19results about How to "Improve photostability" patented technology

The invention relates to environment-friendly hydrophobic ink and a preparation method thereof, and belongs to the technical field of water-based ink. A copolymerization modifier capable of being combined in a water-based polyacrylate emulsion in an initiation polymerization mode in the stage of preparing the modified water-based polyacrylate emulsion is prepared, and an o-hydroxy aromatic ketone structure in the copolymerization modifier can endow water-based ink with lasting ultraviolet absorption performance; the trifluoromethyl structure can reduce the surface energy of the water-based ink, and the benzimidazole ring structure can form stable coordinate bonds with metal ions, so that the bonding performance of the water-based ink and a metal substrate is enhanced; when the copolymerization modifier is used for modifying the water-based polyacrylate emulsion, the long-term performance, the hydrophobic and oil-resistant performance and the adhesion performance on the surface of a metal base material of the finished water-based ink can be effectively improved.

The application relates to a double-channel near-infrared two-region rare earth nanometer probe and a preparation method and application thereof. The double-channel near-infrared two-region rare earth nanometer probe comprises a probe A and a probe B; the probe A and the probe B are both three-layer structures, and sequentially comprise a core layer, a shell layer and a hydrophilic coating layer from inside to outside; in the probe A, the core layer material is NaYF4:Er, and the shell layer material is NaYF4; in the probe B, the core layer material is NaYbF4:Ce,Er,Zn, and the shell layer material is NaYF4. The probe has the characteristics of 808 nm / 940 nm orthogonal excitation and 1532 nm narrow-band emission, has the advantages of high light stability, rapid metabolism and high biocompatibility, and can realize deep tissue high signal-to-noise ratio in-vivo imaging.

The application discloses a kind of near-infrared benzothiadiazole dye sensitized rare earth upconversion luminescence nano-probes and preparation method thereof;Probe is composed of near-infrared benzothiadiazole dye and upconversion nanoparticle, benzothiadiazole dye is compounded with ligand-free lanthanide ion doped upconversion nanoparticle, and upconversion luminescence is enhanced.This application preparation method is simple, and it does not involve complex core-shell structure and energy migration process, benzothiadiazole dye is directly compounded with ligand-free rare earth nanoparticle, and upconversion luminescence nano-probe is formed, under the irradiation of 808nm laser, the emission spectrum of benzothiadiazole dye and the absorption spectrum of sensitizer ion in upconversion nanoparticle overlap, which can effectively enhance the upconversion luminescence intensity of nano-probe, and keep good light stability, keep more than 90% of initial luminescence intensity under the irradiation of 120 minutes excitation light.

The application belongs to the cross field of nanomaterials and coordination chemistry, and specifically discloses a near-infrared responsive photothermal silver-palladium nanocluster material, a preparation method and application in near-infrared photothermal conversion. 362 H 270 Ag 20 Cl4F 12 P8Pd5Sb2, which is abbreviated as Ag 20 Pd5(4‑EBP) 18 (DPPP)4(SbF6)2·2CH2Cl2, belongs to a monoclinic system, and a space group is P21 / n, a =16.228(13)Å, b =40.670(3)Å, c =25.941(2)Å, α=90°, β =100.283(2)°, gamma =90°, V=16846(2)Å 3 , and a molecular weight is 8170.22 Da. The preparation method has short process flow, simple operation, and raw materials are easy to obtain. The photothermal silver-palladium nanocluster has a high photothermal efficiency of 73.25% under 915 nm (0.6 W / cm 2 ) laser excitation, and has good application prospect.

The invention relates to the field of fluorescent dyes, in particular to a near-infrared fluorescent dye for brain imaging as well as a preparation method and application of the near-infrared fluorescent dye. The near-infrared fluorescent dye for brain imaging has the advantages of novel structure, good biocompatibility, large Stokes shift, high light stability, high fluorescence signal-to-noise ratio and the like; the near-infrared fluorescent dye prepared by the invention is simple in preparation process, mild in reaction condition, short in synthesis path and beneficial to industrial production, and has a wide application prospect.

