358results about "Magnetic liquids" patented technology

The invention discloses a non-contact magnetoelectric composite current sensor with magnetism gathering and magnetic shielding. A sensor core is composed of a magnetoelectric sensing element, a magnetofluid layer, a magnetism gathering structure and a magnetic shielding layer. The magnetoelectric sensing element is made of manganese-doped lead magnesium niobate and amorphous alloy film composite materials, the outer side of the sensing element is coated with a magnetofluid layer made of soft magnetic composite materials, the magnetism gathering structure is made of permalloy materials with high magnetic conductivity and is divided into an upper part and a lower part, the upper part accommodates the sensing element and the magnetofluid layer, and the lower part accommodates the magnetic gathering structure. And the lower part is provided with a standardized groove for placing a conductor to be tested. The outermost layer is a magnetic shielding layer composed of multiple layers of nanocrystalline alloy strips, the vertical split type design is also adopted, and it is ensured that the magnetic shielding layer is tightly matched with the magnetic gathering structure through precision machining. The upper magnetic shielding layer and the lower magnetic shielding layer are detachably connected, and field installation is facilitated. The overall structure is compact, a circuit does not need to be disconnected during installation, and the device is especially suitable for on-line current monitoring requirements in the fields of smart grids, industrial automation and the like.

According to the reconfigurable flexible pressure sensor based on the magnetic ionic liquid drops and the preparation method of the reconfigurable flexible pressure sensor, the superparamagnetic nanoparticles and the ionic liquid drops are combined to prepare the magnetic ionic liquid drops which are high in fluidity and can be magnetically controlled, and the magnetic ionic liquid drops serve as a pressure sensitive layer of a pressure sensing device; and the flexible stretchable pressure sensor based on the magnetic ionic liquid drop array is constructed. The invention also provides a distributed / combined non-contact multi-element in-situ reversible reconstruction method of the flexible pressure sensor, and an external magnetic field is utilized to control the magnetic ion liquid drops in the sensor to carry out programmable low-resistance rapid movement and deformation between the super-hydrophobic interconnected microfluid channel and the chamber array. The spatial distribution, component / volume and geometrical shape changes of the magnetic ionic liquid drops in the array are regulated and controlled, and distributed / combined non-contact multi-element in-situ reversible reconstruction of the flexible stretchable pressure sensor in the performances of spatial resolution, sensitivity, detection limit, pressure response mode and the like is realized through one or more change combinations.

The invention relates to the technical field of intelligent materials, in particular to low-temperature-resistant magnetorheological fluid and a preparation method thereof.The low-temperature-resistant magnetorheological fluid is prepared from, by weight, 60-75 parts of magnetic particles; 3 to 15 parts of modified magnetic particles; 10-25 parts of low-temperature-based carrier liquid, which comprises 40-60% of silicone oil and / or mineral oil, 20-30% of synthetic ester and 10-20% of poly-alpha-olefin; 0.1 to 1.0 part of a dispersant; 0.5 to 2.0 parts of an anticoagulant; wherein the modified magnetic particles are prepared by coating magnetic particles with SiO2 aerogel and grafting the coated magnetic particles with fluorine-containing silane; the preparation method comprises the steps that magnetic particles are sequentially subjected to silane coupling agent treatment, aerogel deposition and fluorine-containing silane gas-phase grafting, and modified magnetic particles are prepared; carrying out ultrasonic mixing on the base carrier liquid and an anticoagulant at 40-60 DEG C for 30 minutes; adding magnetic particles, modified magnetic particles and a dispersing agent, dispersing by adopting a micro-jet homogenizer, and then carrying out gradient cooling treatment. The low-temperature-resistant magnetorheological fluid has the effect of improving the low-temperature-resistant performance of the magnetorheological fluid.

