73 results about "Paramagnetism" patented technology

The invention belongs to the technical field of cerium-based rare earth oxide dispersibility testing, and particularly relates to a method for evaluating cerium-based rare earth oxide particle surface characteristics and slurry dispersion stability. Comprising the following steps: when cerium-based rare earth oxide particles are synthesized, adding a paramagnetic element as a probe, and mixing the synthesized particles with a dispersing agent and water to obtain mixed slurry; nuclear magnetic resonance scanning is adopted, the body water relaxation peak and the particle surface bound water and body water exchange dynamic relaxation peak of the mixed slurry in each stage of the process from uniform mixing to standing layering are measured, and the particle surface characteristics are evaluated based on the relaxation efficiency; meanwhile, a linear relation between the relaxation peak area proportion and the sedimentation time in the standing layering process is constructed, a fitting slope value is obtained, and the dispersion stability of the mixed slurry is evaluated. According to the method, non-intrusive in-situ detection of the dispersion stability of the cerium-based rare earth oxide particle slurry is realized by innovatively using a low-field nuclear magnetic resonance mode, and accurate comparison and evaluation of the dispersion stability can be realized.

The invention relates to the technical field of shale exploitation, and discloses a shale reservoir wettability dynamic determination method, which comprises: S1, selecting a shale plunger core, carrying out supercritical CO2 cleaning and vacuum drying, and carrying out high pressure saturation by using simulated crude oil to obtain an initial oil saturation; and S2, the saturated rock core is loaded into a high-temperature and high-pressure rock core holder, and under the simulated formation temperature and pressure condition, simulated formation water containing the paramagnetic contrast agent is injected at the constant flow speed for displacement till the water content of the outlet end reaches 98%. According to the invention, dynamic and three-dimensional space representation of wettability is realized: three modal data of nuclear magnetic resonance, resistivity and sound wave are synchronously acquired in the displacement process, so that the limitation of a traditional static method is overcome, and the dynamic process of the wettability changing along with the fluid saturation state can be captured in real time; and finally, a high-resolution three-dimensional wettability distribution map is generated, and non-uniform distribution of wettability in the core is visually revealed.

The invention provides a paramagnetic micro-nano magnetic particle magnetophoresis separation device and a paramagnetic micro-nano magnetic particle magnetophoresis separation method, and relates to the technical field of micro-nano magnetic particle separation and magnetic labeled biomolecule separation analysis. The separation device comprises a plurality of permanent magnets which have the same magnetism and the same size and are arranged above the separation channel at intervals in the direction of the separation channel, and a plurality of sets of mechanical structures which respectively drive each permanent magnet to move up and down in the vertical direction; the Hall sensor clings to the separation channel and is used for detecting the magnetic induction intensity at the separation channel; a liquid inlet device; a UV / Vis ultraviolet-visible light detector; a collection device and a computer. The magnetic induction intensity in the separation channel can be set, the critical diameter of the micro-nano magnetic particles capable of being captured by the magnetic field is determined, magnetophoresis separation of paramagnetic micro-nano magnetic particles is accurately achieved, the controllability of the magnetophoresis separation process is enhanced, and the separation effect of the micro-nano magnetic particles is improved.

Systems and methods are provided for separating or filtering magnetic nano scale particles (e.g., such as dysprosium (Dy), iron (Fe), yttrium (Y), cobalt (Co), nickel (Ni), and others) at the industrial scale with minimum energy consumption. A continuous, scalable flow system can be applied equally to the separation of paramagnetic particles and diamagnetic particles. The system can be continuous in the sense that the fluid can be continuously circulated through the separation chamber and, depending on the operating conditions, may not require multiple separation steps. At the same time, the system can be scaled up to industrial applications to separate magnetic particles from a large volume of fluids, for example at a rate of a few cubic meters per hour (m3 / hr).

A probe for use with a tank having a wall pierced by an orifice and configured to contain a fluid containing paramagnetic particles. The probe comprises a magnet, a displacement system arranged at the orifice to displace the magnet from a capturing position in which the magnet is bathed in the fluid to a checking position in which the magnet is outside of the tank, and a seal ensuring the seal-tightness of the orifice in the transition from the capturing position to the checking position and vice versa.

An object of the present application is to provide a magnetic particle including a secondary particle in which a plurality of primary particles are aggregated, each primary particle having a particle diameter deemed to exhibit superparamagnetism, and the secondary particle exhibiting a larger particle diameter. [Solution] This object is achieved by magnetic particles including secondary particles in which a plurality of primary particles are aggregated, in which the secondary particles have an average particle diameter of 500 nm or more and 5000 nm or less, and in which the plurality of primary particles have an average particle diameter of 2 nm or more and 20 nm or less.

