-emitting group and having the liquid crystal property and the light-emitting property is synthesized. According to the invention, a stable hexagonal columnar phase and a nematic phase can be formedin a very wide temperature range. The compound is a good mesocrystal, has a good luminescence property, and can be used as a luminescent material with a quantum yield of about 75%.

The invention discloses a method for preparing [100] oriented textured barium titanate piezoelectric ceramics. The method comprises the following steps: taking two-dimensional barium titanate mesocrystals and barium titanate powder as raw materials, preparing slurry into a membrane by adopting a tape casting method, and performing heat treatment after the membrane is prepared into a green body, thereby obtaining the [100] oriented textured barium titanate piezoelectric ceramics. According to the method, the barium titanate piezoelectric ceramics are prepared by utilizing anisotropism of piezoelectric materials and topological mesoscopic transformation of the mesocrystals; in the method, the flake barium titanate mesocrystal with large diameter height ratio and excellent orientation servesas a reaction template, the random growth property of the traditional barium titanate particles can be overcome, and the prepared [100] oriented textured barium titanate piezoelectric ceramic materialis capable of greatly improving the piezoelectric property of the barium titanate ceramics; the prepared barium titanate piezoelectric ceramic is small in particles and high in density, has an orientation degree of 28-80.6% in the [100] direction, reaches a piezoelectric constant of 154-322pC / N and can be widely applied to a piezoelectric sensor, a multi-layer capacitor or a memory.

The invention discloses tin doped ferric oxide mesocrystal nano particles. The tin doped ferric oxide mesocrystal nano particles are formed by doping tin in ferric oxide mesocrystal nano particles formed through orientation stacking of ferric oxide nano particle crystals of 2 nm to 6 nm, the size of the tin doped ferric oxide mesocrystal nano particles ranges from 40 nm to 220 nm, and the specific surface area of the tin doped ferric oxide mesocrystal nano particles is 36.2 m<2> / g, wherein the molar weight of doped tin accounts for 0.01%-15% that of iron. A preparation method of the tin doped ferric oxide mesocrystal nano particles comprises the steps that 1, the ferric oxide mesocrystal nano particles are synthesized; 2, a proper quantity of ferric oxide mesocrystal nano particles and a tin source alcoholic solution in a corresponding proportion are mixed, stirring and volatilizing are carried out, and vacuum drying is carried out after volatilizing is completed; 3, the dried composite is placed in a muffle furnace to be calcined for 3 hours or longer at the temperature of 500 DEG C to 650 DEG C. The obtained tin doped ferric oxide mesocrystal nano particles have enhanced pollutant visible light catalytic degradation and photoelectrochemical water decomposition performance and can be commercially applied in the fields of pollutant photocatalytic degradation, photocatalytic water splitting hydrogen production, supercapacitors, lithium ion batteries and the like.

The invention relates to crystal oscillators machining and production equipment, in particular to an automatic directed placing device for cylindrical crystal oscillators. The automatic directed placing device for the cylindrical crystal oscillators comprises a rack. A feeding device and a crystal oscillator placing workbench are arranged on the rack. A manipulator device is arranged between the feeding device and the crystal oscillator placing workbench and slides along a Y-axis track on the upper portion of the rack. The automatic directed placing device for the cylindrical crystal oscillators can automatically feed the cylindrical crystal oscillators, the cylindrical crystal oscillators can be fed in a unified and constant posture in the feeding process, and subsequent procedures are conducted conveniently.

The invention discloses a double signal amplified zearalenone impedance sensor based on nano-Co3O4 mimic enzyme catalysis action. Hyaluronic acid functionalized TiO2 mesocrystal serves as a sensing platform, a lot of first antibodies (Ab1) are captured by hyaluronic acid, zearalenone antigens and second antibodies (Ab2) marked by Co3O4 are sequentially identified on a sensing interface, electron transfer is impeded by generated immune complexes, and electrochemical impedance signals are amplified. Nano-Co3O4 serves as an inorganic metal oxide, has good properties of peroxide mimic enzyme and is better in stability and high in catalytic activity, a lot of organisms are generated through catalytic oxidation and deposit on the surface of testing electrodes, and detecting signals are further amplified. An impedance sensor with high sensitivity, good stability and low detection limit is built, and the zearalenone is ultra-sensitively detected.

The invention discloses CeO2 mesocrystals as well as a preparation method and application thereof, and belongs to the field of preparation of metallic oxide functional materials. The preparation method comprises the following steps: dissolving ceric ammonium nitrate, ammonium nitrate and soluble sulfate into water according to a ratio to form a mixed solution, and enabling hydrothermal reaction at 150 to 200 DEG C for 5 to 72 hours to prepare the CeO2 mesocrystals. The preparation method is simple, feasible and low in cost; no organic additives are added, so that the preparation method goes green and is environmentally friendly. The prepared CeO2 mesocrystals are high in monodispersity and spherical and are internally provided with a plurality of pores; the CeO2 mesocrystals are high-quality water-gas shift catalyst vectors.