95 results about "Dynamic light scattering" patented technology

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 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.

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.

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.

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.

The present invention refers to a pharmaceutical formulation comprising: a) a hydrophobic peptide or protein; b) a water-soluble organic surfactant selected from the list consisting of non-ionic surfactants, anionic surfactants, amphoteric surfactants, amino acids, amphipathic glycosides, water-soluble polymer compounds and tertiary amino compounds; wherein a) and b) are dispersed in a salt solution forming a colloidal suspension having particles having an average particle size of less than 100 nm cumulant radius as measured by dynamic light scattering, wherein the salt solution comprises a Tris buffer, a Sodium Bicarbonate buffer, or a mixture thereof; wherein the pH of the composition is in the range of between 7.37 to 10, preferably between 7.5 and 10, more preferably between 8.5 and 10, and wherein the formulation is suitable for parenteral administration.

Provided are surface-treated sol-gel silica particles or the like which have little change in charge when the environment changes, and which can impart good printing characteristics to a toner when used as an external additive for the toner. Surface-treated sol-gel silica particles having R2SiO3 / 2 units and R43SiO1 / 2 units (R2 and R4 are monovalent hydrocarbon groups) on the surface, satisfying (1) to (7) (1) a median diameter as determined by a dynamic light scattering method of 50 nm to 300 nm, (2) an average circularity of 0.80 to 1.0, (3) a refractive index of 1.380 to 1.420, (4) a true density of 1.7000 g / cm < 3 > or more and less than 1.9000 g / cm < 3 >, (5) a volume resistivity of 1011 Omega cm or more, and (6) a ratio represented by water vapor adsorption specific surface area / nitrogen adsorption specific surface area of 2.00 to 10.0. And (7) the moisture absorption rate when exposed at 30 DEG C / 90% RH for 2 hours is 6.0-11 mass% with respect to the dry mass when dried at 150 DEG C for 1 day.

The present invention is a composition comprising a) an aqueous dispersion of polymer particles optionally functionalized with a phosphorus acid monomer and having a z-average particle size as measured using dynamic light scattering in the range of from 50 nm to 500 nm; b) a salt of iodic acid; c) a C8-C10-alkyl phosphate or sulfate; with the proviso that when the polymer particles are not functionalized with the phosphorus acid monomer, the composition further comprises d) a hydrotrope. The composition of the present invention provides a way of preserving a latex against microbial growth in the absence of a biocide.

The present disclosure describes a method and apparatus for measuring dynamic light scattering of a sample. In one embodiment, the apparatus includes a platen, a light source located below the platen and configured to emit luminescence through the platen and into the sample, collection optics located below the platen and configured to capture scattered light, and a light absorber configured to contact the sample, absorb transmitted light, and redirect reflected light away from the collection optics. In one embodiment, the method includes placing the sample on the platen, emitting luminescence from the light source below the platen through the platen into the sample, capturing the scattered light with the collection optics below the platen, contacting the sample with the light absorber, absorbing the transmitted light with the absorber, and redirecting the reflected light away from the collection optics with the absorber.

The application belongs to the technical field of biology, and discloses a ferritin expression and purification method in bacillus subtilis, wherein the food safety level strain bacillus subtilis WB600 is used as a host, and the synergistic regulation of expression element (promoter, signal peptide) screening, bottom strain (dltD gene knockout, csaA molecular chaperone gene overexpression) modification and induction condition (induction time, temperature, IPTG concentration) optimization is used to successfully realize the high-efficiency secretory expression of Japanese capsule prawn ferritin (MjFer) and H-2 type soybean ferritin (H-2). The transmission electron microscope and dynamic light scattering analysis prove that the two proteins both retain the typical cage structure of ferritin, and the iron oxidation precipitation and reduction release experiment proves that the two proteins retain the basic iron oxidation precipitation and reduction release characteristics of ferritin, which is helpful for the large-scale production of ferritin in the food industry.

To provide a method for producing a polyether compound having a reactive silicon group, capable of improving filterability in a purification process.SOLUTION: A process for producing a reactive silicon group-containing polyether compound, which comprises converting a hydroxy group of a hydroxy group-containing polyether compound in a composition containing the hydroxy group-containing polyether compound and a double metal cyanide complex catalyst to a reactive silicon group-containing group represented by the following formula 1, wherein the double metal cyanide complex catalyst is in the form of particles, and the 50% cumulative light intensity particle size determined from a cumulative particle size distribution on a light intensity basis in a range of from 0.1 to 6.5 μm obtained by dynamic light scattering particle size distribution measurement of the composition, is at most 1.0 μ m: SELECTED DRAWING: None

The invention discloses an autocorrelation curve time gradient difference algorithm for improving particle size inversion resolution in dynamic light scattering, which comprises the following steps of: inverting particle size distribution through an autocorrelation curve in a DLS (Digital Light Scattering), and when an original autocorrelation function matrix A is constructed, calculating an autocorrelation function data vector X of the original dynamic light scattering; performing first-order difference operation processing by applying time gradient difference operation, generating a new time gradient difference vector X ', and generating a new time gradient difference matrix; and applying the reconstructed time gradient difference vector X'and the time gradient difference matrix to a DLS inversion algorithm to calculate and obtain high-resolution particle size distribution. The method has the advantages that the morbidity of the DLS inversion problem is reduced, an original attenuation curve is converted into a curve with obvious peak value characteristics, and the peak value positions corresponding to different particle sizes are obviously different, so that components with similar particle sizes are more easily distinguished in the inversion calculation, the double-peak and multi-peak particle size resolution is effectively improved, and the accuracy of the DLS inversion calculation is improved. The minimum double-peak particle size ratio can reach 1.5 times.

The present invention relates to a composition containing a polyether compound and a composite metal cyanide complex catalyst, wherein the composite metal cyanide complex catalyst is in the form of particles, and the 50% cumulative light intensity-based particle size of the composition determined from the cumulative particle size distribution of a light intensity reference in the range of 0.1-6.5 μm as obtained from a dynamic light scattering particle size distribution measurement is 1.0 μm or less.

Provided is a dimethicone-treated zinc oxide powder which is highly water repellent and dispersible in an oil agent and which can be used to prepare a cosmetic material with excellent ultraviolet ray shielding capability and visible light transmittance. Also provided is a composition containing the dimethicone-treated zinc oxide powder.　The dimethicone-treated zinc oxide powder according to the present invention is obtained as a result of treating a zinc oxide powder with dimethicone, and is characterized as follows. The ratio Tt550 / Tt370 of the transmittance Tt550 of light having a wavelength of 550 nm to the transmittance Tt370 of light having a wavelength of 370 nm, where transmittance is determined using a spectral transmittance curve measured using a specific dispersion coating film, is 10 or more. In a specific acid resistance test, the pH is 6.5 or less. Alternatively, the particle size at cumulative 90% in a volume-based particle size distribution measured by dynamic light scattering is 550 nm or less. The composition according to the present invention is characterized in that the dimethicone-treated zinc oxide powder according to the present invention is blended with an oil agent.