147 results about "Dynamic light scattering" patented technology

The invention discloses an LED street lamp multi-scene intelligent regulation and control method and system for road illumination. The method comprises the steps that environment sensing parameters and equipment state parameters are collected; constructing a dynamic light scattering model according to the environment perception parameters and the equipment state parameters, predicting effective illumination distribution from the LED light source to the road surface in the current environment, and generating an LED spectrum compensation strategy; the real value of effective illumination distribution from the LED light source to the road surface is monitored in real time, the deviation between the real value and a predicted value is analyzed, and if the deviation exceeds a preset threshold value, the light attenuation coefficient, the road surface equivalent reflectivity and the LED working temperature are calculated in a reverse iteration mode according to the deviation so as to update the LED spectrum compensation strategy; and generating a PWM (Pulse Width Modulation) driving signal according to the updated LED spectrum compensation strategy, controlling the duty ratio of each sub light source in the LED array, and dynamically adjusting the LED spectrum distribution. According to the method, the LED operation parameters are dynamically regulated and controlled through the deviation between the true value and the predicted value of the effective illumination distribution, the light attenuation is compensated in real time, the spectral efficiency is optimized, and the LED power consumption is reduced on the premise of ensuring the illumination quality.

The invention discloses a vector flow velocity measuring device and method based on a bidirectional scanning spectral domain optical coherence tomography technology. Comprising a super light-emitting diode light source, an optical fiber coupler, a polarization controller, an interferometer comprising a sample arm and a reference arm, and a collimating lens, the collimating lens, the grating, the focusing lens group and the linear array camera are sequentially connected through a light path; the linear array camera, the computer and the two-dimensional galvanometer are sequentially connected through a line; according to the method, the fixed bias vector velocity is introduced by utilizing the bidirectional scanning technology, the dynamic light scattering optical coherence tomography method and the Doppler optical coherence tomography method are combined, decoupling of each parameter of the vector flow velocity is efficiently and accurately realized, and a quantitative index is provided for vector flow velocity analysis. The vector flow velocity measuring device based on the bidirectional scanning spectral domain optical coherence tomography technology is simple in system setting and low in cost, the time resolution is improved by about 2.5 times, and the measuring time is shorter.

The invention provides a contact lens with peripheral defocus, and relates to the technical field of optical lenses, the lens comprises a contact optimization core area, a partitioned progressive microprism array area and a dynamic light scattering area, and the specific setting is as follows: the contact optimization core area is located at the geometric center of the lens, the outward extension radius is 1.8-2.2 mm, and the contact optimization core area provides clear central vision; according to the intelligent self-adaptive contact lens, the intelligent self-adaptive contact lens is characterized in that the intelligent self-adaptive contact lens comprises a contact optimization core area and a partition progressive microprism array area, the partition progressive microprism array area is located on the outer side of the contact optimization core area and surrounds the contact optimization core area in a concentric ring shape, and through collaborative design of the partition progressive microprism array area and the dynamic light scattering area, the real-time monitoring and dynamic adjusting capacity of a photoelectric feedback control module is combined; the problem that an optical structure of an existing product lacks dynamic adaptability is effectively solved, and the optical structure can be changed according to different illumination environments and wearing duration.

The invention discloses a multi-technology combined medication analysis platform of an oligonucleotide drug, which relates to the technical field of drug analysis and is technically characterized by comprising an oligonucleotide drug delivery technology module, a liposome, a polymer nanoparticle or an exosome is selected as a delivery carrier, the surface of the delivery carrier is modified with hydrophilic polyethylene glycol or a targeting ligand, and the oligonucleotide drug delivery technology module is connected with the oligonucleotide drug delivery module. The performance of the material is represented by dynamic light scattering and a transmission electron microscope; the multi-technology platform analysis module integrates RT-qPCR, LC-FL, LC-MS / MS and LC-HRMS technologies, is respectively used for target gene expression quantification, drug distribution tracking, drug principal component quantification and metabolite structure analysis, establishes a cross validation rule, and requires a correlation coefficient R2gt of an LC-MS / MS quantitative result and RT-qPCR expression data; 0.95%, 0.95%; the pharmacokinetic evaluation module constructs a PBPK model to predict human pharmacokinetic parameters, and draws a drug metabolism network diagram in combination with an LC-HRMS metabolite identification result; by integrating various advanced analysis technologies, the problems of low sensitivity, poor specificity and difficult metabolite analysis in the prior art are solved.

