169results about How to "Excellent fluorescence properties" patented technology

The invention discloses application of fluorescent silica nanoparticles as an anti-fake mark. The fluorescent silica nanoparticles are prepared from a silicon source, and the obtained fluorescent silica nanoparticles are used for preparing anti-fake patterns by using anti-fake ink. The fluorescent silica nanoparticles are excellent in luminescent property, high in quantum yield and good in storage stability, and have good excitation wavelength dependency; the prepared anti-fake patterns can display light of different colors under the illumination of different laser wavelengths, and can achieve a good anti-fake effect.

The invention relates to a preparing method for a probe molecule which identifies tumor cells specifically, belonging to the nanometer material and biology technical field; the method comprises the following steps: (1) biocompatible folate is used for modifying PEG with the two sides being amino groups; (2) the PEG connected with the folate is modified to the surface of dendrimer PAMAM; (3) oil-soluble ligand on the surface of a quantum dot is replaced by a ligand exchange method, thus preparing a water-soluble quantum dot; the invention can lead the quantum dot to identify cancer cells expressed with high-level folate receptors, thus being capable of being used as a fluorescent probe used for the study of cytology; at the same time, the PAMAM and the PEG are modified to the surface of the quantum dot, thus improving the stability of the quantum dot greatly; furthermore, the PAMAM and the PEG have good biocompatibility and little toxicity, thus providing feasibility for the application thereof in the biology.

The invention provides a preparation method of a quaternary ammonium salinized fluorescent carbon dot and application of the quaternary ammonium salinized fluorescent carbon dot in bacterium resisting and gram positive bacterium and gram negative bacterium differentiating. The preparation method of the quaternary ammonium salinized fluorescent carbon dot mainly comprises the two steps that a surface-aminated carbon dot is prepared, and then alkyl betaine is grafted to the surface of the aminated carbon dot to obtain the quaternary ammonium salinized carbon dot. The prepared quaternary ammonium salinized carbon dot has the good water solution dispersibility and the low cytotoxicity and can effectively inhibit and kill gram positive bacteria. In addition, the quaternary ammonium salinized carbon dot has the good fluorescent property and can selectively enable the gram positive bacteria to be imaged to effectively differentiate the gram positive bacteria and gram negative bacteria.

The invention discloses an infrared nonlinear optical crystal and a preparation method and application thereof. The infrared nonlinear optical crystal has a molecular formula shown as A18X21Y6M48, wherein A is Ba, Sr or Pb; X is Zn, Cd or Mn; Y is Ga, In or Al; and M is S, Se or Te. The crystal belongs to a trigonal crystal system, and the space group is R3. Crystal Ba18Zn21Ga6S48 is a type-I phase matching nonlinear optical material, the particle size is in a range of 150-210 mu m, the frequency multiplication intensity and the laser-induced damage threshold of the powder are respectively 0.5 time and 28 times of that of commercial material AgGaS2, others crystals have a same or similar crystal structure and optical and other properties, have important military and civil application prospects, and can be used for optoelectrionic countermeasures, resource probing, space anti missile, communication and the like.

An in-situ preparation-based method for detecting the concentration of glucose by use of fluorescent Ag nano-clusters belongs to the technical field of fluorescent Ag nano-clusters. In the presence of O2, glucose oxidase (GOx) catalyzes and oxidizes glucose to generate H2O2, a free radical produced by 'Fenton Reaction' between H2O2 and Fe<2+> is used for arousing methacrylic acid (MAA) polymerization, the polymerization product polymethyl acrylic acid (PMAA) serves as a stabilizer to prepare fluorescent Ag nano-clusters (Ag NCs) through ultraviolet light reduction method, and the fluorescent emission intensity of the acquired nano-clusters and the concentration of glucose are utilized to build a quantitative relationship, so that the glucose concentration detection can be realized. The prepared Ag NCs is uniform in particle diameter and less than 2 nm in size and has excellent orange fluorescent emission. The method for glucose detection is a fluorescent 'turn-on' process, and the optimal glucose detection condition can be obtained through optimization of the preparation condition.

The invention provides a benzofuran [2,3-b] pyrazine derivative as well as application thereof in an organic electric fluorescent device. The chemical structural formula of the benzofuran [2,3-b] pyrazine derivative is as shown in the specification. In the formula, A is carbazole at different sites and a derivative of carbazole, triphenylamine at different sites and a derivative of triphenylamine, spirofluorene closed loop triphenylamine at different sites and a derivative of spirofluorene closed loop triphenylamine, spirofluorene at different sites and a derivative of spirofluorene, or acridine at different sites and a derivative of acridine. The benzofuran [2,3-b] pyrazine derivative provided by the invention can be used as a light emitting body to prepare the organic electric fluorescent device, an efficient electroluminescence property can be achieved, the maximum light emitting efficiency can be up to 11.5 Cantera per ampere, and the external quantum efficiency is up to 4.44%, which is approximate to the theoretical boundary value of 5% of a fluorescent material as the light emitting body in the organic electric fluorescent device.

