103results about "Magnetic liquids" patented technology

The present disclosure relates to compositions, assemblies, systems and methods for surface finishing, e.g., smoothing and polishing electrically conductive parts (e.g., metals or metal parts), e.g., via ion transport by means of said compositions, also referred herein as Magnetic Dry Electrolytes (MDEs), comprising free solid bodies retaining a liquid electrolyte used in combination with magnetic particles and / or magnetic fields. Thereby, the free solid bodies retaining the liquid electrolyte may be made magnetically active. The presence of the magnetic particles and / or magnetic fields presents a wide range of possible application, e.g., regarding the control and synchronization of the electrically conductive free solid bodies motion, packing factor and the electrochemical pulses and properties of the particles and the surface treatment, e.g., surface finishing, on which they are used, including the smoothing and polishing of electrically conductive parts, e.g., metal parts, for example punches, gears or inner channels (e.g., metal parts with inner channels).

The invention relates to the technical field of vehicle-mounted visual perception, in particular to a camera active anti-shake cooling system based on a magnetorheological fluid medium and a control method. The heat dissipation system comprises a camera module, at least three independent pipelines which are arranged around the camera module and are hollow inside, a hydraulic driving unit, at least one electromagnetic coil which is arranged on the outer wall of the independent pipeline and is used for generating a controllable magnetic field, and a controller, the controller is used for cooperatively controlling the liquid pressure in the pipeline and the magnetic field intensity acting on the magnetorheological fluid according to the vehicle state information and / or the posture information of the camera module so as to achieve active anti-shake and heat dissipation of the camera module. The pressure of the cooling liquid in the pipeline is adjusted to support the camera and change the electromagnetic force between the magnetic fluid and the coil by changing the magnetic field intensity, and lens shaking is reduced in cooperation with a vehicle body active shock absorption system.

The utility model discloses an electromagnetic coil, a magneto-rheological shock absorber and an automobile. The electromagnetic coil comprises an iron core and an excitation wire. The iron core is sleeved outside the sliding end, and a wire slot is annularly formed in the peripheral side of the iron core; the excitation wire is wound in the wire slot to form an excitation coil, and the cross section of the excitation wire is in a flat geometric shape; the magnetorheological damper comprises the electromagnetic coil and is applied to an automobile. In the scheme of the utility model, after the excitation lead is wound into the excitation coil, the gap between each turn of lead and the gap between the external lead of the excitation coil and the slot wall of the wire slot are greatly reduced, under the condition that the space of the wire slot is not changed, the number of turns of the coil can be increased by using the flat excitation lead, and the utilization rate of the space in the wire slot is higher; the effective working length of the electromagnetic coil is larger, the maximum damping force of the magneto-rheological shock absorber can be improved, the electromagnetic efficiency is greatly improved, and large damping force can be generated only through small current.

This invention belongs to the field of tertiary oil recovery technology, specifically relating to a CO2-switched magnetically driven nanoparticle, its preparation method, and its application. The magnetically driven nanoparticles are silica-coated Fe3O4 nanoparticles. The surface of the silica coating is further modified with amidine groups to act as CO2 switches. These CO2 switches cause the hydrophilicity of the magnetically driven nanoparticles to increase with the increase of CO2 solubility in the solution in which they are located. This invention integrates emulsification and demulsification functions through the CO2 switch loaded on the surface of the magnetically driven nanoparticles. Furthermore, the particles can be recycled using their own magnetic response, reducing costs. This nano-displacement agent can solve the problems of poor efficiency, ineffective oil-water separation, high economic costs, and environmental impact associated with existing displacement agents.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

Provided is a magnetic viscous fluid and a mechanical device that improve both the excitation time resistance and the rubber resistance. The magnetic viscous fluid of the present invention contains magnetic particles and a base oil, and the base oil contains an ester-based base oil and a nonpolar base oil, and the nonpolarity index of the base oil is in the range of 10 to 45.