The invention provides selenium nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of selenium nanoparticles. Acetone ultrasonic cleaning and chemical polishing pretreatment are performed on a pure titanium substrate to obtain a clean surface, an anodic oxidation method is adopted to prepare a # imgabs0 # nanotube array carrier, and the nano-particles are prepared into selenium nano-particles. The method comprises the following steps: accurately depositing selenium nanoparticles on a carrier by using an electrochemical deposition method, realizing load control by combining an electrochemical kinetics principle, realizing uniform dispersion of the particles by matching an ultrasonic dispersion technology with a particle swarm optimization algorithm, and carrying out centrifugal separation and vacuum drying to obtain a spherical selenium nanoparticle product. And a multi-dimensional quality control detection system of a transmission electron microscope, an X-ray photoelectron spectroscopy and dynamic light scattering is established, so that the technical problems that the particle size distribution is non-uniform and the deposition load is difficult to accurately control in the preparation process of the selenium nanoparticles are solved.

The invention discloses a calcium hydroxide and industrial wastewater co-treatment method, and relates to the technical field of environmental engineering, and the method comprises the following steps: S100, adopting global dynamic light scattering and electromotive force imaging combined monitoring, and monitoring surface charge change and particle size evolution of nanoparticles in industrial wastewater in a calcium hydroxide adding process in real time, and extracting a dynamic threshold index of dispersion stability mutation. According to the invention, a dispersion stability threshold is extracted through dynamic light scattering and electromotive force imaging, a particle dispersion risk index is constructed, real-time evaluation of aggregation failure of nanoparticles and dynamic prediction of a feeding strategy are realized, linkage feeding of a chelating organic polyamine flocculant is combined, bridging and surface energy mutation are blocked, and stability of charges and particle sizes is maintained. By means of closed-loop feedback and on-line early warning, the adding proportion is optimized, the gathering and settling efficiency is improved, membrane pollution and filtering blockage are reduced, and the stability and economical efficiency of wastewater treatment are improved.

The invention relates to the technical field of biology, and discloses a nano composite probe as well as a preparation method and application thereof. The nano composite probe comprises an iron-based metal organic framework, glucose oxidase loaded on the surface of the iron-based metal organic framework, and an anti-cTnI antibody coupled with the glucose oxidase. According to the nano-composite probe, glucose oxidase, an acid-responsive iron-based metal organic framework and a detection antibody are subjected to function integration, so that three-in-one of recognition, driving and feedback is realized; a cardiac troponin I detection method based on a nanoprobe triggered enzyme catalysis-MOF disintegration-Fenton reaction self-amplification cascade system innovatively adopts a strategy of etching a DNA protective layer by hydroxyl radicals to regulate and control gold nanoparticle salt-induced aggregation, and finally reads signals through dynamic light scattering, so that ultrahigh-sensitivity detection is realized, the detection limit is as low as 1.5 * 10 <-13 > g / mL, and the detection time is greatly shortened. The stability and the specificity are excellent.