The application provides a Bi2O2CO3-MIL-68(In) heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials, the field of persulfate catalysis and the field of environmental governance. The composite material is obtained by loading Bi2O2CO3 on the surface of MIL-68(In) to form a Z-type heterojunction structure; the Bi2O2CO3 is a spherical body with a diameter of 200-500 nm, and the surface is a stacked granular structure; the MIL-68(In) is a regular hexahedral rhombic rod-shaped structure with a particle size of 5-10 mu m, and the Bi2O2CO3 is dispersedly loaded on the surface of the MIL-68(In). The application has the advantages of simple operation, strong visible light absorption capacity of the heterojunction material, stable photocatalytic performance, high degradation efficiency and the like, and has a potential application prospect in the field of photocatalytic persulfate.

The application discloses a single-particle luminescent material for single molecule detection, a preparation method and application thereof, and comprises the following steps: S1, styrene purification; S2, preparation of a Nile red fluorescent precursor oil phase; S3, dissolving sodium dodecyl sulfate and sodium bicarbonate in deionized water to obtain a constrained emulsion system; S4, mixing the Nile red fluorescent precursor oil phase with the constrained emulsion system to obtain a pre-emulsion; and S5, performing a free radical polymerization reaction to obtain the single-particle luminescent material. The application utilizes the strong affinity between Nile red and styrene monomers, realizes uniform mixing of the dye before polymerization, and avoids uneven distribution and leakage risks caused by later labeling. In the single-particle luminescent material, the polystyrene matrix provides a closed hydrophobic environment for the dye molecules, effectively shields the quenching of the excited state by water molecules and dissolved oxygen, and significantly improves the light stability and anti-flickering ability of the material in single molecule detection.

The application belongs to the technical field of biological medicine, and provides a photosensitizer, a targeted delivery nano platform and application. A preparation method of the photosensitizer comprises the following process: a Suzuki coupling reaction is used to synthesize an intermediate with an aldehyde group by taking a brominated or iodinated triphenylamine as a precursor and reacting with boric acid, and then a Knoevenagel condensation reaction is used to convert the terminal aldehyde group into a strong electron-withdrawing dicyanovinyl group by reacting the aldehyde group intermediate with malononitrile, so as to synthesize the photosensitizer PSs. The application takes a structure-optimized photosensitizer (used for generating ROS and inactivating viruses) and a STING agonist (used for activating the STING pathway and inducing cell death) as core treatment components, and takes a rabies virus glycoprotein peptide as a active targeting ligand, so that the "PDT-immune" synergistic inactivation of RABV can be realized.

The application belongs to the technical field of functional pigments, and particularly relates to a preparation method of high-light-resistance composite pigments. The preparation method of the application is that: after pretreatment and cleaning, hexagonal boron nitride is obtained to be modified boron nitride nanosheet, and then the modified boron nitride nanosheet is compounded with organic pigments to obtain ideal high-light-resistance composite pigments. The modified boron nitride nanosheet used in the application can be better combined with the organic pigments by using the principle of entropy increase, the rich electron boron-nitrogen plane of the hexagonal boron nitride and the aromatic conjugated system of the lithol red molecules produce pi-pi stacking interaction, and then the two are driven to self-assemble to form high-light-resistance composite pigments, and the high-light-resistance composite pigments form a structure that is compact. The high-light-resistance composite pigments obtained by the application still maintain the chemical structure and gloss of the original organic pigments, and have excellent stability and good light resistance, and the problem of poor light resistance of the organic pigments is solved.

The application discloses a method for determining the content of carvacol in compound fertilizer, and the method comprises gas phase determination and liquid chromatography, and the gas chromatography method for determining the content of carvacol in compound fertilizer comprises the following steps: S1, sample pretreatment; S2, matrix purification; S3, chromatographic analysis; and S4, quantitative calculation; in the application, a silica gel SPE column is used to replace a traditional diatomite column in the GC method, the polarity impurity adsorption is enhanced through ethyl acetate-hexane gradient activation, sodium chloride salting-out and EDTA complex metal ions are introduced in the HPLC method, the number of miscellaneous peaks in the GC chromatogram is reduced, the separation degree of the carvacol peak is improved, and the service life of the HPLC column is prolonged; the GC method is operated under the conditions of temperature control ultrasonic at 35±2 DEG C and full light avoidance; the HPLC method adopts room temperature methanol-water system extraction, and the recovery rate of the GC method is improved; the HPLC method avoids the 60 DEG C concentration requirement of acetonitrile extraction, and the light stability is improved.

