502 results about "Ultraviolet absorption" patented technology

The invention discloses a colorimetric and fluorescent dual-mode nano-enzyme sensor. The colorimetric and fluorescent dual-mode nano-enzyme sensor comprises nano-enzyme, hydrogen peroxide and a colorimetric probe, wherein the nano-enzyme is prepared from ZrCl4, 2-aminobiphenyl dicarboxylic acid and Cu (NO3) 2 by a one-pot method; the colorimetric probe is TMB, can oxidize colorless TMB into blue oxTMB, generates an ultraviolet absorption peak at 652 nm, and has a strong fluorescence emission peak at 405 + / -5 nm. The zirconium-based metal organic framework UiO-67-NH2 with high stability is used as a carrier, Zr < 4 + > sites are replaced by part of Cu < 2 + >, the fluorescent nano-enzyme with peroxidase activity is formed, and the problems that free enzyme is difficult to recover, the stability is low and the like are solved.

The invention relates to an anti-yellowing automobile composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The yellow-resistant automobile composite film is prepared from the following components in parts by weight: 60 to 70 parts of PVC (Polyvinyl Chloride) master batch, 10 to 20 parts of TPU (Thermoplastic Polyurethane) master batch, 1 to 2 parts of plasticizer, 0.5 to 0.8 part of flatting agent, 0.1 to 2 parts of yellowing-resistant modifier and 0.1 to 2 parts of modified flame retardant, sym-triazine cyanuric chloride and a benzotriazole intermediate in the anti-yellowing modifier absorb ultraviolet rays and reduce yellowing of the ultraviolet rays on the composite material, and maleimide groups, maleic anhydride and isocyanurate rings for increasing the crosslinking density cooperate with one another, so that the heat resistance of the material is improved, and the yellowing is reduced; phosphorus and nitrogen main chains of phosphonitrilic chloride trimer in the modified flame retardant have a conjugation effect, so that a protective film is formed, oxygen is isolated, and the phosphonitrilic chloride trimer and nitrogen are synergistically flame-retardant; the anti-yellowing automobile composite film prepared by the invention not only has excellent ultraviolet absorption performance, heat resistance and anti-yellowing effects, but also has a good flame retardant effect.

The invention relates to a formamidine thiosulfate second-order nonlinear optical crystal and preparation and application thereof, the chemical formula of the crystal material is [CH (NH2) 2] 2SO3S, the molecular weight is 203.27, the crystal material belongs to an orthorhombic crystal system, the space group is P212121, the unit cell parameter is # imgabs 0 # alpha = beta = gamma = 90 degrees, Z = 4, and the unit cell volume is # imgabs 1 #. Under 1064nm laser irradiation, the frequency doubling intensity of the powder is about two times that of monopotassium phosphate crystals, and phase matching can be realized. In addition, the crystal material has a wide light transmission wave band, the ultraviolet absorption cut-off edge is 253 nm, the optical band gap is 4.90 eV, and the crystal material is easy to grow. The wavelength range of the coherent light source can be expanded by using optical frequency conversion technologies such as second harmonic generation and optical parametric amplification. Therefore, the crystal material has important application value in the fields of laser frequency conversion, photoelectric information storage and the like.

The invention relates to the technical field of organic material detection, in particular to an imine molecular sensor with a five-detection function, two-component gel as well as a preparation method and application of the imine molecular sensor. The imine molecular sensor has three signal responses of fluorescence on-off, ultraviolet absorption and color change to Fe < 3 + >, Co < 2 + > and Ni < 2 + > in a solution state, and has ultraviolet absorption and fluorescence on-off dual-detection performance to acid and alkali changes; the imine molecular sensor and cholesteryl half ester can form two-component gel through a heating-low-temperature ultrasonic cooling method; after Fe < 3 + >, Co < 2 + >, Ni < 2 + >, NaOH and HCl are respectively added, the orange of the gel becomes milky white, reddish brown, transparent red, milky white and milky white under sunlight, and the fluorescence of the orange of the gel disappears under an ultraviolet lamp, so that the rapid and sensitive detection of Fe < 3 + >, Co < 2 + >, Ni < 2 + >, acid and alkali under two states of the imine molecular solution and the gel is realized. The imine molecular sensor provided by the invention has the advantages of mild synthesis conditions, simple preparation and the like, and creates favorable conditions for popularization and application of the imine molecular sensor.

