246results about How to "Good fluorescence" patented technology

A method and apparatus for enhancing the optical detection of target portions of an object particularly useful in the optical examination of biological tissue to distinguish cancerous tissue from non-cancerous tissue. This is accomplished by exposing the object, e.g., biological tissue, to first and second light sources of different spectral contents for short, alternating, first and second time periods; detecting the light received from the object during each of the first and second time periods; and utilizing the light detected in the first and second time periods for producing and displaying a composite image including the image of the object and an enhanced image of the target portions, e.g., the cancerous tissue, overlayed on the image of the object.

The invention discloses a nitrogen-doped fluorescent carbon quantum dot, and a preparation method and an application thereof. The preparation method comprises the following steps: phenylenediamine isadded to ethanol, and is dissolved to obtain an ethanol solution of phenylenediamine, the ethanol solution of phenylenediamine is transferred into a polytetrafluoroethylene stainless steel autoclave,the autoclave is placed in an oven, the solution is heated and reacted, the obtained reaction product is centrifuged, the obtained supernatant is taken, and is filtered by a filter membrane, ethanol is removed from the treated product, the obtained product is dispersed in an appropriate amount of distilled water, and the obtained solution is freeze-dried to obtain a fluorescent carbon quantum dotpowder. The method has the advantages of simplicity in operation, low price and good repeatability; and the prepared nitrogen-doped fluorescent quantum dot has the advantages of high light stability,good water solubility, good selectivity, and realization of sensitive and specific detection and analysis of nitrites.

A retroreflective graphic article bearing a fluorescent legend comprising a retroreflective base sheet, an image layer containing one or more pigments and one or more fluorescent dyes and a dye-receiving layer containing fluorescent dye which migrated from the image layer. Also, a method for making such articles is provided.

The invention discloses a making method of liquid phase nanometer cadmium sulfide hollow ball, which is characterized by the following: adopting inorganic cadmium salt compound and monomer sulfur powder in the soluble liquid system as raw material; blending cadmium source solution and sulfur source solution directly or placing in the seal reactor to heat under certain temperature; synthesizing the product within one step; avoiding silica or small macromolecular ball or surface activator as mould; simplifying equipment and operation with cheap raw material; fitting for marking biology; possessing potential value in the nanometer material synthetic or other relative scientific domains.

The invention belongs to the technical field of food, and more specifically relates to a color/fluorescence double signal visible rapid nitrite detection method, and applications thereof. The color/fluorescence double signal visible rapid nitrite detection method comprises following steps: firstly, a carbon dot-neutral red composite system is prepared, wherein carbon dot synthesis and constructionof the carbon dot-neutral red composite system are carried out; a common filter paper is immersed in the carbon dot-neutral red composite system so as to obtain a carbon dot-neutral red composite system detection test paper; a sodium nitrite standard solution is prepared; a color standard colourimetric card and a fluorescence standard colourimetric card of nitrites are prepared; a software is adopted to extract the RGB values of each test paper, a matrix is constructed, and a multivariate linear regression model is constructed; and the content of nitrites in food to be detected is detected. The carbon dot-neutral red composite system possess color/fluorescence double response capacity on nitrites; detection operation steps are simple; the visible results are clear, visual, and accurate; the detection limit is lower; and it is promising for the color/fluorescence double signal visible rapid nitrite detection method to be used in large-scale food nitrite content detection.

The invention discloses a preparation method of water-soluble fluorescent carbon quantum dots based on eggshell membranes and application of the carbon quantum dots in preparation of a nanogold and carbon quantum dot composite nanomaterial. The method particularly comprises the following steps that the eggshell membranes are stripped, cleaned and dried; a certain quantity of the eggshell membranes are dispersed in an alkaline solution, the dispersed solution is transferred into a hydrothermal synthesis kettle, and reacting is conducted under the condition of 150 DEG C to 210 DEG C for 6 h to 18 h; centrifugal dialysis treatment is conducted, a carbon quantum dot solution is obtained, the carbon quantum dot solution is mixed with a chloroauric acid solution, temperature-controlled reacting is conducted for a period of time, and the nanogold and carbon quantum dot composite nanomaterial with good dispersity is obtained. According to the preparation method and application of the water-soluble carbon quantum dots based on the eggshell membranes, the raw materials for synthesizing the carbon quantum dots are low in price and easy to obtain, the method is simple, the product is good in water solubility and can be used as a reducing agent of gold nanoparticles, and usage of an external toxic reducing agent is avoided. The prepared carbon quantum dots and nanogold and carbon quantum dot composite nanomaterial can be applied in the fields of sensing detection, bioimaging and catalytic conversion.