This invention discloses a method for enhancing the uranium separation efficiency of commercial iron powder using an external field, comprising: adding commercial iron powder to a reactor containing fluorine- and uranium-containing wastewater; applying an external weak magnetic field or magneto-optical coupling; and performing uranium separation treatment on the fluorine- and uranium-containing wastewater under continuous stirring. This invention magnetizes the commercial iron powder by introducing a weak magnetic field, thereby attracting Fe... 2+ Migration disrupts the passivation layer on the surface of iron powder, promoting the reaction of U(VI) with Fe. 0 The redox reaction simultaneously strengthens the affinity between the magnetized iron powder particles and the paramagnetic O2 molecules, leading to the formation of γ-FeOOH nanosheets with a high specific surface area on the iron powder surface. The γ-FeOOH surface is rich in oxygen-containing functional groups, which achieve U(VI) separation through the bonding of -OH groups with U(VI). This invention, based on a weak magnetic field, further improves the separation efficiency of commercial iron powder for U(VI) in fluoride- and uranium-containing wastewater by coupling with an optical field.

A kind of abrasive particle multi-parameter on-line monitoring device and method, belong to mechanical equipment wear monitoring technical field, including inductance monitoring module, imaging monitoring module, paramagnetic magnetophoresis separation device, collection cleaning device, system processor.Inductance monitoring module detects the magnetic field disturbance generated when abrasive particle passes, obtains the size, number and ferromagnetic property of abrasive particle, is transmitted to system processor;Imaging monitoring module is triggered according to the inductance pulse signal of inductance monitoring module by system processor, and the shape and size information of abrasive particle are obtained by imaging abrasive particle;Paramagnetic magnetophoresis separation device is used to separate paramagnetic and diamagnetic abrasive particle, and is connected with collection cleaning device.The present application can obtain the information of multiple abrasive particles simultaneously, has the advantages of anti-bubble interference, high response sensitivity, can distinguish paramagnetic and diamagnetic, can multiple information authentication, etc.;The specific occurrence site of mechanical fault and its severity, wear mechanism can be analyzed and confirmed, to ensure that equipment is safe and efficient operation.

The invention relates to a needle assembly and a system including the same. A needle assembly includes a needle including an elongate shaft having a diameter dimensioned for insertion into an intravenous catheter, an outer surface, a distal tip, and a proximal end, at least a portion of the elongate shaft having a first magnetic region and a discontinuity located in the first magnetic region, the discontinuity provides a region of increased diameter relative to the diameter of the elongate shaft, the discontinuity comprising a magnetic adhesive wherein a first magnetic region is placed at a known location at a fixed distance from the distal tip, the magnetic field strength and vector of the first magnetic region being detected by a magnetometer, the first magnetic region and the second magnetic region are positioned to provide a position of the distal tip of the elongate shaft based on the position of the first magnetic region and the corresponding fixed distance, where the magnetic adhesive increases a diameter of the elongate shaft, where the magnetic adhesive is disposed on an outer surface of the elongate shaft, and where the adhesive includes an additive selected from the group consisting of paramagnetic additives, ferromagnetic additives, and combinations thereof.

The utility model relates to the technical field of neutron scattering, in particular to a neutron scattering sample environment device. The neutron scattering sample environment device comprises a first container, a second container and a connecting piece, the first container and the second container are provided with inner cavities, the inner cavities are used for being filled with paramagnetic materials, and the first container and the second container are used for being arranged at the first end and the second end of a sample tube respectively and are provided with heat conduction faces making contact with the sample tube to conduct heat. The connecting piece is connected between the first container and the second container so as to clamp and fix the sample tube. According to the neutron scattering sample environment device, the containers are provided with the inner cavities for containing the paramagnetic materials, the two containers are located at the two ends of the sample tube respectively and clamp and fix the sample tube, and the containers make full contact with the sample tube, so that heat conduction is facilitated; the whole device is put into a superconducting magnet, and the paramagnetic material is magnetized and demagnetized, so that an ultralow-temperature environment can be provided for a sample in the sample tube.