The invention provides a colorimetric / fluorescent dual-mode sensor, a preparation method of the colorimetric / fluorescent dual-mode sensor and application of the colorimetric / fluorescent dual-mode sensor in histamine detection. The colorimetric / fluorescent dual-mode sensor comprises a horseradish peroxidase-loaded metal organic framework (HRP-AIE-MOF), hydrogen peroxide and a chromogenic substrate o-phenylenediamine (OPD), horse radish peroxidase (HRP) in the HRP-coated AIE-MOF can oxidize colorless OPD into yellow 2, 3-diaminophenazine (DAP), an ultraviolet absorption peak is generated at 425 nm, a strong fluorescence emission peak is generated at 555 nm, the HRP-coated AIE-MOF has a strong fluorescence emission peak at 450 nm, and the HRP-coated AIE-MOF and a fluorescence signal of the DAP can form a ratio fluorescence sensor. According to the invention, the excellent catalytic ability of natural enzyme and the luminescence characteristic of AIE-MOF are integrated in one system, and high-sensitivity histamine detection is realized.

The invention relates to an oxime ester compound, a photocuring material and application, and belongs to the field of photoinitiators. The oxime ester compound is a compound with a structure as shown in a formula (1): # imgabs0 #, wherein R3 in the formula (1) is C6-C20 heteroaryl containing 1-3 Ns. The nitrogen-containing heterocyclic ring is introduced into the original structure, so that the conjugacy of molecules is enhanced, the ultraviolet absorption peak is subjected to red shift, and the compound is more suitable for an LED light source; in addition, due to the introduction of the nitrogen-containing heterocyclic ring, the solubility of molecules in a solvent is improved, so that the photoinitiator is dispersed more uniformly in the solvent, the system is clearer, the photosensitivity of the photoinitiator is improved, and a better effect can be realized by using a small amount of the photoinitiator.

The invention provides a colorimetric / fluorescent dual-mode nano-enzyme sensor, a preparation method thereof and application of the colorimetric / fluorescent dual-mode nano-enzyme sensor in formaldehyde detection. The sensor comprises a metal organic framework nano-enzyme AIE-MOF coated PCN-222 loaded with an AIE-MOF material, hydrogen peroxide and a chromogenic substrate o-phenylenediamine OPD; the metal organic framework nano enzyme PCN-222 in the AIE-MOF-coated PCN-222 can oxidize colorless OPD into yellow 2, 3-diaminophenazine DAP, an ultraviolet absorption peak is generated at the position of 450 nm, a strong fluorescence emission peak is generated at the position of 560 nm, the AIE-MOF-coated PCN-222 has a strong fluorescence emission peak at the position of 446 nm, and the AIE-MOF-coated PCN-222 and a fluorescence signal of the DAP can form a ratio fluorescence sensor. According to the invention, the excellent catalytic ability of the nano-enzyme and the luminescence characteristic of AIE-MOF are integrated in one system, so that high-sensitivity formaldehyde detection is realized.

Embodiments of the present disclosure provide a display panel and a display terminal. The display panel includes at least one ultraviolet sensing transistor and at least one control transistor disposed on a substrate, and a color film substrate including a light blocking unit; wherein the ultraviolet sensing transistor includes an ultraviolet absorbing layer, and an orthographic projection of the light blocking unit on the substrate covers an orthographic projection of the ultraviolet absorbing layer on the substrate. According to the embodiment of the present disclosure, the light blocking unit absorbs or blocks the visible lights to prevent the visible lights from entering into the ultraviolet absorbing layer.

The invention relates to an aminoguanidine oxalate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is (CN4H7) + (C2O4H)-, the crystal material belongs to a monoclinic system, the space group is P21, the cell parameters are # imgabs0 # and # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 95-100 degrees, gamma is equal to 90 degrees, and Z is equal to 2. The powder frequency-doubled effect of the nonlinear optical crystal (CN4H7) + (C2O4H)-disclosed by the invention under the irradiation of 1064nm laser is about 1.0 time of that of a KH2PO4 (KDP) crystal, and phase matching can be realized. In addition, the crystal material has the advantages of being short in ultraviolet absorption cut-off edge (290 nm), easy to grow and the like, and has important application value in the photoelectric conversion fields of stereolithography, solid-state lasers, optical communication, optical parametric amplifiers, optical parametric oscillators, laser frequency converters and the like.

