39results about How to "Obvious absorption peak" patented technology

The invention relates to barium magnesium niobate light-emitting ceramics and a preparation method thereof.The formula of the barium magnesium niobate light-emitting ceramics is Ba(1-x)Smx(Sn0.1Mg0.3Mg0.3Nb0.6)O3, wherein 0.005< / =x< / =0.03.The preparation method includes the steps of firstly, performing ball milling on a barium-source compound, a samarium-source compound, a magnesium-source compound, a tin-source compound and a niobium-source compound according to the weight requirements of the formula, then sintering under 1300-1350 DEG C to obtain products, and performing secondary ball milling on the products to obtain ceramic powder; secondly, adding a polyvinyl alcohol aqueous solution into the ceramic powder for pelleting, aging, crushing to obtain ceramic particles, forming the ceramic particles to obtain ceramic bodies, and preparing the ceramic bodies into even-pressure ceramic bodies through isostatic cool pressing; thirdly, sintering the even-pressure ceramic bodies under oxygen atmosphere after the even-pressure ceramic bodies discharge glue, cooling along with a furnace, and coarsely polishing and finely polishing to obtain the barium magnesium niobate light-emitting ceramics, wherein sintering temperature is 1500-1600 DEG C, and the temperature is kept for 48-60 hours.The barium magnesium niobate light-emitting ceramics have the advantages that the crystal boundary of the ceramics has no impurity phases, and the ceramics are good in compactness, even in grain size, high in chemical stability, and good in physical performances such as compressive strength; the ceramics have evident absorption peak in the visible light range, the quenching concentration can reach 2%mol, and high light-emitting intensity is achieved.

The invention relates to a preparation method of a carbon nanotube / paraffin microcapsule with light absorption performance. The preparation method comprises the following steps: first acidifying and grafting a carbon nanotube to obtain a polyhydroxy carbon nanotube; nitrifying and reducing tetraphenylporphyrin to obtain amino porphyrin; secondly, placing the polyhydroxy carbon nanotube in a round-bottom flask with distilled water, ultrasonically dispersing, and adding melamine, urea and a formaldehyde solution into the system to prepare a prepolymer; then adding the amino porphyrin into molten paraffin, ultrasonically dispersing, adding an emulsifier and distilled water, and preparing an emulsion; and finally mixing the prepolymer, the emulsion, sodium chloride, glacial acetic acid and a curing agent, and reacting to obtain the microcapsule. The phase change potential heat is increased, and the carbon nanotube is uniformly dispersed in the compound paraffin to increase the heat conductivity, so that the stability of the emulsion is improved; the heat conducting performance of a wall material is improved, and the heat storage and release efficiency of the microcapsule is improved; and meanwhile, the microcapsule has an obvious absorption peak in a visible light zone, and has a photosensitive property.

The present invention relates to the preparation and application of a solid-state fluorescent probe for detecting carbon monoxide (CO). The structural formula of the fluorescent probe is: Dihydroquinazoline)-4-hydroxybenzaldehyde, 1-ethyl-2-methylquinoline, allyl chloroformate, etc. are the preparation method for synthesizing the solid-state fluorescent probe as raw materials; first, the solid-state fluorescent The probe has a long wavelength, emits strong fluorescence at 650nm, is insoluble in water and has anti-diffusion ability; secondly, the fluorescent probe shows high sensitivity to CO, and the fluorescence of the probe is significantly enhanced after the reaction of the probe with CO; and , the solid-state fluorescent probe exhibits high selectivity to CO, and is not interfered by other reactive oxygen species, reactive nitrogen species, reactive sulfur, biothiols, and common ions; in addition, the solid-state fluorescent probe reacts rapidly with CO and responds The time is within 100s; finally, the solid-state fluorescent probe is applied to the detection of carbon monoxide content in living cells, and can perform fluorescence imaging of CO.

The invention discloses a preparation method of a polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles, comprising the following steps: (1) preparing a polyvinyl alcohol-silver nitrate solution; (2)preparing a polyvinyl alcohol-silver nitrate film by using spin coating method or casting film method; and (3) irradiating the polyvinyl alcohol-silver nitrate film with ultraviolet light. The prepared composite film has the characteristics of uniform metal nanoparticle size distribution, controllable dimension, uniform shape, and uniform dispersion.

Disclosed are a metallic silver filled photonic crystal optical fiber capable of spontaneously generating SPR effect and a preparation method thereof, and belongs to the technical field of optical fiber intelligent communication. The optical fiber comprises a fiber core and a cladding, the fiber core is a solid quartz glass rod, the cladding comprises a quartz glass capillary tube, an air hole, and a silver wire, a multilayer quartz glass capillary tubes are arranged around the longitudinal direction of the fiber core, and a silver wire is arranged at the air hole of one quartz glass capillarytube in the second layer quartz glass capillary tube. The preparation method is as follows: according to the design structure, the arrangement structure, and the drawing optical fiber, the prepared optical fiber can spontaneously generate the SPR effect. The method can prepare the photonic crystal optical fiber capable of spontaneously generating SPR effect of different air hole structures and sizes, no need to subsequently coat or fill the optical fiber, and the resonance peak position can be adjusted by adjusting the diameter of the air hole, filling the diameter of the silver wire and theouter diameter of the capillary tube, the performance is good, meanwhile the method has the advantages of simple structure, convenience in preparation, adjustable adjustment and the like, and can be applied to the manufacturing of various optical components.

The invention discloses a method for rapidly hydrothermally preparing a tetragonal copper bismuthate photocatalyst. The method comprises the following steps: respectively preparing an acetic acid solution of bismuth nitrate pentahydrate and an ethanol solution of copper nitrate trihydrate, and then mixing the two under stirring. , and then dropwise add lye to the solution to pH=14, transfer the above mixed solution to a high pressure reactor at 90-150 ℃ for hydrothermal reaction, and then carry out centrifugal washing and vacuum drying on the obtained product to obtain the morphology of Dumbbell-shaped tetragonal copper bismuthate powder. The preparation process is simple, the reaction temperature is lower than the traditional hydrothermal method, and the preparation time is short, the synthesized powder has good crystallinity, high purity, controllable grain size, relatively uniform size, and good visible light response performance, at 650-700nm There is an obvious absorption peak at , and the methylene blue solution is degraded synergistically with H2O2 under visible light, and the degradation efficiency can reach 90% to 100% within 30 minutes.

The invention mainly aims to provide a compound selectively recognizing mercury ions and a preparation method and application thereof. The preparation method includes following steps: 1), providing a first solution which contains a rhodamine compound dispersed in a first solvent; 2), heating the first solution, and mixing the first solution with a hydrazine hydrate solution for reaction to obtain rhodamine hydrazide; 3), providing a second solution which contains rhodamine hydrazide dispersed in a second solvent; 4), heating the second solution, mixing the second solution with a Lawson reagent, reacting in an inertial gas atmosphere, and separating out sulfur hydrazide; 5), providing a third solution which contains sulfur hydrazide dispersed in a third solvent; 6), heating the third solution, mixing the third solution with terephthalaldehyde, reacting under catalysis of glacial acetic acid and in inertial gas, and filtering to obtain a product. The synthesis process is free of byproduct generation, and the compound is simple in purifying operation and has good selective recognition effect on Hg2+.