68 results about "Anodization voltage" patented technology

The invention discloses a manufacture method for a chlorine-evolution DSA electro-catalytic electrode with a three dimensional structure. The method includes a titanium substrate is preprocessed, and a titanium substrate titanium dioxide nanotube is manufactured; an anodic oxidation unit is used to fix the preprocessed titanium substrate on an anode and fix an iridium tantalum electrode on a cathode, the electrolyte temperature is kept in a range from 30 DEG C to 50 DEG C, the anode oxidation time is in a range from 80 minutes to 180 minutes, and the anode oxidation pressure is in a range from 15V to 35V; a hydrothermal reaction is performed; a isopropyl alcohol solution of SnCl4, SbCl3 and RuCl3 is prepared, and the titanium substrate titanium dioxide nanotube is placed in a reaction kettle vertically; the nanotube is reacted for 20h to 50h at a temperature of 100 DEG C to 250 DEG C; and thermal treatment is performed to obtain the electrode. According to the method, tedious painting and thermal decomposition processes are not included, the chlorine-evolution DSA electro-catalytic electrode with the three dimensional structure manufacture without has the advantages of being uniform and compact in surface, high in active component load, high in electrochemical activity, and long in service life.

The invention discloses a hexagonal thin-wall anodic aluminum oxide film with large aperture. The aperture of the anodic aluminum oxide is 200 to 300 nanometers, and the thickness of the hole wall is 5 to 20 nanometers. A method for preparing the film comprises the following steps: ultrasonically cleaning an aluminum sheet for 10 minutes by acetone, ethanol and high-purity water in turn, putting the cleaned aluminum sheet into mixed electrolyte in which the mass percentage of phosphoric acid to acetic acid is (10-1):(1-10) percent, and anodically oxidizing the aluminum sheet for 1 to 5 minutes under the voltage of 40 to 160 volts; then, cleaning the obtained anodic aluminum oxide film by the high-purity water, and soaking the cleaned anodic aluminum oxide film in mixed solution of 0.2 mol / L chromic acid and 0.4 mol / L phosphoric acid for 20 minutes at the temperature of 60 DEG C; anodically oxidizing the anodic aluminum oxide film for the second time for 5 minutes to 10 hours under the condition of the same mixed electrolyte and anodic oxidizing voltage as the first anodic oxidization; and soaking the obtained anodic aluminum oxide film into 10 percent phosphoric acid solution in percentage by mass for 20 minutes, finally cleaning the anodic aluminum oxide film by the high-purity water, and drying the anodic aluminum oxide film by nitrogen.

The invention relates to a method for preparing a self-supporting through-hole alumina film by cathode electrolysis process in the neutral aqueous solution, which belongs to the physical material field. An electropolished metallic aluminum sheet is oxidated by an anodic oxidation method to form an alumina film on the surface thereof, a barrier layer separates the porous alumina film from a metallic aluminum substrate, the thickness thereof meets the linear relation of 1.4nm / V to the constant-pressure corrosion condition; the barrier layer is thinned by adopting a current reversion method, as the thickness of the barrier layer is proportional to the anode oxidation voltage, reducing the oxidation voltage gradually can effectively lower the thickness of the barrier layer, the alumina film can be peeled off by lower cathode electrolysis voltage; at last a cathode electrolysis method is adopted to electrolyze the peeled film and through holes in neutral potassium chloride aqueous solution, the self-supporting through-hole alumina film can be fully peeled off from the aluminum substrate to obtain a product. The method has the advantages of simple operation, low energy consumption, no environment pollution and so on. The product has broad prospects in the aspects of nanometer material synthesis and nanometer device application.

The fast stable growth process of alumina film with nanometer pore array in relatively great pore distance includes the following steps: 1. compounding electrolyte solution with H3PO4, C2H5OH and water; 2. pre-treating aluminum sheet through soaking in acetone, wipping, rinsing with deionized water and electrochemical polishing with mixed solution of perchloric acid and ethanol; 3. the first etching of the aluminum sheet in the electrolyte solution at -5 to -10 deg.c under the action of anode oxidizing voltage of 195V and current density of 1500-4000A / sq m; 4. soaking the aluminum sheet in water solution of chromic acid at 60 deg.c to eliminate alumina generated in the first etching; and 5. the second etching of the aluminum sheet in the same condition as that in the step 3.

