3755 results about "Acid treatment" patented technology

A silk nanofiber composite network produced by forming a solution of silk fiber and hexafluroisopropanol, wherein the step of forming is devoid of any acid treatment, where the silk solution has a concentration of about 0.2 to about 1.5 weight percent silk in hexafluroisopropanol, and where the silk is selected from Bombyx mori silk and Nephila clavipes silk; and electrospinning the solution, thereby forming a non-woven network of nanofibers having a diameter in the range from about 2 to about 2000 nanometers.

An alkali aluminosilicate glass article, said alkali aluminosilicate glass having a surface compressive stress of at least about 200 MPa, a surface compressive layer having a depth of at least about 30 μm, a thickness of at least about 0.3 mm and an amphiphobic fluorine-based surface layer chemically bonded to the surface of the glass. In one embodiment the glass has an anti-reflective coating applied to one surface of the glass between the chemically strengthened surface of the glass and the amphiphobic coating. In another embodiment the surface of the chemically strengthened glass is acid treated using a selected acid (e.g., HCL, H2SO4, HClO4, acetic acid and other acids as described) prior to placement of the amphiphobic coating or the anti-reflective coating.

An anode structure for lithium batteries includes nanofeatured silicon particulates dispersed in a conductive network. The particulates are preferably made from metallurgical grade silicon powder via HF / HNO3 acid treatment, yielding crystallite sizes from about 1 to 20 nm and pore sizes from about 1 to 100 nm. Surfaces of the particles may be terminated with selected chemical species to further modify the anode performance characteristics. The conductive network is preferably a carbonaceous material or composite, but it may alternatively contain conductive ceramics such as TiN or B4C. The anode structure may further contain a current collector of copper or nickel mesh or foil.

The invention provides a preparation method of graphene, and particularly relates to a method for preparing biomass graphene employing cellulose as a raw material. The specific preparation method comprises the following steps: 1, preparing a catalyst solution; 2, carrying out ionic coordination and high-temperature deoxidization on cellulose and a catalyst, so as to obtain a precursor; 3, carrying out thermal treatment; 4, carrying out acid treatment, and drying to obtain the graphene, wherein the prepared graphene is uniform in morphology, has a single-layer or multi-layer two-dimensional layered structure; the dimension is 0.5-2 microns; and the electrical conductivity is 25,000-45,000S / m. The preparation method is simple in preparation technology, low in cost, high in yield, high in production safety, and controllable in product dimension and physical property; industrialized production can be realized; the graphene prepared by the method can be applied to electrode materials of super capacitors and lithium ion batteries, and can also be added to resin and rubber as an additive; and the physical property of the material can be improved.

An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder. The method of manufacturing hexagonal ferrite magnetic powder comprises wet processing hexagonal ferrite magnetic particles obtained following acid treatment in a water-based solvent to prepare an aqueous magnetic liquid satisfying relation (1) relative to an isoelectric point of the hexagonal ferrite magnetic particles: pH0−pH*≧2.5, wherein, pH0 denotes the isoelectric point of the hexagonal ferrite magnetic particles and pH* denotes a pH of the aqueous magnetic liquid, which is a value of equal to or greater than 2.0, adding a surface-modifying agent comprising an alkyl group and a functional group that becomes an anionic group in the aqueous magnetic liquid to the aqueous magnetic liquid to subject the hexagonal ferrite magnetic particles to a surface-modifying treatment, and removing the water-based solvent following the surface-modifying treatment to obtain hexagonal ferrite magnetic particles.

A process for easily synthesizing a zeolite substance containing an element having a large ionic radius in the framework at a high ratio. This process comprises the following first to fourth steps: First Step: a step of heating a mixture containing a template compound, a compound containing a Group 13 element of the periodic table, a silicon-containing compound and water to obtain a precursor (A); Second Step: a step of acid-treating the precursor (A) obtained in the first step; Third Step: a step of heating the acid-treated precursor (A) obtained in the second step together with a mixture containing a template compound and water to obtain a precursor (B); and Fourth Step: a step of calcining the precursor (B) obtained in the third step to obtain a zeolite substance.

The present invention provides a toner and a developer which includes the toner. The toner is produced in an aqueous medium and includes at least a binding resin, a colorant and a dispersant which disperses the colorant. The binding resin contains 50% by mass to 100% by mass of a polyester resin, and the colorant is a pigment whose surface is given an acid treatment. The acid value of the dispersant is 1 mg KOH / g to 30 mg KOH / g, and the amine value of the dispersant is 1 mg KOH / g to 100 mg KOH / g.

