306 results about "Intense fluorescence" patented technology

Particle analyzing systems with fluorescence detection are disclosed, primarily in connection with particle sizing based on scattered light intensity or time-of-flight measurement. In one system, emission of fluorescence is used as a threshold for selecting particles for further analysis, e.g. mass spectrometry. In another embodiment, laser beams arranged sequentially along an aerosol path are selectively switched on and off, to increase the useful life of components, and diminish the potential for interference among several signals. Other embodiments advantageously employ color discrimination in aerodynamic particle sizing, single detectors positioned to sense both scattered and emitted fluorescent radiation, and laser beam amplitude or gain control to enhance the range of fluorescence detection.

The invention discloses nitrogen carbide quantum dot fluorescence ink. By virtue of a hydrothermal synthesis method, a colorless and transparent nitrogen solution with strong fluorescence characteristics is prepared, and nitrogen carbide quantum dots of the water solution are uniform in shape and controllable in size; a maximal fluorescence-emission peak can be detected at 368 nanometers by virtue of excitation of a 250-nanometer wavelength, and most emission peaks are projected to invisible regions; when the nitrogen carbide quantum dot fluorescence ink is applied to encrypted storage protection of fluorescence information, the encrypted information cannot be read by virtue of ultraviolet color development, and fluorescence signals can be converted into readable information by virtue of a specific instrument. Compared with a traditional method, the method has the advantages that read equipment is relatively specific, and the information encryption is relatively strong.

The invention discloses a method for preparing a water-soluble mercury ion fluorescence probe on the basis of rhodamine and application of the water-soluble mercury ion fluorescence probe. A structural formula of the Hg<2+> fluorescence probe are shown, and the water-soluble mercury ion fluorescence probe is synthesized from 1, 2, 4-trimellitic anhydride, 3-diethylamino phenol and hydrazine hydrate. The method and the application have the advantages that the water-soluble Hg<2+> fluorescence probe prepared by the aid of the method is simple in structure, is based on rhodamine derivatives and is the first fluorescence probe for detecting Hg<2+> in 100% aqueous solution by the aid of rhodamine lactam derivatives; ring opening of rhodamine lactam structures can be carried out under the induction effects of the Hg<2+> in systems, intense fluorescence can be generated, and the water-soluble mercury ion fluorescence probe is high in Hg<2+> detection sensitivity; the fluorescence probe is excellent in Hg<2+> selectivity and is almost free of interference of other positive ions; the Hg<2+> can be measured by the fluorescence probe without disturbance when pH (potential of hydrogen) values range from 5.0-8.0, the fluorescence probe and the Hg<2+> can act quickly, and the response time is shorter than 3 minutes; the probe further can be applied to measuring Hg<2+> in environmental water samples and carrying out fluorescence imaging on Hg<2+> in biological cells.

The invention pertains to the technical field of nanometer supramolecular materials, and relates to a nanometer supramolecular assembly of a perylene diimide derivate modified by full methylated Beta-cyclodextrin loaded by polyvinylidene fluoride membrane and a preparation method thereof. The chemical formula of the molecular assembly is C138H226N2O72, and the structure thereof is shown as in an attached drawing. The perylene diimide derivate modified by the red fully methylated Beta-cyclodextrin is dissolved to obtain the nanometer supramolecular assembly. The method adopts the strong fluorescence of solid perylene as a detecting singnal, takes an empty chamber of the fully methylated Beta-cyclodextrin as a receptor of an air molecule, thereby solving two difficulties of strong fluorescence in a solid state in the construction of a fluorescence sensor and the introduction of a suitable air molecular receptor. The nanometer supramolecular assembly of the perylene diimide derivate modified by full methylated Beta-cyclodextrin loaded by PVDF member realizes quick detection of the fluorescence sensing function of the air molecules of nitromethane, nitroethane and nitrobenzene in 10s.