The invention relates to a new method for preparing a graphene quantum dot from asphalt, coke and other asphalt materials through oxidation and post-treatment process, and belongs to the technical field of nano-material preparation.

The invention provides two 1,8-naphthalimide derivatives which respectively have structures of a formula (I) and a formula (II). The 1,8-naphthalimide derivatives which have structures of the formula (I) and the formula (II) respectively contain two and three 1,8-naphthalimide groups. The experiment shows that fluorescence-emission strengths of the derivatives corresponding to the maximum emission wavelength are respectively 1.6 times and 1.9 times as much as the EBNP (4-amino-ethylamino-N-n-butyl-1,8-naphthalimide); and the derivatives have high use rate of fluorogens and have higher fluorescent properties.

The invention belongs to the field of nano composite materials, and in particular relates to a preparation method for a modified carbon quantum dot/silicone rubber fluorescent composite material. Thepreparation method comprises the following steps: (1) preparation of carbon quantum dots: preparing a carbon quantum dot ethanol solution by taking a water soluble starch solution as a carbon source;(2) preparation of modified carbon quantum dots: modifying the carbon quantum dots with a silane coupling agent KH570; and (3) preparation of the modified carbon quantum dot/silicone rubber fluorescent composite material: preparing the modified carbon quantum dot/silicone rubber fluorescent composite material from base rubber I, base rubber II, hydrogen-containing silicone oil, a solvent and the modified carbon quantum dot ethanol solution as raw materials. By modifying the carbon quantum dots with the silane coupling agent KH570 and introducing the silane coupling agent to the surfaces of thecarbon quantum dots, the carbon quantum dots take part in a vulcanization reaction of silicone rubber, so that the carbon quantum dots are uniformly dispersed in the silicone rubber to obtain the carbon quantum dot/silicone rubber fluorescent composite material with a good fluorescent effect, and therefore, the application of the silicone rubber in the fields with fluorescent demands is expanded.

The invention discloses a multifunctional fabric which is formed by blended knitting of the following components in percentage by weight: 13-17 percent of fully-drawn nylon yarn fiber attached with organic fluorescent substances, 19-23 percent of polyester drawn textured yarn fiber attached with organic fluorescent substances, 23-36 percent of spun silk fiber and 32-37 percent of tencel fiber. Since being formed by blended knitting of the four material fiber including the fully-drawn nylon yarn fiber attached with organic fluorescent substances, the polyester drawn textured yarn fiber attached with organic fluorescent substances, the spun silk fiber and the tencel fiber, the fabric is good in fluorescent effect, thin and soft, light in weight, and comfortable and smooth and has good moisture absorption performance and air permeability.

The invention provides fluorescent silicon dioxide nanospheres prepared at normal temperature and normal pressure by attempting to use a method of combining a dye with a silane coupling agent and then carrying out copolycondensation together with ethyl orthosilicate for the first time. According to the invention, the production method is simple, the cost is low and the reaction rate is high; and the fluorescent silicon dioxide nanospheres prepared by the invention have the advantages of uniform morphology and adjustable particle size and fluorescence intensity. The size of the obtained fluorescent silicon nanospheres is about 50-80 nm. The application of silicon dioxide nanomaterials in the fields of chemical synthesis, biological medicine, electronics, optics and other fields attracts wide attention. Because of non-toxicity, biocompatibility and easiness for introduction of fluorescent dyes, the silicon dioxide nanospheres become good biological fluorescent nanoparticles and can be widely used in biomedical imaging and immunoassays.

The invention relates to a method for preparing fluorescent silver nano-clusters. The method mainly solves the problems that in an existing method for preparing fluorescent silver nano materials, preparation processes are complex, production cost is high, and needed reagents are prone to producing toxic effects on the environment. The method comprises the following steps that firstly, a certain amount of silver salt and a certain amount of sodium oleate are respectively dispersed in solvent water; secondly, the two solutions are mixed and stirred for a certain period of time and then placed on a constant temperature magnetic stirrer to be heated for a certain period of time after becoming even; thirdly, the reacted solutions are filtered, solid matter is removed, and the fluorescent silver nano-clusters are obtained. The fluorescent silver nano-clusters prepared with the method have good dispersity; besides, the method is simple, low in cost and environmentally friendly, and is a scientific method for preparing the fluorescent silver nano materials at low cost. The method is applied to the chemical engineering field.

