155 results about "Material chemistry" patented technology

The invention provides an ER targeting self-assembly AIE probe with cascade ROS / RNS generation performance, and belongs to the technical field of material chemistry, the probe is composed of four units: 1) an AIE photosensitizer OTBS used for generating ROS; 2) deriving peptide FFVLK from beta amyloid protein, and promoting the self-assembly of the peptide to form a nanofiber with a beta-sheet structure; (3) an oligomerization arginine unit RRRR which is used as an NO donor; and 4) ER targeting signal peptide KDEL to endow ER with targeting ability. Based on ER targeting and a self-assembly process, the self-assembly AIE probe is subjected to ER in-situ self-assembly in cells to form nanofibers, ROS / RNS is generated in a cascading manner under illumination, and strong ICD is induced. In addition, the tumor residence time of the photosensitizer is prolonged due to the formation of the nanofibers, and the treatment effect is further improved. The invention provides a new thought for the design of a novel light-operated II-type ICD inducer.

The invention discloses a red up-conversion luminescent material, which belongs to the field of inorganic luminescent materials, the chemical formula of the material is NaEr < 0.65 > F4: Yb < 0.2 > / Gd < 0.1 > / Tm < 0.05 >, and up-conversion microparticles of the red up-conversion luminescent material are used as a bifunctional luminescent temperature sensor which can be used for a 293348 K low-temperature region sensitization sensor and a 348498 K high-temperature region thermal quenching sensor. After near-infrared light with the wavelength of 980 nm excites Yb < 3 + > ions, through efficient energy transfer between Er < 3 + > and Tm < 3 + >, different changes of near-infrared response type 654 nm and 808 nm red up-conversion luminescence characteristics can be used for non-contact optical temperature measurement under the extreme temperature condition. Temperature detection is realized based on thermal coupling energy levels of 4F9 / 2 to 4I15 / 2 and 3H4 to 3H6, and the distance between two emission peaks is large, so that the data processing error is greatly reduced; excitation light and emission light are located in an optical window of the biological tissue, and absorption and self-fluorescence of the biological tissue are greatly reduced. The preparation method is based on the green chemistry concept, takes water as a solvent and adopts a one-step hydrothermal method for synthesis, the preparation method is simple, the required temperature is low, the preparation process is easy to control, the material crystal phase is good, the phase is uniform, the yield is high, the material performance is stable, and the good temperature response effect is achieved.

The invention provides an adhesive based on a lipoic acid compound and a nitrogen heterocyclic compound as well as a preparation method and application of the adhesive, and belongs to the field of material chemistry. The adhesive disclosed by the invention is prepared from a lipoic acid compound, a nitrogen heterocyclic compound and absolute ethyl alcohol, the azacyclo-compound is at least one of an azacyclo-naphthenic compound or an azacyclo-crown ether compound. The adhesive disclosed by the invention is simple in raw material composition and preparation method, and the obtained adhesive has the advantages of high bonding strength, excellent underwater bonding performance, wide applicable materials, high bonding speed, environment friendliness, recoverable raw materials and the like, and shows huge application potential.

The invention provides a long-time scale solid surface aging characteristic analysis method and system and electronic equipment, and relates to the technical field of insulation material aging. The method comprises the following steps: preparing a material sample; preparing a solid material sample with good anti-aging performance under a specific working condition according to a material chemical theory and experience; obtaining a solid surface appearance by a high-precision microscope; carrying out accelerated aging on the material at a constant temperature for a certain time; solid surface features including roughness and fractal indexes under different accelerated aging time are extracted, edge curvilinear equation fitting is carried out, and an aging feature curve is generated, so that an aging behavior prediction result is obtained, continuous monitoring and accurate analysis of the solid surface aging process are realized, and the aging behavior prediction accuracy is improved. Through continuous monitoring of the multi-time-node accelerated aging experiment, aging full-period coverage and multi-dimensional data fusion are realized, data accuracy and aging identification precision are improved, and aging behavior prediction precision is improved.

The invention relates to the field of online analysis of chemical components of materials, and discloses an online monitoring process for components of a lead frame electroplating solution, which comprises the following steps: conventionally monitoring the spectrum of the electroplating solution to calculate the concentration; calculating a spectral entropy index based on the deviation degree of the real-time spectrum and a pre-established statistical baseline model, and comparing the spectral entropy index with a preset failure trigger threshold; a dynamic calibration step is started only when the spectral entropy index exceeds the preset failure trigger threshold, the dynamic calibration step compares a physical true difference spectrum with a model virtual difference spectrum by injecting a standard pulse to generate a model error vector, and the model error vector is utilized to correct the chemometrics model, so that the stoichiometry accuracy is improved. According to the method, on-demand calibration is realized, and the consumption of the standard substance is reduced while the real-time accuracy of the model is guaranteed.