This invention discloses a magnetic array-enhanced non-metallic alkaline water hydrogen production electrolyzer, which is constructed by stacking and sealing anode plates, cathode plates, and electrolytic bipolar plates with gaskets and diaphragms layer by layer. Each anode plate, cathode plate, and electrolytic bipolar plate includes a non-metallic frame, a graphite liner, a cylindrical permanent magnet array, and nickel foam electrodes. The magnet array is positioned between the graphite liner and the nickel foam electrodes. The electrolytic bipolar plates and end plates enclose an electrolysis chamber, and the number of bipolar plates can be increased or decreased as needed. This invention utilizes a cylindrical permanent magnet array to construct a high-field, strong gradient magnetic field, leveraging oxygen paramagnetism to achieve efficient bubble desorption and enhance the oxygen evolution reaction rate. A star-shaped flow field structure fills the gaps in the magnet array, optimizing electrolyte distribution and enhancing mass transfer efficiency, effectively improving the hydrogen production performance and electrolysis efficiency of the electrolyzer.

[Problem] To provide a superparamagnetic tunnel junction element and a computing system using same, the tunnel junction element having excellent operation stability (robustness) against an external magnetic field and being suitable for the computing system based on probabilistic computing. [Solution] This superparamagnetic tunnel junction element 10 comprises a first ferromagnetic layer group 14 including a ferromagnetic material, a second ferromagnetic layer group 12 including a ferromagnetic material, and a barrier layer 13 disposed between the first ferromagnetic layer group 14 and the second ferromagnetic layer group 12, wherein: the first ferromagnetic layer group 14 includes a 1-1st ferromagnetic layer 14A_1, a 1-2nd ferromagnetic layer 14A_2, and a first non-magnetic bonding layer 14B_1; the 1-1st ferromagnetic layer 14A_1 is composed of a ferromagnetic material, and the magnetization direction thereof varies with a first time constant; the first time constant is one second or shorter; and the first non-magnetic bonding layer 14B_1 contains at least one among Ru, Ir, Rh, Cr, and Cu.

To provide: a fine particle which has superparamagnetism and which does not deteriorate when brought into contact with water; and a production method thereof.SOLUTION: A fine particle (1) according to the present invention includes γ-Fe2O3(5) contained in a matrix phase (3) containing SiO2. In the fine particle, an atom ratio (Si / Fe) between a silicon atom derived from SiO2 and an iron atom derived from γ-Fe2O3 is preferably 0.050 to 0.500, a coercive force is preferably 480A / m or less, and a saturation magnetization is preferably 40A m2 / kg or more.SELECTED DRAWING: Figure 1

The present invention provides an EMI shielding device including a flame retarding, thermal interface material composite with a through plane thermal conductivity of no less than 30 W / mK and a dielectric withstanding voltage of no less than 1 kV / mm, where the composite includes at least one dielectric layer of self-aligned, carbon-based materials associated with superparamagnetic particles and at least one layer of fillers including a blend of dielectric heat transfer materials with a thermal or UV curable polymer or phase change polymer. The anisotropic heat transfer carbon-based materials associated with superparamagnetic materials are aligned under a low magnetic field strength of less than 1 Tesla to an orientation that results in a high thermal conductivity direction which can conduct the maximum heat from the adjacent device of the present composite. The present invention also provides a method for preparing the composite.

The application is based on a cement-based material original state pore measurement method based on low-field magnetic resonance longitudinal relaxation technology, which overcomes the technical bottlenecks of traditional magnetic resonance test methods in signal acquisition integrity, rapid relaxation signal capture and longitudinal surface relaxation strength determination by optimizing the acquisition and processing technology of longitudinal relaxation signals, and realizes the accurate detection of the pore structure of cement-based materials from the nanometer scale to the micron scale. Compared with the traditional transverse relaxation method, the method of the application is not disturbed by paramagnetic substances when testing ferrosilicate cement-based materials, and has higher applicability and accuracy. Overall, the application can non-destructively, accurately and accurately characterize the pore distribution characteristics of cement-based materials without drying pretreatment of the sample, providing a scientific basis for optimizing the performance of cement-based materials and improving the level of engineering quality control, and effectively promoting the further development of pore structure test technology in the fields of building engineering and material science.

A wafer testing cassette is provided. The wafer testing cassette includes a first housing, a second housing and a magnetic force generating assembly. The first housing include a probe card, the probe card includes at least one probe having a paramagnetic property. The second housing is combined with the first housing and has a magnetic force generating assembly arranged corresponding to the at least one probe. A wafer located in the second housing, and the at least one probe electrically contacts at least one pad of the wafer with a predetermined contact force. When the magnetic force generating assembly is configured to generate a first magnetic attraction force, the magnetic force generating assembly attracts the at least one probe, so that the at least one probe electrically contacts the at least one pad with a first contact force which is greater than or equal to the predetermined contact force.

