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1903 results about "Microwave assisted" patented technology

Microwave-assisted extraction (MAE) is a process of using microwave energy to heat solvents in contact with a sample in order to partition analytes from the sample matrix into the solvent. From: Journal of Chromatography A, 2000.

Thin film deposition using microwave plasma

Embodiments of the present invention generally provide deposition processes for a silicon-containing dielectric layer using an improved microwave-assisted CVD chamber. In one embodiment, a method of processing a substrate in a processing chamber is provided. The method generally includes applying a microwave power to an antenna coupled to a microwave source disposed within the processing chamber, wherein the microwave source is disposed relatively above a gas feeding source configured to provide a gas distribution coverage covering substantially an entire surface of the substrate, and exposing the substrate to a microwave plasma generated from a processing gas provided by the gas feeding source to deposit a silicon-containing layer on the substrate at a temperature lower than about 200 degrees Celsius, the microwave plasma using a microwave power of about 500 milliWatts / cm2 to about 5,000 milliWatts / cm2 at a frequency of about 1 GHz to about 10 GHz.
Owner:APPLIED MATERIALS INC

Perpendicular magnetic recording write head and system with improved spin torque oscillator for microwave-assisted magnetic recording

A microwave-assisted magnetic recording (MAMR) write head and system has a spin-torque oscillator (STO) located between the write pole of the write head and a trailing shield that alters the write field from the write pole. The STO is a stack of layers whose planes lie generally parallel to the X-Y plane of an X-Y-Z coordinate system, the stack including a ferromagnetic polarizer layer, a free ferromagnetic layer, and a nonmagnetic electrically conductive spacer between the polarizer layer and the free layer. In the presence of the write field from the write pole the polarizer layer has its magnetization oriented at an angle between 20 and 80 degrees, preferably between 30 and 70 degrees, with the Z-axis. In the presence of a direct electrical current through the STO stack, the free layer magnetization rotates or precesses about the Z-axis with a non-zero angle to the Z-axis.
Owner:WESTERN DIGITAL TECH INC

Thin-film magnetic head for microwave assist and microwave-assisted magnetic recording method

Provided is a thin-film magnetic head that can stably generate electromagnetic field with a desired frequency, even under the existence of significantly strong write field with frequently reversed direction. The head comprises an electromagnetic-field generating element between the first and second magnetic poles. The electromagnetic-field generating element comprises a spin-wave excitation layer provided adjacent to the first magnetic pole and having a magnetization with its direction varied according to external magnetic fields, for generating an high frequency electromagnetic field by an excitation of spin wave. And a magnetization of the spin-wave excitation layer is biased in a direction substantially perpendicular to its layer surface by a portion of magnetic field generated from the first magnetic pole, and pin-wave excitation current flows in the electromagnetic-field generating element in a direction from the second pole to the first pole.
Owner:TDK CORPARATION

CoFe/Ni Multilayer film with perpendicular anisotropy for microwave assisted magnetic recording

A spin transfer oscillator with a seed / SIL / spacer / FGL / capping configuration is disclosed with a composite seed layer made of Ta and a metal layer having a fcc(111) or hcp(001) texture to enhance perpendicular magnetic anisotropy (PMA) in an overlying (A1 / A2)X laminated spin injection layer (SIL). Field generation layer (FGL) is made of a high Bs material such FeCo. Alternatively, the STO has a seed / FGL / spacer / SIL / capping configuration. The SIL may include a FeCo layer that is exchanged coupled with the (A1 / A2)X laminate (x is 5 to 50) to improve robustness. The FGL may include an (A1 / A2)Y laminate (y=5 to 30) exchange coupled with the high Bs layer to enable easier oscillations. A1 may be one of Co, CoFe, or CoFeR where R is a metal, and A2 is one of Ni, NiCo, or NiFe. The STO may be formed between a main pole and trailing shield in a write head.
Owner:HEADWAY TECH INC

Method for preparing silver nano-wire in large batch

The invention discloses a method for preparing nanometer silver lines in large batch. anhydrous silver nitrate AgNO3 with the concentration of 99.9percent, anhydrous glycol (C2H6O2) of 99.8percent and polyvinylpyrrolidone (PVP, with the molecular weight of 55,000) of 98percent are selected as the raw materials; in a microwave-assisting environment, the method of adopting the glycol to reduce the silver nitrate is adopted to prepare nanometer silver lines in large batch. By replacing the original solvent heating method with the high-heat environment created by microwave, the method not only greatly saves the reaction time but also reduces the preparing costs for the nanometer silver lines. The glycol, a moderate reducer, can slow the reaction, thus providing the time for the growth of nanometer silver lines. The method of the invention is the optimal method for preparing the nanometer silver line according to testing results by comparing the influence of micro strength, precursor concentration and microwave processing time on the appearance and size of the prepared nanometer lines. The method of the invention has low cost, is simple method and easily controlled and has high practical value in the application to the industrial production developing nanometer silver lines.
Owner:溧阳常大技术转移中心有限公司