The invention relates to a trimethylamine methanesulfonate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is [(CH3) 3NH] < + > [SO3CH3] <->, the molecular weight is 154.21, the crystal material belongs to an orthorhombic crystal system, and the space group is Pca21 (No.29). According to the present invention, the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation is about 0.5 time of the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation, phase matching can be achieved, and the ultraviolet absorption cutoff edge is less than 200nm. The crystal material is easy to grow and shows important application value in the aspects of electro-optical modulation, holographic storage elements, frequency doubling devices and the like.

The utility model discloses an anti-ultraviolet resin lens which comprises a first resin sheet and a second resin sheet. An ultraviolet absorption layer is arranged on the upper surface of the first resin sheet; an ultraviolet reflecting film is arranged on the lower surface of the second resin sheet, a laminated layer is arranged between the ultraviolet absorbing layer and the ultraviolet reflecting film, an organic silicon coating is arranged on the upper surface of the second resin sheet, a first anti-scraping layer is arranged on the upper surface of the organic silicon coating, a first oleophobic layer is arranged on the upper surface of the first anti-scraping layer, and a second oleophobic layer is arranged on the upper surface of the second anti-scraping layer. The first anti-scraping layer is arranged on the lower surface of the first resin sheet, the second anti-scraping layer is arranged on the lower surface of the first anti-scraping layer, the second oleophobic layer is arranged on the lower surface of the second anti-scraping layer, the ultraviolet absorption layer is a zinc oxide ultraviolet absorption layer, the ultraviolet reflection film comprises a first oxidation film and a second oxidation film, and the first oxidation film is arranged on the lower surface of the second resin sheet. The ultraviolet absorption layer and the ultraviolet reflection film are arranged between the two resin sheets, it can be guaranteed that the anti-ultraviolet coating structure cannot be abraded in the using process, and therefore the good using effect is achieved, and the service life is long.

The invention belongs to the field of materials, and particularly discloses a film capable of regulating and controlling ultraviolet rays and a preparation method and application thereof. The thin film comprises a heat insulation layer, an ultraviolet absorption layer and a heat preservation layer which are sequentially arranged in a stacked mode. The ultraviolet absorption layer is prepared from the following components in percentage by mass: 0.1 to 1 percent of UVA ultraviolet absorbent, 0.5 to 5 percent of UVB ultraviolet absorbent and 94 to 99.4 percent of resin matrix. According to the film disclosed by the invention, the UVA ultraviolet absorbent and the UVB ultraviolet absorbent are introduced into the ultraviolet absorption layer, and the light intensity of the UVA ultraviolet and the UVB ultraviolet which penetrate through the film is regulated and controlled by partially absorbing ultraviolet rays in sunlight, so that an ultraviolet environment suitable for plant growth is obtained; the ultraviolet rays are effectively utilized by the plants, so that the content of nutrient substances such as anthocyanin and quercetin in the fruits is increased.

The invention relates to the technical field of nano materials, and discloses a biomass carbon dot as well as a preparation method and application thereof. The biomass carbon dots are prepared from the following raw materials: aniline and flavonol compounds. According to the biomass carbon dot provided by the invention, flavonol compounds derived from biomass such as luteolin and peanut shells are taken as raw materials, nitrogen doping is carried out through aniline, and the biomass carbon dot has relatively good ultraviolet absorption capacity in UVA and UVB ranges and also has excellent visible light permeability and high-temperature ultraviolet aging resistance; the preparation method of the biomass carbon dots is simple in steps, raw materials are easy to obtain, and one-step synthesis can be achieved through a solvothermal method; the biomass carbon dots are doped on the basis of a common polyurethane film, the ultraviolet absorption capacity of the film in UVA and UVB ranges is remarkably improved, meanwhile, the visible light transmittance of the film is not affected, the weather resistance of the film is good, the film is suitable for the agricultural field, and normal photosynthesis can be guaranteed while ultraviolet damage to crops is reduced.