The invention provides an artificial intelligence grading classification-regression combination prediction method for multi-class materials, and belongs to the technical field of material informatics and artificial intelligence. According to the method, a historical sample data set of material chemical composition and crystal structure information is obtained, a band gap value is divided into a plurality of intervals based on an equal width principle, and interval labels are generated. Key features are extracted, an SVM classification model is trained to predict a band gap interval, and then a multi-layer neural network regression model is utilized to predict a band gap value. If the highest confidence coefficient is higher than the threshold value, directly calling the multi-layer neural network regression model of the corresponding interval; and if the value is lower than the threshold value, multi-interval parallel regression and weighted fusion prediction are carried out. According to the artificial intelligence grading classification-regression combination prediction method for the multi-class materials, the precision and robustness of band gap prediction can be effectively improved, particularly, the performance is prominent when high and low band gap samples are distributed imbalanced, and a precise and reliable solution is provided for material band gap prediction.

The invention provides an amphiphilic modified silane coupling agent as well as a preparation method and application thereof, and belongs to the field of material chemistry. The invention provides an amphiphilic modified silane coupling agent preparation method, which comprises: in the presence of an acid-binding agent and a first solvent, carrying out a reaction on a hydroxyl-containing hydrophilic polymer and halogenated acyl halide to obtain an ATRP initiator; in the presence of a metal salt catalyst, a ligand and a second solvent, reacting an ATRP initiator with an acrylate monomer to obtain an active macromolecule containing an amphiphilic group; in the presence of an alkali reagent and a third solvent, the active macromolecules containing the amphiphilic groups react with a silane compound containing amino groups, and the amphiphilic modified silane coupling agent is obtained. The silane coupling agent provided by the invention can be effectively applied to a coating, not only can improve the interface performance between an inorganic matter surface and an organic coating, but also can effectively improve the tensile strength, the waterproof and anti-fouling properties and the tensile strength after re-coating of a coating.

The invention relates to the field of material chemistry on-line detection, in particular to a 1, 2, 4-trichlorobenzene on-line detection material and a preparation method thereof, and provides a film-forming sensitive layer material capable of being coated on the surface of a transducer, and the film-forming sensitive layer material comprises chitosan, a crosslinking component with the content of 0.1-5wt% in terms of glutaraldehyde and magnetic core-shell molecularly imprinted particles after being dried, the magnetic core-shell molecularly imprinted particle contains a ferroferric oxide magnetic inner core, a silicon dioxide middle layer and a molecularly imprinted polymer shell layer, and the shell layer is a cyclodextrin methacrylate and ethylene glycol dimethacrylate copolymer network and takes 1, 2, 4-trichlorobenzene as a template. The material keeps the membrane integrity and long-term stability under the working conditions of circulation and regeneration and also gives consideration to quick response, and the residual 1, 2, 4-trichlorobenzene is controlled to be not greater than 0.10 wt% and the residual glutaraldehyde is controlled to be not greater than 0.5 wt%. The method is used for relieving structural mass transfer contradiction and processing and coating coupling contradiction caused by high filler load, and has online detection application value.

The invention discloses a wave-absorbing material chemical coprecipitation reaction kettle, and relates to the technical field of chemical engineering equipment and functional material preparation, the reaction kettle comprises the following components: a three-stage gradient reaction cavity structure, an anti-pollution structure and a multi-physics field coupling control platform; through the design of a three-stage gradient reaction cavity structure, optimal distribution of a fluid field is realized, stable and efficient flowing of a reaction solution among different cavities is ensured, a multi-axis intelligent mixing system in a premixing area can quickly mix a precursor solution to achieve a molecular-level mixing state, an ideal initial condition is provided for subsequent reaction, and the reaction efficiency is improved. The nucleation area realizes uniform nucleation of nanocrystal nuclei through accurate temperature control and chemical environment control, the grain size distribution range is effectively reduced, the growth area controls preferred growth of crystal faces through adjustment of magnetic field intensity and solution supersaturation degree, particles with good monodispersity are obtained, and under the combined action of the designs, the particle size distribution range is effectively reduced. The reaction efficiency and the consistency of the product quality are obviously improved.