Magnetic head, magnetic recording method and apparatus for controlling magnetic head with spin torque oscillator in a disk drive

A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.
Owner:HITACHI LTD

Preparation method for graphene quantum dot film

A disclosed preparation method for a graphene quantum dot film comprises the following concrete steps; employing a modified Hummers process to prepare graphite oxide; dispersing graphite oxide in a dispersant, and using a microwave-assisted solvothermal process to prepare graphene quantum dot; and dropwise adding the graphene quantum dot solution on a liner, and performing spinning coating to obtain the graphene quantum dot film. The method is cheap in raw material, simple in equipment and convenient to operate; the obtained graphene quantum dot is good in solubility and uniform in dimension; and the graphene quantum dot film is uniform in thickness and good in electric conductivity, and has considerable application prospect on the aspect of solar cells.
Owner:CHANGCHUN UNIV OF TECH

Perpendicular magnetic recording medium and magnetic storage device

Provided are a magnetic recording medium suitable for use with a microwave assisted magnetic recording head and suitable for such recording and a method for manufacturing the same. A perpendicular magnetic recording medium includes a recording layer including a plurality of magnetic layers. A magnetic layer as an uppermost layer of the recording layer includes three or more of sub-layers each having thickness of more than 0 and 1 nm or less, the sub-layers including a first sub-layer and a second sub-layer to make up a lamination unit layer, the first sub-layer including, as a major element, 50% or more of at least one type of element selected from the group consisting of Co, Fe and Ni, the second sub-layer including, as a major element, an element different from the major element of the first sub-layer. The magnetic layer as the uppermost layer includes a plurality of lamination unit layers having different composition of sub-layers at least one sub-layer among the lamination unit layers and / or a different film thickness of sub-layers at least one sub-layer among the lamination unit layers.
Owner:HITACHI LTD

Rapid metal organic framework molecule synthesis method

A rapid, simple and versatile metal organic framework molecule (MOF) synthesis method particularly adapted to make non-linear MOFs includes heating MOF precursors, such as a metal or metal oxide and an organic ligand, in a microwave oven for a period sufficient to achieve crystallization. Microwave-assisted MOF synthesis yields high quality MOF crystals in a reaction time ranging from about 5 seconds to about 2.5 minutes, compared to hours and days required in conventional solvothermal and hydrothermal methods. In addition, microwave assisted methods provide MOF materials with uniform crystal size and well-defined shape. Further, microwave synthesis of MOFs allows the size and shape of MOF crystals to be tailored for use in a wide range applications by manipulating reaction conditions. Secondary growth processes may also be employed to grow larger crystals using seeds obtained from microwave-assisted synthesis methods.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS

Methods for preparing nanotextured surfaces and applications thereof

A rapid and inexpensive technique for generating nanotextured surfaces is disclosed. The technique involves the (1) creation of regular, nanometer-sized template by microwave assisted hydro- or solvo-thermal treatment of polymer films coated on surfaces followed by (2) coating of a layer of metal, metal oxides, polymers and inorganic materials. The nanometer-sized polymer template could be removed to create regularly shaped, hollow nanostructures (e.g., nano-bottles, nano-bowls, nano-holes etc.).
Owner:THE HONG KONG UNIV OF SCI & TECH

Microwave-assisted magnetic recording head having a current confinement structure

According to one embodiment, a high-frequency magnetic field-assisted magnetic recording head includes a main pole adapted for producing a writing magnetic field, a STO positioned above the main pole, a low-resistance layer positioned above the STO, and a current confinement layer positioned between the low-resistance layer and the main pole, wherein the main pole and the low-resistance layer are adapted for acting as poles for writing data to a magnetic medium in response to a flow of current to the STO positioned therebetween to generate a high-frequency magnetic field which overlaps with the writing magnetic field, and wherein the current confinement layer is adapted for controlling a current density and / or a current density distribution of the current flowing to the STO. Other magnetic recording heads and methods of production thereof are also described according to more embodiments.
Owner:WESTERN DIGITAL TECH INC

