73 results about "Raman Optical Activity Spectroscopy" patented technology

A system and method for determining charge variants in monoclonal antibodies using raman spectroscopy is disclosed.

The invention discloses a method for measuring the number of layers of a two-dimensional material by utilizing Goos-Haenchen displacement, which comprises the following steps: establishing a Goos-Haenchen displacement theoretical database when a horizontal polarized light beam is reflected on the surfaces of the two-dimensional materials with different layers at different incident angles according to a theoretical relation model of the two-dimensional materials with different layers and the Goos-Haenchen displacement; enabling the horizontal polarization incident light beam to be incident to the surface of the measured two-dimensional material at a certain incident angle; measuring Goos-Hanchen shift generated by the reflected light beam under the condition; sequentially changing the incident angles to obtain a group of Goos-Hanchen shift measurement data under different incident angles; and comparing and analyzing the measured data with theoretical data in a Goos-Hanchen shift theory database to obtain the number of layers of the measured two-dimensional material. Compared with a traditional two-dimensional material layer number measuring method, such as a Raman spectrum method, an atomic force microscopy method and a transmission electron microscope method, the method is easy to operate and high in measuring efficiency, does not damage a sample and has a good application prospect.

A positive electrode active material, a method of manufacturing the same, and a rechargeable lithium battery are provided. The positive electrode active material includes a first particle including a compound represented by Chemical Formula 1 and having a first average particle diameter. A ratio (ID / IG) of an intensity (ID) of a D peak at a wavenumber of about 1340 + / -10 cm <-1 > in a Raman spectrum obtained from Raman spectroscopy to an intensity (IG) of a G peak at a wavenumber of about 1590 + / -10 cm <-1 > in a Raman spectrum obtained from Raman spectroscopy is in a range of about 0.5 to about 1.5. Chemical formula 1Lia1Fex1B1y1PO4

The invention discloses a qualitative and quantitative detection method for graphene in a fiber fabric based on microwave assistance, and relates to the technical field of nano material analysis and detection. The qualitative and quantitative detection method comprises the following steps: adding a solvent and a dispersing agent into a fiber fabric sample, carrying out microwave-assisted dissolution treatment, adding the obtained mixture into a microwave-vortex ultrasonic-centrifugal integrated treatment system, and carrying out vortex dispersion, ultrasonic stripping and gradient centrifugal separation to obtain enriched graphene precipitate; the graphene precipitate is uniformly mixed with an internal standard substance silicon carbide, Raman spectroscopy is adopted for testing, qualitative analysis is carried out by analyzing the characteristics of a G peak and a 2D peak, and quantitative calculation is carried out on graphene according to the intensity ratio of a D peak to a silicon carbide characteristic peak. The method is efficient and accurate, and effectively solves the problems of low treatment efficiency, high cost, environmental pollution, easy damage of graphene structure and insufficient quantitative analysis precision of a traditional method.

A liquid (2) measurement chamber extension (10) for spectrophotometric characterization of a liquid (2) in a polymer container (3) by a NIR spectrophotometer (1) or a Raman spectrophotometer (1), the measurement chamber extension (10) comprising an adapter plate (11) having an adapter opening (11'); a container holder (7); and an optical element (5) selected from a mirror and a waveguide; the adapter (11) is configured to cover a measurement chamber (20) of the NIR spectrophotometer (1) or the Raman spectrophotometer (1) in a light-tight manner, the adapter opening (11') surrounding a measurement window of the NIR spectrophotometer (1) or the Raman spectrophotometer (1) to allow the NIR spectrophotometer (1) or the Raman spectrophotometer (1) to measure the spectrophotometric characterization of the liquid (2) in the polymer container (3). a measurement chamber extension (10) configured to provide exposure of the liquid (2) to a measurement light beam emitted from a measurement chamber (20) of a spectrophotometer (1) through the measurement window; the container holder (7) configured to bring the optical element (5) in close proximity to the polymer container (3) containing the liquid (2) to provide loss-free transmission or transflective of the measurement light beam from the optical element (5) to a detector of the NIR spectrophotometer (1) or the Raman spectrophotometer (1), the container holder (7) comprising a clamp (13) configured to hold a tubular section (3a) of the polymer container (3) to enable reproducible measurement conditions.

