Process for preparing aluminium trihydroxide

Surface modification of pigments and compositions comprising the same

Carbon blacks and use in electrodes for lead acid batteries

Granular polycrystalline silicon and production thereof

Method for producing metal oxide-containing particles, and method for producing aggregates of metal oxide colloidal particles

Flaky mesoporous particles, and method for producing the same

Radiofrequency and other electronic devices formed from enhanced resonant frequency hexaferrite materials

Titanium oxide photocatalyst having copper compounds supported thereon, and method for producing same

Method for converting UOor UOinto hydrated UO

Aluminum phosphates, compositions comprising aluminum phosphate, and methods for making the same

Antimicrobial chemical compositions

Mold for casting polycrystalline silicon ingot, and silicon nitride powder for mold release material thereof, slurry containing silicon nitride powder for mold release layer thereof and mold release material for casting thereof

Apparatus for mechanical exfoliation of particulate materials

Cement and concrete with calcium aluminates

Positive electrode active material for lithium secondary battery and method for preparing the same

Metal-doped nickel oxide active materials

Mineral composition, especially for use in paper fillers and paper or plastic coatings

Method for preparation of hematite iron oxide with different nanostructures and hematite iron oxide prepared thereby

Continuous process for nanomaterial synthesis from simultaneous emulsification and detonation of an emulsion

Higly dispersible silica for using in rubber

Methods of making metal-doped nickel oxide active materials

Supported catalyst of digestion residues of titanyl sulphate-containing black solution

Low structure carbon black and method of making same

Lithium titanate particles and process for producing the lithium titanate particles, Mg-containing lithium titanate particles and process for producing the Mg-containing lithium titanate particles, negative electrode active substance particles for non-aqueous electrolyte secondary batteries, and non-aqueous electrolyte secondary battery

Hollow silica particles and method for producing the same

Methods and systems for utilizing waste sources of metal oxides

Resin composition

Method for the production of stable binder-free high-purity moldings composed of metal oxides and their use

Semiconductor ceramic and method for manufacturing the same, and laminated semiconductor ceramic capacitor with varistor function and method for manufacturing the same

Porous silicon oxynitride materials for chromatographic separation and method of their preparation

Modified carbon blacks having low PAH amounts and elastomers containing the same

Precipitated silica sorbents and method of separating materials from a fluid stream

Carbon material for nonaqueous-electrolyte secondary-battery negative electrode and process for producing the same, negative electrode including the same for nonaqueous secondary battery, and nonaqueous-electrolyte secondary battery

Process for nanomaterial synthesis from the preparation and detonation of an emulsion, products and emulsions thereof

Polyurethane resin addition pigment, process for producing polyurethane resin addition pigment, pigment dispersion composition, and jet printing ink composition

Treated mineral filler products, process for the preparation thereof and uses of same

Resin composite material and method for producing resin composite material

Mesoporous metal oxide microsphere electrode compositions and their methods of making

Lithium—transition metal oxide powder and method of producing the same, positive electrode active material for lithium ion battery, and lithium ion secondary battery

Active material, manufacturing method for active material, and lithium ion secondary battery

Active material for battery, nonaqueous electrolyte battery, and battery pack

Silicon dioxide powder having special surface properties and toner composition containing said powder

Metal suboxide and methods of preparing same

Process for the preparation of surface treated mineral filler products and uses of same

Process for obtaining precipitated calcium carbonate

Method of manufacturing a porous gallium (III) oxide photocatalyst for preparation of hydrocarbons

Method for synthesis of ketones from plant oils

Spherical, amorphous calcium carbonate particles

Carbon particles coated with polymer films, methods for their production and uses thereof

Manganese oxide and method for producing same, and method for producing lithium manganese composite oxide using same

Lithium manganate for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

Aluminum dry-coated and heat treated cathode material precursors

Silica-based material and process for producing the same, noble metal supported material and process for producing carboxylic acids by using the same as catalyst

Powder comprising polymer-coated inorganic particles

Method for manufacturing calcium silicate based composition

Mixed metal oxidized hydroxide and method for production

Nanowire catalysts and methods for their use and preparation

Metal oxide or semimetal oxide spherical beads, a process for making, and a process for using