The utility model discloses a particle size measuring device based on combination of a dynamic light scattering method and a sedimentation method. The particle size measuring device comprises a laser, a light intensity adjusting unit, a sample pool, a thermostatic bath, a PD detector, an optical fiber head, an APD detector, a data acquisition unit, a PC and a control unit. The laser emits incident laser, the incident laser passes through the light intensity adjusting unit, penetrates through the sample cell and a sample and then enters the PD detector, and a transmission light signal is collected through the data acquisition unit and transmitted to software for calculating the particle size and concentration of settled large particles; scattered light is received by an optical fiber head with a fixed angle of 90 degrees or 160-175 degrees and is converted into a digital signal by an APD detector, and the digital signal enters a data acquisition unit and is transmitted to software for calculating the particle size of particles in a non-settling nanometer range. According to the technical scheme provided by the utility model, the particle size distribution information of the wide-distribution particle dispersion system in a nanometer-micron order range is measured in a testing process.

This molybdenum trioxide powder has a specific surface area, as measured using the BET method, of 100 mｍ2 / g-500 m2 / g. The molybdenum trioxide powder may have a median diameter D50 of 5-1000 nm, as determined using a dynamic light scattering method. The molybdenum trioxide powder may have a purity of 99 mass% or more. The molybdenum trioxide powder may include molybdenum trioxide having a β crystal structure.

The invention discloses a hydrophobic Ru nano-particle catalyst, a preparation method and application of the hydrophobic Ru nano-particle catalyst in bisphenol A hydrogenation reaction. The catalyst is prepared by dissolving a ruthenium salt precursor, mixing the ruthenium salt precursor with a surfactant containing nitrogen, phosphorus or sulfur, and reacting through a reducing agent in an inert atmosphere. The preparation method is simple and efficient, and reduction-modification coupling is realized in one step. Different from a traditional supported Ru catalyst, active sites of the carrier-free hydrophobic Ru nanoparticle catalyst are fully exposed, the particle size distribution uniformity of nanoparticles is excellent, and the dynamic light scattering PDI is smaller than or equal to 0.19. In the bisphenol A hydrogenation reaction, the raw material conversion rate reaches 95% or above, the selectivity of the target product hydrogenated bisphenol A reaches 95% or above, the conversion rate and the selective attenuation rate are both smaller than 5% after 5 cycles, and excellent cycle stability is achieved.

A molybdenum trioxide powder, which contains an aggregate of primary particles comprising a crystal structure of molybdenum trioxide, the crystal structure comprising α-crystals having an average crystallite size of 50 nm or less. The median particle diameter D50 of the primary particles, which is obtained by a dynamic light scattering method, is 2000 nm or less. 50 is 2000 nm or less.

The invention discloses an intelligent preparation and control method for nano metal powder driven by a droplet microfluidic technology, relates to the technical field of metal powder processing, and aims to accurately control particle distribution, calculate particle size distribution uniformity Dcv and dispersion stability coefficient Dsf and optimize a shear flow field through a droplet interface dynamic model in combination with a dynamic light scattering and adaptive optimization algorithm. The particle size uniformity is ensured, the powder stacking density and the conductive stability are improved, and the problem that particle size distribution is difficult to accurately control in an existing method is solved; a high-sensitivity sensor is adopted to monitor environmental interference, Fourier transform analysis and Gaussian process regression reinforcement learning are combined to optimize temperature and flow velocity, by-products and pollutants are reduced, powder purity is ensured, long-term stability of electronic devices is improved, and resistance drift or local overheating is avoided. And aiming at the agglomeration problem, an agglomeration trend value Pag is calculated and graded evaluation is carried out, so that particle agglomeration is effectively inhibited, and the stability and reliability of the conductive material are improved.

This invention relates to aqueous sols and organic solvent sols containing highly stable hollow silica particles, and further to methods for improving the stability of the aforementioned sols, which have suffered reduced storage stability, and methods for manufacturing such sols. To this end, a hollow silica sol is provided, containing hollow silica particles with spaces within the outer shell and monovalent alkali metal ions, wherein the molar number of these monovalent alkali metal ions, converted to M₂O (M representing a monovalent alkali metal atom), is 7.12 × 10⁻⁶ moles of SiO₂ in the hollow silica particles. ‑6 ~285×10 ‑6 The sol contains hollow silica particles and monovalent alkali metal ions in a specific ratio. After being stored at 50°C for 48 hours, the average particle size measured by dynamic light scattering (DLS) is within 2.0 times that of the average particle size measured by DLS before storage. The average particle size measured by DLS is 20–150 nm. A stabilization method involves adding monovalent alkali metal ions to the hollow silica sol, where the DLS particle size value is larger than that during manufacturing, in the aforementioned ratio of monovalent alkali metal ions to SiO2 in the hollow silica particles, thereby reducing the increased DLS particle size value.