The invention belongs to the field of functional materials, and discloses a high-mass-fraction magnetorheological fluid and a preparation method thereof. The magnetorheological fluid comprises the following components in percentage by mass: 40%-50% of spherical carbonyl iron powder of 1-10 [mu] m, 2%-4% of a composite thixotropic agent, 0.5%-1% of a surface modified molybdenum disulfide nanosheet anti-wear agent, 1%-2% of a surfactant, 0.1%-0.2% of a small molecular surface energy regulator, 0.5%-2% of an organic gelator and the balance of carrier fluid. The preparation method comprises the following steps: performing dry mechanical fusion on the magnetic particles, the thixotropic agent, the anti-wear agent and the surfactant under the protection of inert gas, and introducing the small molecule regulator before ball milling to form core-shell structure composite powder; and adding the powder into a preheated carrier liquid containing an organic gelator in batches, shearing and dispersing, cooling to trigger in-situ gelation, and finally, carrying out vacuum defoaming to obtain the product. Through cooperation of the components and the process, the settling resistance, redispersibility and wear resistance of the magnetorheological fluid are remarkably improved, and the problems that the magnetorheological fluid is prone to hardening and rapid in performance attenuation under high concentration are solved.

The invention discloses a rack cold plate magneto-rheological flow channel edge AI cooperative heat dissipation control method and device, and relates to the technical field of cold plate heat dissipation control. The invention discloses a rack cold plate magnetorheological flow channel edge AI collaborative heat dissipation control method and device, and the method comprises the steps: S1, collecting edge thermal control state data, and carrying out the preprocessing of the edge thermal control state data; s2, identifying a thermal variation unit, constructing a thermal load cluster, evaluating a cooling regulation priority of the thermal variation unit, and generating a thermal load space partition; s3, constructing a high thermal response unit set, evaluating the magneto-rheological regulation response intensity of the high thermal response units, and generating regional regulation strategies in a grading manner; s4, driving microstructure deformation, electromagnetic excitation and flow regulation; and after execution, evaluating the regulation response hysteresis, and if the hysteresis exceeds the standard, correcting the control instruction and re-driving the execution. The problems that heat dissipation is uneven and cooling resources are wasted due to the fact that a traditional structure cannot dynamically regulate and control flow and thermal resistance under severe fluctuation of chip thermal load are solved.

Provided is a silicone composition comprising: (A) a magnetic fluid which comprises (A1) magnetic particles, (A2) a first surfactant, (A3) a second surfactant and (A4) water; (B) a polyether-modified silicone oil which has an oxyalkylene structure having an EO ratio of 40% or more; and (C) a curable organopolysiloxane. In the silicone composition, the blending amount of the component (A4) is 0.1-40 parts by mass with respect to 100 parts by mass of the component (C).

A temperature-sensitive magnetic fluid that realizes a cooling device with higher cooling performance and a magnetic fluid drive device that uses the temperature-sensitive magnetic fluid are provided. [Solution] The thermosensitive magnetic fluid 1 includes a composite 13 formed by combining a thermoresponsive gel 11 and magnetic nanoparticles 12. The composite has a structure in which the magnetic nanoparticles are encapsulated in the thermoresponsive gel or a structure in which the magnetic nanoparticles are adsorbed on the surface of the thermoresponsive gel.

The invention discloses a preparation method of high-temperature magnetic slurry for an inductor capable of being formed at low pressure, and relates to the technical field of electronic component materials. Magnetic powder is pretreated through a coupling agent, a uniform molecular layer can be formed on the surface of the magnetic powder, the acting force between the magnetic powder and organic molecules of a glue solution is improved, dispersity is enhanced, and eddy-current loss is reduced; the epoxy resin system with a specific ratio uniformly coats the magnetic powder by means of a high-speed rotation mode of a homogenizer, and can be converted into a viscous flow state after being heated, so that the magnetic powder has excellent warm-pressure fluidity, improves the magnetic density through pressing, can be matched with a curing agent to be rapidly cured, can be stably formed under the low pressure of 30-50 MPa, and avoids coil damage and magnetic core cracking; and the method is suitable for preparation of complex-structure composite inductors.