The application discloses an OPM-based superparamagnetic nanoparticle relaxation signal detection system and method. The detection system comprises a magnetic nanoparticle module, an OPM array and a magnetic field generation module in a magnetic shielding environment, and a magnetic field control module and a data acquisition module connected therewith outside the magnetic shielding environment. The magnetic nanoparticle module is placed in a controllable magnetic field region of the magnetic field generation module to wait for magnetization, the OPM array receives the relaxation signal generated after the particle magnetization, and the magnetic field generation module is used for generating a particle magnetization field and a background field inside; the magnetic field control module receives a magnetic field module instruction of a host computer, and supplies power to the magnetic field generation module through a constant-voltage power supply; the data acquisition module is connected with the OPM array to collect the relaxation signal, simultaneously receives a magnetic field mode signal generated by the magnetic field control module, and transmits data back to the host computer. The application improves the particle magnetization device, and suppresses the magnetization background noise from the hardware.

In one aspect, a method of extracting a target analyte from a sample for introduction into a mass spectrometer is disclosed, which includes mixing the sample with a paramagnetic medium to form a mixture, subjecting the mixture to a magnetic field gradient to form a non-homogenous distribution of at least one of the analyte and at least one interfering component of the sample, if any, thereby enhancing a concentration of the target analyte within a spatial location of said mixture, extracting at least a portion of the target analyte from that spatial location, and introducing at least a portion of the extracted target analyte into said mass spectrometer.

The invention belongs to the field of environmental monitoring, and discloses a preparation method of a nickel-based electrode with a spin pinning effect and application of the nickel-based electrode in chemical oxygen demand detection. A nickel substrate is subjected to ultrasonic treatment through hydrochloric acid and an organic solvent, cleaned and dried, a precursor layer is formed on the surface of the nickel substrate through an electro-deposition method or a hydrothermal method or an impregnation method, the precursor layer is converted into an antiferromagnetic or paramagnetic metal oxide layer through oxidation treatment, and the electrode with the spin pinning effect is prepared. The electrode is used as a working electrode in COD detection, under the action of an external magnetic field, a three-electrode system is used for electrochemical detection, and rapid and accurate determination of COD in a water body is realized. The preparation method of the nickel-based electrode with the spin pinning effect has the advantages of being simple and easy to operate and suitable for large-scale production, the stability and sensitivity of COD detection are further improved, and an efficient and reliable novel method is provided for water COD detection.

An energy harvesting device mainly consists of a high-potential metal, a low-potential metal, and multiple electrode spacings. The high-potential metal is composed of a ferromagnetic material disposed at an odd number of positions, and multiple high-charge particles exist within the ferromagnetic material. The low-potential metal is composed of a paramagnetic material disposed at an even number of positions, and multiple negatively charged particles exist within the paramagnetic material for collecting electron conduction. The high-potential metal and the low-potential metal have different potentials, creating a potential difference. The high-potential metal and the low-potential metal work together to capture an external time-varying magnetic field from the surrounding environment. This external time-varying magnetic field drives the high-charge particles to flow towards the negatively charged particles, forming electron transitions to generate electrical energy. After the low-potential metal reaches electron saturation, it outputs electrical energy.

The invention discloses an abrasive particle multi-parameter online monitoring device and method, and belongs to the technical field of mechanical equipment wear monitoring, and the abrasive particle multi-parameter online monitoring device comprises an inductance monitoring module, an imaging monitoring module, a parametric diamagnetic magnetophoresis separation device, a collecting and cleaning device and a system processor. The inductance monitoring module detects magnetic field disturbance generated when the abrasive particles pass through, obtains the sizes, the number and the ferromagnetic properties of the abrasive particles and transmits the sizes, the number and the ferromagnetic properties to the system processor; the imaging monitoring module is triggered by the system processor according to the inductance pulse signal of the inductance monitoring module to image the abrasive particles and obtain the shape and size information of the abrasive particles; and the paramagnetic and diamagnetic magnetophoresis separation device is used for separating paramagnetic and diamagnetic abrasive particles and is connected with the collecting and cleaning device. According to the invention, information of a plurality of abrasive particles can be obtained at the same time, and the method has the advantages of bubble interference resistance, high response sensitivity, capability of distinguishing paramagnetism, capability of multi-information verification and the like; the method can analyze and confirm the specific occurrence part, the severity and the abrasion mechanism of the mechanical fault, and guarantees the safe and efficient operation of the equipment.