The invention belongs to the technical field of material chemistry, and particularly relates to a method for synthesizing an amide hydrogen bond organic framework material based on a one-pot method and gold recovery application. The preparation method comprises the following steps: dissolving a dihydroxybenzidine monomer in a formic acid monomer under 15-minute ultrasonic treatment, then adding ethylene glycol, and then carrying out ultrasonic treatment on the mixture for 5 minutes; then placing the sample bottle in a drying oven at 30 DEG C for constant-temperature evaporation so as to separate out brown blocky crystals; and filtering and collecting crystals, washing with water for multiple times, and carrying out vacuum drying at 60 DEG C to obtain the final material HOF-D. The HOF-D synthesized by the method disclosed by the invention can be used for rapidly recovering Au (III) from an aqueous solution with high selectivity, cycling stability and large capacity (5186 + / -10 mg. G <-1 >), so that the efficient adsorption and recovery of Au (III) in electronic waste liquid are realized, and the HOF-D has a good application prospect.

The invention relates to the technical field of novel material chemical analysis, and discloses a triphenyl phosphate purity standard substance valuing method, which comprises the following steps: filtering, drying, dissolving and sterilizing a triphenyl phosphate sample; a triphenyl phosphate sample is comprehensively analyzed from different angles by comprehensively applying a GC-MS (Gas Chromatography-Mass Spectrometry) technology, an NMR (Nuclear Magnetic Resonance) technology, an infrared spectroscopy, a gas chromatography-flame ionization detector method, a Karl Fischer method and an inductively coupled plasma mass spectrometry, and finally, the purity value of the triphenyl phosphate purity standard substance is calculated by a mass balance method. The method provides a scientific and accurate technical means for quality control and standard formulation of the triphenyl phosphate product, has important practical application value for related industries in the fields of chemical engineering and material science, and is beneficial for improving the product quality and promoting industrial upgrading.

The invention relates to the technical field of computer-aided material design, in particular to a material chemical formula generation method based on performance sensitivity self-adaptive stratified sampling, which comprises the following steps: inputting an element list; querying a performance sensitivity knowledge base to obtain a sensitivity level and an adjustment factor; analyzing the composite elements, extracting multi-dimensional element features, and quantitatively calculating element combination complexity; based on the element number, the sensitivity and the complexity, a corresponding sampling strategy is adaptively selected, and the sampling amount is dynamically allocated; generating a chemical formula and de-weighting; and outputting a chemical formula list and full-process metadata. Through innovation of resource allocation driven by performance sensitivity, composite element atomic-scale analysis, feature space clustering and the like, on the premise that sampling representativeness and chemical rationality are guaranteed, the calculation efficiency is improved by dozens of times to hundreds of times, the response time is reduced to the second level or the minute level, and the method has the advantages of being traceable, extensible and high in universality and has wide application prospects. And the material screening and discovery process is effectively accelerated.

The invention relates to a method for predicting the separation performance of a mixed matrix membrane through machine learning, and belongs to the technical field of computational material chemistry. Due to the reasons of various filler types, complex membrane structures, indefinite mass transfer mechanisms and the like, the design and preparation of mixed matrix membranes (MMMs) are still in a trial and error stage. The invention discloses a high-throughput design and screening mixed matrix membrane based on machine learning acceleration. Through high-throughput giant regular Monte Carlo calculation and molecular dynamics simulation, the reliable structure and performance characteristics of the MOFs filler are calculated. The high-throughput calculation data and the experimental data of the polymer membrane are combined to construct a large data set. A machine learning regression model is trained to predict penetration and separation performance, and a potential structure-performance relationship of MMMs is disclosed.

The invention relates to the technical field of component detection, in particular to a material chemical component detection method and system based on the spectrum technology, and the method comprises the steps: obtaining a preset number of initial spectrum images of a to-be-detected material through a detector, screening out a matched standard scattering peak corresponding to each target scattering peak from scattering peaks of all standard components obtained in advance; determining a drift possible factor corresponding to each target scattering peak; determining a spectrum overlapping cause characterization coefficient; determining an equipment environment influence factor and a target compensation coefficient corresponding to each initial spectral image; and correcting the initial spectral image according to the target compensation coefficient, and detecting the chemical components of the material based on the corrected initial spectral image. According to the method, the correction of the initial spectral image is realized by analyzing the spectral overlapping condition of the initial spectral image, and the spectral overlapping degree in the spectral image is corrected to a certain extent, so that the detection accuracy of the chemical components of the material is improved.

