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Us patent 4822509 highly magnetic iron oxide powder

  • Reduction of iron oxide utilizing dehydrating agent

    Highly orientable acicular iron particles are made by reducing an acicular ferric oxide in powder form by contacting the granular acicular ferric oxide with hydrogen in the presence of a dehydrating agent selected from calcium hydride, calcium, calcium carbide, and mixtures thereof.

  • Nucleic acid purification from plants, animals and

    Nov 21, 2017· Nucleic acid purification on silica gel and glass mixtures patent US 5658548. 1997. 8. Woodard DL, Howard AJ, Down JA, inventors; United States Patent, assignee. Process for purifying DNA on hydrated silica patent US 5342931. 1994. 9. Berensmeier S. Magnetic particles for the separation and purification of nucleic acids.

  • ThMn12-Type Alloys for Permanent Magnets - ScienceDirect

    Feb 01, 2020· Iron-rich compounds with the tetragonal ThMn 12-type structure have the potential to meet current demands for rare-earth-lean permanent magnets with high energy density and operating temperatures of 150200 °C.However, while it is normal for magnet technology to lag behind the development of underlying magnetic material, this gap has always been unusually large for ThMn 12

  • Pure Iron and Low Carbon Steels - Soft Magnetic P/M Materials

    Carbonyl iron powder derives its name from the fact that the powder is produced from the liquid iron pentacarbonyl (Fe(CO) 5). Briefly, the preparation procedure involves (1) the reduction of iron oxide to sponge iron in hydrogen, (2) the formation of Fe(CO) 5 by reacting the iron with CO and (3) the decomposition of liquid Fe(CO)

  • Patrick Dougier Inventions, Patents and Patent

    Abstract: Highly coercive, cobalt-doped ferrimagnetic iron oxide particulates comprised of ferrous iron and well-adapted for the manufacture of various magnetic recording media, are prepared by (i) thermally decomposing a ta.-diketone/cobalt complex onto fluidized iron oxide particles having the formula (FeO).sub.x Fe.sub.2 O.sub.3, wherein 0.ltoreq.x.ltoreq.1.5, (ii) next annealing the

  • Magnetorheological technology for fabricating tunable

    Feb 21, 2018· MR ionogel A 0, B 0 and C 0 were generated by adding 10 wt% of silica coated iron oxide nanoparticles into ionogel A, B and C absence of external magnetic field. More MR ionogel samples were cured under both a UV light source and a magnetic field of 60 mT, 120 mT or 240 mT for an hour to obtain the MR ionogels A 60 , A 120 and A 240 , MR

  • Lithium iron phosphate - Wikipedia

    Lithium iron phosphate (LFP) is an inorganic compound with the formula LiFePO 4.It is a gray, red-grey, brown or black solid that is insoluble in water. The material has attracted attention as a component of lithium iron phosphate batteries, a type of Li-ion battery.This battery chemistry is targeted for use in power tools, electric vehicles, and solar energy installations.

  • US20170137636A1 - Graphene Composite Material and

    US20170137636A1 US14/953,399 US201514953399A US2017137636A1 US 20170137636 A1 US20170137636 A1 US 20170137636A1 US 201514953399 A US201514953399 A US 201514953399A US 2017137636 A1 US2017137636 A1 US 2017137636A1 Authority US United States Prior art keywords graphene graphene composite composite catechol solvent Prior art date 2015-11-13 Legal

  • US Patent for Magnetic paint additive Patent (Patent

    Magnetic paint additives are formulated from ferromagnetic particles having a mixed particle range of from about to about, preferably from about to about 37 to Iron powder is preferred. Preferred additives are formulated by blending the particles with a surfactant or surfactant mixture, or a surfactant and alcohol mixture, in amounts sufficient to suspend the

  • Environmentally stable reactive alloy powders and method

    tion of the poWder to end-use shapes and during use in the intended service environment. It is another object of the invention to provide a method of making such coated poWder in a manner controlled to avoid altering the poWder composition to an extent that Would degrade the poWder end-use properties (e.g., mag netic properties).

  • Characterization and Chemical Stability of Hydrophilic and

    2.2. Synthesis of the hydrophilic magnetic nanoparticles. The nanoparticles were obtained by the co-precipitation method 5, 21-24.In 300 mL of distilled water, 19.7 g of FeSO 4.7H 2 O and 39.0 g of FeCl 3.6H 2 O were dissolved (molar ratio of ferric ion to ferrous ion in the solution of two). The solution was vigorously stirred (1000 rpm) and heated to 80 ºC.