To provide a novel evaluation method that can evaluate the thickness of a heteroepitaxial layer of a heteroepitaxial substrate without destruction in a short time in the wide range regardless of whether light can transmit the heteroepitaxial substrate.SOLUTION: An evaluation method for a heteroepitaxial substrate including a heteroepitaxial layer on a surface of a substrate includes irradiating the heteroepitaxial substrate with laser light, acquiring Raman spectrum by Raman spectroscopy, obtaining Raman signal intensity (ISub) of the substrate and Raman signal intensity (IEpi) of the heteroepitaxial layer from the Raman spectrum, and evaluating the thickness of the heteroepitaxial layer on the basis of the ISub and the IEpi.SELECTED DRAWING: Figure 1

Provided is a chemically strengthened crystallized glass which has excellent moisture resistance.　With respect to a Raman spectrum of the chemically strengthened crystallized glass obtained by Raman spectrometry, when A1 is the peak area of 380-440 cm-1 and A2 is and the peak area of 520-570 cm-1, the maximum value of A2 / A1 in the depth range of 0-3 µm from the surface is 2.2 or less. The chemically strengthened crystallized glass contains Li2Si2O5 crystals.

The invention discloses a system and method for satellite communication. Aspects of wireless communications are described including a radio frequency (RF) amplifier chip configured for transmitting or receiving data, the chip including a first substrate including a first material and a second substrate including a second material different from the first material. The first substrate and the second substrate may be lattice matched such that an interfacial region between the first substrate and the second substrate exhibits an sp3 carbon peak at about 1332 cm <-1 >, having a full width at half maximum of no greater than 5.0 cm <-1 >, as measured by Raman spectroscopy. In some aspects, the first substrate and the second substrate allow the chip to transmit or receive data at a transmission rate of at least 500 megabits per second and a frequency of at least 8 GHz. In some aspects, the RF amplifier chip is part of a satellite transmitter.

A method of Raman spectroscopy for determining concentrations of at least one target component included in a medium including a given combination of multiple components includes: for each component of the medium, providing a reference spectrum of the component; based on Raman peaks included in the reference spectra, identifying Raman peaks that occur within less than a predetermined minimum spectral distance from each other as disturbing peaks; for each component, determining a component spectrum by eliminating each Raman peak included in the reference spectrum of the respective component identified as a disturbing peak; based on the component spectra, determining synthetic spectra of samples of the medium including different concentrations of the components; and based on the synthetic spectra, determining and providing a model for determining concentrations of each target component based on measured spectra of samples of the medium.

This invention discloses an endoscopic device for thyroid surgery based on fluorescence lifetime and Raman spectroscopy imaging, comprising: a light source assembly, an endoscope probe, a fluorescence lifetime image signal acquisition module, a Raman spectroscopy signal acquisition module, and a color image acquisition module; a host unit, including a control unit and an image processing unit; and a display for displaying an image fused with the Raman spectroscopy signal, the fluorescence lifetime image signal of cancerous tissue, and the color image, as well as an image fused with the Raman spectroscopy signal and the color image. This invention utilizes Raman spectroscopy to visualize the autofluorescence of the parathyroid glands, enabling precise localization of the parathyroid glands. Raman spectroscopy can also locate regional lymph nodes and adipose tissue in the central thyroid region, and combined with fluorescence lifetime imaging, it can provide the conformational state of fluorophores in the neck tissues, marking cancerous tissues and providing real-time optical auxiliary localization for differentiating various anatomical tissues during thyroid endoscopic surgery.

The invention discloses an optical fiber sensor system for in-situ high-temperature Raman spectroscopy. The system comprises an excitation source, a spectrograph and a Raman probe. The Raman probe includes at least one optical fiber coupled to an excitation source and to a spectrometer. The at least one optical fiber transmits laser excitation from the excitation source to the sample and collects light scattered by the sample for analysis by the spectrometer. An outer lens arrangement positioned at a distal end of the at least one optical fiber of the Raman probe optically couples the at least one optical fiber to the sample and physically separates the at least one optical fiber from the sample during sampling. The spectrometer performs Raman spectroscopy of the sample based on the light collected by the at least one optical fiber.

A conductive composition includes a binding resin and a conductive polymer, wherein the conductive polymer has a quinoid structure and a benzoid structure, and wherein a ratio of a half-width value of a peak intensity corresponding to the benzoid structure to a half width of a peak intensity corresponding to the quinoid structure in Raman spectra obtained by Raman spectroscopy is 0.5 to 12.