The invention belongs to the technical field of material chemistry, and relates to nano barium sulfate and a preparation method thereof. The invention provides a preparation method of nano barium sulfate, which comprises the following steps: adding a barium acetate solution, sulfhydrylated chitosan and sodium stearate into a sodium sulfate solution for mixing reaction, collecting the obtained product after the reaction is ended, filtering, drying and grinding to obtain the nano barium sulfate, the concentration of the sodium sulfate solution is 1.4 to 2.6 mol / L, and the concentration of the barium acetate solution is 1.4 to 2.6 mol / L; 0.05 to 0.15 g of thiolated chitosan and 0.05 to 0.15 g of sodium stearate are correspondingly added into each 100 mL of the sodium sulfate solution. The invention solves the technical problems of high particle size and non-uniform particle size distribution of nano barium sulfate particles when the nano barium sulfate particles are prepared by adopting a direct precipitation method.

The invention discloses a preparation method of a pegylation acoustic catalysis effect black phosphorus loaded biological enzyme nano particle, which is a novel nano composite material based on material chemistry and pharmaceutical chemistry, and bacterial keratitis is treated by using the unique acoustic catalysis property of the nano particle. Nanoparticle synthesis mainly comprises the following steps: 1) pretreatment of commercial black phosphorus; (2) uploading biological enzyme iron-curcumin to black phosphorus in situ; and (3) synthesizing hyaluronic acid coupled phospholipid polyethylene glycol (DSPE-coated PEG2000-HA) and modifying the biological enzyme black phosphorus nanoparticles. The finally obtained nano composite material has good biocompatibility, ocular surface adhesion, biological enzyme activity and acoustic catalytic treatment effect on bacterial biofilm infection of eyes.

The invention discloses cerium oxide / piezoelectric material composite nano-enzyme for an antifouling coating as well as a preparation method and application of the cerium oxide / piezoelectric material composite nano-enzyme, and belongs to the technical field of material chemistry and marine protection. The preparation method of the composite nano-enzyme comprises the following steps: dispersing a metal cerium source and a piezoelectric material source in a solvent according to a mass ratio of 1: (1-5), carrying out phase formation and composite treatment, and collecting a solid product after treatment, thereby obtaining the composite nano-enzyme. The composite nano-enzyme can be used for marine antifouling paint to form a functional material system capable of realizing self-driven antifouling by directly utilizing mechanical energy such as ocean waves, vibration and the like. According to the system, mechanical energy is converted into electrochemical energy to drive in-situ generation of H2O2, and Ce < 3 + > / Ce < 4 + > redox cycle is utilized to efficiently convert H2O2 into ROS, so that sustainable antibacterial and anti-biological adhesion effects are achieved, toxic substances are not released, and the system belongs to an environment-friendly protection technology.

This invention discloses a method for directional experimental verification and performance testing guided by computational simulation in materials chemistry, belonging to the field of materials performance testing technology. The method includes: acquiring the structural parameters of semiconductor devices and initial parameters of interface defects; calculating the characteristic time constant of carrier trapping by interface traps; simulating and generating a theoretical capacitance-voltage hysteresis loop; then performing bidirectional voltage scan tests within a sensitive scan rate range; finally, updating the inversion parameters and resimulating, iteratively adjusting until the characteristic deviation between the theoretical loop and the measured data meets the convergence condition, thus outputting an interface state density distribution map. This invention, through computational simulation-guided directional experiments, achieves accurate capture and non-destructive in-situ characterization of the dynamic response characteristics of interface states, effectively establishing the dynamic structure-property relationship between microscopic interface defects and macroscopic device performance, and significantly improving the accuracy and reliability of interface defect parameter inversion.

This case involves a method for temperature-controlled supermolecular chirality of oligoaniline helical nanoribbons in a non-chiral molecule-mediated synthesis system. A mixed solvent of acetone and water is used as the mediating system. Aniline is dissolved in the mixed solvent to obtain a mixed solution. A certain amount of ammonium persulfate aqueous solution is then added, stirred and mixed evenly, and then placed at 0-27°C for a certain period of time. The precipitate that appears in the system is the oligoaniline helical nanoribbon. The present invention successfully achieves the synthesis of helical chiral nanoribbons by mediating the assembly of aniline monomers in a non-chiral acetone / water mixed solvent. The reaction process is simple and easy to operate, the raw materials are readily available, the prepared nanoribbons have obvious helical structures, strong chiral signals, and good environmental stability, and have good application prospects in materials chemistry, especially in chiral recognition and resolution and chiral crystallization. And through the construction method of the present invention, chirality reversal can be achieved simply by regulating the temperature.