Provided is a silica sol in which silica particles are dispersed in a nitrogen-containing solvent for mixing with polyimide-based and polyamide-based polar resins in a state of good compatibility, said silica sol being capable of being subjected to additional silane treatment according to the use or the like, having excellent storage stability at a high concentration, and having both customizability and reliability. The silica sol contains silica particles having an average particle diameter of 5-100 nm obtained by a dynamic light scattering method and having an organic group containing an unsaturated bond between carbon atoms bonded to the surface, and a nitrogen-containing solvent, the amount of organic groups that are bound to the surfaces of the silica particles and that contain unsaturated bonds between carbon atoms is 0.1-2.0 per unit area of the surfaces of the silica particles, the concentration of the silica particles is 25-70 mass%, and free silanol groups are present on the surfaces of the silica particles. The amount of free silanol groups present per unit area on the surface of the silica particles is 0.4-1.2 per nm2.

This invention uses nano-cerium oxide as an abrasive, with a dynamic light-scattering particle size of 1-30 nm, which helps reduce scratches caused by chemical mechanical processes. The removal rates of silicon oxide, silicon nitride, and polycrystalline silicon can be controlled by selecting appropriate additives. Specifically, the ratio of silicon oxide removal rate to silicon nitride removal rate can be adjusted within the range of 2:1 to 3500:1, and the ratio of silicon oxide removal rate to polycrystalline silicon removal rate can also be adjusted within the range of 2:1 to 3500:1.

The present invention provides a tantalic acid compound dispersion containing tantalum. The tantalic acid compound dispersion contains an organic acid and one or more elements X selected from the group consisting of alkali metal elements and / or alkaline earth metal elements. The tantalic acid compound dispersion has a D50 (on a volume integration basis) of 100 nm or less as measured by a dynamic light scattering.

A PVA excellent in resistance to melting at high temperature is provided. The polyvinyl alcohol-based polymer is a saponificated product of a homopolymer composed of a vinyl ester monomer, a copolymer of a vinyl ester monomer and a monofunctional monomer other than the vinyl ester, a copolymer of a vinyl ester monomer and a polyfunctional monomer, or a copolymer of a vinyl ester monomer, a monofunctional monomer other than vinyl ester, and a polyfunctional monomer has a particle size of 50 nm or more at a cumulative frequency of 50% in particle size distribution by dynamic light scattering measurement of a 0.4 mass % aqueous solution of the polyvinyl alcohol-based polymer at 25° C.

A tricyclodecanedimethanol composition is provided. Applications using the above tricyclodecanedimethanol composition are also described. [Solution] A tricyclodecanedimethanol composition comprising tricyclodecanedimethanol, wherein the 173° backscatter intensity T1 measured at a temperature of 25°C using a dynamic light scattering measurement method of the tricyclodecanedimethanol composition is equal to that of a standard sample (D 50 A tricyclodecanedimethanol composition that satisfies the following condition: when the backscattering intensity of a 0.002 volume% aqueous suspension of latex with a wavelength of 300 nm is T2, T2÷8.0 ≤ T1 ≤ T2×5.0.

The invention discloses a single-angle and multi-angle autocorrelation curve fitting regression method for dynamic light scattering, and aims to solve the problem of high noise of an autocorrelation curve, a fitting regression mathematical model is established in a DLS (Digital Light Scattering), and the acquired autocorrelation curve data is not directly inverted during inversion calculation regardless of a single angle or a multi-angle. Instead, fitting regression is firstly carried out to obtain an autocorrelation curve which is subjected to noise filtering and is close to a theoretical curve, and then particle size distribution inversion calculation is carried out on the fitting curve, so that more accurate and more stable particle size distribution result data can be obtained.