Polyurethane resin adhesion pigment, pigment dispersion composition and inkjet ink composition

Positive electrode active material

Porous metal oxide particles and their methods of synthesis

Spherical aluminum nitride powder

Mesoporous titania bead and method for preparing the same

Composition based on cerium, zirconium and tungsten, preparation process and use in catalysis

Manganese oxide/graphene nanocomposite and producing method of the same

Solar Cell

Carbon coated silica particles and methods of making same

Fabricating porous materials using intrepenetrating inorganic-organic composite gels

Silicon nitride powder for siliconnitride phosphor, SrAlSiONphosphor and β-sialon phosphor both obtained using same, and processes for producing these

Unsupported and supported non-promoted ruthenium sulfide catalyst with high catalytic activity for hydrocarbon hydrotreatments and its method

Use of surface modified calcium carbonate in adhesives, sealants and/or caulks

Process for producing dispersion of particles of rutile titanium oxide

Silicon nitride powder for siliconnitride phosphor, CaAlSiNphosphor using same, SrSiNphosphor using same, (Sr, Ca)AlSiNphosphor using same, LaSiNPhosphor using same, and methods for producing the phosphors

Process to prepare surface-modified mineral material, resulting products and uses thereof

NANOPOROUS PHOTOCATALYST HAVING HIGH SPECIFIC SURFACE AREA AND HIGH CRYSTALLINITY AND METHOD FOR PREPARING THE SAME

Method for preparing white carbon black modified by silane coupling agent

Lime causticization product brightness improvement via pre-slaking

YTTRIUM HYDROXYCARBONATE MODIFIED WITH HETEROGENEOUS METAL, METHOD OF PREPARING THE SAME, AND ADSORBENT AND FILTER DEVICE INCLUDING THE SAME

Method for Preparing Impurity-Doped Titanium Dioxide Photocatalysts Representing Superior Photo Activity at Visible Light Region and Ultraviolet Light Region in Mass Production

Dry liquid

Mesoporous titanium dioxide nanoparticles exhibiting bimodal pore size distributions and process for their production

PHOTOCATALYST-CONTAINING FILTER MATERIAL, AND PHOTOCATALYST FILTER INCLUDING THE FILTER MATERIAL

Lithium composite compound particles and process for producing the same, and non-aqueous electrolyte secondary battery

Lithium titanate crystal structure, composite of lithium titanate crystal structure and carbon, method of production thereof, and electrode and electrochemical element employing said composite

Nonaqueous electrolyte battery, electrode for the same, and battery pack

Specialty materials processing techniques for enhanced resonant frequency hexaferrite materials for antenna applications and other electronic devices

Coating for machine parts used in the production of pig iron or steel

Method of manufacture of aqueous suspensions of talc from an acrylic polymer with a grafted surfactant group, suspensions obtained and their uses

LITHIUM-TITANIUM COMPLEX OXIDE AND MANUFACTURING METHOD THEREOF, AS WELL AS BATTERY ELECTRODE AND LITHIUM ION SECONDARY BATTERY USING SAME

Negative electrode active material for non-aqueous electrolyte secondary battery and method for manufacturing the same

Basic zinc cyanurate fine particles, and method for producing same

LITHIUM-TITANIUM COMPLEX OXIDE, AND BATTERY ELECTRODE AND LITHIUM ION SECONDARY BATTERY USING SAME

Method for manufacturing calcium silicate based composition

Process for the production of a core/shell zeolitic material having a CHA framework structure

CERAMIC MATERIAL AS WELL AS BATTERY ELECTRODE AND LITHIUM ION SECONDARY BATTERY CONTAINING THE SAME

Synthesis of ultrasmall metal oxide nanoparticles

NANOSTRUCTURED METAL OXIDES AND MIXED METAL OXIDES, METHODS OF MAKING THESE NANOPARTICLES, AND METHODS OF THEIR USE

Chiral nematic nanocrystalline metal oxides

Method of preparing a TiO2 nanostructure

Production of graphenic carbon particles utilizing methane precursor material

Production of graphenic carbon particles utilizing hydrocarbon precursor materials