The invention provides a method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as a carbon source. The method comprises the following steps: 1) cleaning, slicing, baking and grinding fresh kelp, and sieving to obtain powder; 2) weighing and dispersing a certain amount of kelp powder in ethanol, stirring to obtain paste, putting the paste in an autoclave, and reacting for a period of time at high temperature; and 3) dispersing the product in ethanol, carrying out suction filtration, solvent rotary evaporation, and centrifugal separation to obtain precipitates, and freeze-drying the precipitates to obtain the carbon nanodots. The method provided by the invention is simple in operation, the cost is low, and the raw materials are easy to obtain; and the prepared carbon nanodots have excellent fluorescent properties and good biocompatibility and are expected to be widely applied to important fields, such as chemical sensing, biological analysis, environmental monitoring, photocatalysis, biological imaging and photoelectric conversion.

The invention provides a preparation method for a carbon quantum dot fluorescent probe. The preparation method is characterized by comprising the following steps: heating citric acid and quadrol for reaction, dissolving an acquired mixture into water and then putting into a dialysis bag for dialysis, thereby acquiring the carbon quantum dot fluorescent probe. According to the invention, a one-stepmethod is adopted for successfully preparing an environment-friendly, simple and easily acquired carbon quantum dot served as a fluorescent probe; selectivity and fluorescence characteristic of the carbon quantum dot fluorescent probe are combined for recognizing Fe (III); the carbon quantum dot prepared according to the method has the advantages of green, non-toxicity, simple detection method, high selectivity, and the like; a complex modifying process is avoided.

The invention discloses a method for mass production of water-soluble fluorescent carbon nanoparticles, which comprises the following steps: adding activated carbon, which is used as a carbon source, into an oxidant water solution, and stirring the mixed solution by a magnetic stirrer to obtain a black suspension; treating the suspension with ultrasonic in a 300W ultrasonic cleaning apparatus under the frequency of 40KHz for 2-4 hours; after the ultrasonic reaction finishes, carrying out vacuum filtration on the suspension to obtain a brownish black filtrate; and drying the filtrate by distillation at 60-70 DEG C, and dissolving the obtained black solid in deionized water at room temperature to obtain the purified water-soluble carbon nanoparticles. In the method disclosed by the invention, the water-soluble carbon nanoparticles, which can emit fluorescence from the visible light region to the near-infrared light region and has upconversion fluorescence property and other excellent optical properties, are synthesized under the action of the ultrasonic and strong oxidant. The method disclosed by the invention is simple and easy to implement, and has the advantages of low price, accessible raw materials and environmental protection.

The invention provides a preparation method of green fluorescent powder made of a one-dimensional nano-structure material of lanthanum phosphate activated by cerium and terbium. The preparation method comprises the following steps of: respectively preparing salt solutions of La<3+>, Ce<3+> and Tb<3+> and a PO4<3-> salt solution, mixing the salt solutions of the La<3+>, the Ce<3+> and the Tb<3+> according to a certain molar ratio, and then mixing with the PO4<3-> salt solution to prepare a mixed solution; regulating the pH value of the mixed solution to 0.5-8; stirring the mixed solution for 0.3-2 hours; and aging the mixed solution in a water bath at room temperature or the temperature of 7 DEG C-95 DEG C for more than one hour under environmental pressure so as to prepare the nanowires of the lanthanum phosphate activated by the cerium and the terbium, namely (La, Ce, Tb)PO4. The preparation method can be implemented by adopting simple and cheap equipment under the environmental pressure, so that production cost can be greatly reduced and industrial production is easy to realize; and adding of a template agent is not required during the preparation process, and environmental effects which are possibly caused by waste liquid are avoided. According to the preparation method disclosed by the invention, the nanowires of the green fluorescent powder of the (La, Ce, Tb)PO4 can be synthesized by water phase/low temperature/normal pressure, the particle size is uniform, the method is simple and convenient, and the energy consumption is low.

The invention provides a method for developing fingerprint on skin by using Fe3O4/SiO2@Gd2O3:Eu,Bi materials. The method comprises the following steps: utilizing both good magnetism and strong fluorescence properties of Fe3O4/SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials of a core-shell structure, brushing on a fingerprint which is transferred on the surface of a glass sheet, by a fingerprint brush tip, combining the fingerprint, and developing the fingerprint texture under irradiation of ultraviolet light. The method can be used for overcoming the defect that the magnetic powder method has low sensitivity of developing the fingerprint on the skin, improves the developing success rate of the fingerprint on the skin, is clear for the developed fingerprint on the skin, obvious for contours; and the developing method is simple, and easy to implement, and the Fe3O4/SiO2@Gd2O3:Eu,Bi magnetic-fluorescence nano materials have stable properties, are easy to store, consumes less, and can be used for greatly improving the developing efficiency of the fingerprint on the skin.

