56 results about "Magnetic nanowires" patented technology

The invention provides a method for preparing a magnetic nanometer array and transferring the magnetic nanometer array to a metal substrate. The method includes the steps that a secondary anode oxidation method is utilized to prepare an aluminum oxide porous die plate which is not through, magnetic nano materials are deposited in holes of the die plate, the length of a deposited nanowire is controlled to make a certain unfilled depth reserved in the holes of the die plate, metal is deposited on the surface of the die plate, a continuous metal film with the nano holes is formed, thermocompression bonding is conducted on the continuous metal film and the metal substrate under certain temperature and pressure, and eventually the die plate is dissolved, and the goal of transferring the magnetic nanowire to the metal substrate is achieved. The method is simple in process and convenient to operate, compatible with the micro-electronic processing process, particularly, low-temperature bonding is achieved by the utilization of the nanoscale effect of a formed porous nanometer metal film layer, and the method has wide application prospect in the field of manufacturing of magnetic sensors based on a micro electro mechanical system.

The invention discloses a composite material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a metal ion solution with a concentration of 0.01 to 1 mol / L, adding a complexing agent and a nucleating agent, regulating a pH value to be 10.0 to 13.5 by virtue of an alkaline solution, and preparing a solution A, wherein the metal ions are magnetic metal ions or a mixture of magnetic metal ions and nonmagnetic metal ions; S2, preparing 0.1 to 3 mol / L of reducing agent solution with strong reducing property, regulating the pH value of the alkaline solution to be 10.0 to 13.5, and preparing a solution B; S3, sufficiently mixing the solution A and the solution B, reacting at 50 to 100 DEG C and under a magnetic field condition of 0.005 to 1T, , ending the reaction before the agglomeration phenomenon, and preparing a reaction stock solution containing magnetic nanowires or alloy nanowires; and S4, compounding the reaction stock solution prepared in step S3 and a polymer. The preparation method is simple in preparation process, and the prepared composite material has the characteristics of excellent performance and low cost.

The invention relates to the field of air purification, and discloses a magnetic electret fiber air purifying and filtering material and a preparation method. The preparation method comprises the following preparation processes: (1) preparing metal ion solutions of ferric salt, cobalt salt and nickel salt; (2) adding into a mixed solution of cyclohexane, n-amyl alcohol, cetyl trimethyl ammonium bromide and oxalic acid to form a microemulsion, and calcining to prepare magnetic nanowire powder; (3) adding the magnetic nanowire powder, inorganic electret nanoparticle titanium dioxide, silicon dioxide and a polar polymer into a solvent to prepare electrostatic spinning fluid; and (4) performing electrostatic spinning on a non-woven fabric to prepare the magnetic electret fiber air purifying and filtering material. The magnetic nanowire added in the prepared magnetic electret fiber material not only enhances the initial potential but also slows down the attenuation of surface potentials, amagnetic field enables the material to keep surface potential for a long time in damp air, the magnetic field decay is extremely slow, the capture capacity of the material to particulate matters is enhanced, and the service life of the material is prolonged.

The invention discloses a preparation method of a magnetic nanowire, and belongs to the field of nervous system repair and nano-structure preparation. The preparation method of a magnetic nanowire comprises the following steps: 1, synthesizing magnetic nanoparticles with ferroferric oxide cores and a silicon dioxide coating; 2, constructing a static magnetic field, and the direction of the static magnetic field can be regulated and controlled at any angle in a two-dimensional plane; and 3, dropping the magnetic nanoparticles monodispersion liquid containing the Matrigel matrigel onto a slide in the static magnetic field, assembling the magnetic nanoparticles through the static magnetic field to form the magnetic nanowire, and fixing the linear structure of the magnetic nanowire through the Matrigel matrigel.

The invention discloses a preparation method of a one-dimensional magnetic nanowire array with an ultrahigh axial remanence ratio. An alumina template with uniformly-distributed through holes is prepared by using a two-time anodic oxidation method, and then, direct-current electrodeposition is carried out to prepare the magnetic nanowire array. In the electrodeposition process, a layer of silver as a cathode is sputtered on one side of the alumina template, a metal to be plated is used as an anode and placed in a plating tank, and a metal salt solution to be plated, contained in the plating tank, is used as a plating solution. A set voltage is added between the cathode and the anode, the current in a circuit is controlled at a constant value, then electrodeposition is carried out, and the deposition time is set according to the length of a required nanowire, thus the nanowire array growing in a template hole is obtained. By using the method, the nanowire array with an ultrahigh axial remanence ratio can be prepared, and meanwhile, good controllability can be achieved in the deposition process.