The present invention provides a magnetic viscous fluid comprising a magnetic particle, base oil, an inorganic cation exchanger with a siloxane bond, and silicone oil. A difference A−B between a solubility parameter A of the base oil and a solubility parameter B of the silicone oil is 1.3 (cal / cm3)1 / 2 or more.

(A) A silicone composition comprising a magnetic fluid containing (A1) magnetic particles, (A2) a first surfactant, (A3) a second surfactant, and (A4) water, (B) a polyether-modified silicone oil having an oxyalkylene structure and an EO ratio of 40% or more, and (C) a curable organopolysiloxane, wherein the blending amount of component (A4) is in the range of 0.1 to 40 parts by mass per 100 parts by mass of component (C).

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.

The application relates to the field of cable production, and particularly discloses a mining cable production stranding device, which comprises a support, a pay-off turntable, a parallel-wiring die and multiple pay-off wheels, the pay-off turntable is rotationally connected with the support, the parallel-wiring die is arranged on the discharging side of the pay-off turntable, and the multiple pay-off wheels are uniformly and interval distributed along the circumference of the pay-off turntable, and the stranding device further comprises a lead wire disc coaxially connected with the pay-off turntable, multiple self-adapting wire guide mechanisms corresponding to the multiple pay-off wheels are arranged on the lead wire disc, the lead wire disc outputs lead wires to the parallel-wiring die through the self-adapting wire guide mechanisms, and the self-adapting wire guide mechanisms can adjust the guide angle and the bending radius of the lead wires. The application has the effect that the guide angle and the bending radius of the lead wires output by the lead wire disc can be adjusted.

A composition having high dispersibility of a magnetic particle to have storage stability and a heat transport device using the composition. The composition contains a particle and an aqueous medium including water. The particle contains a magnetic particle and a dispersant including polyacrylic acid or a salt thereof.

The invention discloses an ultra-large current inductor component and a preparation method thereof, and relates to the field of inductors. The inductor component is formed by co-sintering blocks, each block comprises a middle layer, each middle layer is formed by stacking a plurality of diaphragms, each diaphragm comprises a material sheet, a filling layer and an electrode, and each filling layer is formed by printing filling slurry on the surface of the material sheet; the filling slurry comprises polyvinyl butyral resin, dioctyl phthalate, a dispersing agent, a solvent and magnetic powder. The filling slurry is used for filling the height difference existing after electrode printing, the flatness of the lamination surface is improved, the filling slurry adopts the middle-molecular-chain polyvinyl butyral resin, the toughness and the strength after curing are improved, the interlayer binding force of the lamination is jointly improved by adding the dioctyl phthalate, and the bonding strength of the lamination surface is improved. The lamination tearing and falling probability is reduced in the subsequent lamination and cutting process, the initial internal stress can be resisted in the co-firing stage, cracks, internal cracks and other defects are reduced, the product yield is increased, and the electrical performance is improved.

To provide a magnetoviscous fluid that can achieve both high reliability and high excitation stress even when used at low or high temperatures, and a braking device equipped with such a magnetoviscous fluid. [Solution] A magnetorheological fluid comprising metal magnetic particles modified with an ionic liquid modification site containing a first cationic group and a first anionic group, and an ionic liquid dispersion medium containing a second cationic group and a second anionic group, wherein the first cationic group and the second cationic group are of the same type and are selected from the group consisting of quaternary ammonium ions, imidazolium ions, pyridinium ions and phosphonium ions, and the first anionic group and the second anionic group are selected from the group consisting of tetrafluoroborate ions, hexafluorophosphate ions, trispentafluoroethyltrifluorophosphate ions, bis(trifluoromethanesulfonyl)amide ions, hydrogen phthalate ions and bissulfurylimide ions.

A magnetoactive material is provided. Devices comprising a magnetoactive component with the magnetoactive material are also provided. The magnetoactive component comprises a plurality of multiphasic magnetoactive particles configured to selectively exhibit a swarming pattern when a magnetic force field is applied. Each particle comprises a first phase comprising a first colorant and at least one additional phase distinct from the first phase so that each particle has optically distinct phases. At least one of the first phase or the at least one additional phase comprises a material capable of magnetization and receptive to the magnetic force field. The device may further comprise a magnetic component for selectively generating the magnetic force field directed towards the magnetoactive component. The swarming pattern may be initially encoded and fully reversible, to enable programmable dynamic display, non-volatile and semi-volatile memory, Boolean logic, and information encryption functions in soft, wearable devices among others.