The present invention is preparation process of bamboo fiber, including coarse bamboo fiber, refined bamboo fiber and spinnable bamboo fiber. The coarse bamboo fiber is prepared through cutting bamboo, separating bamboo fiber, steaming inside the No. 1 softening liquid and enzyme fermentation; the refined bamboo fiber is prepared through steaming inside the No. 2 softening liquid, enzyme fermentation, rinsing and bleaching, acid treatment, and oil soaking and drying; and the spinnable bamboo fiber is prepared through emulsifying, initial carding, combing and drawing. The bamboo fiber has lignin content lower than 5 %, and has the features of being natural and green, high in strength, high toughness, high brightness and high elasticity.

A process for the extraction and purification of Paclitaxel from a natural source of taxanes, comprising extracting Paclitaxel with an organic solvent from a natural source of taxanes, and treating the raw material with a base or an acid to obtain a biomass by precipitation. The biomass is isolated and dried, and resin and natural pigments are removed. The biomass is then dissolved in acetone and at least one non-polar solvent is added, until a Paclitaxel-enriched oily phase is obtained. The Paclitaxel-enriched oily phase is then treated with a base or an acid to obtain a second biomass, which is recovered by precipitation and dried. A solution of the second biomass in a volatile solvent is chromatographically purified at least once and crystallized.

One of many universal requirements of dental or orthopedic implants, wherever they are used in the vital body, is that the implant system should be biologically functioning. To achieve the biological functionality, the implant should meet several requirements for compatibility. These include biological compatibility and mechanical compatibility. It has now been recognized that morphological compatibility and crystallographic compatibility should be added to these two compatibility requirements. Hence, the present invention provides a method of forming a certain type of crystalline structure of titanium oxide and controlled surface roughness to meet both morphological and crystallographic compatibilities. It has been further determined that a chemical treatment (using sodium hydroxide) alone or followed by in-air oxidation, or acid treatment (a mixed aqueous solution of hydrofluoric acid and nitric acid), followed by sodium hydroxide treatment, furthermore followed by in-air oxidation provide for advantageous surface modifications to create a complex mixture of rutile with anatase and / or brookite types of titanium oxide and provide a most favorable surface for wettability and an acceptable range of surface roughness.

A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in which the sludge that is treated is made to contain dissolved iron and phosphorus at a molar ratio Fe:P of above 1:1, the sludge is treated at 0-100° C. with an acid at a pH of 1-5 for dissolution of divalent iron and phosphorus from the sludge, the sludge is supplied with an oxidiser selected from hydrogen peroxide and percompounds, wherein divalent iron is oxidised by Fenton's reaction to trivalent iron, and (i) trivalent iron is precipitated as trivalent iron phosphate (ii) free radicals with a deodorisation and sanitation effect are formed by Fenton's reaction, the sludge is then dewatered at a pH of at most 7, and the aqueous solution obtained in dewatering is recirculated to the wastewater purification.

This invention relates to a method of manufacturing a transparent conductive film containing carbon nanotubes and a binder, in which the carbon nanotubes are subjected to acid treatment, dispersion in a solvent, mixing with the binder, and application on the substrate, and to a transparent conductive film manufactured thereby. The method includes subjecting carbon nanotubes having an outer diameter of less than 15 nm to acid treatment to thus purify and surface functionalize them, followed by dispersing the treated carbon nanotubes in a solvent along with the binder, or mixing a carbon nanotube solution using a polar or nonpolar solvent with a binder solution, and applying the mixture on the substrate. Through the application of the mixture of treated carbon nanotubes and binder on the substrate, the transparent conductive film has improved transparency, electrical conductivity, dispersibility, substrate adhesiveness, chemical stability, durability and scratch resistance, and can be applied to various substrates, including hard or flexible substrates, thanks to high substrate adhesiveness and applicability. A solution in which the surface functionalized carbon nanotubes are well dispersed is prepared, thus facilitating the manufacture of the film using various materials and generating economic benefits.

A process for treating a composition containing a polyamine-epihalohydrin resin that has a low level of CPD-producing species and good gelation stability is disclosed. A polyamine-epihalohydrin resin is prepared with a ratio of epihalohydrin:amine of less than about 1.1:1.0; The resin is then subjected to a base treatment followed by an acid treatment resulting in a resin that has good gelation storage stability and produces low levels of CPD.

A method for treating the surfaces of materials to improve wettability and adhesion of subsequently deposited polymer layers is disclosed. Suitable materials for practice of the method include polymeric materials and silicon-containing materials is disclosed. The method involves contacting at least a portion of the surface of the material with an aqueous solution of sulfuric acid or phosphoric acid, followed by rinsing with water. After the acid treatment, the contact angle of the surface decreases, and subsequently deposited polymer coatings easily wet the material's surface and exhibit enhanced adhesion. The method may be used to fabricate useful structures, such as semiconductor structures, optical waveguide structures, and coated articles.