The invention relates to a text mining method and system for identifying a material chemical formula. The method comprises the steps of firstly obtaining a text set and preprocessing to obtain a target text set; marking the positions of the chemical elements, correcting errors to obtain a mark vector, and obtaining a difference vector through exponential offset and difference processing; and then calculating the maximum rising subsequence length of the outlier sequence, setting the cluster number, performing k-means clustering on the offset vector, and finally marking the text according to the k-means clustering result. Compared with the prior art, the method has the advantages of high text chemical formula extraction accuracy, high efficiency and the like.

The invention provides a fluidized bed carbonyl method powder surface modification production device and a use method thereof, belongs to the technical field of powder metallurgy and atomic vapor deposition, and solves the problem of lack of a stable and efficient fluidized bed carbonyl method powder surface modification production device in the prior art. An electromagnetic heater is arranged on the fluidized bed reactor, a fluidized bed hood is arranged at the bottom of the fluidized bed reactor, the fluidized bed reactor is sequentially connected with a cyclone separator and a dust collector, the dust collector is connected with the fluidized bed reactor, the cyclone separator and the dust collector are respectively connected with a passivation bin, and the passivation bin is connected with multistage linear screening equipment. According to the method, a chemical fluidized bed technology and a material chemical vapor deposition preparation technology are combined, the characteristics of high purity, low thermal dissociation temperature and the like of a carbonyl metal intermediate compound are utilized, carbonyl nickel liquid is used as a raw material, and atomic vapor deposition coating of high-purity nickel metal atoms is carried out.

The invention provides a 1, 4-dihydrobenzosilacyclohexane compound containing a polyfunctional group structure as well as a preparation method and application thereof, the preparation method specifically comprises the following steps: in the presence of a phosphine ligand, a palladium catalyst and a reaction medium, carrying out silicon-carbon bond activation and cycloaddition reaction on phenylpropargyl aldehyde and benzosilacyclobutane to prepare the 1, 4-dihydrobenzosilacyclohexane compound containing the polyfunctional group structure, and carrying out cycloaddition reaction on the 1, 4-dihydrobenzosilacyclohexane compound containing the polyfunctional group structure to obtain the 1, 4-dihydrobenzosilacyclohexane compound containing the polyfunctional group structure. The 2, 4-dihydrobenzo-silacyclohexane compound disclosed by the invention is applied to both material chemistry and medicinal chemistry. According to the present invention, the reaction condition is mild, the operation is simple, the substrate universality is strong, the crude product is subjected to rapid column chromatography impurity removal and vacuum concentration to obtain the pure product, the post-treatment is convenient, the finally obtained chemical selection is high, and the silicon-containing cyclohexane structure precursor can be widely used in various organic reactions and drug synthesis, and has considerable potential application value.

The present application relates to the field of on-line analysis of material chemical composition, and discloses an on-line monitoring process for the composition of a lead frame electroplating solution, comprising: calculating the concentration of the electroplating solution by conventional monitoring of the spectrum; calculating a spectrum entropy index based on the degree of deviation of the real-time spectrum from a pre-established statistical baseline model, and comparing the spectrum entropy index with a pre-set failure trigger threshold; starting a dynamic calibration step only when the spectrum entropy index exceeds the pre-set failure trigger threshold, the dynamic calibration step generating a model error vector by comparing the physically real differential spectrum with the model virtual differential spectrum through injection of a standard pulse, and correcting the chemometrics model using the model error vector, so that the present application realizes on-demand calibration, ensures real-time accuracy of the model, and reduces the consumption of the standard.

The invention relates to a bio-based silane coupling agent as well as a preparation method and application thereof, and belongs to the technical field of organic material chemistry. The bio-based silane coupling agent is prepared from the following raw material components: a cardanol derivative, a mercapto silane coupling agent and a photoinitiator, and the molar ratio of carbon-carbon double bonds in the cardanol derivative to mercapto in the mercapto silane coupling agent to the photoinitiator is 1: (0.4-1): (0.01-0.05). The novel cardanol-based silane coupling agent is successfully prepared through a photo-initiation click chemistry technology. The coupling agent can significantly improve the initial bonding strength and high-temperature and high-humidity aging resistance of the adhesive, and has the advantages of environmental protection and wide application.