The invention relates to the field of glass, in particular to lithium-free alkali aluminosilicate glass as well as a preparation method and application thereof. According to the glass, SiO2, Al2O3, Na2O, K2O, MgO and ZrO2 serve as main components, the content of Li2O is lower than 100 ppm, a nitrate-sulfate-carbon powder composite clarifying agent is adopted, the number of bubbles and the content of residual sulfur are effectively reduced, and use of a toxic or ultraviolet absorption type clarifying agent is avoided. ZrO2 is obtained by calcining a zirconium-based metal-organic framework material and is good in dispersity, and the devitrification resistance is improved. During float forming, through micro-positive pressure, high-purity protective atmosphere and four-zone gradient temperature control, the tin penetration depth is controlled within 15 microns, and the surface tin content is smaller than or equal to 4 micrograms / cm < 2 >. The obtained glass has high light transmittance, high hardness and excellent chemical strengthening performance, and is suitable for the high-end fields of electronic display cover plates, vehicle-mounted screens, touch panels, photovoltaic substrates and the like.

The invention relates to the technical field of plastics, and particularly discloses modified plastic particles for automobile lamps and a preparation process of the modified plastic particles. The modified plastic particle for the automobile lamp is prepared from the following raw materials in parts by weight: 120 to 125 parts of polybutylene terephthalate, 30 to 35 parts of polystyrene, 18 to 22 parts of modified kaolin, 8 to 12 parts of nano silicon dioxide, 15 to 18 parts of modified straw fiber, 6 to 10 parts of microcrystalline ceramic powder, 4 to 6 parts of glycerol monolaurate, 3 to 5 parts of zinc stearate, 1 to 2 parts of antioxidant and 1.5 to 2.5 parts of ultraviolet light absorber. The prepared modified plastic particles for the automobile lamp have good mechanical properties such as impact resistance and wear resistance, so that the plastic has good durability.

The invention discloses an infrared shielding polyurethane glass film and a preparation method thereof, and relates to the technical field of high polymer materials. When the infrared shielding polyurethane glass film is prepared, an organic nickel complex and 3-imidazole-1-propionic acid react to prepare a functional cross-linking agent; the preparation method comprises the following steps: reacting 4-aminophenylacetonitrile with 3-hydroxypropyl acrylate and quinoline-4-formaldehyde in sequence to prepare an ultraviolet absorption monomer; the preparation method comprises the following steps: carrying out reaction polymerization on polypropylene glycol, an ultraviolet absorption monomer, 1, 4-butanediol and 4-chloromethyl-1, 3-phenyl diisocyanate to prepare polyurethane; the tungsten-doped titanium dioxide and chloropropyltriethoxysilane are subjected to a reaction, and modified titanium dioxide is prepared; uniformly mixing polyurethane, modified titanium dioxide, a functional cross-linking agent and acetone, and coating and curing to obtain the infrared shielding polyurethane glass film. The infrared shielding polyurethane glass film prepared by the invention has excellent infrared shielding, anti-aging, antibacterial and mechanical properties.

The invention provides an original staphylococcus aureus nucleic acid aptamer and a detailed screening and preparation process thereof, and aims to improve the detection accuracy and efficiency of common and dangerous strains. The specific DNA sequence (SEQ ID No: 1) of the aptamer is obtained through a series of complex bioinformatics and calculation processes, and comprises the following steps: carrying out a docking experiment on evolved oligonucleotide fragments by using molecular simulation software AutoDock, and calculating the affinity between each short-chain fragment and a target staphylococcus membrane protein FnBPA. Thirdly, the data are optimized through an ant colony algorithm, so that the sequence with the highest combination efficiency is identified; after the aptamer sequence with high affinity is obtained, the biosensor based on the aptamer is developed. The construction process of the sensor comprises the working procedures of mixing of activating reactants and preparation of the fluorescent probe and the quenching probe, and finally a sensitive and specific fluorescent quenching probe is formed. The change of the fluorescence emission wavelength and the ultraviolet absorption wavelength indicates that the aptamer is successfully fixed, so that a rapid and reliable method is provided for detecting the staphylococcus aureus. The method has very important application prospects in the fields of food safety monitoring, medical diagnosis and the like, the time required by means such as traditional microbial culture and the like can be remarkably shortened, and meanwhile, the cost selection lower than that of a molecular biological technology is provided.