Method of synthesizing anatase TiOnanosheets

Treated fillers, compositions containing same, and articles prepared therefrom

Method for Surface Modification of Titanium Dioxide Pigment

Cathode active material precursor particle, method for producing thereof and method for producing cathode active material for lithium secondary battery

Silica coating for enhanced hydrophilicity

Injectable fillers for aesthetic medical enhancement and for therapeutic applications

PVDF coating composition

Alkali metal silicate, alkali transition metal silicate, and method for synthesizing silicate

MAGNESIUM OXIDE FOR PHARMACEUTICAL PREPARATION

Use of glycerol as an agent to improve the self-dispersing properties of a mineral material to be added to an aqueous composition

Silicon-carbonaceous encapsulated materials

Method of manufacturing spherical mesoporous silica containing dispersed silver nanoparticles, and spherical mesoporous silica manufactured by said method

PLATE-LIKE PARTICLE FOR CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, CATHODE ACTIVE MATERIAL FILM FOR LITHIUM SECONDARY BATTERY, METHODS FOR MANUFACTURING THE PARTICLE AND FILM, METHOD FOR MANUFACTURING CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY

Lithium titanate, method for producing same, electrode active material containing the lithium titanate, and electricity storage device using the electrode active material

Nickel-cobalt-maganese-based compound particles and process for producing the nickel-cobalt-manganese-based compound particles, lithium composite oxide particles and process for producing the lithium composite oxide particles, and non-aqueous electrolyte secondary battery

Generation kaolin based paint pigment extender

METHOD FOR PRODUCING MIXED OXIDES COMPRISING LITHIUM

Coarse pigment addition and high solids slurries for higher coating colour concentrations

FILLER FOR SYNTHETIC RESIN, SYNTHETIC RESIN COMPOSITION, MANUFACTURING METHOD THEREFOR, AND MOLDED OBJECT MADE THEREFROM

MIXED OXIDE POWDER CONTAINING THE ELEMENTS LITHIUM, MANGANESE, NICKEL AND COBALT AND METHOD FOR PRODUCING SAME

Lithium batteries containing lithium-bearing iron phosphate and carbon

Nonaqueous electrolyte battery, battery pack and vehicle

Method for carbon black production using preheated feedstock and apparatus for same

Silica particle manufacturing process

Pigment additive for improving solar reflectance

Porous silicon

Shape preserving chemical transformation of ZnO mesostructures into anatase TiOmesostructures for optoelectronic application

Printed electronics

POSITIVE ELECTRODE ACTIVE SUBSTANCE PRECURSOR PARTICLES, POSITIVE ELECTRODE ACTIVE SUBSTANCE PARTICLES AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Carbon black, method for producing carbon black, and rubber composition

Ceria-zirconia base composite oxide, method for producing the same, and catalyst for purification of exhaust gas using the ceria-zirconia base composite oxide

Hydrophobic silica particles and method of producing same

NEGATIVE ELECTRODE ACTIVE MATERIAL , NONAQUEOUS ELECTROLYTE BATTERY, BATTERY PACK AND VEHICLE

Positive-electrode material for lithium secondary-battery, process for producing the same, positive electrode for lithium secondary battery, and lithium secondary battery

Composite particles and method for production thereof

Mo-, Bi- and Fe-comprising multimetal oxide compositions

Activated charcoal

Electrode active material and electrode active material production method

Chemical vapor deposition graphene foam electrodes for pseudo-capacitors

Method of fabricating medium-high temperature CO2 sorbents made of alkali metal promoted calcium aluminate carbonates

Lithium secondary battery and positive electrode active material for the lithium secondary battery

Powder comprising polymer-coated glass particles

POWDERS FOR POSITIVE-ELECTRODE MATERIAL FOR LITHIUM SECONDARY BATTERY, PROCESS FOR PRODUCING THE SAME, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY EMPLOYING THE SAME, AND LITHIUM SECONDARY BATTERY

Preparation of mesoporous and macroporous silica gel

Silica doped aluminous particulate materials

Powder comprising polymer-coated core particles comprising metals, metal oxides, metal nitrides or semimetal nitrides