To provide a structural component with a highly durable protective film against plasma. [Solution] The structural member 10 comprises a base material 100 and a protective film 200 covering the surface 110 of the base material 100. The protective film 200 mainly contains yttria, and in the Raman spectrum of the protective film 200 obtained by Raman spectroscopy, 370 cm⁻¹ -1 The half-width of the peak at nearby wavenumbers is 23 cm. -1 That's all.

Anode material, and battery. Anode material includes graphite and carbon layer located on at least part of surface of graphite. Particle surface and particle section of anode material are respectively tested by Raman spectroscopy, peak area ratio of D characteristic peak within range of 1300 cm−1 to 1350 cm−1 to G characteristic peak within range of 1500 cm−1 to 1580 cm-1 is ID / Ig, ratio of ID / IG measured on the particle surface is A, and ratio of ID / IG measured on particle section is B, and 1.22<A−B≤2.10. Anode material improves lithium-ion transport kinetics, initial Coulombic efficiency, and cycle performance.

According to an embodiment, an electrode is provided which includes an active material-containing layer, and the active material-containing layer contains an active material, a first conductive agent, and a second conductive agent. The integrated intensity I D of the D band of the first conductive agent in the Raman spectrum G and the integrated intensity I D of the G band G has a ratio I D / I G of 0.5 < I D / I G < 2, and for the second conductive agent, 0 < I D / I G < 0.5. In the constituent material mapping image obtained by Raman spectroscopy for the active material-containing layer, the occupied area S1 of the first conductive agent relative to the occupied area Sa of the active material satisfies 0.1 < S1 / Sa < 1.0, the occupied area S2 of the second conductive agent relative to the occupied area Sa of the active material satisfies 0.8 < S2 / Sa < 10, the distance between the centers of gravity R1 of the first conductive agent relative to the distance between the centers of gravity Ra of the active material satisfies 1.0 < R1 / Ra < 1.5, the distance between the centers of gravity R2 of the second conductive agent relative to the distance between the centers of gravity Ra of the active material satisfies 0.5 < R2 / Ra < 1.0, and the relationship R1 > R2 > R1-2 is satisfied for R1, R2, and the distance between the centers of gravity R1-2 between the first conductive agent and the second conductive agent.

To provide a carbon carrier which achieves effective maintenance of performance of a metal-supported catalyst, and to provide a metal-supported catalyst, an electrode and a battery in which performance is effectively maintained.SOLUTION: Wherein a volume of pores having pore diameters in a range of more than 77K and 0nm or less, which is obtained by a DFT method from a nitrogen-adsorption isotherm at a temperature of 70nm, is 0. 70cm3 / g or less, A volume of pores having pore diameters less than 5nm is 0. 31cm3 / g or more, a true concentration obtained by a constant volume expansion method is 1. 9g / cm3 or more, and a half width at half maximum of a D band having a peak top near a Raman shift 1340cm of - 1 is 50cm of - 1 or less.SELECTED DRAWING: None

The present invention relates to an apparatus and method for non-invasive in vivo measurement, by Raman spectroscopy, of glucose present in interstitial fluid in the skin of a subject. The apparatus c

A negative electrode 6 according to the present disclosure comprises a long negative electrode mixture layer 6b. The negative electrode mixture layer 6b contains graphite as a negative electrode active material. The negative electrode mixture layer 6b includes a first end region 61 including a first end 64a in the width direction, a second end region 62 including a second end 64b in the width direction, and a central region 63 including a center 64c in the width direction. The Raman spectrum ID / IG ratio of the first end region 61 is greater than the Raman spectrum ID / IG ratio of the central region 63. The "Raman spectrum ID / IG ratio" as used herein is the ratio of a peak intensity ID of a D band appearing in the vicinity of Raman shift 1348 cm-1 to a peak intensity IG of a G band appearing in the vicinity of Raman shift 1575 cm-1 in a Raman spectrum that is obtained by analyzing the surface of the negative electrode mixture layer by Raman spectroscopy.

