4578 results about "Analytical chemistry" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

The invention relates to a czochralski method-based crystal growth interface shape detection method and device. The method comprises the steps that: a seed crystal temperature T and an interface electromotive force U at the same time in a crystal growth process are collected, and a T-U curve of the interface electromotive force U changing with the seed crystal temperature T is obtained; the change trend of the shape of a crystal growth interface in real time is judged by observing the deviation between the T-U curve and a reference line, wherein the reference line is a straight line passing through the starting point of the T-U curve, and the slope of the straight line is the Seebeck coefficient of the crystal. The invention also relates to a device used by the method. The detection method provided by the invention can detect the change trend of the shape of the crystal growth interface in real time in the crystal growth process, and can be applied to Czochralski method growth equipment for various single crystals such as lithium niobate, lithium tantalate, sapphire, yttrium aluminum garnet and the like.

A glass including silica and titania is disclosed. An average hydroxyl concentration of a plurality segments of the glass is in a range from about 20 ppm to about 450 ppm, an average titania concentration of the plurality of segments is in a range from about 6 wt. % to about 12 wt. %, and each segment of the plurality of segments has a length of about 12.7 mm, a width of about 12.7 mm, and a height of about 7.62 mm. The hydroxyl concentration of each segment is measured using a Fourier transform infrared spectroscopy in transmission, the refractive index is measured using an optical interferometer with a 633 nm operating wavelength and a resolution of 270 microns×270 microns pixel size, and the average titania concentration is determined based upon the measured refractive index.

The application discloses a potassium fluorotantalate crystallization purification method, and relates to the technical field of tantalum hydrometallurgy and fluorotantalate crystallization purification. The method comprises the following steps: filtering a tantalum-containing fluorine acid solution, adding a potassium source and a tantalum-niobium separation type composite crystallization regulator, stirring and complexing, seed induction, controlled cooling crystallization, graded removal of the regulator, solid-liquid separation, and potassium fluoride containing fluorine acid washing to obtain primary purified potassium fluorotantalate crystals, and then redissolving the primary purified potassium fluorotantalate crystals in a fluorine-containing acid solution, correcting the K / Ta molar ratio, repeatedly regulating and crystallizing, graded removal of the regulator, washing, and drying to obtain high-purity potassium fluorotantalate. The regulator can reduce the entrainment of niobium impurities and reduce the residual amount of the regulator itself, thereby improving the purity of the product and the Ta yield.

The present disclosure relates to a gas sensing method with enhanced selectivity. Specifically, the present disclosure relates to a gas sensing method for more accurately distinguishing various types of gases through a process of analyzing a correlation of two or more kinetic or static parameters from a temperature-dependent resistance change of a gas sensor according to two or more temperature conditions by changing the temperature of a captured external gas via a temperature control device.

In the present invention, the respective measured intensities of Compton and Rayleigh scattering lines (MC, MR) are extracted from the spectrum of a target sample in which a resin-containing thin film is formed on a base material (S21, S22) and a measured scattering intensity ratio (MC / R), which is the ratio of the measured intensity of the Rayleigh scattering line to the measured intensity of the Compton scattering line is obtained (S3). The thickness of the thin film and the contained amounts of respective elements constituting the target sample are determined by the fundamental parameter method on the basis of the measured scattering intensity ratio of the target sample (S5-S11).

A secondary battery and an electronic apparatus. Specifically, the secondary battery comprises: a positive electrode, a negative electrode, and an electrolyte; the positive electrode comprises a positive electrode current collector and a positive electrode material provided on the positive electrode current collector; the positive electrode material comprises lithium cobalt oxide; the electrolyte comprises methylene methane disulfonate and propenyl-1,3-sultone; relative to 100 parts by mass of the electrolyte, the sum of methylene methane disulfonate and propenyl-1,3-sultone is 0.02 parts by mass to 3.5 parts by mass. The overcurrent and over-temperature safety of the secondary battery are improved.