  • US4256723A - Process for preparing precipitated red iron

    US4256723A US06/035,667 US3566779A US4256723A US 4256723 A US4256723 A US 4256723A US 3566779 A US3566779 A US 3566779A US 4256723 A US4256723 A US 4256723A Authority US United States Prior art keywords iron mixture color iron oxide crystals Prior art date 1979-05-03 Legal status (The legal status is an assumption and is not a legal conclusion.

  • GI - Low-noise permalloy ring cores for fluxgate magnetometers

    Abstract. Fluxgate magnetometers are important tools for geophysics and space physics, providing high-precision magnetic field measurements. Fluxgate magnetometer noise performance is typically limited by a ferromagnetic element that is periodically forced into magnetic saturation to modulate, or gate, the local magnetic

  • Preparation of iron/graphite coreshell structured

    Sep 22, 2004· The magnetic properties of iron-based bulk materials could be highly enhanced if particles in the nanometer size were obtained. Using the laser-induced pyrolysis of a sensitized system containing iron pentacarbonyl vapors, γ-Fe particles [5] and iron-oxide-based nanopowders [6] were recently reported.

  • DNA, RNA, and Protein Extraction: The Past and The Present

    Nov 30, 2009· Extraction of DNA, RNA, and protein is the basic method used in molecular biology. These biomolecules can be isolated from any biological material for subsequent downstream processes, analytical, or preparative purposes. In the past, the process of extraction and purification of nucleic acids used to be complicated, time-consuming, labor-intensive, and limited in terms of overall throughput.

  • EMI shielding of metals, alloys, and composites

    Jan 01, 2020· With regard to the H-field, Faradays impact will vanish. However, magnetic field protection is accomplished by using materials with high permeability, μ 1, and adequate thickness to weaken it in the shell by providing a low reluctance/resistance, i.e., round shell made up of a magnetic material (μ 1).The use of magnetic materials diminishes the field strength because of the fact

  • Patents by Inventor Subhash C. Singhal - US Patent, Patent

    Abstract: A highly sinterable powder consisting essentially of LaCrO.sub.3, containing from 5 weight % to 20 weight % of a chromite of dopant Ca, Sr, Co, Ba, or Mg and a coating of a chromate of dopant Ca, Sr, Co, Ba, or Mg; is made by (1) forming a solution of La, Cr, and dopant; (2) heating their solutions; (3) forming a combined solution having a desired ratio of La, Cr, and dopant and

  • Catalytic converter - Wikipedia

    A catalytic converter is an exhaust emission control device that reduces toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction (an oxidation and a reduction reaction). Catalytic converters are usually used with internal combustion engines fueled by either gasoline or dieselincluding lean-burn engines as well as

  • US3377286A - Developer powder containing black magnetic

    US3377286A US42667865A US3377286A US 3377286 A US3377286 A US 3377286A US 42667865 A US42667865 A US 42667865A US 3377286 A US3377286 A US 3377286A Authority US United States Prior art keywords powder range iron oxide particles magnetic iron Prior art date 1965-01-19 Legal status (The legal status is an assumption and is not a legal conclusion.

  • The Origin & Many Uses of Shellac by R.J. Wakeman - The

    Crocus powder (iron oxide) was one; it is a mild abrasive also used to polish glass and metal.(9,28) Carborundum (silicon carbide) was another; it was also used to grind the outer edge of new records to form a trim, clean edge. (10,31,32) A harder abrasive was corundum (aluminum oxide) and called emery in the gray/black powder form.

  • US4975214A - Magnetic iron oxide containing silicon

    US4975214A US07/395,302 US39530289A US4975214A US 4975214 A US4975214 A US 4975214A US 39530289 A US39530289 A US 39530289A US 4975214 A US4975214 A US 4975214A Authority US United States Prior art keywords iron oxide magnetic iron silicon content ferrous Prior art date 1986-05-28 Legal status (The legal status is an assumption and is not a legal conclusion.

  • US Patent for Method of preparing metal powders, metal

    Jun 12, 2000· The invention relates to a method of preparing metal powder comprising: preparing a simple or mixed oxalate of one or more metals formed of particles with needle-like morphology having a mean acicularity ratio (length/diameter) of from 4 to 20, and a length of from 5 to 10 microns and converting said oxalate to metal or metal alloy powder by reducing treatment with gaseous hydrogen.