Perpendicular magnetic recording write head and system with improved spin torque oscillator for microwave-assisted magnetic recording

A microwave-assisted magnetic recording (MAMR) write head and system has a spin-torque oscillator (STO) located between the write pole of the write head and a trailing shield that alters the write field from the write pole. The STO is a stack of layers whose planes lie generally parallel to the X-Y plane of an X-Y-Z coordinate system, the stack including a ferromagnetic polarizer layer, a free ferromagnetic layer, and a nonmagnetic electrically conductive spacer between the polarizer layer and the free layer. In the presence of the write field from the write pole the polarizer layer has its magnetization oriented at an angle between 20 and 80 degrees, preferably between 30 and 70 degrees, with the Z-axis. In the presence of a direct electrical current through the STO stack, the free layer magnetization rotates or precesses about the Z-axis with a non-zero angle to the Z-axis.
Owner:WESTERN DIGITAL TECH INC

Method and apparatus for microwave assisted processing of feedstocks

The present invention relates to an improved reactor, which allows microwave-assisted processing of feedstocks or mixtures of hydrocarbons, and the operating system thereof, which operates under high temperatures and pressures of hydrogen or other gases, in continuous of batch mode. The invention relates to modifications in the geometric configuration of the reactor to process diverse hydrocarbon feedstocks, with or without the addition of catalysts, in the presence or absence of hydrogen or other gases, forming a system which includes a reaction vessel and associated devices, so as to to allow better transmittance of the radiation onto the feedstock to be processed and guarantee maximum absorption of the microwaves by the the reaction medium irrespective of the composition thereof.
Owner:PETROLEO BRASILEIRO SA (PETROBRAS)

Water repellent metal-organic frameworks, process for making and uses regarding same

Microwave assisted synthesis may be used to produce water-repellent metallic organic frameworks (MOFs) molecules. The water-repellent MOFs contain non-polar functional groups, such as a trifluoromethoxy group, which has a strong water repellent effect. The water-repellent MOF, when exposed to water vapor for one week does not result in a significant X-ray power pattern change. The water-repellent MOFs may be suitable as an adsorbent in many industrial applications, such as gas chromatography.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS

Method and apparatus for continuous flow microwave-assisted chemistry techniques

The invention is a method and associated instrument for microwave assisted chemistry. The invention includes the steps of directing a continuous flow of fluid through a microwave cavity while applying microwave radiation to the cavity and to the continuous flow of materials therein, monitoring the pressure of the fluid in the cavity; and cooling the fluid in the cavity when the pressure exceeds a predetermined setpoint pressure.
Owner:CEM CORP

Novel magnetic Fe / C@ MOF composite absorbent and preparation method thereof

The invention provides a novel magnetic porous metal-organic skeleton (Fe / C@ MOF) composite absorbent and a preparation method thereof. Biomaterials which are extensive in source and low in price are served as the carbon source; the Fe<3+> ions are served as the precursor of the magnetic material; under the microwave-assisted condition, magnetic Fe / C material is quickly synthesized; then, the method of self-assembly layer by layer is adopted, so as to alternately deposit metal central ions and organic ligands on the surface of the magnetic Fe / C material and achieve the in-situ synthesis of the MOF; the magnetic Fe / C@ MOF composite is prepared. The preparation method provided by the invention is simple in the preparation technology; moreover, the prepared magnetic Fe / C@MOF composite has the advantages of large specific surface area, high adsorption capacity, capability of magnetic separation, reutilization and the like. The prepared composite simultaneously has the capability of adsorbing and removing organic dye and heavy metal ions. Therefore, the prepared composite has favorable application prospects in the fields of environmental remediation, wastewater treatment, separation science and the like.
Owner:GUANGXI NORMAL UNIV

Information recording device

Excellent magnetization switching of a magnetic recording medium is promoted in microwave assisted magnetic recording to provide a highly-reliable high-density information recording device. A receded section from an air bearing surface is arranged at an end section in a write track width direction on an FGL laminate film for generating a high-frequency field. Alternatively, a cross section of the FGL laminate film (plane perpendicular to the direction of the flow of the electric current) has an inverted trapezoid shape or has a structure in which the area of the cross section increases with distance from the main pole. Since an excellent recording pattern is formed on the recording medium, areal recording density in the information recording device can be increased, and the reliability can be improved at the same time. As a result, the cost can be reduced.
Owner:HITACHI LTD