A permanent fluidic magnet device includes a carrier fluid, and a plurality of non-Brownian nanomagnets disposed within the carrier fluid in a three-dimensional (3D) oriented and ramified magnetic (ORM) network structure. The permanent fluidic magnet device can be utilized in a system for detecting biomechanical signals from a subject, for example, cardiac signals, acoustic signals, etc. The permanent fluidic magnet device can also be implemented in a liquid robot system where the permanent fluidic magnet device can be actuated by an external magnetic field.

An inductive device with flux paths through a substrate may be made by depositing a malleable magnetically permeable material into a hole in the substrate and curing the malleable magnetically permeable material to form a substantially solid magnetic plug. Deposition of the malleable magnetically permeable material may comprise stencil-printing followed by use of a flexible runner. A uniform extension of the plug above an outer surface of the substrate may be provided by a spacer on the outer surface. The spacer may, e.g., be a conductive layer and / or a non-conductive material on the surface. Magnetic plates spanning two or more plugs may form a closed magnetic flux path. A plug may be surrounded by a winding on a layer of the substrate. Extension of the plug above an outer surface of the substrate may ensure the integrity of an essentially gap-free connection between the end of the magnetic plug and a mating surfaces of a magnetic plate. The plug may be reduced for co-planarity with the substrate surface, or to form a recess below the substrate surface, e.g. to form controlled gaps in the permeable medium.

The invention discloses an asphaltene deposition prevention system based on a magnetic fluid barrier, and relates to the field of oil and gas exploitation and pipeline transportation, the asphaltene deposition prevention system comprises a pipeline body used for transporting asphaltene-containing crude oil, and the pipeline body is an oil pipeline, preferably a metal pipeline / non-metal pipeline with a smooth inner wall; the magnetic field generation module is used for generating a magnetic field gradient pointing to the center of the pipeline from the pipe wall in the inner wall area of the pipeline body; the magnetic fluid supply module is used for supplying magnetic fluid into the pipeline body, the pipe diameter of the pipeline body is selected according to actual requirements, and the magnetic field generation module adopts an annular array formed by neodymium iron boron permanent magnets and is fixed to the outer wall of the pipeline through an adjustable mechanical support. The magnetic fluid is driven by the magnetic field gradient to form a stable physical isolation layer on the inner wall of the pipeline, so that asphaltene is effectively prevented from being in contact with the pipe wall, and dependence on chemical agents and mechanical cleaning is reduced.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. When a cobalt ferrite precursor is treated at a high temperature and a high pressure, an oxidation reaction is caused in the presence of a complexing agent, thereby obtaining intended cobalt ferrite magnetic particles.

The invention discloses a magnetic force rheological polishing solution containing graphene coated CIP composite particles and a preparation method of the polishing solution. The polishing solution comprises the following components in percentage by mass: 8-20% of rod-like mesoporous silica, 10-20% of graphene coated CIP composite particles and the balance of deionized water. 3%-10% of graphene coated CIP composite particles; 3%-10% of abrasive particles; 1%-3% of an additive; 65%-85% of polyethylene glycol; the average diameter of the rod-like mesoporous silica is 50nm-200nm, and the length-diameter ratio of the rod-like mesoporous silica is (3: 1)-(10: 1); the graphene-coated CIP composite particle is of a composite structure in which a reduced graphene oxide shell wraps a carbonyl iron powder CIP core; the average particle size of the graphene-coated CIP composite particles is 3-5 [mu] m, and the shell thickness of the reduced graphene oxide is 10-50 nm. The polishing solution can realize continuous and stable high-viscosity thickening performance, inhibits aggregation of magnetic particles, and has good oxidation resistance and suspension stability.