A method, system, and apparatus for synchronizing laser dither and correlator clocks to improve dynamic light scattering is disclosed. An example laser dither and correlator synchronizing system includes a laser driver configured to output a laser. The example laser dither and correlator synchronizing system further includes a correlator having an internal clock. The example laser dither and correlator synchronizing system further includes a waveform generator configured to receive a clock signal from the internal clock of the correlator, receive a dither signal from a controller, and output a laser modulation signal to the laser driver based on the dither signal and the clock signal.

The present invention relates to colloidal silicon dioxide containing silicon dioxide particles with a small average secondary particle size and dispersion stability that can be maintained for extended periods even under strongly acidic conditions at a pH of 3 or less, and to a method for its preparation. The present invention relates to colloidal silicon dioxide comprising silicon dioxide particles, wherein the silicon dioxide particles have an average secondary particle size of 20 nm or less, as measured by dynamic light scattering, and a zeta potential of -20 mV or less, as measured at a pH of 3, and are surface-modified with a sulfonic acid group.

To provide an organosol containing hollow silica particles, which contains hollow silica particles at a high concentration and has high dispersion stability in a medium. [Solution] A hollow silica organosol containing the following components (A) and (B), wherein the component (A) is contained in an amount of 20% by mass to 70% by mass relative to the total amount (100% by mass) of the organosol, and a method for producing the hollow silica organosol: Component (A): aluminum atom-containing hollow silica particles, wherein the amount of aluminum atoms present throughout the hollow silica particles is 120 to 50,000 ppm / SiO2 in terms of Al2O3 relative to the mass of the hollow silica particles, and the average particle diameter measured by dynamic light scattering is 20 to 150 nm; Component (B): A dispersion medium containing at least one of an organic solvent, a reactive monomer, and a polymer.

Provided are a dynamic light scattering measurement method and a dynamic light scattering measurement device with which it is possible to ascertain the particle size distribution for each type of particle included in a dispersion that includes particles. This dynamic light scattering measurement method for a dispersion including a plurality of types of particles includes: a measurement step in which scattering intensity in a dispersion is measured a plurality of times, while changing one value of at least scattering angle and measurement wavelength from among measurement parameters, so as to obtain a plurality of scattering intensity data points; a calculation step in which a plurality of scattering intensity temporal variation data points and a plurality of scattering intensity parameter-dependent data points are calculated using the plurality of scattering intensity data points obtained in the measurement step; and a step in which the plurality of scattering intensity temporal variation data points and the plurality of scattering intensity parameter-dependent data points obtained in the calculation step are fitted to a formula establishing the relationship between particle size and the scattering intensity so as to determine the particle size distribution of each of the plurality of types of particles.

This niobic acid compound dispersion contains niobium, one or more elements (X) selected from among alkali metal elements and alkaline earth metal elements, and a phosphorus compound and / or a chlorine compound, and has a particle diameter (D50) of 1,000 nm or less as determined by a dynamic light scattering method. Furthermore, this niobic acid compound dispersion contains niobium, one or more elements (X) selected from among alkali metal elements and / or alkaline earth metal elements, and a phosphorus compound and / or a chlorine compound, and has a maximum transmittance of 70% T or more in a wavelength region of 400-760 nm.

A method for producing a polishing composition comprising diluting an undiluted liquid containing abrasive grains, wherein the dilution is carried out using a diluent consisting of only one or more types of water selected from the group consisting of ion-exchange water, pure water, ultrapure water, or distilled water, and wherein the dilution of the undiluted liquid is carried out such that, where R1 is defined as an average secondary particle diameter of the abrasive grains in the undiluted liquid and R2 is defined as an average secondary particle diameter of the abrasive grains in the polishing composition, the ratio R2 / R1 is 1.2 or less, wherein R1 and R2 are determined by a dynamic light scattering method, wherein the polishing composition contains 0.002 wt% or more and 0.5 wt% or less of a water-soluble polymer.where the weight-averaged molecular weight of the water-soluble polymer is 1,000 or more and less than 2,000,000.