  • US1368748A - Process of manufacturing iron compounds and

    US1368748A US34958220A US1368748A US 1368748 A US1368748 A US 1368748A US 34958220 A US34958220 A US 34958220A US 1368748 A US1368748 A US 1368748A Authority US United States Prior art keywords iron solution ferric hydrate salt Prior art date 1920-01-05 Legal status (The legal status is an assumption and is not a legal conclusion.

  • Control of barium ferrite decomposition during spark

    Feb 01, 2014· 1. Introduction. Barium ferrite (BaFe 12 O 19, BaM) is a hard-magnetic material, with a high coercive field and a high remanent magnetization.The crystal structure of BaM is the magnetoplumbite type (M-type) which is the simplest crystal structure of hexaferrites. 1 The unit cell is composed of the S-block and the R-block with cubic-close-packed and hexagonal-close-packed

  • Werner Ostertag Inventions, Patents and Patent

    Mar 25, 2002· Abstract: The present invention is concerned with soft-magnetic iron effect pigments with metallic luster, which are produced by grinding reductively treated carbonyl iron powder, and which are passivated either during grinding or subsequent to the grinding. The products find application in the decorative and functional fields in paint and lacquer coatings, coloring of plastics, in printing

  • (PDF) Properties, Characterizations and Applications of

    [Show full abstract] of [Ru3(CO)12] and diphenylacetylene with trimethylamine Noxide (Me3NO) yields [Ru2(CO)6(μ-{C2Ph2}2CO)] 4 as the major product and the new cluster [Ru4(CO)11(μ4-C2Ph2)2

  • An overview of problems and solutions for components

    Dec 21, 2017· In engineering applications, there are various types of boilers such as water tube boilers, fire tube boilers, packaged boiler, fluidized bed combustion boiler, pulverized fuel boiler and waste heat boilers. These boilers are used in different industries such as power plants, paper, and chemical. The present paper reports various problems (such as agglomeration, slagging, fouling, caustic

  • CPC Definition - United States Patent and Trademark Office

    A patent document claims the use of an amino acid (group title of A61K 8/44) but the single compound used in the examples is Histidine (i.e. A61K 8/4946) or Cysteine . Classes are made only for the concrete compounds explicitly disclosed or present in exemplified compositions in the patent document.

  • Removal of Dissolved Organic Matter by Magnetic Ion

    Aug 11, 2015· An interesting side note on MIEX resin is the limited extent by which the role of magnetic iron oxide on resin behavior has been investigated. In the patent for MIEX resin [14], it describes the preparation process for magnetic polymer beads using γ-Fe 2 O 3 (maghemite). It mentions in the patent that one of the advantages of magnetic

  • Current Nucleic Acid Extraction Methods and Their

    Nucleic acid extraction (NAE) plays a vital role in molecular biology as the primary step for many downstream applications. Many modifications have been introduced to the original 1869 method. Modern processes are categorized into chemical or mechanical, each with peculiarities that influence their use, especially in point-of-care diagnostics (POC-Dx).

  • Process for producing magnetic powder having high coercive

    A magnetic iron oxide powder having high coercive force is produced by dispersing a magnetic iron oxide comprising a silicon component and a phosphorus component in an aqueous solution of a cobalt ion and adding a base to the dispersion to be an alkaline condition and heat-treating the dispersion whereby the cobalt ion is adsorbed and diffused in the surface layer of the magnetic iron oxide.

  • US4400432A - Coating iron oxide particles for magnetic

    In the preparation of highly orientatable needle-shaped ferrimagnetic iron oxide particles by the reduction and reoxidation of needle-shaped particles of hydrated oxide of iron which have been surface treated against sintering the improvement which comprises effecting the surface treatment by applying to the particles of hydrated oxide of iron one layer of oxygen-containing anions and a

  • Preparation of zeolite coatings by induction heating of

    Mar 05, 2021· Induction heating was used as a tool to prepare zeolite coatings on stainless steel substrates. The substrates were double-layer wire meshes which were placed in a Teflon reactor and were heated from a distance by the alternating magnetic field produced by a generator. The reaction mixture, also heated to some extent in the reactor, was circulated in the system to be cooled in a

  • Removal of Pb, Cd and Cl from waelz oxide via

    In this study, removal of residue such as, chlorine, lead and cadmium was carried out via pyrometallurgical process by using collected condensed powder (Waelz oxide).