The present invention relates to chemical technology, and discloses environment friendly process and system for synthesizing nanometer fluorescent semiconductor CdTe crystal material. The synthesis process includes the following steps: preparing Te source, preparing Cd source, mixing the Te source and the Cd source at normal temperature to obtain water solution of CdTe crystal nucleus, adding initiator hydrazine hydrate to initiate CdTe crystal growth and monitoring the growth state with one optical fiber spectroscope, adding terminator n-hexanol to terminate growth after the CdTe crystal reaches its target value, and centrifuging in a high speed centrifuge to eliminate supernatant and obtain CdTe crystal solution. The synthesis system consists of one synthesis unit, one ultraviolet lamp, one detector, one small optical fiber spectroscope and one computer with special software.

The invention relates to a fluorescent compound with A beta plaque affinity as shown in the general formula (I) and a composition containing the derivative. The substituent group in the general formula is a composition as shown in the specification. The invention further relates to a preparation method of the fluorescent compound and application of the fluorescent compound in imaging of A beta plaque.

The invention discloses a gold nanorod/silicon dioxide/carbon point nanometer hybrid material. The nanometer hybrid material comprises a gold nanorod as a core, a silicon dioxide layer as a shell, and carbon points distributed on the outer surface of the silicon dioxide layer; and the nanometer hybrid material is obtained by a coupling effect between the silicon dioxide layer coating the outer surface of the gold nanorod and silane functional carbon points containing amido. The invention further discloses a preparation method of the gold nanorod/silicon dioxide/carbon point nanometer hybrid material. The preparation method of the gold nanorod/silicon dioxide/carbon point nanometer hybrid material is simple and controllable. The gold nanorod/silicon dioxide/carbon point nanometer hybrid material realizes application to diffuse reflection imaging through the gold nanorod, realizes application to fluorescent life imaging through the carbon points, realizes non-intrusive multi-mode imaging, and is excellent in application prospect in the cancer diagnosis.

The invention belongs to the field of material preparation, and mainly relates to lanthanum-series porous coordination polymers based on C2v symmetrical ligands, and a synthesis method and an application thereof. A series of fluorescent porous coordination polymers based on the C2v symmetrical ligands with gradually increased conjugacy are designed and synthesized, and the synthesis method is simple, convenient and easy to implement. The prepared novel lanthanum-series porous coordination polymers have good fluorescent properties; by adjusting the ligands and lanthanide elements, chrominance between pink and blue light can be adjusted; based on relatively high quenching coefficient, the polymers can be used for molecular recognition. Single crystal X-ray diffraction reveals that the pore size and the pore volume are controlled by the system, and the prepared porous coordination polymers have potential applications in highly-effective adsorption and release of iodine.

The invention discloses a carbon dot component in cola as well as a property characterization method and a practical application method of the carbon dot. The preparation method comprises the following steps: by taking original-taste (1+2) Nestle coffee, pepsi (330ml) and coca-cola (330ml) as main raw materials, separating and purifying through a dextrane gel G-25 column and performing freeze-drying for 24 hours to collect the carbon dot. The coffee/cola carbon dot is relatively low in cost, low in toxicity, simple in extracting method, good in water solubility, good in biocompatibility and can be widely used as a novel fluorescent carbon nano particle in the field of biomarkers.

The invention belongs to the field of fluorescent protein materials in biotechnology, and specifically relates to a method for preparing an allophycocyanin tripolymer fluorescent protein. The method comprises the following steps: firstly, cloning allophycocyanin alpha sub-gene apoprotein genes and phycobilin biosynthesis enzyme genes hol and pcyA into an expression vector; and secondly, cloning allophycocyanin beta sub-gene apoprotein genes and chromophore lyase genes cpcS and cpcU into another vector, using the two expression vectors to simultaneously transform Escherichia coli, and screening out an engineering bacterium simultaneously expressing the genes, thus obtaining the allophycocyanin tripolymer fluorescent protein. By using the Escherichia coli as the raw material instead of algae to produce the recombinant photo-activated protein, the Escherichia coli is easy to culture and grows fast, thereby greatly shortening the production cycle. Compared with algae, the cell wall of the Escherichia coli can be broken easily, energy can be saved in the purification process, and a high utilization rate can be achieved.

The invention belongs to the field of nano material manufacturing, and relates to a method for preparing carbon dots by using a microwave-assisted method and application, in particular to a preparation method of fluorescent carbon dots and application of the fluorescent carbon dots in cell imaging. The cell activity can be detected, normal cells can be distinguished from cancer cells and cell membranes can be targeted specific to liver cancer cells. According to the method, citric acid, triethylenetetramine and fluorescein are used as raw materials, ethyl alcohol is used as a solvent, DMSO isused as a cosolvent, a reaction is performed for 2-8 hours at the temperature of 100-140 DEG C by utilizing the microwave-assisted method, and the fluorescent carbon dots are obtained through dialysisand rotary evaporation. The method is easy to operate, easily available in raw materials, green and environment-friendly. The carbon dots prepared by the method can be simultaneously used for detecting cell activity in cells, distinguishing normal cells from cancer cells and targeting cell membranes specific to liver cancer cells. The potential application value is realized in the fields of biology, medical treatment and the like.