The invention relates to the field of magnetic resonance imaging. The invention relates to a nanovector comprising: - an external layer comprising a plurality of amphiphilic molecules, said amphiphilic molecules comprising at least one hydrophobic moiety linked to at least one hydrophilic moiety, and - a core comprising at least one organometallic complex having a paramagnetic property that can be activated by oxidation, said organometallic complex being functionalized by at least one hydrophobic moiety, the oxidation of the organometallic complex being controllable by light. The invention also relates to a method of magnetic resonance imaging.

The invention relates to an axial flux motor made of paramagnetic material, the rotor and the stator of which consist of respective discs carrying opposite permanent magnets of opposite polarity and having a certain inclination, thereby generating tangential repulsive force components causing the rotor to make an angular movement. The motor has specific features including an adjustment device for adjusting the relative position between the two discs forming the rotor and the stator so that the start and stop of the motor and the different rotational speeds provided by the motor can be controlled.

The utility model discloses magnetic density separation equipment for classifying electronic waste particles, which relates to the technical field of electronic waste treatment and comprises a bottom plate, and four supporting legs and two supporting plates are fixedly connected to the upper surface of the bottom plate. Superconducting magnets fixed to the supporting legs at the corresponding positions and a plurality of rotating rods rotationally connected with the supporting plates at the corresponding positions are arranged above the bottom plate. According to the device, various metals mixed in electronic wastes can be effectively separated at the same time through the paramagnetism of the magnetic fluid and the density difference of different metals, compared with other traditional schemes, the process steps are greatly shortened, and compared with a traditional method depending on chemical reagents or high-temperature smelting, physical separation does not need to use strong acid, cyanide or high temperature, and the cost is reduced. Separation is achieved only through physical fields such as a magnetic field and water flow, so that emission of toxic waste water and waste gas is remarkably reduced, the environmental protection treatment cost of enterprises is reduced, and meanwhile workers are prevented from making direct contact with heavy metal and harmful chemical substances.

An electromagnetic material for an inductance for operation at cryogenic temperatures including, in an electrically insulating matrix, metal nanoparticles with superparamagnetic behavior of size less than or equal to 30 nm and having a magnetic permeability greater than or equal to 1.5 for a frequency between 5 GHz and 50 GHz.

The application provides a method for simultaneously improving the magnetic performance and mechanical performance of a neodymium-iron-boron magnet. In the rapid solidification stage, paramagnetic nanorod-shaped refractory particles are uniformly added and mixed into the neodymium-iron-boron alloy liquid by high-pressure injection, thereby obtaining alloy powder doped with the paramagnetic nanorod-shaped refractory particles, so that the paramagnetic nanorod-shaped refractory particles can be randomly distributed between the main phase grains of the sintered neodymium-iron-boron alloy, thereby generating rod-shaped second-phase substances in situ in the grain boundary phase, isolating the demagnetization coupling effect between the main phase grains, and improving the coercivity. In the application, the rod-shaped phase distributed between the main phase grains of the neodymium-iron-boron alloy can hinder the propagation of cracks, delay the transmission rate of cracks by using its dispersed distribution and refractory characteristics, and consume the energy transmission inside the magnet, thereby simultaneously improving the mechanical performance of the magnet along the magnetization axis and the non-magnetization axis direction, and increasing the material strength and toughness.

The invention discloses a magnetic field enhanced electrochemistry mediated amine regeneration system and method.The magnetic field enhanced electrochemistry mediated amine regeneration system comprises an electrolytic tank, an anode and a cathode of the electrolytic tank are both copper electrodes, an electrolyte is a to-be-regenerated ethylenediamine (EDA) solution absorbing CO2, and a cathode area and an anode area of the electrolyte are separated through an anion exchange membrane; and the magnet is used for applying a magnetic field to the anode and the cathode of the electrolytic tank. Magnetic fields are applied to the anode and the cathode of the electrolytic tank, the magnetic fields can change the migration direction of paramagnetic copper ions, the diffusion rate of the copper ions is improved, and reaction kinetics is optimized. Compared with an electrochemically mediated amine regeneration system without a magnetic field, the magnetic field enhanced electrochemically mediated amine regeneration system provided by the invention has higher electrochemical reaction activity and lower working voltage, and the reaction energy consumption is effectively reduced.