Modified field generation layer for microwave assisted magnetic recording

A spin torque oscillator is described in which the conventional Field Generation Layer (FGL) is replaced by a bilayer, one of whose members exhibits perpendicular magnetic anisotropy while the other exhibits conventional in-plane anisotropy. Provided the layer with the perpendicular anisotropy is the one that is closest to the spacer layer, the device is able to generate microwaves at current densities as low as 1×108 A / cm2.
Owner:HEADWAY TECH INC

Method for extracting suaeda salsa flavone and measuring content of flavones in suaeda salsa

The invention relates to a method for extracting suaeda salsa flavone and measuring content of flavone in suaeda salsa. The method comprises the following steps: 1), collecting the suaeda salsa, drying the suaeda salsa and crushing the suaeda salsa; with ethanol as an extractant, soaking the suadeda salsa and carrying out microwave-assisted extracting; filtering; extracting with petroleum ether; transferring the ethanol layer to a macroporous adsorption resin layer; and eluting with water and ethanol aqueous solution sequentially; collecting the eluant, and pressurizing and concentrating the eluant to obtain flavone compound extract; 2), with rutin as a contrast, preparing standard solution with different concentration gradients; measuring the chromatographic peak area at the wavelength of 360nm through a high efficiency liquid chromatography to form flavone content contrast reference; measuring the chromatographic peak area of the to-be-measured solution; obtaining the flavone content of the to-be-measured solution according to the flavone content contrast reference; and obtaining the content of the flavone in the suaeda salsa according to the dilution multiple of the to-be-measured solution. According to the method provided by the invention, soaking and microwave-assisted extracting are adopted to extract flavone, and the content of the flavone is measured by chromatography, so that the method is simple and the solvent is easily available. Besides, the obtained flavone is high in content, and has the physiological and pharmacological activities such as antiviral activity, antioxidant activity, anti-ageing activity and the like.
Owner:YANCHENG INST OF IND TECH

Microwave assisted continuous synthesis of nanocrystalline powders and coatings using the polyol process

A method of forming a nanocrystalline metal, comprising the steps of: providing a reaction mixture comprising a metal precursor and an alcohol solvent; continuously flowing the reaction mixture through a reactor; applying microwave or millimeter-wave energy to the reaction mixture; wherein the microwave or millimeter-wave energy is localized to the vicinity of the reaction mixture; and heating the reaction mixture with the microwave or millimeter-wave energy so that the alcohol solvent reduces the metal precursor to a metal; wherein the heating occurs in the reactor.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

Microwave-assisted magnetic recording head and magnetic read/write apparatus using the same

A microwave-assisted magnetic recording head includes: a main magnetic pole that generates a recording magnetic field to be recorded on a magnetic recording medium; a shield; and an oscillator that is provided between the main magnetic pole and the shield and generates a microwave magnetic field. The microwave-assisted magnetic recording head is provided with a thermal expansion device for adjusting a relative position between the oscillator and the main magnetic pole so as to be able to independently adjust a recording magnetic field from the main magnetic pole and a microwave magnetic field from the oscillator.
Owner:HITACHI LTD

Medlar and red date enzyme and preparation method thereof

The invention discloses a medlar and red date enzyme and a preparation method thereof, which belong to the technical field of enzyme preparation. Multi-strain composite fungi powder is adopted as a leavening agent; the medlar and the red date are adopted as main raw materials; dietary fiber, pectin hydrolyzate, seasoner extracting liquor, Chinese herbal medicine extracting liquor, enzyme stabilizer and other multifunctional auxiliary raw materials are scientifically compounded and modified; low-temperature processing technology such as ultrasonic cleaning, cryogenic grinding, microwave-assisted high-voltage pulse electric field processing and ultrasonic ripening are mainly adopted in the whole process, so that the natural colors, the flavor, the taste and the content of the active materials of the medlar and the red date are maintained furthest, the biological stability, the non-biological stability and the biological activity of the medlar and red date enzyme are obviously enhanced, the introduction of chemical addition agent is reduced, and the juicing rate of the medlar and the red date as well as the food safety of the enzyme are improved. Finally, the medlar and red date enzyme with high biological activity, strong stability, strong taste, flavor and appetite, long expiration date and edible safety is prepared.
Owner:NINGXIA JINSHANGQI BIOTECH