The invention relates to high-silicon-to-aluminum-ratio hierarchical beta zeolite and a preparing method of the beta zeolite. The bore diameters of channels of the beta zeolite are distributed in ranges smaller than 2nm, between 5 and 11nm, and greater than 50nm, wherein the micropore volume is greater than 0.19cm<3> / g, the total volume of meso pores and macro pores is greater than 0.35cm<3> / g, the silicon-to-aluminum ratio is greater than 90, and the specific surface area is greater than 400m<2> / g. The preparing method comprises the following steps that raw material beta zeolite is subjected to primary acid treatment; the beta zeolite subjected to the primary acid treatment is subjected to primary calcination; the beta zeolite after the primary calcination is subjected to secondary acid processing, and the high-silicon-to-aluminum-ratio hierarchical beta zeolite is obtained. The preparing method provided by the invention has the advantages that the operation is simple and efficient, and the prepared high-silicon-to-aluminum-ratio hierarchical beta zeolite has high acid, thermal and hydrothermal stability and good diffusion performance.

Disclosed are a metal single-atom catalyst and a method for preparing the same. The method uses a minimal amount of chemicals and is thus environmentally friendly compared to conventional chemical and / or physical methods. In addition, the method enables the preparation of a single-atom catalyst in a simple and economical manner without the need for further treatment such as acid treatment or heat treatment. Furthermore, the method is universally applicable to the preparation of single-atom catalysts irrespective of the kinds of metals and supports, unlike conventional methods that suffer from very limited choices of metal materials and supports. Therefore, the method can be widely utilized to prepare various types of metal single-atom catalysts. All metal atoms in the metal single-atom catalyst can participate in catalytic reactions. This optimal atom utilization achieves maximum reactivity per unit mass and can minimize the amount of the metal used, which is very economical.

The invention relates to the field of battery manufacturing and energy storage, in particular to an electrochemical treatment method for improving the activity of vanadium cell electrode materials. Graphite felt or carbon felt which is used as anode is immerged in active electrolyte and carries out electrochemical active treatment in an electrobath with a certain current density and time, then the graphite felt or carbon felt is washed and dried for obtaining activated graphite felt or carbon felt electrode material. The method carries out moderate and controllable electrochemical anode activation treatment by choosing suitable activated electrolyte and current density, and overcomes the disadvantages that the stability of the electrode material is deceased owning to overoxidation of the material caused by heat and acid treatment and the service life of the battery is reduced; the method has simple process and low cost. The graphite felt or carbon felt treated by the method is used as electrode and takes a cation-exchange membrane as a diaphragm, and the anode and cathode electrolytes are 1.5M of vanadyl sulfate and 2M of sulphuric acid; after the battery is combined, the ohm internal resistance is greatly reduced, and the current efficiency, voltage efficiency and energy efficiency of the battery are obviously improved.

The present invention belongs to the field of material synthesis technology, and is especially modified no-adhesive ZSM-5 zeolite catalyst and its preparation process and application in catalyzing the dewatering of dilute alcohol solution to prepare ethylene. The catalyst is prepared with no-adhesive ZSM-5 zeolite as basic material and through one modification process combining high temperature water vapor and acid treatment. The catalyst has high content of effective component ZSM-5 zeolite, high molecule diffusion, high crystallization degree, opened channels and great specific surface area. In catalyzing the dewatering of dilute alcohol solution to prepare ethylene, the catalyst has high catalytic activity, low reaction solution ethanol concentration, low reaction temperature, high ethanol converting rate, high ethylene selectivity and high space velocity.

A method for synthesizing nanostructured carbon materials having excellent crystallinity and large surface area using inexpensive metal salts and polymeric carbon precursors are disclosed. The synthetic method comprises the formation of nanostructured carbon material—metal—inorganic oxide composite through catalytic graphitization of a polymeric carbon precursor—metal salt—inorganic oxide composite, removal of inorganic oxide using an etchant, and removal of metal through an acid treatment, wherein an inorganic oxide material is added in the reaction mixture in order to increase the surface area of the nanostructured carbon material, and metal salt is used as a graphitization catalyst. The resultant nanostructured carbon materials possess the characteristics of excellent crystallinity and large surface area, where such characteristics are well suited for low temperature fuel cell electrode applications.