Potato-shaped graphite particles with low impurity rate at the surface, method for preparing the same

Method of producing active material particles with lithium transition metal oxide secondary particles

METHOD FOR THE PREPARATION OF BORON NITRIDE POWDER

Superficially porous metal oxide particles, methods for making them, and separation devices using them

Titanium oxide sol and process for producing same, ultrafine particulate titanium oxide, process for producing same, and uses of same

Moderate Temperature Synthesis of Mesoporous Carbon

Resin-coated metal pigment, method for producing the same, and water base paint using the same

PRECIPITATED SILICA

Group III nitride crystal and method for producing the same

Synthesis method of transition metal nitride and transition metal nitride

Carbon Black, Method of Producing Carbon Black and Device for Implementing the Method

Method and apparatus for producing metal oxide particles

HIGHLY ACIDIC COMPOSITIONS COMPRISING ZIRCONIUM AND SILICON OXIDES AND AN OXIDE OF AT LEAST ONE OTHER ELEMENT SELECTED FROM AMONG TITANIUM, ALUMINUM, TUNGSTEN, MOLYBDENUM, CERIUM, IRON, TIN, ZINC, AND MANGANESE

Ultracapacitors using transition metal nitride-containing electrode and transition metal nitride

Coarse support silica particles

Positive-electrode active material for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery

Synthetic amorphous silica powder and method for producing same

Synthetic amorphous silica powder and method for producing same

LITHIUM SECONDARY BATTERY ACTIVE MATERIAL AND LITHIUM SECONDARY BATTERY USING THE SAME

Silicon/germanium oxide particle inks and processes for forming solar cell components and for forming optical components

Aqueous dispersion liquid and coating material, film, and product using the same

Synthesis of metal borides

Surface-treated calcium carbonate and paste-like resin composition containing same

Cerium oxide-zirconium oxide composite oxide and method for producing the same

Effect pigments

Nanocomposite particle and process of preparing the same

Alpha-Alumina and Associated Use, Synthesis Method and Device

Biocidal colloidal dispersions of silica particles with silver ions adsorbed thereon

DIRECTLY COMPRESSIBLE MAGNESIUM HYDROXIDE CARBONATE

Method for manufacturing a lithium complex metal oxide

Synthetic amorphous silica powder and method for producing same

SPHERICAL HYDROTALCITE COMPOUND AND RESIN COMPOSITION FOR SEALING ELECTRONIC COMPONENT

HEXAGONAL FERRITE MAGNETIC POWDER AND MAGNETIC RECORDING MEDIUM USING THE SAME

Process for producing carbon fillers having covalently bonded amino groups

POSITIVE ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR PRODUCING SAME AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY USING SAME

METHODS AND PRODUCTS UTILIZING MAGNESIUM OXIDE FOR CARBON DIOXIDE SEQUESTRATION

Anatase White Pigment with High Light and Weather Resistance

Method of making titanium dioxide in the shape of columnar particles

POWDER, METHOD OF PRODUCING POWDER AND ADSORPTION APPARATUS

Stable sub-micron titania sols

ACTIVE MATERIAL PARTICLES AND USE OF SAME

Spray Pyrolysis Synthesis of Mesoporous Positive Electrode Materials for High Energy Lithium-Ion Batteries

Titanium dioxide nanoparticles

Sulfur containing silica particle

Synthesis of nanoparticles by means of ionic liquids

Positive electrode active material for lithium secondary battery, method for producing the same, and lithium secondary battery

Infrared reflecting black pigment, and paint and resin composition using the infrared reflecting black pigment

Cementitious products and articles of manufacture containing carbon-doped titanium dioxide

Amorphous and partially amorphous nanoscale ion storage materials

Non-aqueous electrolyte battery including a positive electrode comprising layered lithium composite oxides, battery pack, and vehicle

Titanium dioxide photocatalyst containing carbon and method for its production

MAGNETIC IRON OXIDE FINE PARTICLES, AND MAGNETIC PARTICLE-CONTAINING WATER DISPERSION AND PROCESS FOR PRODUCING THE SAME

Carbon microparticle having lignin as raw material and preparation method therefor