The present application belongs to the technical field of biochemical sensing, and specifically provides a non-contact real-time detection system for liquid concentration detection and substance identification, which is used to overcome the shortcomings of Raman spectroscopy, such as fluorescence interference, strong water molecule absorption influence, and the long wavelength scanning time and limited detection distance of photoacoustic spectroscopy. The non-contact real-time detection system comprises a laser pumping system, a laser ultrasonic detection system, a CCD focusing control system and a detection module. The laser pumping system is used for pumping the measured sample, exciting and generating ultrasonic waves, and the laser ultrasonic detection system is used for detecting the ultrasonic signal in the measured sample. The CCD focusing control system is used for real-time monitoring of the focusing state of the pumping light beam and the detection light beam, so as to ensure the pumping efficiency and the detection sensitivity. The detection module is used for accommodating the measured sample. Finally, the time-domain data collected by the system is integrated and summed, and the liquid concentration can be detected through the integral intensity calibration. After the collected time-domain data is converted into frequency spectrum data, the machine learning method can be used to identify the substance category.

Provided is a secondary battery in which charge / discharge characteristics can be improved. The secondary battery comprises: a positive electrode that includes positive electrode active material particles; a negative electrode; and an electrolyte that contains an aqueous solvent. The positive electrode active material particles include a lithium manganese composite oxide having a spinel crystal structure. The pH of the electrolyte is smaller than 9. The ratio I2 / I1 of the maximum value I1 of scattered light intensity in the range of 600 cm-1 to 700 cm-1 and the maximum value I2 of scattered light intensity in the range of 950 cm-1 to 1000 cm-1 as measured by Raman spectroscopy using excitation light of 532 nm on the surface of the positive electrode active material particles is 0.2 to 2, inclusive. The molar ratio of phosphorus to manganese as measured by X-ray photoelectron spectroscopy on the surface of the positive electrode active material particles is 0.2 to 5, inclusive.

The following description generally relates to techniques, devices, apparatuses, and methods used for screening and characterizing a plurality of samples within an experimental run by X-ray diffraction (XRD) experiments in which it may be useful to investigate a relatively large number of samples, several samples in situ, sequentially and / or simultaneously. The present disclosure concerns a multiwell device allowing, for example and without being limitative, high-throughput screening and in-situ characterization of materials which can be investigated using XRD-based techniques. The screening achievable using the technology that will be herein described does not require the time-consuming step of removing the material or the sample during an experiment, and is also compatible with various analytical techniques, which include but are not limited to the XRD-based techniques mentioned above. Another example of such analytical techniques includes spectroscopic methods (e.g., infrared spectroscopy or fluorescence- based screening techniques).

This invention provides a carbon nanotube slurry that has low viscosity, excellent handling properties, and good conductivity when used as an electrode film. [Solution] The solution comprises carbon nanotubes having a fiber length of 50 μm or more, an average diameter of 3 nm to 20 nm, and a peak intensity ratio G / D of 1.0 to 2.6 in Raman spectroscopy; polyvinylpyrrolidone having a weight-average molecular weight of 70,000 or less; and at least one selected from the group consisting of N-methyl-2-pyrrolidone, ethanol, and water. (However, the intensity ratio G / D is the Raman spectrum obtained by the Raman spectroscopy method at 1570 cm⁻¹.) -1 ~1620cm -1 The maximum intensity of the G-band scattered light peak in the range is G, 1320 cm. -1 ~1370cm -1 (When D is the maximum intensity of the D-band scattered light peak within the specified range, this represents the ratio.)

This invention relates to the field of nondestructive testing technology, specifically to a method and system for detecting the phase transition content of thermal barrier coatings. It addresses the problem that existing methods for detecting phase content in thermal barrier coatings suffer from significant errors, reducing the accuracy of characterization. The terahertz time-domain spectroscopy-based method for detecting the phase transition content of thermal barrier coatings provides this invention. It employs an effective medium theory model to directly correct the effective refractive index of the thermal barrier coating under test, obtaining its intrinsic refractive index. This successfully eliminates the interference of porosity variations on the refractive index, avoiding misjudgments caused by porosity changes. Furthermore, it only requires a non-contact terahertz time-domain spectroscopy system to obtain the material state information of the thermal barrier coating under test, eliminating the need for complex destructive sample preparation and overcoming the disadvantages of traditional XRD and Raman spectroscopy, which are destructive and inefficient.