The invention discloses an ultraviolet absorption gas analyzer, and relates to the technical field of gas analyzers. The ultraviolet absorption gas analyzer comprises an analyzer outer shell, the analyzer outer shell is connected with a first supporting seat and a second supporting seat, the first supporting seat is fixedly connected with a light source supporting seat, the light source supporting seat is provided with an ultraviolet light source generator, a rotating disc is rotatably connected between the first supporting seat and the light source supporting seat, and the rotating disc is provided with a rotating shaft. A plurality of groups of optical filter main bodies are arranged on the rotating disc, a measuring air chamber is arranged between the first supporting seat and the second supporting seat, and a light source receiver is arranged on the second supporting seat. According to the ultraviolet absorption gas analyzer, on one hand, protection is provided for the optical filter main body, the optical filter main body is isolated from the external environment, on the other hand, when the optical filter main body is replaced, the replacement of a plurality of groups of optical filter main bodies can be realized only by rotating the rotating disc, and the replacement process is convenient to operate, time-saving and labor-saving.

The invention relates to the technical field of anti-aging agents, and discloses a preparation method of an anti-aging agent and application of the anti-aging agent in plastics, the anti-aging agent contains styrene groups, and can be well fused and grafted with polyolefin such as polypropylene under the action of an initiator dibenzoyl peroxide or dicumyl peroxide, so that the anti-aging agent has a good anti-aging effect. The influence on the mechanical strength of the polyolefin plastic is very small, and the problem that physical blending can cause great influence on the mechanical strength and the use performance of the plastic can be avoided. Meanwhile, a phenol triazine structure contained in the anti-aging agent has a unique ultraviolet absorption effect, and a hindered amine structure is contained, so that the photo-oxygen degradation reaction of the polyolefin plastic can be inhibited through multiple ways of capturing free radicals and decomposing hydroperoxide, and through an accelerated aging experiment of xenon lamp irradiation, the plastic keeps very high tensile strength, and the anti-aging effect is good. And excellent thermo-oxidative aging resistance and ultraviolet radiation aging resistance are shown.

The invention relates to the technical field of material performance testing, in particular to a method and a system for testing the sunscreen performance of a composite sunscreen thermal insulation material. According to a surface temperature field distribution image, a heat distribution disorder index and a heat distribution disorder variable coefficient of the surface of the material are analyzed, and an interface dynamic effect intensity factor of the material is quantified; the influence of thermal resistance and thermal expansion difference on heat conduction stability is accurately evaluated; meanwhile, based on spectral data of all wave bands and surface average temperature data, correlation characteristics of the ultraviolet absorption amount, the heat loss amount and the surface temperature rise rate are analyzed, a photothermal conversion efficiency index is established, the thermal stress accumulation process is tracked in combination with the temperature gradient and the thermal stress history, and performance deviation caused by the cross-scale dynamic effect is revealed; the relation between the dynamic effect and the thermal stress is further analyzed, a real-time compensation value is generated, a traditional static test result is corrected, and therefore system errors caused by photothermal conversion nonlinearity, interface thermal stress accumulation and multi-layer structure anisotropy are overcome.

The present invention provides an oxime ester photoinitiator, a photocurable resin composition and an application. The above-mentioned oxime ester photoinitiator has a structure shown in the general formula (I): compared with the existing oxime ester photoinitiators, the oxime ester photoinitiator with the general formula (I) structure has better stability, so under the irradiation of ultraviolet light, it can effectively suppress the generation and volatilization of small molecule fragments, and almost no overflow gas is generated after curing; at the same time, because the above-mentioned oxime ester photoinitiator has a specific substituent group, it has a strong ultraviolet absorption performance, thereby improving its sensitivity, and the oxime ester photoinitiator also has a high yellowing resistance. In addition, the oxime ester initiator with the structure shown in the general formula (I) can be used in a UV-LED light curing system, and is particularly suitable for initiation under the action of a 365nm light source.

The invention discloses a composite pollutant control system for high-risk space and ground, and belongs to the field of public health, environment disinfection and pollution control. The system integrates a purification air duct, a module complex (comprising an ultraviolet disinfection module, a photocatalysis enhancement module, an induction module, a control system module and the like), a safety protection module and an ultraviolet reflection suppression module. The air flow direction of the purification air channel is adjusted according to the pedestrian flow time interval distribution characteristics in the pedestrian flow dense state. In a discontinuous pedestrian flow state, the low-pressure mercury lamp is started to effectively kill microorganisms on the ground and in the air, and the killing efficiency is improved in combination with the photocatalytic enhancement module. The sensing module monitors the approaching situation of people in real time, ensures that the ultraviolet lamp is immediately turned off when people exist, and guarantees safety. And the ultraviolet reflection suppression module adopts an ultraviolet absorption material on the ground to avoid ultraviolet reflection, so that the injury to personnel is reduced. The system controls air and ground composite pollutants under man-machine coexistence, and is suitable for environmental safety guarantee of high-risk complex scenes.