Precipitated magnesium carbonate

Acid modified natural filler to initialize the beta-nucleation of polypropylene

METHOD FOR PRODUCING COMPOSITE SILICA PARTICLES

ZIRCONIA CERIA COMPOSITIONS

NEPHELINE SYENITE POWDER WITH CONTROLLED PARTICLE SIZE AND NOVEL METHOD OF MAKING SAME

Positive active material for rechargeable lithium battery, method of preparing same and rechargeable lithium battery including same

Electrode active material comprising a mixture of a layered crystal structure material and a spinel crystal structure material, electrode, and non-aqueous electrolyte secondary battery

Process for producing spherical aluminum nitride powder and spherical aluminum nitride powder produced by the same process

Method for producing mesoporous silica particles

Composites of inorganic microparticles having a phosphated surface and alkaline earth carbonate nanoparticles

Sulfur containing silica particle

High power, wide-temperature range electrode materials, electrodes, related devices and methods of manufacture

ADHESIVES

Sulfur containing silica particle

Battery active material, nonaqueous electrolyte battery and battery pack

Method for producing lithium composite metal oxide, lithium composite metal oxide, and nonaqueous electrolyte secondary battery

FERROMAGNETIC PARTICLES AND PROCESS FOR PRODUCING THE SAME, ANISOTROPIC MAGNET AND BONDED MAGNET

Inorganic compounds

METHODS FOR SYNTHESIZING SUBMICRON DOPED SILICON PARTICLES

METHODS OF MAKING TITANIUM DIBORIDE POWDERS

Method of synthesizing metal composite oxide and metal composite oxide obtained by same

System for preparing silica aerogel powder

Nitrogen-containing porous carbon material and method of producing the same, and electric double-layer capacitor using the nitrogen-containing porous carbon material

Glass Flake Pigments and Substrates

Process for preparing an alumina with controlled mesoporosity

Method for sizing of mineral matter in the presence of additives containing glycerol, products obtained and their uses

FERRIC PHOSPHATE HYDRATE PARTICLES AND PROCESS FOR PRODUCING THE SAME, OLIVINE TYPE LITHIUM IRON PHOSPHATE PARTICLES AND PROCESS FOR PRODUCING THE SAME, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Carbon composition with hierarchical porosity, and methods of preparation

Method of inhibiting water adsorption of powder by addition of hydrophobic nanoparticles

Method of producing carrier for catalyst for oxidative dehydrogenation of n-butane, method of producing carrier-supported magnesium orthovanadate catalyst, and method of producing n-butene and 1, 3-butadiene using said catalyst

Composites of inorganic microparticles having a phosphated surface and alkaline earth carbonate nanoparticles

Titanium dioxide pigments and manufacturing method

Positive Electrode Active Material For A Lithium-Ion Battery, Positive Electrode For A Lithium-Ion Battery, Lithium-Ion Battery Using Same, And Precursor To A Positive Electrode Active Material For A Lithium-Ion Battery

PROCESS FOR PRODUCTION OF SILICON TETRACHLORIDE

Hydrotalcite-type particles, heat retaining agent for agriculture films, master batch for agricultural films, and agricultural film

Aggregates of small particles of synthetic faujasite zeolite

Composites of inorganic microparticles having a phosphated surface and alkaline earth carbonate nanoparticles

Crystalline mesoporous titanium dioxide and the use thereof in electrochemical devices

Method of manufacturing ceramic powder having perovskite structure and ceramic powder having perovskite structure manufactured using the same

Fumed silanized silica

Positive active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery

Methods for preparing and using metal and/or metal oxide porous materials

METHOD FOR PRODUCING DISPERSION OF MICROPARTICLES OF INORGANIC OXIDE IN ORGANIC SOLVENT

Positive electrode active substance particles and process for producing the same, and non-aqueous electrolyte secondary battery

Strontium carbonate micropowder and process for production

High surface area and low structure carbon blacks for energy storage applications

Lead-acid batteries and pastes therefor

Synthesizing method for lithium titanium oxide nanoparticle using supercritical fluids