The invention discloses a method for determining the content of carvacrol in a compound fertilizer, the determination method comprises a gas chromatography method and a liquid chromatography method, the gas chromatography method for determining the content of carvacrol in the compound fertilizer comprises the following steps: S1, sample pretreatment; s2, matrix purification; s3, performing chromatographic analysis; s4, quantitative calculation; according to the GC method, a silica gel SPE column is adopted to replace a traditional diatomite column, and polar impurity adsorption is enhanced through ethyl acetate-normal hexane gradient activation; sodium chloride salting-out and EDTA complexing metal ions are introduced in the HPLC method, so that impurity peaks of a GC chromatogram are reduced, the carvacrol peak separation degree is improved, and the service life of an HPLC column is prolonged; performing temperature-controlled ultrasonic treatment at 35 + / -2 DEG C by a GC method and performing whole-process light-shielding operation; the HPLC method adopts a room-temperature methanol-water system for extraction, and the recovery rate of the GC method is improved; the HPLC method avoids the 60 DEG C concentration requirement of acetonitrile extraction, and the light stability is improved.

The invention discloses a titanium dioxide-quantum dot-silicon dioxide composite material with a multilayer core-shell structure as well as a preparation method and application of the titanium dioxide-quantum dot-silicon dioxide composite material. The core layer is composed of titanium dioxide nano-particles, the quantum dot middle layer is adsorbed to the surface of the core layer in a bridging mode through a silane coupling agent, and the compact silicon dioxide shell layer wraps the quantum dot middle layer. The method comprises the following steps: titanium dioxide nanoparticles are subjected to silanization modification to introduce sulfydryl, quantum dots are subjected to ligand exchange to obtain water-soluble sulfhydrylated quantum dots, the water-soluble sulfhydrylated quantum dots and the titanium dioxide nanoparticles form a quantum dot-titanium dioxide compound through interaction of the sulfydryl, and finally, a silicon dioxide shell is formed through silicon source hydrolytic condensation under a weak alkaline condition. Through core-functional layer-shell collaborative design, the problems that a traditional quantum dot composite material is weak in binding force, the quantum dots are prone to falling off and the stability is poor are solved, and the quantum dot composite material can be widely applied to the fields of photoelectric devices, photocatalytic materials and biological fluorescent markers.

The application discloses a preparation method of aluminum-doped zinc oxide with excellent light stability and ultraviolet shielding performance and application thereof, and belongs to the technical field of functional materials, and comprises the following steps: (1) Zn(CH3COO)2 and Al(NO)3 are weighed, mixed, and then methanol is added thereto, and stirring is conducted until all the solids are dissolved to obtain a primary mixed solution for standby use; (2) a KOH methanol solution is prepared, stirring is conducted until all the KOH is dissolved, then the KOH methanol solution is added drop by drop into the primary mixed solution obtained in the step (1), and stirring is uniformly conducted to obtain a mixed solution for standby use; (3) the mixed solution obtained in the step (2) is subjected to water bath heating and stirring, and after completion, filtration, washing and drying are conducted, and finally the obtained solid is calcined to obtain the product. According to the application, the ion doping engineering is accurately carried out starting from the material body design, under the premise that the ultraviolet shielding performance is not damaged, the photo-generated carrier separation is actively and effectively inhibited, the recombination of the photo-generated carrier is promoted, the light stability is significantly improved, and the generation of ROS is reduced.

The present application relates to the technical field of polyvinyl chloride foam material preparation, and particularly relates to a polyvinyl chloride electromagnetic shielding foam material and a preparation method thereof, wherein polyvinyl chloride resin, diisooctyl phthalate, magnesium hydroxide, copper-plated Mxene, light calcium carbonate, a heat stabilizer, a light-proof agent and a lubricant are uniformly mixed according to a certain weight ratio, and then are mixed by using a high-temperature mixing machine, and then are subjected to mold pressing to obtain a PVC composite material forming sample; the PVC composite material forming sample is added into a barrel of a conical twin-screw extruder, is subjected to extrusion forming, is subjected to pre-stretching, and then is subjected to foaming treatment to obtain the polyvinyl chloride electromagnetic shielding foam material. After the pre-stretching process, the polyvinyl chloride electromagnetic shielding foam material is obtained, the cell morphology in the polyvinyl chloride electromagnetic shielding foam material has a certain orientation along the stretching direction, the cell size is large, the specific surface area of the cells is increased, and the electromagnetic shielding performance of the material is improved.

