196results about "Magnetic liquids" patented technology

The invention discloses a magnetofluid type silicon controlled rectifier radiator and a heat dissipation control method thereof. The radiator comprises a silicon controlled rectifier, a magnetic fluid chamber is attached to the outer side of the silicon controlled rectifier, the magnetic pole array is installed in the magnetic fluid chamber, and cooling fins are assembled outside the magnetic fluid chamber. When alternating current is introduced into the cavity where the magnetic fluid liquid chamber is located, the alternating current and the magnetic field interact to generate Lorentz force, the Lorentz force drives the magnetic fluid to form directional eddy current so as to achieve convective heat exchange on the silicon controlled rectifier, and heat absorbed by the magnetic fluid and air are subjected to heat exchange through the cooling fins. Junction temperature out-of-control caused by local hot spots of the silicon controlled rectifier can be solved, secondary damage of mechanical vibration of a heat dissipation system to welding spots is eliminated, and the highest junction temperature area of the silicon controlled rectifier is focused and cooled according to needs.

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.

To provide an industrially practicable manufacturing method of an iron carbonyl powder from which deposits on a surface have been removed and an iron carbonyl powder from which deposits on a surface have been removed by this method, and to provide a magnetic particle comprising an iron carbonyl powder with a surface uniformly coated with a titanium oxide film by the removal of deposits on the surface of the iron carbonyl powder.SOLUTION: A manufacturing method of an iron carbonyl powder includes a step of subjecting an iron carbonyl powder to vacuum treatment at a pressure of 50 Pa or under for 6 hrs or over in a vacuum deaeration atmosphere, followed by a step of atmosphere opening until the pressure of the vacuum deaeration atmosphere becomes at an atmospheric pressure of 1.0×105 Pa in 1 hr or over.SELECTED DRAWING: Figure 1

The invention discloses a high-stability magnetic liquid and a preparation method thereof, and belongs to the field of magnetic fluid nano functional materials related to ships. The magnetic liquid comprises a metal-doped iron oxide nano-particle core, a double-layer surface modification layer composed of oleic acid and a silane coupling agent, and a composite carrier liquid formed by compounding poly-alpha olefin synthetic oil and perfluoropolyether and adding nano-diamond. The preparation method comprises the following steps: firstly, coprecipitating and calcining to obtain metal-doped iron oxide nanoparticles, then carrying out double-layer coating modification, and finally carrying out mixed ball milling, ultrasonic treatment and magnetic separation purification on the metal-doped iron oxide nanoparticles and the composite carrier liquid. The saturation magnetization intensity of the magnetic liquid reaches 92-95 emu / g, the magnetic liquid can work for a long time under the high-temperature working condition, the heat conductivity coefficient is increased by 2-3 times, and the redispersibility is excellent. The problems that a traditional magnetic fluid is low in magnetic performance, prone to failure at high temperature, poor in dispersion stability and the like are solved, and the magnetic fluid is suitable for aerospace, high-end manufacturing, ship propulsion and other extreme scenes.

The disclosure relates to a system (100) for removing heat from a battery pack (102). The system (100) includes a cooling jacket (104) defining a flow path corresponding to an arrangement of battery cells in the battery pack (102), and a ferrofluid coolant configured to flow within the cooling jacket (104) along the flow path. The system (100) further includes a plurality of temperature sensors (106), each positioned in a region associated with a set of cells of the battery pack (102), and configured to detect a temperature of the region. The system (100) further includes a plurality of electromagnets (108), each associated with a temperature sensor, and configured to be activated based on a temperature detected by the associated temperature sensor. Activation of an electromagnet causes movement of the ferrofluid coolant towards the region in which the associated temperature sensor is positioned.

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).

To provide a magnetic viscous fluid composition that has excellent flowability under high shear and excellent anti-settling properties of magnetic particles when the magnetic field is turned off.SOLUTION: A magnetic viscous fluid composition includes magnetic particles, a base oil, a dispersant, organically modified bentonite, a trimethylammonium salt represented by a specific formula, and a betaine compound. The total content of the trimethylammonium salt and the betaine compound, and the respective contents of the trimethylammonium salt and the betaine compound, are specific amounts relative to the total amount of the magnetic viscous fluid composition. The organically modified bentonite includes at least one selected from the group consisting of dimethyldialkylammonium and benzyldimethylalkylammonium having an alkyl group having 16 to 22 carbon atoms, and the mass loss in an ignition loss test is 39.0% or more relative to the total amount of the organically modified bentonite. The content of the organically modified bentonite is specific amount relative to the total amount of the magnetic viscous fluid composition.SELECTED DRAWING: None

Provided is a device sealed with a magnetic liquid. The device includes: a rotary shaft, a tank body, a control unit, a first module, a second module, a magnetic liquid, and a pole-tooth. The first module and the second module are in the same configuration, each consists of an outer shell, a left pole-shoe, an electromagnet, a control wiring, a right pole-shoe, and a circlip. The device includes at least two modular structures; the control unit controls a first electromagnet and a second electromagnet to be magnetized to alternately bear a sealing role.