In order to realize a highly robust sample solution separation technique using a liquid photocurable resin in a microdevice for biological sample analysis, the present disclosure proposes a sample solution separation method in a microdevice for biological sample analysis, the method including the steps of introducing a sample solution into a plurality of fractions included in the microdevice for biological sample analysis, introducing a liquid photocurable resin into a flow path of the microdevice for biological sample analysis and covering openings of the plurality of fractions with the liquid photocurable resin to separate the plurality of fractions into which the sample solution has been introduced, and irradiating the microdevice for biological sample analysis into which the liquid photocurable resin has been introduced with light to solidify the liquid photocurable resin (see FIG. 2).

Provided are methods for flow cytometry analysis, including the setting and use of static gating thresholds separating positive fluorescence from negative fluorescence for each fluorescence channel in the assay.

Time-series data formed by acquiring values indicating amounts or states of a plurality of biological materials for each biological material at a plurality of time points is prepared, the plurality of biological materials are divided into a plurality of groups on the basis of temporal variations of time-series data of the respective biological materials, representative time-series data indicating a state of each group is generated on the basis of time-series data of at least one biological material included in each group, and dependencies between the groups are estimated on the basis of the representative time-series data of each group.

This utility model discloses a high-flow-rate catholyte circulation system for an electrolytic cell. Multiple cathode assemblies are arranged at intervals along the length of the electrolytic cell. Each cathode assembly includes a cathode frame and a cathode plate, with the cathode frame having a receiving space for the cathode plate. The high-flow-rate catholyte circulation system includes an inlet pipe configured to extend along the length of the multiple cathode assemblies below them. The inlet pipe has an inlet hole located below the cathode frame, and an inlet channel is formed between the inlet hole and the cathode frame to allow catholyte to be injected into the receiving space. The inlet channel penetrates the bottom of the cathode frame and fluidly communicates with the inlet hole and the receiving space, thereby creating a high-flow-rate circulating supply of catholyte around the cathode plates. This invention avoids the problem of reaction imbalance caused by differences in local conditions, enabling the electrolysis reaction throughout the electrolytic cell to proceed synchronously and stably, further improving the overall electrolysis reaction efficiency.

This utility model relates to the field of life science technology, and in particular to a nucleic acid extraction device. The device includes a frame, a sample loading and waste liquid treatment mechanism, a oscillating magnetic heating mechanism, a control device, and a screen interaction system. The sample loading and waste liquid treatment mechanism achieves precise three-dimensional positioning through horizontal and vertical motion guides and vertical moving components. It includes parallel large and small pistons, allowing for flexible switching between different volume pipetting and sharing a common connector. The oscillating magnetic heating mechanism integrates oscillation, heating, and magnetic attraction functions, and works with various sizes of pipette tips and reagent kits to complete sample processing. The extraction process is automated through the control device, linking all mechanisms to automatically complete the entire process, including sample lysis, solid-liquid separation, magnetic bead purification, and elution. This application automates nucleic acid extraction, improving operational efficiency and extraction results, and is suitable for nucleic acid extraction from plant tissues, animal tissues, blood, plasmids, and other samples.

The application discloses a kind of manganese-rich precursors and preparation method and positive electrode material thereof, and is related to lithium ion battery material technical field.The preparation method includes that metal salt solution, precipitant and complexing agent are simultaneously added to reaction kettle by metering pump and carry out coprecipitation reaction, and hydrogen peroxide solution is pumped into reaction system by metering pump in stages during reaction process and carries out liquid phase micro-oxidation treatment.The prepared precursor is spherical secondary particle, and is composed of nanoscale particle and interwoven sheet-shaped primary particle.The method utilizes the direct and uniform oxidation effect of hydrogen peroxide in liquid phase, and in-situ constructs stable high-valence manganese oxide on the surface of precursor, so that the prepared positive electrode material simultaneously has excellent electrochemical kinetics and structural stability.