The invention relates to the technical field of coatings, in particular to a double-layer super-hydrophobic passive daytime radiation cooling coating and application thereof. The super-hydrophobic passive daytime radiation cooling coating is developed through a two-step spraying process. And the bottom layer is formed by combining a high refractive index TiO / Al2O3 composite material and modified polydimethylsiloxane. The top layer employs high band gap SiO to mitigate ultraviolet absorption and combines unmodified PDMS to ensure high thermal emissivity and low surface energy. By accurately controlling the particle size distribution and concentration gradient between the two layers of structures, the optimized SPDRC coating shows excellent optical performance, the solar reflectivity is 93.2%, and the mid-infrared thermal emissivity is 95.4%. Under the direct irradiation of the sun, the temperature reduction of 10 DEG C is obviously lower than that of the environment, and the radiation cooling power of 125 Wm <-2 > is realized. In addition, the coating has a water contact angle of 155 degrees, has strong super-hydrophobicity, can ensure excellent self-cleaning performance and long-term durability, and is suitable for actual outdoor application of building cooling.

The invention relates to the technical field of photovoltaic packaging materials, and discloses a packaging material for a photovoltaic module and a preparation method of the packaging material. The preparation method comprises the following steps: firstly, respectively preparing the hydrolysis-resistant master batch, the ultraviolet absorption master batch and the light-stable master batch; then respectively preparing weather-resistant layer master batches (containing hydrolysis-resistant master batches, ultraviolet absorption master batches, light-stable master batches and modified polyester chips in specific parts by weight), core layer master batches (containing modified polyester chips and connecting particles in specific parts by weight) and bonding layer master batches (containing bonding materials, modified polyester chips and hydrolysis-resistant master batches in specific parts by weight); and carrying out three-layer co-extrusion and cooling on the weather-resistant layer master batch, the core layer master batch and the bonding layer master batch in specific parts by weight, and then carrying out two-way stretching, sizing and cooling to obtain the packaging material for the photovoltaic module. The packaging material is formed at a time through co-extrusion double-drawing, the processes of coating a coating and / or compounding other materials and the like do not need to be added, and the packaging material is simple in process, low in cost, excellent in comprehensive performance and environmentally friendly.

The invention discloses a preparation method of calcium carbonate carbon dot fluorescent powder and an ultraviolet aging resistant fluorescent sealant, and relates to the field of sealants, carbon dot powder is prepared by controlling the weight ratio of anhydrous citric acid to cysteine hydrochloride, the proportion of amino groups and carboxyl groups on the surfaces of carbon dots can be effectively regulated and controlled, and then the ultraviolet absorption performance of the carbon dots is regulated and controlled. And dissolving the carbon dot powder in a calcium salt solution to form a mixed solution, dropwise adding the mixed solution into a carbonate solution for reaction, and preparing the calcium carbonate carbon dot fluorescent powder which is good in fluorescence property and is beneficial to improving the ultraviolet aging property of the sealant by a simple and rapid preparation method. The silane modified polyether prepolymer is selected as a base material, polypropylene glycol, an organic tin catalyst and 3-(aminopropyl) trimethoxysilane are compounded, the prepared sealant has excellent fluorescence performance, the ultraviolet aging resistance of the sealant can be remarkably improved, and the degradation degree of mechanical properties of the sealant before and after aging is remarkably reduced.