The magnetorheological fluid comprises an ionic liquid, a basic liquid, magnetic particles and an additive, and is characterized in that the magnetorheological fluid contains imidazole cations, the general formula of the imidazole cations is [R1R2N +] C3H4, R1 is selected from substituted or unsubstituted alkyl with the carbon atom number of 1-10, and R2 is selected from substituted or unsubstituted alkyl with the carbon atom number of 1-10. The magnetorheological fluid disclosed by the invention has excellent sedimentation stability, relatively low zero-field viscosity and relatively high shear yield stress.

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 technical field of magnetorheological fluid preparation, and particularly relates to iron-cobalt nanoparticles, a preparation method of the iron-cobalt nanoparticles and application of the iron-cobalt nanoparticles in magnetorheological fluid. The iron-cobalt nanoparticles contain iron and cobalt, are amorphous and spherical, and have an average particle size of 20-35 nm. The iron-cobalt nano-particles are excellent in magnetization performance, the saturation magnetization of the iron-cobalt nano-particles can reach 220 emu / g, and compared with ferromagnetic nano-particles, the saturation magnetization of the iron-cobalt nano-particles can be improved by 44.7%. Moreover, the magnetorheological fluid prepared on the basis of the iron-cobalt nanoparticles is excellent in performance, the zero-field viscosity of the magnetorheological fluid can be as low as 0.63 Pa.s, and the maximum shear stress corresponding to the shear rate of 0.1 s <-1 > under a 1T magnetic field can reach 68KPa.

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.

This invention relates to the field of magnetic nanomaterials technology, specifically to a preparation process and application of a biomagnetic composite material, comprising the following preparation steps: S1, first, permanent magnet spheres and silane coupling agent are mixed uniformly at room temperature, then nano-PEG / Fe3O4 magnetic fluid, polyurethane, polyethylene glycol, dispersant and crosslinking agent are added at 81-90℃, an external magnetic field is applied and ultrasonic stirring is performed; S2, granulation, washing with water, and drying; S3, first, modified nano-sized natural minerals are added to a polymer emulsion, ultrasonically dispersed to obtain a mixed emulsion, then stabilizers, inorganic fillers and additives are added to the mixed emulsion, stirred uniformly to obtain a functional coating; S4, physical coating and drying; S5, magnetization. This invention has a reasonable process and simple preparation. By leaving complex three-dimensional channels on the surface of the permanent magnet spheres, sufficient channels are provided for loading natural mineral nanoparticles, resulting in a good composite effect between the permanent magnet spheres and natural mineral nanoparticles.

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.

The application discloses an ionic liquid-based magnetic liquid and a preparation method thereof. The ionic liquid-based magnetic liquid comprises a magnetic mesoporous material, a functionalized ionic liquid and a base carrier liquid. The cation of the functionalized ionic liquid is R1R2R3R4N + , wherein R1 is C8-C 20 alkylcarboxylic acid group, R2 is C1-C8 alkyl, R3 is C1-C8 alkyl, and R4 is C1-C8 alkyl. The anion of the functionalized ionic liquid is any one of F ‑ , Cl ‑ , Br ‑ , and I ‑ . The application further provides the preparation method of the ionic liquid-based magnetic liquid. The ionic liquid-based magnetic liquid has good stability, is not easy to volatilize, is not flammable, can be applied to a wide temperature range, and the preparation method is simple and has low requirements on equipment.

Provided are a magnetic fluid composition and a motor with which a magnetic fluid is prevented from scattering even during high-speed rotation while maintaining the function as a fluid. This magnetic fluid composition contains a dispersion medium and magnetic particles each having at least a portion of the surface coated with a dispersant. The dispersion medium contains a base oil and an olefin-based polymer having a kinematic viscosity of 45-1000 mm2 / s at 100°C.

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 application relates to a self-sensing magnetic liquid damping vibration absorber and a preparation method thereof. The self-sensing magnetic liquid damping vibration absorber is used to be installed on the structure to be damped. The self-sensing magnetic liquid damping vibration absorber includes: a shell, an insulating tube, two high charge density parts, two conductive parts, a permanent magnet, and an ammeter. The self-sensing magnetic liquid damping vibration absorber combines power generation indication with vibration reduction based on dynamic double electric layer power generation technology and the second-order buoyancy principle of magnetic liquid, thereby realizing vibration monitoring and vibration reduction at the same time, and is not affected by other environmental factors. It only indicates and reduces vibration, achieving the effect of stable vibration monitoring and vibration reduction.

The invention discloses a composite magnetorheological fluid capable of providing a stable and wide second Newtonian region, which comprises anisotropic magnetic powder, the content of which is 0.05-5% of the total weight of the composite magnetorheological fluid; micron-scale isotropic magnetic powder, the content of which is in the range of 70-90% of the total weight of the composite magnetorheological fluid; the carrier liquid and the additive are added into the carrier liquid, and the content of the additive is the balance of the composite magnetorheological fluid.

A magnetorheological fluid comprises: magnetic particles; at least one selected from ester synthetic oil, ether synthetic oil, and alkylnaphthalene having an alkyl group with 10 to 20 carbon atoms; an inorganic cation exchanger having a siloxane bond; and silicone oil.

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.