Microwave assisted magnetic recording and magnetic storage device

Disclosed is a technique of providing a large-capacity magnetic storage device at high device manufacturing yield while keeping the reliability, the magnetic storage device enabling recording on a perpendicular magnetic recording medium having distribution of characteristics in the circumferential direction as well at high track density of 500 kTPI or more that would be expected from the average characteristics of the medium. A recording condition from is selected for each sector from a parameter table that stores a set of at least two types of recording conditions by a microwave assisted magnetic recording head including a magnetic recording pole and a high-frequency magnetic field oscillator in the magnetic storage device, and information is recorded for each sector based on the condition.
Owner:HITACHI LTD

Microwave-assisted peptide synthesis

An instrument and process for accelerating the solid phase synthesis of peptides is disclosed. The method includes the steps of deprotecting a protected first amino acid linked to a solid phase resin by admixing the protected linked acid with a deprotecting solution in a microwave transparent vessel while irradiating the admixed acid and solution with microwaves, then activating a second amino acid by adding the second acid and an activating solution to the same vessel while irradiating the vessel with microwaves, then coupling the second amino acid to the first acid while irradiating the composition in the same vessel with microwaves, and cleaving the linked peptide from the solid phase resin by admixing the linked peptide with a cleaving composition in the same vessel while irradiating the composition with microwaves.
Owner:CEM CORP

Microwave assisted magnetic recording system

A microwave assisted magnetic recording system includes a write pole that generates a write magnetic field, an element that generates a radio frequency assist magnetic field, and a recording medium that moves relative to the write pole. The recording medium is exposed to the radio frequency assist magnetic field before it is exposed to the write magnetic field. One possible element that generates the radio frequency assist magnetic field is an assist wire placed perpendicular to the write pole. Alternatively, the assist wire can be placed parallel to the write pole so that its radio frequency assist magnetic field couples with the write pole, which in turn generates its own coupled radio frequency magnetic field along with the write magnetic field.
Owner:SEAGATE TECH LLC

A method for rapid and large-scale preparation of silver nanowires with high aspect ratio

Disclosed is a method suitable for efficiently producing silver nanowires with high aspect ratio. In this method, silver nanowires with aspect ratio of more than 300 and purity of more than 80% are produced through an acid compound mediated microwave-assisted wet chemistry method. Such silver nanowires are especially suitable for the application in the flexible transparent electrodes, as they can simultaneously improve the electrical conductivity and transparency.
Owner:JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH

Reaction and temperature control for high power microwave-assisted chemistry techniques

A method is disclosed for carrying out microwave assisted chemical reactions. The method includes the steps of placing reactants in a microwave-transparent vessel, placing the vessel and its contents into a microwave cavity, applying microwave radiation within the cavity and to the vessel and its contents while concurrently externally cooling the vessel conductively.
Owner:CEM CORP

Preparation method of ganoderma lucidum polysaccharide with high yield

The invention discloses a preparation method of ganoderma lucidum polysaccharide with high yield, which comprises the following steps: firstly, crushing ganoderma lucidum fruiting bodies into ganoderma lucidum powder, then sequentially extracting the ganoderma lucidum powder by adopting a microwave-assisted hot water extraction method and an ultrasonic-assisted hot water extraction method, and carrying out concentration, impurity removal, concentration, alcohol precipitation and drying on the obtained extracting solution to obtain water-soluble ganoderma lucidum polysaccharide; and extracting the ganoderma lucidum residues by adopting an alkali extraction method, and carrying out neutralization, dialysis, concentration, impurity removal, alcohol precipitation and drying on the obtained extracting solution to obtain alkali-soluble ganoderma lucidum polysaccharide. The method is used for extracting the ganoderma lucidum polysaccharide by combining microwave heating action and ultrasonic cavitation and extracting the alkali-soluble polysaccharide in the ganoderma lucidum by utilizing the alkali extraction method, thereby reducing the loss of the ganoderma lucidum polysaccharide; and the prepared ganoderma lucidum polysaccharide has the characteristics of high production yield, strong immunological activity and the like.
Owner:INFINITUS (CHINA) CO LTD

Microwave-Assisted Chemical Synthesis Instrument with Fixed Tuning

Abstract of Disclosure An instrument is disclosed for microwave-assisted chemical processes that avoids tuning discrepancies that otherwise result based upon the materials being heated. The instrument includes a source of microwave radiation, a waveguide in communication with the source, with at least a portion of the waveguide forming a cylindrical arc, a cylindrical cavity immediately surrounded by the cylindrical arc portions of the waveguide, and at least three slotted openings in the circumference of the circular waveguide that provide microwave communication between the waveguide and the cavity.
Owner:CEM CORP
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