The invention provides a red light enhanced core-shell upconversion luminescent nano-carrier and a preparation method therefor. The material has the chemical expression of NaGdF4:Yb,Er,Mn@NaGdF4:Yb@gel, wherein @ represents coating, and gel represents gelatin. The material provided by the invention is technically characterized in that homogeneous and monodisperse nanocrystals are produced by adopting a high-temperature pyrolysis method, which is environment-friendly and is easy and feasible in operation, and hydrophobic surfaces of nanoparticles are coated with gelatin by adopting a self-assembly method, so as to form NaGdF4:Yb,Er,Mn@NaGdF4:Yb@gel, of which the surface is hydrophilic and has a large number of active groups. The nano composite material prepared by the scheme has a red light enhanced luminescence property, maintains relatively strong luminescence total intensity and has a hydrophilic surface with a large number of active groups. The nano-carrier has enhanced red light emission and relatively strong fluorescence intensity and meanwhile has a hydrophilic active surface, thereby being capable of serving as an excellent photosensitizer carrier.

The invention disclose a process for preparing orientation arrangement zinc sulfide and zinc oxide nanometer cable composite material by utilizing chemical solution method for preparing nano rod orientation arrangement zinc oxide nano material first, then vulcanizing the zinc oxide crystal arrangement which comprises, dissolving the thioacetamide in deionized water, agitating till the solution is clarified, immersing the pre-prepared zinc oxide film in nano rod arrangement into reaction liquid, elevating temperature to 130 deg. C, reacting 11-12 hours. The jacketing of the composite material is formed by zinc sulfide nanocrystalline, and the cable inner core is formed by non-reacted zinc sulfide nanocrystalline.

The invention discloses a synthesis method of a rare earth/Schiff base SBA-15 mesoporous composite luminescent material, which comprises the following steps: dissolving N,N'-bis salicylaldehyde ethylenediamine in anhydrous ethanol, adding a silane coupling agent triethoxysilylpropyl isocyanate, reacting in a N2 protective atmosphere for 12 hours, and separating and purifying the reaction solution with a rotary evaporator to obtain a hybrid material precursor; mixing a template agent P123, 2M HCl and deionized water, adding the obtained hybrid material precursor and ethyl orthosilicate after the P123 is completely dissolved, stirring to react at 35 DEG C for 24 hours, crystallizing at 100 DEG C for 48 hours, filtering, washing, removing the template agent P123, dissolving the obtained Schiff-base-functionalized SBA-15 mesoporous material in anhydrous ethanol, adding a rare earth nitrate ethanol solution, reacting at 80 DEG C for 12 hours, filtering the reaction solution, and drying to obtain the rare earth/Schiff base SBA-15 mesoporous composite luminescent material.

The invention discloses a preparation method for a fluorescent nano-cellulose compound aerogel. The preparation method comprises the following steps: taking a cotton linter as a raw material for extracting cellulose nano-fiber; utilizing a TEMPO process to prepare the cellulose nano-fiber with carboxyl on the surface; utilizing a hydro-thermal synthesis process to prepare a carbon quantum dot withamino-functionalized surface; freeze-drying the cellulose nano-fiber, thereby preparing an aerogel; adding the prepared aerogel into an amino-carbon quantum dot solution; adopting a catalyst for catalyzing the chemical grafting of the carbon quantum dot on the surface of the cellulose nano-fiber; and freeze-drying, thereby acquiring a compound fluorescent aerogel material. According to the preparation method disclosed by the invention, the defects of toxicity caused by inorganic compound serving as an aerogel skeleton, discontinuous fluorescence effect of simple physical doping of fluorescentsubstances, and the like, can be overcome; the preparation method is low in cost and is environment-friendly, green and nontoxic; the product has excellent mechanical property and fluorescence effect; the grafting of the carbon quantum dot on the surface of the aerogel material in the form of covalent bond can be realized.