The invention discloses an efficient light guide mounting bracket matched with a solar photovoltaic panel, which comprises an equipment base, a photovoltaic panel, a Fresnel lens, a magnetic field generator and a temperature difference generator, and is characterized in that the equipment base is fixedly connected with a rotating mechanism, and the rotating mechanism is movably connected with an inclination mechanism for adjusting the angle of the photovoltaic panel; a supporting mechanism is movably connected to the upper portion of the rotating mechanism and comprises a fixing support movably connected to the rotating mechanism. Through the wind-resistant mechanism, self-adaption to different wind power environments is achieved, the magnetic field intensity of the magnetic field generator is regulated and controlled, the magnetorheological fluid increases resistance to limit shaking under strong wind and reduces resistance to guarantee flexible rotation in breeze, meanwhile, a Faraday cage formed by the magnetorheological fluid shields electromagnetic interference, a photovoltaic panel is protected against wind power damage, stability of an electrical system is guaranteed, and the service life of the photovoltaic panel is prolonged. And the equipment fault risk is reduced, the service life is prolonged, and the solar photovoltaic power generation system is ensured to continuously and stably operate in a complex outdoor environment.

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 invention aims to provide a novel magnetic coupling agent, and relates to paste which is beneficial to improving magnetic permeability of a magnetic circuit and reducing magnetic resistance of a contact surface and is used for related magnetic circuit contact surfaces of a mutual inductor, a transformer, a magnetic sensor and the like. According to the coupling agent, the characteristics of high physical and chemical stability, high Young modulus and high specific surface area of a graphene material are utilized, high-magnetic-conductivity paste is developed, the coupling agent has the advantages of being high in temperature stability, proper in hardness, high in friction performance, high in magnetic conductivity and the like, and the multi-purpose application function can be achieved. Due to the characteristic, the problems of efficiency reduction and system stability reduction caused by poor magnetic circuit contact are effectively solved, so that the overall performance and reliability are improved.

The invention discloses a colored magnetic particle preparation method, a colored magnetic particle, a magnetic microcapsule and a magnetic film, and relates to the technical field of magnetic particle preparation. According to the preparation method, ferric salt and an alkaline substance are adopted, a ferroferric oxide precursor precipitation solution is generated through a coprecipitation method, surface modification is conducted through oleic acid, the dispersity and stability of particles in an organic system are enhanced, a solvent is adopted for washing and drying, and the purity and chemical stability of the particles are further improved; subsequently, mixing the modified nano ferroferric oxide, a dye, a high polymer and a functional additive to obtain the colored magnetic particle. The method has the advantages that the preparation process is simple, and the prepared colored magnetic particles are excellent in dispersity, stability and functionality.

A smart variable inductor based on magnetorheological materials comprises an "EE"-shaped iron core, two DC control coils, one AC coil, and a magnetorheological material gap. The magnetorheological material gap is located on the central column of the "EE"-shaped iron core. The two DC control coils and the AC coil are wound around the two side columns and the central column of the "EE"-shaped iron core, respectively. By controlling the DC current in the DC control coil, the magnetic saturation of the side columns can be changed, thus achieving intelligent wide-range adjustment of the inductance of the AC coil. The beneficial effects of this patent are: the provided smart variable inductor based on magnetorheological materials, due to the higher permeability of magnetorheological materials than air, which decreases with increasing magnetic field strength, has advantages such as a wide inductance adjustment range and low diffusion flux. When used in LLC resonant converters, it can achieve intelligent wide-range adjustment of input / output voltage and load, as well as intelligent current sharing control in multi-parallel converters.

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).

The present invention discloses a special cable for charging piles, which belongs to the field of cable technology, and includes a cable body and a circulation pump assembly. The cable body is composed of a conductive inner core body, a shielded heat exchange body and a magnetic fluid conversion hardened body from the inside to the outside. The magnetic fluid conversion hardened body includes a wrapping layer and a plurality of heat exchange tubes arranged in a spiral winding. A heat exchange conductive liquid is arranged inside the heat exchange tube, and a magnetic fluid is densely arranged outside the heat exchange conductive liquid. The present invention arranges a magnetic fluid conversion hardened body on the outer layer of the cable body. In the storage state, the heat exchange conductive liquid is pressure-free and the magnetic fluid is in a fluid state. In this state, the magnetic fluid conversion hardened body is in a flexible state, which is convenient for winding and plugging and unplugging charging operations. In the charging state, the heat exchange conductive liquid generates pressure under the action of the circulation pump, and the magnetic fluid solidifies under the action of the magnetic field generated by the current of the heat exchange conductive liquid, which can significantly improve the compression resistance of the cable and effectively avoid the cable from being damaged in the charging and use state.