This invention relates to a dual-potential electrochemiluminescence immunosensor based on enzymatic in-situ generation of a co-reactant, its preparation method, and its application. The sensor includes: a substrate electrode; a GOx@Au@MoS2 multifunctional sensing interface; a hybrid probe consisting of a cathode probe and an anode probe; the cathode probe is a Py-HOF-labeled AFB1 antibody, and the anode probe is a UiO66-NH2@luminol-labeled OTA antibody; glucose is added to the detection solution, and hydrogen peroxide is generated in situ through immobilized glucose oxidase, serving as the single co-reactant for both the cathode and anode. During detection, this invention generates H2O2 in situ through enzymatic generation, simultaneously exciting ECL signals at both the cathode and anode; it solves problems such as poor stability of the H2O2 co-reactant, inconvenient concentration control, multiple operation steps, and insufficient continuous supply; and it enables simultaneous quantitative detection of AFB1 and OTA with a single sample addition, without the need for external H2O2.

The application provides a kind of hierarchical extraction and analysis method of unrecoverable pollution in contaminated micro / ultrafiltration membrane, belongs to the field of membrane pollution analysis. Including the following steps: (1) pre-cleaning of contaminated micro / ultrafiltration membrane;(2) after the contaminated membrane is dried after pre-cleaning, immerse in the first solvent extraction liquid, make the membrane and the extraction liquid fully contact, after treatment, solid-liquid separation obtains first extraction liquid;(3) the second solvent extraction liquid is added to the membrane sample treated in step (2), the membrane sample is completely dissolved, and the second extraction liquid is obtained;(4) purification and analysis of extraction liquid: add the first extraction liquid or the second extraction liquid drop by drop to 5-10 times volume of pure water, centrifugal filtration solid after phase inversion to obtain purified extraction liquid, and analyze the physicochemical properties of the extraction liquid. The application extracts the unrecoverable pollution in the membrane under different temperature conditions and solvent concentration gradients by introducing polar organic solvent.

Systems and methods for determining a concentration of a substance in a sample. In one embodiment, the system uses a device that cooperates with a container containing a sample mixed with a solution. The mixture comes into contact with a sensor that has been activated by the device, thereby allowing data signals to be received by the device through electrodes that are coupled to the sensor. The data signals are then analyzed and, based on the characteristics of the signal, a concentration of the substance can be estimated. After a single use, the container is sealed and can be disposed of properly to avoid further contact with the solution or the sample. In some embodiments, a solid sample is first processed in a second container before being mixed with the solution.

The present invention relates to an optical or Raman micro-spectrometry apparatus (100) comprising an optical microscope objective (10) and an optical spectrometer (20). According to the invention, the micro-spectrometry apparatus comprises an astigmatic optical system (30, 31, 32) arranged outside the optical spectrometer (20, 21), between the microscope objective (10) and the optical spectrometer, the astigmatic optical system (30, 31, 32) being arranged and configured to form an astigmatic image of a light beam transmitted through the microscope objective (10) on the input slit of the optical spectrometer (20, 21), the astigmatic image being elongated by astigmatism in the height direction of the input slit, the optical spectrometer being able to spectrally disperse the astigmatic image and form a spectrally dispersed image of the field of view on the detector, the astigmatic optical system being configured to reduce an optical aberration of astigmatism of the optical spectrometer in the spectrally dispersed image.

The present invention provides a method (700) and apparatus for producing liquid sodium from sodium hydroxide other than by electrolysis. The method comprises reacting solid-phase sodium hydroxide in an anoxic environment with an amount of liquid sodium in excess of the stoichiometric amount thereof required to produce sodium oxide and hydrogen gas, capturing at least some of the hydrogen gas, phase-separating at least some of the sodium oxide from the excess amount of liquid sodium, thermally decomposing at least some of the sodium oxide under vacuum to produce sodium vapour and oxygen gas, condensing at least some of the sodium vapour to produce liquid sodium, and recycling some of the liquid sodium thus produced to the reaction with the solid-phase sodium hydroxide. Subject to real-world losses and inefficiencies, the amount of liquid sodium produced by condensing the sodium vapour is double the stoichiometric amount thereof required to react with the sodium hydroxide, so that half of it may be recycled back to this reaction, whilst recovering the same amount of sodium from the sodium hydroxide. This chemical cycle therefore analyses the sodium hydroxide into its constituent elements without consuming the liquid sodium with which the sodium hydroxide reacts and without using electrolysis. It therefore effectively provides a chemical alternative to the electrolytic production of liquid sodium via the Castner process, whilst also consuming less energy than the Castner process because of the latter's inherent inefficiency. The corresponding apparatus comprises a gas-tight reaction vessel for reacting the sodium hydroxide with the liquid sodium in an anoxic environment and capturing the hydrogen gas, a solid-liquid sodium phase separator for separating the sodium oxide from the liquid sodium, a vacuum chamber for thermally decomposing the sodium oxide into sodium vapour and oxygen, a sodium condenser for condensing the sodium vapour, and a liquid sodium return path for returning liquid sodium from the sodium condenser to the gas-tight reaction vessel. [Fig. 2]