This invention discloses a shock-resistant relay, relating to the field of relay technology. It includes a base body with an electromagnetic system assembly mounted on its top. In use, the shock-resistant pad isolates the electromagnetic system assembly and the shock-absorbing plate from the base body, absorbing some of the vibration energy. Vibration energy is dissipated through the viscous friction of a liquid magnetorheological fluid. The negative Poisson's ratio honeycomb panel has a negative Poisson's ratio honeycomb structure, with highly elastic silicone rubber filling the honeycomb cells to disperse the impact load transmitted by the base body. Through the tensile effect, it achieves three-dimensional vibration energy absorption. A piezoelectric ceramic sheet converts mechanical vibration into electrical energy to power the excitation coil, achieving "self-harvesting of vibration energy." After the excitation coil is energized, the magnetorheological fluid transforms into a near-solid-state damping layer, improving the shock resistance in complex vibration environments. Dynamic shock absorption is achieved through the switching between liquid and solid states of the magnetorheological fluid.

A magnetorheological fluid utilizing properties of thixotropic agents and having well-balanced sedimentation properties includes: a magnetic material; a medium to allow the magnetic material to be dispersed therein; and at least one dispersant selected from sepiolite and smectite or a dispersant including sepiolite and bentonite.

The invention discloses an intelligent portable fixed type anti-falling device for a transformer, and relates to the technical field of transformers, the intelligent portable fixed type anti-falling device for the transformer comprises a transformer body, a locking assembly and an early warning protection assembly, and the lower surface of the transformer body is symmetrically connected with a plurality of fixing supports. A passive buffering system is formed by a limiting plate and magnetorheological fluid, energy is dissipated and connection fatigue is reduced in daily vibration, when the risk of falling occurs, a strain gauge senses deformation, an electromagnetic coil is instantly activated after intelligent judgment of a control module, and the fault point can be accurately positioned. The magnetorheological fluid is solidified to form rigid support, falling is effectively intercepted, automatic reset is achieved after the risk is relieved, installation verification, vibration suppression, active falling prevention and self-recovery are integrated, and the intrinsic safety and reliability of high-altitude transformer operation are remarkably improved.

Provided are: a method for producing composite particles in which seed particles and cobalt ferrite particles can be synthesized with relatively low energy, the composite particles having a particle diameter within a specific range, having a circular shape with a predetermined average circularity, and having specific magnetic characteristics; composite particles of seed particles and cobalt ferrite particles manufactured by this manufacturing method have a circular shape having a predetermined average circularity, have specific magnetic properties, and have uniform particle diameters. The provided method for manufacturing composite particles of seed particles and cobalt ferrite particles comprises: a step in which a ferrous salt and a cobalt salt are stabilized by a complexing agent in an aqueous solution to prepare a ferrite precursor; a step in which spherical or substantially spherical seed particles are added to the ferrite precursor; and a step in which the ferrite precursor is additionally heat-treated.

The embodiment of the invention provides a magneto-rheological suspension platform, a suspension device, a battery cell processing method and a battery cell processing device. The magneto-rheological suspension platform comprises a supporting base, a supporting structure and a workbench, the supporting base is provided with a fluid containing groove and magnetorheological fluid filled in the fluid containing groove. The supporting structure comprises a shell, a fluid channel and a sliding assembly, wherein the fluid channel and the sliding assembly are arranged in the shell. The first end of the fluid channel is communicated with the fluid containing groove, the second end of the fluid channel is connected with the first end of the sliding assembly, and the second end of the sliding assembly penetrates through the shell to be connected with the workbench. The magnetorheological fluid in the fluid channel controls the sliding assembly to move in the axial direction of the shell under the action of a magnetic field so as to provide suspension support for a battery cell material or other materials on the workbench to adapt to stress changes of the materials in the machining process.

Aspects of the invention include a computer peripheral device comprising an input element that operates based on a performance characteristic, an electropermanent magnet (EPM) assembly including a permanent magnet configured to generate a magnetic field and a magnetizing assembly configured to set an intensity of the magnetic field generated by the permanent magnet, and a magnetorheological (MR) material coupled to the input element. The MR material has a viscosity that changes based on the magnetic field and affects the performance characteristic of the input element.