The invention relates to the technical field of microcapsules, provides a magnetic microcapsule capable of preventing particle sedimentation, a preparation method of the magnetic microcapsule and a magnetic film, and aims to solve the problems of low writing smoothness and poor trace durability due to particle sedimentation and aggregation in the prior art. The magnetic microcapsule comprises a wall material and a core material, the wall material is a mixture comprising an anionic polymer and a cationic polymer, and the core material is a mixture comprising magnetic particles, non-magnetic particles, an oily solvent and a suspension stabilizer; the suspension stabilizer comprises any one or more of phthalic ester, polyamide wax, polysiloxane, sorbitan oleate, sorbitan monostearate, silicon dioxide, magnesium aluminum silicate and magnesium lithium silicate; according to the invention, magnetic particles and non-magnetic particles can be prevented from settling and gathering, and writing fluency and trace durability are ensured.

The invention discloses a flexible motor. The flexible motor comprises a housing; the stator assembly is arranged in the shell; the outer rotating sleeve is rotationally connected into the shell, and a rotor assembly is arranged on the outer side of the outer rotating sleeve; the inner rotating shaft is rotationally connected into the outer rotating sleeve, a first clutch assembly is arranged between the bottom of the inner rotating shaft and the bottom side of the shell, a second clutch assembly is arranged between the inner rotating shaft and the outer rotating sleeve, the top end of the inner rotating shaft upwards extends out of the outer rotating sleeve and the shell, and the top end of the inner rotating shaft is rotationally connected with an output rod along the axis in the horizontal direction; a transmission assembly is arranged between the output rod and the outer rotating sleeve, and when the outer rotating sleeve rotates, the inner rotating shaft can be driven to rotate through the transmission assembly, and through control over the first clutch assembly and the second clutch assembly, the output rod can rotate along the axis of the output rod so as to output power; or the inclination angle can be adjusted according to use requirements so as to achieve the purposes of autorotation, reciprocating swinging or supporting and the like.

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).

Provided is a magnetorheological rotating load apparatus and a control method therefor, the magnetorheological rotating load apparatus including a housing, a yoke fixed in the housing, a shaft mounted to rotate in the housing, at least one rotating ring connected to the shaft to rotate in conjunction with the rotation of the shaft, a coil disposed in the housing, and a magnetorheological fluid filled in at least a portion of the housing, wherein at least a portion of the shaft positioned inside the housing is made of a non-magnetic material.

The invention relates to a process for moving a droplet from a first location to a second location, which droplet comprises a magnetic material disposed in an aqueous medium. The invention also relates to a droplet assembly comprising a droplet, which droplet comprises a magnetic material disposed in an aqueous medium. Various uses of the droplet assembly are also described.

The invention discloses a low-viscosity high-stability perfluoropolyether-based magnetic liquid and a preparation method thereof, and relates to the technical field of magnetic material preparation, and the preparation method comprises the following steps: preparing composite nano magnetic particles of ferroferric oxide and carbon nanotubes by adopting a chemical in-situ coprecipitation method; coating the composite nano magnetic particles with a perfluoropolyether surfactant; the composite nano magnetic particles are dispersed into the perfluoropolyether oil-based carrier liquid, and the solid content of the composite nano magnetic particles accounts for 5 wt%-20 wt%. Ferroferric oxide and carbon nano tube composite nano magnetic particles are obtained through a chemical precipitation method, the particles are stably dispersed in perfluoropolyether-based carrier liquid under the modification effect of a surfactant, and under the condition of low solid content, the dispersion stability and magnetic field stability of the magnetic liquid are greatly improved; the problem of overheating caused by the fact that high-viscosity magnetic liquid is used for high-rotating-speed sealing is greatly solved.