  • Potassium nitrate - Wikipedia

    Potassium nitrate is a chemical compound with the chemical formula K N O 3.It is an ionic salt of potassium ions K + and nitrate ions NO 3 , and is therefore an alkali metal nitrate.It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter.Potassium nitrate is one of several nitrogen-containing compounds collectively

  • US3267041A - Preparation of ferric oxide sols and sol

    US3267041A US203363A US20336362A US3267041A US 3267041 A US3267041 A US 3267041A US 203363 A US203363 A US 203363A US 20336362 A US20336362 A US 20336362A US 3267041 A US3267041 A US 3267041A Authority US United States Prior art keywords solution ferric oxide particles acetic acid size Prior art date 1962-06-18 Legal status (The legal status is an assumption and is not a

  • Smart packaging systems for food applications: a review

    Feb 17, 2015· Changes in consumer preference for safe food have led to innovations in packaging technologies. This article reviews about different smart packaging systems and their applications in food packaging, packaging research with latest innovations. Active and intelligent packing are such packaging technologies which offer to deliver safer and quality products.

  • Zinc oxide particles: Synthesis, properties and

    Mar 15, 2012· The indirect, so-called French process, was developed between 1840 and 1850 to meet a demand for ZnO for use in paints. The first US patent was registered in 1850 to Leclaire and Barruel of France, Fig. 3, . Zinc metal is the starting material in this process.

  • US3672579A - Process for beneficiating magnetite iron ore

    A process for upgrading low-grade magnetite-containing iron ore with minimum fine grinding. The dry ore is first comminuted to between about three-fourths inch and 10 mesh particle size and magnetically separated. The dry tailing is discarded and the concentrate is ground to between about 20 and 100 mesh and again subjected to dry magnetic separation.

  • Potassium nitrate - Wikipedia

    Potassium nitrate is a chemical compound with the chemical formula K N O 3.It is an ionic salt of potassium ions K + and nitrate ions NO 3 , and is therefore an alkali metal nitrate.It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter.Potassium nitrate is one of several nitrogen-containing compounds collectively

  • Bromelain: an overview of industrial application and

    Jun 26, 2014· For instance, Chen and Huang applied a magnetic nano-adsorbent using iron oxide nanoparticles as the core and polyacrylic acid (PAA) as the ionic exchange group. Notably, the process successfully produced 87.4 % bromelain activity after adsorption at pH 35 and desorption at pH 7.

  • CPC Definition - United States Patent and Trademark Office

    Constructional details or processes of manufacture of the non active parts, e.g. casings, mountings, vents, separators, current-conducting connections, arrangements for filling or emptying cases with or of liquid. Electrodes composed of or comprising active material, processes of manufacture and

  • (12) United States Patent (10) Patent N0.: US 7,056,607 B2

    (12) United States Patent US007056607B2 (10) Patent N0.: US 7,056,607 B2 a magnetic layer comprised of iron oxide, Co-modi?ed iron oxide, CrO2, a ferromagnetic metal poWder, and/or a hex agonal ferrite poWder dispersed in a binder on a nonmag netic support have been Widely employed. Of

  • US9067833B2 - Iron oxide and silica magnetic core - Google

    A magnetic core of superparamagnetic core shell nanoparticles having a particle size of less than 50 nm; wherein the core is an iron oxide and the shell is a silicon oxide is provided. The magnetic core is a monolithic structure of superparamagnetic core grains of iron oxide directly bonded by the silicon dioxide shells. A method to prepare the magnetic core which allows maintenance of the

  • Stainless steel - Wikipedia

    Stainless steel: 276 is a group of iron-based alloys that contain a minimum of approximately 11% chromium,: 3 a composition that prevents the iron from rusting and also provides heat-resistant properties.: 3 Different types of stainless steel include the elements carbon (from 0.03% to greater than 1.00%), nitrogen, aluminium, silicon, sulfur, titanium, nickel, copper, selenium, niobium, and

  • ExtraOrdinary Technology Vol 3 No 4 Vibration, Energy

    US Patent No. 4,836,932: This invention uses a water treatment cell producing locally strong super magnetic fields (60,000 to 250,000 Gauss). This is accomplished when minute highly intense magnetic fields are produced, with stabilization of micro-magnet geometry.

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