The invention synthesizes a nickel ferrite magnetic nanocomposite material by two steps. Firstly, an ordered mesoporous SBA-15 is adopted as a template, the mesoporous nickel ferrite magnetic nanowire is synthesized by a nanometer copy method, and then the ordered nickel ferrite magnetic nanocomposite material is synthesized by an impregnation method. The magnetic nanocomposite material has a significant exchange biasing field (HEB) and a large coercive force (Hc). According to the nickel ferrite magnetic nanocomposite material, depending on the exchange biasing effect of antiferromagnetic and ferrimagnetic interfaces, super paramagnetic phenomenon of the nanometer material can be well inhibited, and application of the nanometer material in the fields of magnetic recording and spin electronic devices is facilitated.

The invention relates to a preparation method for reticular samarium-cobalt multilayer magnetic nanowires, which comprises the following steps: preparing a polycarbonate (PC) film template containing a 3D reticular structure channel by using a high-energy heavy ion beam, and preparing net (SmCo)1-xCux / Cu nanowires by using a pulse electrodeposition technology. The obtained nanowires are of a mutually connected reticular structure and can be directly used as a magnetic nano-device; and secondly, by introducing a non-magnetic nano-layer Cu, the demagnetization coupling interaction of samarium cobalt is enhanced, and the comprehensive magnetic performance of the samarium cobalt nanowires is improved.

The invention discloses a preparation method of a Nd-Fe-B magnetic nanowire array. The preparation method comprises the following steps: neodymium chloride (NdCl3.6H2O), ferrous chloride (FeCl2.4H2O),boric acid (H3BO3) and de-ionized water are mixed to prepare NdFeB alloy solution; a complexing agent is added to obtain depositing liquid, wherein the complexing agent is glycine (NH2CH2COOH), ammonium chloride (NH4Cl) and ascorbic acid (C6H8O6); and graphite is used as an anode, an AAO template is used as a cathode, the Nd-Fe-B depositing liquid prepared in the last step is electrolyte, and a direct-current voltage-stabilization power supply is used for electrochemical deposition to finally obtain Nd-Fe-B ternary alloy magnetic nanowires. The obtained nanowires are high in number and deposition rate, arranged in parallel, ordered in height, uniform in diameter and higher in length-diameter ratio.

The present invention relates to a biomolecular measurement system (1), which enables to measure the intermolecular forces arising from the interaction between two biomolecules or the intramolecular forces within a single biomolecule by using an atomic force microscope (AFM). In the present invention, the cantilever (2) is moved only when the actuator (4) moves the magnetic nanowire (3) and thus moves the molecule attached to the end of the magnetic nanowire (3). Since the cantilever (2) is not moved, fluctuation and disturbance is not created in the liquid containing the biomolecules. Thus, the measurements are made more accurately and with higher resolution. Additionally, by means of the actuator (4), the biomolecules are enabled to be moved upon exertion of magnetic force at any coordinate on x, y and z axes on the nanowire (3), or exertion of torque on two axes.

The invention discloses a preparing method of a one-dimensional Co<x>Fe<3-x>O4 magnetic nano wire with a component gradient. The preparing method includes: separately putting FeCl3 powder and CoBr2 powder into a first heating zone of a tube furnace according to a mole ratio of 2:1, putting a substrate into a second heating zone with the FeCl3 powder being put between the CoBr2 powder and the substrate and the distance between the FeCl3 powder and the CoBr2 powder being 5-8 cm, adjusting the temperature of the first heating zone of the tube furnace to be 700-950 DEG C and the temperature of the second heating zone to be 800-1000 DEG C, feeding a carrier gas into the tube furnace, maintaining the temperature for 2-3 h, cooling the tube furnace to the room temperature and taking the substrate out, thus obtaining the one-dimensional Co<x>Fe<3-x>O4 magnetic nano wire with the component gradient with the x being 0.05-0.25. According to the preparing method, the one-dimensional Co<x>Fe<3-x>O4 magnetic nano wire with the component gradient and a large area is prepared under the combination of temperature control and the distance between the substrate and a source substance.

A substrate-integrated waveguide H-plane self-bias isolator of a soft magnetic nanowire array relates to a microwave device. The invention includes a SIW transmission line and four ordered soft magnetic nanowire array strips placed in the transmission line. The SIW transmission line includes a dielectric substrate. The dielectric constant of the dielectric substrate material is between 8-16, the upper surface and the lower surface of the dielectric substrate are respectively provided with metal layers, and two rows of parallel conductive through holes arranged in the dielectric substrate form the two through hole sides of the waveguide. ; The ordered soft magnetic nanowire array strip is strip-shaped, arranged between the substrate and the surface metal layer, and attached to the upper and lower surface metal layers, the long side of the ordered soft magnetic nanowire array strip and the two channels of the waveguide The hole sides are parallel, the spontaneous magnetization direction of the two ordered soft magnetic nanowire array strips near the waveguide side is upward, and the spontaneous magnetization direction of the two ordered soft magnetic nanowire array strips near the other side of the waveguide is downward. The invention has the advantages of small volume, simple structure, easy processing and easy integration with planar microwave circuits.