The invention discloses a polaroid element chromaticity regulation and control method based on iodine form quantitative detection, and belongs to the technical field of optical thin films. The method comprises the following specific steps: S1, preparing a polaroid element; s2, quantitatively detecting the total content of polyiodide ions I3 <-> and I5 <-> in the polarizer element by adopting wide-angle X rays; s3, determining the proportion of polyiodide ions I3 <-> and I5 <-> in the polaroid elements by adopting a Raman spectrum method; s4, determining the total iodine content in the polarizer element by adopting an improved oxidation-reduction titration method; and S5, based on the contents of I3-and I5-in the polaroid elements accurately obtained in the steps S2-S4, regulating and controlling the chromaticity of the polaroid elements. According to the method, the total content of polyiodide ions I3-and I5-in the polaroid elements is determined through wide-angle X-rays, the proportion of I3-to I5-in the polaroid elements is determined through the Raman spectroscopy, the total iodine content in the polaroid elements is determined through the improved oxidation-reduction titration method, and the content of I3-and I5-in the polaroid elements can be accurately obtained.

The present invention provides a chlorinated polyvinyl chloride resin that provides a molded article having excellent heat cycle characteristics and excellent weather resistance, as well as a resin composition for molding and a molded article each including the chlorinated polyvinyl chloride resin. Provided is a chlorinated polyvinyl chloride resin having an average of a ratio (A / B) of a peak intensity A observed in a range of 300 to 340 cm−1 to a peak intensity B observed in a range of 1,450 to 1,550 cm−1 of 3.5 to 40.0 in Raman imaging measurement by Raman spectroscopy.

To provide a positive electrode active material having high conductivity and a high electrochemical characteristic.SOLUTION: The present invention relates to a positive electrode active material for a lithium secondary battery, a manufacturing method for the same, and a lithium secondary battery including the same. More specifically, a first particle containing a compound expressed by Chemical Formula 1 and having a first average particle diameter is included. In a Raman spectrum of the first particle obtained by Raman spectroscopy, the ratio (ID / IG) of the peak intensity (ID) of D peak existing at a wavenumber of 1340±10 cm-1 to the peak intensity (IG) of G peak existing at a wavenumber of 1590±10 cm-1 is 0.5 to 1.5.SELECTED DRAWING: Figure 7

The present invention relates to a Raman spectroscopic analysis method for analyzing trivalent and pentavalent arsenic contamination in soil at the site, and more specifically, to a Raman spectroscopic measurement and analysis method capable of determining trivalent and pentavalent arsenic solely by the ratio of Raman signals in the 300–400 cm-1 band and signals in the 730–830 cm-1 band. According to the present invention, measurement and analysis for detecting trivalent and pentavalent arsenic contamination can be performed by placing several band filters in parallel in front of a photodetector without using an expensive spectrometer for Raman spectroscopy at the site.

According to one embodiment of the present invention, provided are a positive electrode active material for a lithium secondary battery, a method for preparing the same, and a positive electrode and a lithium secondary battery comprising the same, the positive electrode active material comprising a lithium compound represented by the following Chemical Formula 1 and a coating layer formed on particle surfaces of the lithium compound, wherein the coating layer contains carbon and a surface modifier, and wherein the positive electrode active material has a D / G band ratio of 0.7 to 0.89 when the surface of the positive electrode active material is measured by Raman spectroscopy, [Chemical Formula 1] Li1 + aTibMncO2-dXd in Chemical Formula 1, 0.1 < = a < = 0.5, 0.2 < = b < = 0.6, 0.2 < = c < = 0.6, 1.1 < = (1 + a) / (b + c) < = 1.5, 0 < = d < = 0.2, and X is a halogen element.

A hand-held microfluidic testing device is provided that includes a housing having a cartridge receiving port and a cartridge for input to the cartridge receiving port. An optical detection system in the housing is capable of providing an illuminated electric field useful for Raman spectroscopy. The cartridge may have a sample well. The sample well is loaded with a mixture of wa- ter containing the analyte, Raman-scattering nanoparticles and a calibration solution. The calibration solution contains an analogue of the analyte differing in its Raman response, for example an isotope of the analyte. Optionally, a chemical compound capable of in- creasing interaction between the analyte and the nanoparticles may be added.

An analysis apparatus for analyzing a sample substance by means of Raman spectroscopy comprises a sample space for receiving the sample substance, a laser system for irradiating the sample substance located in the sample space with laser light, and a detection unit for generating a Raman spectrum using scattered light that emanates from the sample substance. The laser system has a laser unit comprising a light exit surface for the exit of a laser beam and a dispersing element that is arranged at a spacing from the light exit surface such that said dispersing element is acted on by the laser beam and transmits at least a portion of the laser light towards the light exit surface for a feedback. The sample space is arranged between the laser unit and the dispersing element and the detection unit is arranged such that it receives the scattered light emanating from the sample substance via the dispersing element.