ANODE ACTIVE MATERIAL, ANODE, BATTERY, AND METHOD OF MANUFACTURING ANODE

MESOPOROUS OXIDE OF TITANIUM

Carbon materials comprising enhanced electrochemical properties

Method

Crosslinking Initiator

Hexagonal crystal ferrite magnetic powder for magnetic recording, method for producing the same, and magnetic recording medium using the powder

Titanate / titania composite nanoparticle

Preparation method for aqueous polyurethane resin-pigment dispersion, aqueous polyurethane resin-pigment dispersion, and ink composition

Sulfur resistant cladded titania—alumina supports

CATALYST FOR PRODUCTION OF SYNTHESIS GAS

Graphite particles and lithium secondary battery using the same as negative electrode

MAGNESIUM OXIDE POWDER HAVING EXCELLENT DISPERSIBILITY AND METHOD FOR PRODUCING THE SAME

ALPHA ALUMINA (CORUNDUM) WHISKERS AND FIBROUS-POROUS CERAMICS AND METHOD OF PREPARING THEREOF

Composition comprising cerium oxide and zirconium oxide having a specific porosity, preparation method thereof and use of same in catalysis

Process to prepare a surface-reacted calcium carbonate implementing a weak acid, resulting product and uses thereof

Mesoporous composite titanium oxide and a preparation method

High density cathode materials for secondary batteries

Cathode active material having manganese oxide and boron, cathode and lithium battery including cathode active material, and method of preparing the cathode active material

LOW ASH ACTIVATED CARBON AND METHODS OF MAKING SAME

Nano silver-zinc oxide composition

NANOCRYSTALLINE MATERIALS FOR ELECTRONIC APPLICATIONS

PROCESS FOR PRODUCING ALUMINUM TITANATE-BASED FIRED BODY

POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PRODUCING THE SAME, AND LITHIUM SECONDARY BATTERY

Polishing slurry including zirconia particles and a method of using the polishing slurry

Active material for batteries, non-aqueous electrolyte battery, and battery pack

α alumina sintered body for production of sapphire single crystal

Process for the preparation of titanium dioxide having nanometric dimensions and controlled shape

Process for producing dispersion of surface-treated carbon black powder, and process for producing surface-treated carbon black powder

METHOD FOR MANUFACTURING A SILICON NANOWIRE ARRAY USING A POROUS METAL FILM

Continuous Synthesis of Carbon-Coated Lithium-Iron-Phosphate

Positive electrode active material for lithium secondary battery, and use thereof

Ferrite magnetic material

Method for preparing perovskite oxide-based catalyst particles

Titanium oxide photocatalyst and method for producing the same

Surface-modified silicic acid semi-gels

Ceramic particulate material and processes for forming same

AGGREGATE PARTICLES OF TITANIUM DIOXIDE FOR SOLAR CELLS

FUMED SILANIZED AND GROUND SILICA

GRAPHENE/NANO-TITANIUM DIOXIDE COMPOSITES AND METHODS FOR PREPARING THE SAME

METHOD OF MANUFACTURING PEROVSKITE POWDER, PEROVSKITE POWDER MANUFACTURED BY THE SAME AND MULTILAYER CERAMIC ELECTRONIC COMPONENT

For preparing surface-reacted calcium carbonate and its use

Coating comprising multipopulation fumed silica particles

Porous composite metal oxide, catalyst using the same, and methods for producing the porous composite metal oxide and the catalyst

Nonaqueous electrolyte battery, battery pack and vehicle

BISMUTH VANADATE PARTICLES AND THE METHOD FOR PRODUCING SAME

METHOD FOR MANUFACTURING BARIUM TITANATE POWDER AND BARIUM TITANATE POWDER MANUFACTURED BY THE SAME

Manufacturing method of surface treated zinc oxide particles, surface treated zinc oxide particles, dispersion liquid and dispersion solid thereof, and base material coated with zinc oxide particles

Metal oxide particle production method and production device

Electrolytic manganese dioxide, and method for its production and its application

Rubber granulate conversion process for producing a semi-active carbonized substance and a plasticizer

Sorbent For Removal Of A Contaminant From A Fluid

Porous carbon for electrochemical double layer capacitors