The invention relates to the technical field of nano biosensing, in particular to a cerium-based metal organic framework loaded gold nano-cluster composite material as well as a preparation method and application thereof. A fluorescent and colorimetric dual-channel sensing platform is formed by compounding AuNCs and Ce-MOF and is used for detecting alpha-glucosidase and screening an alpha-glucosidase inhibitor, the cerium-based metal organic framework loaded gold nano-cluster composite material catalyzes and oxidizes a colorless substrate ABTS to generate colored oxABTS, and the oxABTS has characteristic ultraviolet absorption at 410 nm, so that the detection of alpha-glucosidase and screening of an alpha-glucosidase inhibitor can be realized. And the fluorescence of the cerium-based metal organic framework loaded gold nano-cluster composite material can be efficiently quenched through an inner filtering effect. Alpha-glucosidase catalyzes hydrolysis of a substrate AAG to generate AA, the AA can inhibit oxidation of ABTS regulated and controlled by a cerium-based metal organic framework loaded gold nano-cluster composite material, and then reduction of oxABTS ultraviolet absorption and fluorescence recovery of ACM are caused, so that dual-channel detection of alpha-GLU is realized through dual-signal output of colorimetric and fluorescence signals.

The invention provides a passive radiation refrigeration fabric as well as a preparation method and application thereof, and belongs to the technical field of automotive interior parts. According to the invention, the polymer of the pre-laid layer can provide good interface bonding force and has good sunlight refraction capability. The inorganic matter can provide good solar ray reflection performance, ultraviolet absorption capacity and thermal radiation performance and has good heat resistance and thermal stability, the resin can evenly disperse the inorganic matter, the structural stability of the cooling layer is guaranteed, and the reflection capacity and thermal radiation performance of the cooling layer can be further enhanced.

The invention relates to the technical field of water quality detection, in particular to a method for evaluating the toxicity level of halogenated disinfection byproducts based on protease. According to the invention, fluorescence spectrum, synchronous fluorescence spectrum and ultraviolet absorption spectrum technologies are adopted to research the interaction of seven cyclic and heterocyclic halogenated disinfection byproducts with pepsin and trypsin. A fluorescence quenching mechanism is analyzed through a Stern-Volmer equation, a double logarithmic equation and the like, and the influence of the halogenated disinfection by-product on the conformation of the protease is disclosed in combination with constants and thermodynamic parameters. The binding force of the halogenated disinfection by-product and protease is in positive correlation with cytotoxicity, a new index is provided for toxicity evaluation of the halogenated disinfection by-product, and optimization of a drinking water disinfection process and formulation of a water quality standard are facilitated.

The invention belongs to the technical field of PET (polyethylene terephthalate) film materials, and particularly discloses a PET heat-sealing film for blocking infrared rays and ultraviolet rays as well as a preparation method and application of the PET heat-sealing film. The PET heat-sealing film provided by the invention is of a multi-layer film structure and comprises a near-infrared and ultraviolet absorption layer, a transparent layer and a heat-sealing layer, wherein the near-infrared absorption layer and the ultraviolet absorption layer have an absorption effect on near-infrared rays and ultraviolet rays, so that the transmission of invisible light can be reduced, and the blocking effect of the film on radiation can be improved; the transparent layer takes optical-grade transparent PET as a preparation raw material, so that the transparency of the film can be improved, the stiffness of the film can be increased, and the winding effect can be improved; the heat sealing layer can endow the film with self-adhesion, so that the film can be directly compounded with glass at a high temperature, and the use of an adhesive is avoided. In addition, the preparation process of the PET heat-sealing film is simple, the operability is high, industrial production is easy to perform, and the PET heat-sealing film has good application prospects and high economic value.

The invention relates to the field of water quality detection, in particular to a water quality sampling detection method and device applied to a small and micro wetland unit. The method comprises the following steps: determining a turbidity coefficient according to scattered light intensity of a target water sample under different wavelengths, absorbance of a target interval in an ultraviolet absorption spectrum and fluorescence intensity of a target area in a fluorescence spectrum; determining a scattering equivalent absorption value of each wavelength according to the scattered light intensity of the target water sample under each wavelength, the absorbance corresponding to each wavelength in the ultraviolet absorption spectrum and the turbidity coefficient; determining a real ultraviolet absorption signal of each wavelength according to the absorbance corresponding to each wavelength in the ultraviolet absorption spectrum and the scattering equivalent absorption value of the wavelength; correcting the fluorescence spectrum according to the turbidity coefficient and the scattering equivalent absorption value of each wavelength to obtain a corrected fluorescence spectrum; and detecting the water quality according to the corrected fluorescence spectrum and the real ultraviolet absorption signal of each wavelength. According to the invention, accurate water quality sampling detection can be provided.