Excitation light of a selected wavelength from an excitation monochromator is directed along the long axis of a flow cell containing the sample to be analyzed, generating fluorescence. An emission monochromator is positioned at right angles to the plane of the excitation monochromator and receives the fluorescence from the flow cell utilizing optical components positioned such that the entrance slit of the emission monochromator is aligned with the long axis of the emission window. The intensity of the output from the flow cell is further maximized by positioning a retro-reflecting mirror at the end of the flow channel to effectively double the path-length of the excitation beam, and a reflecting surface on the side of the cell opposite the emission window to increase the collection efficiency and thereby increase the sensitivity of the detector.

The invention provides a fluoro-substituted 9, 9'-spirobifluorene blue-light host material, its preparation method and application. Structurally, the fluoro-substituted 9, 9'-spirobifluorene blue-light host material contains a 9, 9'-spirobifluorene central core, the periphery of which is modified by different fluoro-substituted (or trifluoromethyl substituted) phenyl groups. By changing the position and the number of peripheral strong electron withdrawing group fluorine or trifluoromethyl, adjusting the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of the material, the charge transmission capability, photophysical properties and thermal properties, and making its emission spectrum and a doped object's absorption spectrum well overlapped, the material can effectively absorb energy and transfer the energy to the object, thus causing luminescence of the object and improving device's performance. With good thermal stability and luminescent properties, the material is easy to synthesize and is convenient to purify, and can be widely used in the fields of organic field effect transistors, organic electroluminescent devices, organic laser and organic photovoltaic solar cells, etc.

The invention provides multifunctional vinyl acetate decorative coating for an interior wall. The multifunctional vinyl acetate decorative coating is prepared from the following components in parts byweight: 50 to 80 parts of a vinyl acetate emulsion, 5 to 10 parts of fluorescent powder, 1 to 3 parts of a negative ion additive, 3 to 6 parts of nano silicon dioxide, 8 to 12 parts of nano titaniumdioxide, 10 to 20 parts of diatomite, 5 to 10 parts of mica powder, 3 to 6 parts of titanium white, 10 to 20 parts of calcium carbonate, 4 to 8 parts of a 20% hydroxyethyl cellulose solution, 0.3 to 0.5 part of a fungicide, 0.5 to 0.8 part of a mildew preventive, 0.1 to 0.3 part of a pH regulator, 0.5 to 1.0 part of a dispersant, 0.2 to 0.5 part of a de-foaming agent, 1.0 to 2.5 parts of a film forming auxiliary agent, 0.5 to 0.8 part of a thickener, 1 to 3 parts of an anti-freezing agent and 20 to 50 parts of de-ionized water. The coating provided by the invention has good scrubbing resistance, weather resistance, contamination resistance and ageing resistance and can be used for statically and continuously releasing negative ions and removing harmful gas including formaldehyde, ammonia,benzene and the like; and the coating has the advantages of bacterium resistance and bacterium inhibition, no pollution, environment protection, high decoration performance, fluorescent performance, multifunction and the like.

The invention relates to a magnetic fluorescent coding microsphere and a preparation method thereof. Firstly, during magnetic particle synthesis, medium-chain and short-chain fatty acids are used formodifying the surfaces of magnetic nanoparticles, so that the polarity of the surfaces of the magnetic nanoparticles is increased, the magnetic nanoparticles can be uniformly dispersed in a good solvent, and the particle size is more uniform; then, a two-step swelling method is adopted, which comprises the following steps: firstly, enabling magnetic nanoparticles to enter swelled polymer microspheres; enabling the fluorescent dye to enter the swollen polymer microspheres to form a 'magnetic particle core-fluorescent shell layer' structure, and reducing quenching and shielding effects of the magnetic particles on fluorescence to the greatest extent; then, by utilizing the swelling fading effect of the microspheres in a poor solvent, sealing cracks generated on the surfaces of the microspheres due to the swelling effect, avoiding leakage of magnetic nanoparticles and fluorescent dyes, greatly simplifying the sealing process, and obtaining the magnetic fluorescent coding microspheres withgood microsphere particle uniformity, good magnetic performance and good fluorescent performance.

The invention relates to a fluorescent polyurethane emulsion, in particular to a fluorescent polyurethane emulsion based on a diketopyrrolopyrrole derivative. The fluorescent polyurethane emulsion has higher fluorescence intensity and higher molecular weight, and further, the fluorescence effect after film forming is better. The fluorescent polyurethane emulsion is more expected to be applied to the fields of anti-counterfeit marking, medical treatment, fluorescent paint and the like.