The disclosed technology relates to a ceramic composition and an article formed therefrom. A ceramic article for radio frequency applications is formed of a ceramic material having a chemical formula represented by: Bi1.0+aY2.0−a−x−2yCax+2yFe5−x−yMIVxVyO12 or Bi1.0+aY2.0−a−2yCa2yFe5−y−zVyInzO12. The ceramic material has a composition such that a normalized change in saturation magnetization (Δ4πMs), defined as Δ4πMs=[(4πMs at 20° C.)−(4πMs at 120° C.)] / (4πMs at 20° C.), is less than about 0.35.

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.

The present invention discloses a method for controlling a magnetic fluid to follow the movement of a music melody by using an electromagnet, which is characterized by comprising the following steps: S1, framing an audio signal; S2, calculating an average volume value of each frame; S3, obtaining a series of average volume values; S4, performing signal decomposition on the series of average volume values ​​by using an empirical mode decomposition algorithm; S5, calculating the first intrinsic mode function IMF obtained after decomposition. 1 All local maxima in S6. Calculate IMF 1 The difference between the length value and the position value of the last local maximum value; S7, judging the opening state of the electromagnet according to the obtained difference. The control method of the present invention can make the movement continuity of the magnetic fluid better and can be applied to the changes of various musical melodies.

The present application provides a method for preparing a perfluoropolyether oil-based cobalt-boron magnetic fluid, which is applied to the technical field of magnetic fluids. The present application synthesizes cobalt boride Co-B magnetic powder by reacting aqueous bis(2-ethylhexyl) succinate sulfonate, sodium bis(2-ethylhexyl) succinate sulfonate and sodium borohydride in an isooctane solution, and then coats the surface of the cobalt boride powder with silica by hydrolysis of ethyl orthosilicate. Perfluoropolyether acyl fluoride is grafted onto the surface of the silica-coated cobalt boride magnetic powder by an amide reaction to improve the compatibility between the cobalt boride magnetic powder and perfluoropolyether oil, thereby preparing a thermodynamically stable perfluoropolyether oil-based Co-B magnetic fluid.

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 invention relates to a magnetorheological fluid and a preparation method and application thereof.The magnetorheological fluid contains polysiloxane surface modified magnetic particles, polysiloxane is obtained by polycondensation of at least one silane with the general formula being X-Si-(OR) 3, X is selected from substituted or unsubstituted alkyl with the carbon atom number being 10-16, and R2 is selected from substituted or unsubstituted alkyl with the carbon atom number being 10-16. R is selected from substituted or unsubstituted alkyl with the carbon atom number of 1-3, and the weight-average molecular weight of polysiloxane is 500-20000. The magnetorheological fluid disclosed by the invention has relatively low zero-field viscosity, relatively high shear yield stress and long-term stability, is particularly suitable for a vehicle damping system, has the capabilities of quick response and damping adjustment, and is beneficial to improving the performance of the damping system and prolonging the service life of the damping system.

The invention discloses inductance magnetic blank composite die-casting forming equipment, and relates to the technical field of powder forming, the inductance magnetic blank composite die-casting forming equipment comprises a mounting table, a control cabinet, a filling unit, a positioning unit and a demolding unit, the mounting table is used for mounting and fixing the control cabinet and the filling unit, the control cabinet is used for controlling the device to start and stop, and the filling unit is used for filling materials; the positioning unit is used for calibrating the position of the lower die so that the upper die can accurately stretch into the lower die for die casting, the demolding unit is used for demolding a finished product to avoid damage to the finished product, and after the lower die is filled with materials through the filling unit and the positioning unit is started by the control cabinet to calibrate the position of the lower die, the materials are subjected to die-casting forming; and a finished product is taken out through the demolding unit, so that the quality problem caused by friction extrusion between the mold and the lower mold in the ejection process is avoided, and the product quality is improved.

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.

The disclosed subject matter relates to magnetorheological emulsions and methods of making and use thereof. For example, disclosed herein are magnetorheological emulsions comprising: a magnetorheological fluid comprising a plurality of magnetic particles dispersed in a non-magnetic carrier fluid; and a plurality of discrete emulsion droplets dispersed in the non-magnetic carrier fluid; wherein each of the plurality of discrete emulsion droplets comprises an emulsifier encapsulating an internal fluid phase; wherein the internal fluid phase and the non-magnetic carrier fluid are immiscible.

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