The application belongs to the technical field of organic synthesis, and discloses an equilateral triangle BODIPY photodynamic sterilization fluorescent probe (Tri-TPA-I-BODIPY) and a preparation method thereof. The Tri-TPA-I-BODIPY is an equilateral triangle structure composed of two triphenylamine and one fluoroboron dipyrryl. The triphenylamine group has unique free radical properties, and the introduction of the group into the BODIPY can enhance the photocatalytic activity of the BODIPY. The unique equilateral triangle structure greatly enhances the light stability of the Tri-TPA-I-BODIPY. After modification by heavy atom iodine, the photosensitivity of the BODIPY can be improved, and the yield of reactive oxygen species (ROS, mainly singlet oxygen) can be improved. The singlet oxygen can resist eradication of bacteria, so the Tri-TPA-I-BODIPY can effectively achieve the purpose of photodynamic sterilization treatment of Alzheimer's disease.

This invention proposes a near-infrared responsive antibacterial nanomaterial, its preparation method, and its application. The near-infrared responsive antibacterial nanomaterial uses CuO2 nanoparticles and ICG as the core and PCM phase change material as the shell. It has good antibacterial properties, no drug resistance, and stability. Moreover, it achieves combined antibacterial activity in three modes: CDT / PDT / PTT, exhibiting broad-spectrum antibacterial properties and good biocompatibility.

The present application relates to a kind of rare earth complex light stabilizer and its preparation method and use, the rare earth complex light stabilizer includes [Ce (triRNTB) 2]X3 And / or RE (BP) 3, the rare earth complex light stabilizer includes 40-100 parts by weight of [Ce (triRNTB) 2]X3 And 0-60 parts by weight of RE (BP) 3.The present application uses the rare earth complex as new functional additive is introduced into organic fluorescent dye light conversion system.By constructing "light conversion-stable" dual functional composite system, both can solve the light stability bottleneck of small molecule dye, also can realize light conversion efficiency compensation using the light-induced luminescence enhancement effect of complex.The strategy provides innovative material design ideas for developing long life, high stability blue light conversion film, and has important practical significance for promoting the technology upgrading of light conversion material.

The application belongs to the technical field of quantum dot synthesis, and specifically discloses a synthesis method of large-size high-light-efficiency narrow-spectrum-band multi-element blue quantum dots, which comprises the following steps: preparing a quantum dot core solution with a low doping ratio, and washing out the inner core in the quantum dot core solution; introducing inorganic fluoride ions to control the growth behavior of the quantum dot core, so that the quantum dot core grows uniformly, and the fluorescence spectrum data of the growth process are monitored; when the fluorescence spectrum data reaches an expected value, the growth of the quantum dot core is immediately stopped; and the stopped quantum dot core is coated with a protective shell of ZnSe and ZnS. The synthesis method of the large-size high-light-efficiency narrow-spectrum-band multi-element blue quantum dots can avoid non-uniform growth caused by excessively large size, reduce the Te doping ratio in the core, and reduce the spectral tailing caused by non-uniform Te doping, thereby providing a feasible path for preparing high-performance blue light electroluminescent diodes and realizing commercialization of quantum dots.

The application discloses an anti-yellowing master batch for polyurethane elastic fiber, a preparation method thereof and application of the anti-yellowing master batch in shoe materials, and belongs to the technical field of anti-yellowing master batches. The anti-yellowing master batch for polyurethane elastic fiber is composed of polyurethane resin, an anti-ultraviolet additive, a thermal oxidation stabilizer, nano additive A and nano additive B. The preparation method of the nano additive A is as follows: zinc chloride and water are added into a mixing device, stirring is carried out at room temperature, mixing is carried out with titanium dioxide, ultrasonic dispersion is carried out, titanium dioxide is separated out, washing and drying are carried out, and treated titanium dioxide is obtained; the light stabilizer after drying is added into a banbury mixer together with the treated titanium dioxide and polyvinyl alcohol, banburying is carried out at 135-140 DEG C, and grinding is carried out. The anti-yellowing master batch prepared by the application has small influence on the anti-yellowing performance and melt flow performance of the anti-yellowing master batch by the anti-ultraviolet additive and the thermal oxidation stabilizer, and the polyurethane elastic fiber prepared from the anti-yellowing master batch has good mechanical properties and oil resistance.