The invention provides a Y-type molecular sieve with an ultra-high mesoporous content and a preparation method of the Y-type molecular sieve. The method comprises the following steps: pre-treating Y-type zeolites for 1-5 hours at 300-600 DEG C; cooling to 200-600 DEG C; in an anhydrous drying environment, introducing dry gas saturated by a dealuminating silicon-reinforcing agent into the pre-treated Y-type zeolites and carrying out reaction for 0.5-7 hours to obtain a coarse product; or in the anhydrous dry environment, raising the temperature at a constant speed to 250-700 DEG C, introducing dry gas saturated by the dealuminating silicon-reinforcing agent into the pre-treated Y-type zeolites simultaneously and carrying out reaction for 0.5-7 hours to obtain a coarse product, wherein the introducing speed of the dry gas saturated by the dealuminating silicon-reinforcing agent is 50mL / minute; carrying out acid treatment on the coarse product; and carrying out alkaline treatment on the coarse product after acid treatment to obtain the Y-type molecular sieve. The invention further provides the Y-type molecular sieve with the ultra-high mesoporous content by virtue of the method. The sieve is the Y-type molecular sieve which is high in silica-alumina ratio, wide in range and high in mesoporous content; and the preparation method is simple to operate and low in raw material cost.

The invention relates to cationic surface active agent modified sagging bar earth manufacturing method. It belongs to high-tech content, high addition value sagging bar earth new product exploitation utilization. It includes the following steps: using sagging bar earth as material to do acid treatment; ion exchanging with sodium ion; and using ultrasonic wave to promote cation exchange. The method can greatly increase modified speed and interaction with organic. The modified sagging bar earth phenol adsorbability can rise by 18 times.

A process for enhancing the productivity of a formation consists of introducing into the formation a viscoelastic fluid which contains at least one surfactant, at least one quaternary amine polyelectrolyte, water, and a non-aqueous solvent. The surfactant forms aggregation structures or vesicles. The fluid, which significantly enhances fluid viscosity and thermal stability, is particularly effective as a diverting fluid to divert an acid treatment package from a high permeability or damaged portion of a formation to a low permeability or undamaged portion of a formation as well as a fracturing fluid. In addition, the fluid is useful for sand control completion.

The use in preparation of a medicament for treating and preventing the side effects of anti-cancer chemotherapy of a polyunsaturated fatty acid with a carbon chain length of 14 to 26 and with 2 to 6 double bonds in the molecule in cis or trans configuration, and a method of such treatment or prevention wherein said fatty acid is used as an active.

The invention discloses a nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst and a preparation method and an application thereof. The catalyst is characterized in that for a structural unit, nitrogen-doped carbon nanotubes (NCNTs) are utilized as a conductive network, and iron-cobalt alloy nanoparticles wrapped by a nitrogen-doped ultrathin carbon layer are loaded on the nitrogen-doped ultrathin carbon layer. The preparation method comprises steps of pretreatment of carbon nanotubes, removing impurities on surfaces of the carbon nanotubesthrough cleaning, and generating a large number of defects and oxygen-containing surface functional groups on the surfaces of the carbon nanotubes through acid treatment; carrying out grafting reaction of an iron-cobalt organic ligand and melamine on the surfaces of the functionalized carbon nanotubes; calcining the iron-cobalt organic ligand and the melamine-grafted functionalized carbon nanotubes under a high-temperature condition to obtain the nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst.

The invention relates to a nitrogen-doped nano carbon electrocatalyst for a fuel cell, and preparation and application of the nitrogen-doped nano carbon electrocatalyst. The electrocatalyst is prepared by adopting the steps of: with phenylamine as a reaction precursor, mixing the phenylamine, a surfactant and a soluble transition metal salt and then polymerizing under acidic and high-oxidization conditions, carrying out high-temperature carbonization on the polymer under the protection of an inert gas and / or ammonia atmosphere after drying, and finally carrying out acid treatment. The preparation method of the electrocatalyst is simply and easily controlled, and the mass production is easily realized. The nitrogen-doped nano carbon electrocatalyst has better oxygen reduction catalytic activity, stability and selectivity in an acidic medium fuel cell compared with Pt / C, and has higher catalytic activity and stability in an alkaline medium fuel cell compared with commercialized Pt / C. In addition, the nitrogen-doped nano carbon electrocatalyst also has the advantages of low cost and high anti-poisoning property, and is capable of replacing platinum to be used as a fuel cell oxygen reduction electrocatalyst.

The invention relates to a method for preparing modified attapulgite by silane coupling agent, belonging to field of developing and using attapulgite. The invention employs attapulgite as raw material, treats it with acid, gets acidified attapulgite; then disperses with supersonic wave, and hydrolyzes silane coupling agent, finally, proceeds dehydration and condensation reaction with hydrolysate of silane coupling agent and attapulgite, and gets said product. The invention employs silane coupling agent to treat attapulgite, and increases the interaction between attapulgite and organic material. It is proved by FTIR that product realizes silane modification, which creats condition for enlarging application range and increasing application value for attapulgite.