The invention discloses a preparation method and applications of hexatomic dinitrogen heterocyclic derivatives containing four identical substituent groups, and belongs to the field of application technology of luminescent materials in preparation of organic light-emitting devices. According to the preparation method, pyrazine and pyridazine are taken as electron acceptors of luminescent materials; the periphery of the electron acceptors is connected with electron donors such as carbazole, phenoxazine, and 9,9-dimethyl-9,10-dihydracridine; frontal orbital overlapping degree of HOMO and LUMO is adjusted, so that luminescent materials with thermally activated delayed fluorescence (TADF) characteristics are obtained. At room temperature, the hexatomic dinitrogen heterocyclic derivatives possess strong absorption at ultraviolet-visible region, a dilute solution of the hexatomic dinitrogen heterocyclic derivatives is capable of emitting strong fluorescence, the wavelength of emission peaks ranges from 450 to 615nm in the blue light-orange light range, the hexatomic dinitrogen heterocyclic derivatives can be applied to organic light-emitting devices as luminescent materials. According to devices based on compound M2, turn-on voltage is 3.9V, the maximum brightness 3846cdm<2> is achieved at a voltage of 12V; and the maximum luminous efficiency 17.4cdA<1> and the maximum power efficiency 12.21mW<1> are achieved when electric current density is 0.06mAcm<2>(4.5V).

The invention provides a preparation method and application of a fluorescence-MRI (Magnetic Resonance Imaging) dual-mode image probe, and particularly relates to a dual-mode image probe which combines a fluorescent nanoparticle and a paramagnetic contrast agent and a preparation method thereof, belonging to the field of functional materials. The main process of the method comprises the following step of: removing residues and moisture through dialysis and freeze-drying by taking an amino compound as a surface passivation agent and a gadolinium-based complex as a carbon source material and adopting a one-step forming method to obtain a fluorescence-MRI dual-mode gadolinium-doped carbon quantum dot. The method provided by the invention ahs the characteristics of simple process, low cost and easiness for large-scale production. The fluorescence-MRI dual-mode gadolinium-doped carbon quantum dot prepared through the method has the excellent characteristics of higher fluorescent property, higher relaxation efficiency, good biocompatibility and the like, is successfully applied to in-vitro live cell fluorescence imaging and in-vivo magnetic resonance imaging; the fluorescence-MRI dual-mode gadolinium-doped carbon quantum dot synthesized through the method is about to have wide application prospect in the field of biomedicine.

Compositions comprising fluorescent or colored dyes and methods of using the same in combination with divalent metal salts to analyze samples are disclosed.

The invention provides compounds and compositions of Formulas I-VII, and methods of using the compounds. The compounds can be used to prepare dye conjugates that are uniformly and substantially more fluorescent on proteins, nucleic acids or other biopolymers, than conjugates labeled with structurally similar known carbocyanine dyes. In addition to having more intense fluorescence emission than structurally similar dyes at virtually identical wavelengths, and decreased artifacts in their absorption spectra upon conjugation to biopolymers, the compounds can have greater photostability and / or higher absorbance (extinction coefficients) at the wavelength(s) of peak absorbance than such structurally similar dyes.

The invention relates to a polyester color silk production process. Polyester color silk is prepared by melting polyester chips and color master batch at high temperature, and drawing the components into silk. The polyester color silk production process comprises the following steps: precrystallizing glazed wet polyester chips in a crystallizer, putting the crystal into a solid-phase polycondensation reaction kettle for polycondensation reaction with nitrogen, feeding the tackified chips together with the color master batch which is subjected to drying and dehumidification treatment and cobalt acetate into a spinning screw rod extruder for melting, feeding the molten melt into a spinning component through a metering pump, filtering the melt inside the spinning component, spraying the melt into silk bundles through a spinneret plate at relatively high pressure, blowing cold air from a slow cooling area and a cooling accumulation chamber to cool the silk bundles, feeding the silk bundles into a drawing area, drying the silk bundles, heating to shape by using a heating roller, finally coiling to form, and packaging. Through the adoption of the process procedures, various types of colored industrial long polyester silk which is superhigh in wearing resistance, superhigh in fluorescence and superhigh in flexibility can be produced, and the colored industrial long polyester silk is widely used in multiple fields such as firefighting, braids, communication optical cables, fabrics and silk threads, and is accepted by users and the market.