本发明涉及一种锂硫电极中硫化锂的品质分析方法，作为分析锂硫活性材料中残留锂化合物的方法，所述分析方法包括：准备包括正极活性材料的电极的步骤；对所述电极进行充放电，以获取关于随容量(Specific Capacity)变化的电压(Voltage)的第一数据的步骤；以及基于所述第一数据，通过对随所述电压(V)变化的电池容量(Q)对所述电压(V)的微分值(dQ / dV)进行积分，获取并分析根据计算出的面积值而得到的数据的步骤。

This invention belongs to the field of electrochemical sensor technology for water quality analysis, specifically relating to an integrated sensor for rapid on-site self-separation detection of nitrite in complex seawater. It includes a self-separating membrane, a membrane slot, a screen-printed electrode, and an electrode slot. Two self-separating membranes fixed in the membrane slots and the screen-printed electrode fixed in the electrode slots are connected sequentially in a vertical direction, which is the sample flow direction. The screen-printed electrode is modified with ZnS / VMSF-TMAC material to form a sensing interface with anion-selective permeability. A filtrate storage cavity is formed between the self-separating membrane and the screen-printed electrode to store the filtrate to be tested after filtration through the self-separating membrane. This sensor, when used in complex seawater environments, has a detection range of 0.005-5 mM and retains 85% of the signal after 28 days of storage.

This disclosure relates to a sample diluent and its preparation method. Specifically, this disclosure relates to a sample diluent composed of Tris, Tween-20, BSA, mixed serum, and PC300. A key improvement is that the mixed serum is prepared by mixing goat serum and fetal bovine serum at a volume ratio of 2:1, and the mixed serum accounts for 40% of the sample diluent. The sample diluent of this disclosure is designed for the detection of lambda and kappa type free light chains, significantly reducing sample matrix interference, improving detection specificity and stability, and solving the technical problem of disproportionate dilution after high-value sample dilution. It is suitable for clinical testing, biomedical research, and other scenarios.

The electrostatic charge image developing toner set contains a fluorescent toner that contains a fluorescent colorant and has a brightness of 75 or more, and a non-fluorescent toner that contains no fluorescent colorant, in which an amount of Na+ on a surface of the fluorescent toner, that is measured by an ion chromatography method, is 0.005 mg / L or more and 0.050 mg / L or less, and a difference between the amount of Na+ on the surface of the fluorescent toner and an amount of Na+ on a surface of the non-fluorescent toner, that are measured by the ion chromatography method, is 0.050 mg / L or more, where the amount of Na+ is an amount of Na+ detected by a method in which 0.5 g of the fluorescent toner or the non-fluorescent toner is weighed, and then added to 100 g of deionized water at 30° C.±1° C., the mixture is dispersed by ultrasonic waves for 30 minutes, and then filtered through a filter, and the filtrate is analyzed by the ion chromatography method.

The invention relates to a processing device (10) for processing a substrate (12) for an electrochemical cell, comprising a mounting (14) for the substrate (12) and a processing unit (16) for processing the substrate (12), and to a method for processing a substrate (12) for an electrochemical cell, in particular by means of a processing device (10), wherein the substrate (12) is held by means of a mounting (14) and processed by means of a processing unit (16). The invention further relates to a substrate (12) for an electrochemical cell, the substrate having been processed by means of such a processing device (10) and / or using such a method. According to the invention, the substrate (12) is held by means of an at least partially cylindrical mounting (14), in particular a substantially cylindrical mounting.