The present invention addresses the problem of providing a silicon oxide powder that can be used as a negative electrode active material, for lithium ion secondary batteries, which is effective in improving the retention rate of discharge capacity through charge-discharge cycles (cycle characteristics). The silicon oxide powder (which includes metal-element-containing silicon oxide) according to the present invention is a silicon oxide powder expressed as SiOx (0.5<x<1.5), and when the volume-based median diameter of the silicon oxide powder is measured using a laser diffraction particle size measurement device, the median diameter is in the range of 1 μm to 30 μm, and when a dispersion of the silicon oxide powder is passed through a filter having a pore size of 1 μm and the volume-based median diameter of the silicon oxide powder in the dispersion is measured thereafter using a dynamic light-scattering particle size measurement device, the median diameter is in the range of 150 nm to 750 nm.

In a first step S101, the average particle size of a target molecule is measured. The average particle size of the target molecule can be measured by, for example, at least one of measurement by a small-angle X-ray scattering method, measurement by a dynamic light scattering method, and measurement by observation with an electron microscope. Next, in a second step S102, a stimulus-responsive hydrogel is produced using the measured average particle size of the target molecule as the lower limit value of the mesh size of the stimulus-responsive hydrogel.

The application is suitable for the technical field of computer vision, and provides a dynamic optical scattering imaging recovery and displacement prediction method, system and device. The dynamic optical scattering imaging recovery and displacement prediction method comprises: acquiring a second speckle image; extracting motion features of the second speckle image from a time sequence forward sequence and a time sequence reverse sequence respectively through a bidirectional time sequence-phase recurrent neural network, fusing to obtain a third speckle image; and performing frequency domain enhancement on the third speckle image by using phase information in a Fourier domain, and combining a frequency domain attention mechanism to obtain a fourth speckle image. The application realizes robust suppression of speckle noise and cross-frame consistency recovery of texture details in a complex dynamic scene through bidirectional time sequence modeling, sets a frequency domain enhancement module to improve phase spectrum expression capability, and further enhances the structural consistency of a reconstructed image.

The invention provides an optimization method for ultrafiltration purification of tumor extracellular vesicles, and belongs to the technical field of tumor extracellular vesicles. The optimization method comprises the following steps: determining an optimal ultrafiltration membrane combination by establishing an ultrafiltration membrane molecular weight cut-off matrix; preparing a tumor cell supernatant subjected to serum-free culture; constructing an extracellular vesicle yield vector, and calculating a stable and variable development matrix to determine the optimal collection time; after pre-filtering, guiding into an ultrafiltration system for vesicle separation; dynamically optimizing ultrafiltration parameters by applying a vesicle purification network diagram model and a minimum spanning tree algorithm; further purifying the vesicles through density gradient centrifugation; and evaluating the quality of the vesicles by adopting a dynamic light scattering technology in combination with the vesicle identification auxiliary model, and performing parameter adjustment according to quality indexes. Wherein the vesicle identification auxiliary model is based on a deep learning architecture, the feature fusion weight is dynamically adjusted through a temperature adaptive mechanism, and accurate evaluation of vesicle purity and intelligent adjustment and optimization of process parameters are realized.

An aqueous personal care rinse off composition is provided, comprising: a dermatologically acceptable aqueous vehicle; a dermatologically acceptable cleaning surfactant; and a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles that are partially or completely encapsulated by a wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide and mixtures thereof; wherein the metal oxide particles have a z average particle size of >100 nm as measured by dynamic light scattering; wherein the wax has a melting point temperature of 50 to 110° C.; and wherein the composite opacifier particles have a z average particle size of >100 nm to 2,000 nm as measured by dynamic light scattering.