A nano structure having pore array structures in which a plurality of periodic arrays are formed adjacent to one another and a method of manufacturing the nano structure are provided. A nano structure having periodic array structures of pores formed in an anodized oxide film with a plurality of types of the periodic array structures arranged adjacent to one another is provided. Furthermore, a method of manufacturing a nano structure in which a plurality of periodic array structures formed in an anodized oxide film having different periods are arranged adjacent to one another, including (1) a step of forming pore starting points made up of a plurality of types of periodic arrays on the surface of a substrate comprised of aluminum as a principal component and (2) a step of anodizing the substrate simultaneously at the same anodization voltage is provided.

A single sheet type monodirectional liquid micropump with the microvalve having suspended T-shaped valve membrane is prepared on the basis of anodizing voltage switching technique and monosilicon film transfer technique. Its advantages are low energy consumption for opening it and high borne pressure when it is closed.

The invention discloses a method for preparing a large-hole-interval porous anodic alumina membrane at high voltage. The method includes the steps that a high pure aluminum sheet is subjected to electrochemical polishing after being washed; the polished aluminum sheet serves as an anode, graphite serves as a cathode, the anode oxidation process is performed while an oxalic acid-ethanol-water mixed solution serves as an electrolyte, and high anode oxidization voltage is obtained by performing self-adaption boosting under constant current density; a sample obtained through anode oxidization is soaked in a saturated copper chloride solution, then the large-hole-interval porous anodic alumina membrane is obtained, and the average hole interval of the prepared porous anodic alumina membrane is regulated and controlled by adjusting the ethanol adding proportion, the anode oxidization voltage and the current density. The large hole interval size of the prepared porous anodic alumina membrane is adjustable so that the porous anodic alumina membrane can serve as a template to synthesize various functional submicron and micron materials. Meanwhile, the large-hole-interval porous anodic alumina membrane has the advantages that raw materials are easy to obtain, operation is easy, cost is low, and repeatability is good, and feasibility is improved when the large-hole-interval porous anodic alumina membrane is applied to production.

The invention discloses a preparation method of a titanium dioxide core / shell nanometer cable array. The method comprises: firstly, preparing a layer of TiO2 nanotube array film with small tube diameter on a titanium chip under a low oxidation voltage; and then, increasing the anode oxidation voltage, and obtaining a titanium dioxide nanotube array with large tube diameter below the titanium dioxide nanotube array with small tube diameter; performing ultrasonic oscillating; soaking the titanium dioxide nanotube array with a titanium chip substrate in a high-concentration alkaline solution, and cleaning the titanium dioxide nanotube array through deionized water; and soaking the titanium dioxide array in an acid solution for a period, taking out the titanium dioxide array, cleaning the titanium dioxide array with deionized water, and drying the titanium dioxide array to obtain the titanium dioxide core / shell nanometer cable array. The method is simple, feasible, quick and effective, the shape and outline of the product are controllable, and the method has practical value.

The invention discloses an electrochemical method for preparing a mesoporous tungsten trioxide film. The method comprises the steps that metal tungsten subjected to pretreatment is taken as an anode,a titanium sheet or a platinum sheet serves as a cathode, in an electrolyte, constant-potential anodic oxidation is performed for 1-7 hours under the condition that the temperature ranges from 5 DEG Cto 40 DEG C and the voltage ranges from 3 V to 15 V, and then the metal tungsten is taken out to be cleaned and dried to obtain the mesoporous tungsten trioxide film on the surface of the metal tungsten. According to the electrochemical method, the tungsten trioxide films with different pore diameters can be obtained on the surface of the metal tungsten by controlling the electrolyte component, the anodic oxidation voltage and the oxidation time; the prepared tungsten trioxide film has a remarkable mesoporous structure, the specific surface area is large, and the prepared tungsten trioxide film is firmly combined with a metal tungsten substrate and is not prone to fall off; and the electrochemical method is simple in preparation process, low in cost, simple and convenient to operate, highin efficiency and wide in application prospect in the aspect of industrial application.

The invention relates to a preparation method of a double-layer titanium dioxide nanotube thin film with a pear-shaped structure. The double-layer titanium dioxide nanotube thin film is prepared by immersing medical titanium in an ethanediol electrolyte solution containing 0.1 to 0.9wt% of NH4F and 0 to 10vol% of H2O for one-step in-situ boost anodic oxidation. The preparation method comprises following steps: firstly, an anodic oxidation voltage is raised from 0V to 20-40V, and is kept for 80min to 6h; then the anodic oxidation voltage is continuously raised to 50-90V, and is kept for 10min to 1h; and at last the double-layer titanium dioxide nanotube thin film with the pear-shaped structure is formed on the surface of the medical titanium. The preparation method is simple and quick, is convenient for operation, is possible to be used in the fields of surface modification of titanium-based implants used in orthopaedics, dentistry, plastic surgery departments, and is capable of reducing risks of failure after implanting and increasing osseointegration ability of the implants.