The present invention relates to a method for extracting lithium from one or more lithium-containing batteries, the method comprising a dissolution step, the dissolution step comprising exposing a lithium-containing battery to an acidic leaching solution.

The present invention relates to an ink for the colorimetric detection of copper ions (Cu2+) present in aqueous solutions or an alcohol-water mixture, wherein said ink is based on an organic compound of the Schiff base family, and can be used as a sensor that shows a color change in the presence of copper ions in solution and impregnated onto paper strips at a concentration lower than the maximum permitted in the Mexican standard PROY-NOM-127SSA1-201. The analysis and detection can be carried out using the ink both in solution and impregnated onto paper strips (solid state), showing detection limits of 4.0x10-5 M (9.98 ppm), 8X10-6 m (1.99 ppm), respectively.

The application discloses a double-line ratio fluorescent competitive immunochromatographic detection device and a preparation method and application thereof, and relates to the technical field of immunochromatographic detection.The detection device comprises a double-specificity recognition unit mixed-labeled quenched fluorescent probe, a background fluorescent material and a solid phase substrate, the solid phase substrate is provided with a T line on which a target object binding ligand is immobilized and a C line on which a quality control ligand is immobilized; and the application also provides application of the detection device in detection of exogenous harmful substances.The application solves the technical problem of low detection sensitivity of the existing method, and adjusts the binding amount of the probe on the T line and the C line through an immune competition reaction, adjusts the quenching degree of the background fluorescence based on an internal filter effect, takes (T line quenched fluorescent signal / background fluorescent signal) / (C line quenched fluorescent signal / background fluorescent signal) as a quantitative signal, and takes the C line to participate in ratio calculation to improve the detection sensitivity, so that the application is suitable for high-sensitivity qualitative and quantitative detection of small molecule compounds and the detection sensitivity is improved.

The application discloses a 30# hard pitch flue gas low-toxicity risk characteristic fingerprint spectrum evaluation method and application. The application constructs a total ion flow chromatogram characteristic fingerprint spectrum of 30# hard pitch flue gas, the fingerprint spectrum comprises five characteristic peaks of 5-hydroxyvaleraldehyde acetate, alanine, 2,7-dimethyl-1-octanol, acetone and 3-ethyl-2-methylheptane, a to-be-tested pitch flue gas sample is collected, and whether the corresponding chromatographic peaks appear simultaneously is analyzed; if the corresponding chromatographic peaks appear simultaneously and the total peak area is greater than 30%, the pitch flue gas is determined as low risk. The low-toxicity characteristic fingerprint spectrum unique to 30# hard pitch is used as an evaluation benchmark, and scientific basis is provided for identification of low-emission pitch materials and health protection of construction personnel.

The present invention relates to a device for spectroscopic measurements, in particular X-ray diffraction (XRD), tem- perature-resolved second harmonic generation (TR-SHG) or infrared (IR) measurements, which prevents the formation of condensation (dew) or ice (frost) when carrying out spectroscopic measurements in sub-ambient temperature conditions and to a method of spectro- scopic measurements with said device.

The application provides an electrochemical sensing ELISA reagent card, comprising a microfluidic channel body and an electrochemical sensor body which are bonded together, wherein: a plurality of "annular" liquid flow channels are arranged on the microfluidic channel body, each "annular" liquid flow channel is formed by a working electrode covering flow channel and a counter electrode and a reference electrode covering flow channel in series, and the "annular" liquid flow channels are communicated through a common flow channel; the electrochemical sensor body comprises a flat plate substrate and a plurality of screen-printed electrodes which are printed in parallel on the flat plate substrate, and each screen-printed electrode comprises a working electrode, a counter electrode and a reference electrode. The electrochemical sensing ELISA reagent card combines an electrochemical biosensor and a microfluidic chip, and solves the technical problems of large sample / reagent consumption, single detection index and liquid volume influence on absorbance measurement of a traditional ELISA reagent kit.