The invention discloses an electrically-assisted forming pure electroplastic effect measuring device and method based on contact type cooling. The device comprises a loading unit, an electrifying unit, a contact type cooling unit, a measuring unit and a control unit. The method is characterized in that a friction force calibration experiment is carried out, and system errors are quantified; then, under closed-loop temperature control, electrifying, deformation and dynamic cooling are synchronously carried out, so that the temperature of the sample is stabilized at the target temperature to completely offset the Joule heating effect; and finally, the measurement result is corrected based on the calibration data, the corrected electrified deformation data is compared with the thermal baseline data, and the difference value is the accurate quantized value of the pure electroplastic effect. According to the device and the method, the high-thermal-conductivity insulating ceramic chip is adopted for contact type cooling, the problem of material chemical pollution caused by liquid nitrogen injection is fundamentally avoided, system errors caused by contact are eliminated through an original friction force calibration and correction process, and in-situ, accurate and nondestructive measurement of the pure electroplastic effect of the material is achieved.

The invention belongs to the technical field of material chemistry, and particularly relates to an MOF catalyst containing high-valence copper and a preparation method and application of the MOF catalyst. According to the invention, Ag is doped on a Cu-based metal organic framework material framework through an ion exchange method, then the Ag is mixed with a binder solution to prepare slurry, the slurry is coated on an electrode substrate, the electrode substrate is dried to serve as a working electrode, constant potential or circulating potential is applied to the working electrode in a preset voltage range in an electrochemical system containing an electrolyte, and thus the Cu-based metal organic framework material is obtained. Cu (III) is generated in situ through electrochemical reconstruction, and the MOF catalyst containing high-valence copper is obtained. The MOF catalyst containing high-valence copper has excellent ammoxidation reaction activity and stability, is especially suitable for high-conversion-rate and high-selectivity ammoxidation reaction to prepare nitrite, and is suitable for industrial induced production application.

This invention discloses a method for preparing pseudoboehmite with high specific surface area and high conversion rate by sand milling and hydrolysis, belonging to the field of materials chemistry. The method involves using high-purity aluminum isopropoxide purified by vacuum distillation as a dispersant, and sand milling and stirring under specific pH, temperature, and vacuum conditions to complete the hydrolysis and aging process. Microwave drying is then employed to obtain a sample with a specific surface area >350 cm². 2 Boehmite powder with an alumina conversion rate of ≥76% per g can be used for the production of laser crystal-grade alumina and gem-grade alumina, and is also suitable for use as a catalyst support; moreover, the preparation method is simple to operate, easy to control, and easy to industrialize.

The invention discloses a 1, 2-dihydrobenzo silacyclohexane compound and a preparation method and application thereof, and discloses a preparation method for synthesizing two silicon-containing six-membered ring compounds with different substituent positions in one step by starting from the same raw material and controlling reaction conditions. A complex formed by a metal catalyst palladium salt and a phosphine ligand is used as a catalyst precursor, the chemical selectivity of a product is controlled by changing the structure of the ligand, and a series of silicon-containing six-membered ring compounds with high yield and high chemical selectivity are efficiently synthesized through intermolecular cycloaddition reaction. Compared with traditional cycloaddition and other reactions, the method for synthesizing the naphthenic compound is more efficient, direct and effective, various silicon heterocyclic compounds with different substituent groups, which cannot be prepared by a traditional method, can be obtained, and the method is widely applied to the fields of material chemistry and pharmaceutical chemistry.

The application belongs to the field of material chemistry, and particularly relates to a kind of one-side densification large-size biomimetic ceramic Janus film and a preparation method thereof.The Janus film is a two-layer structure composed of a dense layer and a loose layer, the dense layer is aragonite crystal, and the loose layer contains aragonite and calcite crystals.The application induces crystal densification growth by limited effect, does not need the extreme environment of high temperature and high pressure in traditional densification ceramic firing, successfully prepares one-side densification mineral film under mild experimental conditions, saves energy, and provides favorable conditions for subsequent mechanism research and expansion of synthesis method.

The invention relates to a magnetic drive micro-nano robot based on photocatalysis, a preparation method and application thereof, and belongs to the technical field of material chemistry. According to the magnetic drive micro-nano robot, bismuth oxyhalide serves as a carrier, spinel type ferrite magnetic nanoparticles are loaded on the surface of the carrier, the molecular formula of spinel type ferrite is MFe2O4, M is a divalent metal ion, and bismuth oxyhalide is BiOI of a flower-shaped structure. By effectively inhibiting photon-generated carrier recombination, widening the light absorption range, enhancing the light absorption intensity and improving the contact efficiency with pathogenic bacteria, the magnetically-driven micro-nano robot shows important application value in the antibacterial field.