448 results about "H2O2 - Hydrogen peroxide" patented technology

Dental bleaching systems that include a bleaching component and a neutralizing component which, when mixed together, yield a mixed composition having a desired bleaching activity and viscosity. The bleaching composition includes a suitable bleaching agent, such as aqueous hydrogen peroxide, in a concentration of about 3% to about 95% by weight of the bleaching composition component. The neutralizing component includes a particulate base dispersed within a stable gel that includes at least one polymeric thickening agent. The neutralizing component is substantially water-free to prevent destruction of the gelling capability of the thickening agent by the base. The particulate base may include oxides, hydroxides or carbonates of alkali metals or alkaline earth metals. Maintaining the bleaching agent and neutralizing agent in separate components provides increased stability during storage and transport.

The present invention provides an assembly for the preparation of a medical device having a porous coating comprising hydrogen peroxide. Particularly interesting medical devices are catheters (such as urinary catheters), endoscopes, laryngoscopes, tubes for feeding, tubes for drainage, guide wires, condoms, urisheaths, barrier coatings e.g. for gloves, stents and other implants, extra corporeal blood conduits, membranes e.g. for dialysis, blood filters, devices for circulatory assistance, dressings for wound care, and ostomy bags. The coating is in particular a hydrophilic coating formed from cross-linked polyvinylpyrrolidone. In one embodiment, the assembly holds a dry catheter element in one compartment of a package and an aqueous hydrogen peroxide solution in another compartment. The solution may also comprise stabilizers, e.g. chelators, and osmolality increasing agents. The catheter for insertion in the urethra is useful for the treatment, alleviation or prophylaxis of microbial infections such as urinary tract infections (UTI).

A decontamination system for decontaminating a region with a vaporized decontaminant, such as vaporized hydrogen peroxide. The concentration of the vaporized decontaminant within the region is modified in response to operating conditions. The decontamination system adjusts the concentration of the vaporized decontaminant in response to the monitored saturation concentration of the decontaminant, thereby preventing condensation of the vaporized decontaminant during a decontamination cycle. The decontamination system also adjusts the concentration of the vaporized decontaminant in order to minimize the time required to complete a successful decontamination operation.

The invention discloses a stepped method for detecting the concentration of a hydrogen peroxide solution. The stepped method includes the following steps that 1, a photothermal conversion material reacting with hydrogen peroxide is used for modifying a nanometer material containing a rare earth element, so that a functional rare earth nanometer material is obtained; 2, a series of hydrogen peroxide solution with the standard concentration reacts with the functional rare earth nanometer material to obtain a series of mixed solution, the luminous intensity, ultraviolet-visible light absorption intensity and photo-thermal heating temperature of the mixed solution are detected, and a standard curve of the luminous intensity, ultraviolet-light absorption intensity, heating temperature and concentration is drawn; 3, the hydrogen peroxide solution with unknown concentration reacts with the functional rare earth nanometer material to obtain a mixed solution, a detecting mode is determined, corresponding data is determined, and the concentration can be obtained through comparison with the standard curve. The detection limit is effectively lowered, and meanwhile the linear detection range is promoted. The material is simple, an instrument is low in price, and the stepped method can be used for detecting foods, medicine, living body samples and other samples.

The invention relates to a configuration of an air diffusion cathode for efficiently producing hydrogen peroxide and a preparation method thereof. The method mainly comprises the following steps: coating a carbon fiber by using a mixed solution of polytetrafluoroethylene and carbon black, so as to prepare an air cathode sheet, and then assembling the air cathode sheet according to a certain configuration. The air diffusion cathode has good H2O2 yield and current efficiency, is low in requirements of air aeration quantity, convenient to run, small in energy consumption, low in price, and stable in property, selects a carbon fiber and a carbon black material, and has high practical application value.

This invention discloses a method for preparing low-sulfur diesel oil (sulfur content is less than 50 ppm). The method comprises: (1) stirring hydrogenated or unhydrogenated diesel oil and a mixture of Q+[MWxOy]- emulsion catalyst and H2O2 aqueous solution, and reacting under mild conditions to convert organic sulfide in diesel oil into sulfone and/or sulfoxide to obtain oxidized diesel oil; (2) separating the catalyst from oxidized diesel oil, and recovering; (3) washing oxidized diesel oil with distilled water, and removing most of sulfone and/or sulfoxide with a polar solvent to obtain low-sulfur diesel oil (sulfur content is less than 50 ppm).

The invention discloses a manufacture method of a gold plated copper thermode and application of the thermode on a temperature-controllable H2O2 sensor, comprising manufacture of the gold plated copper thermode, formation of a G-quadruplex-hemin complex and a high-sensitivity detection method for hydrogen peroxide by an electrochemical sensor based on the thermode and the G-quadruplex-hemin complex. Based on the high-temperature resistance feature of G-quadruplex-hemin DNA (Deoxyribonucleic Acid) enzyme, electrochemical catalysis response of the hydrogen peroxide on the sensor increases gradually with temperature rising (0-50 degrees centigrade). The electrochemical hydrogen peroxide sensor based on the thermode and G-quadruplex-hemin DNA enzyme provided by the invention can be used in a wide temperature range, has high sensitivity and can realize rapid detection on hydrogen peroxide.

The invention discloses a hydrogen peroxide measurement method based on N-acetyl-L-cysteine-gold nanoclusters, and relates to a hydrogen peroxide measurement method which takes the gold nanoclusters protected by N-acetyl-L-cysteine as a fluorescent probe. The method is characterized in that the fluorescent light of the gold nanoclusters is quenched by utilizing hydroxyl radicals generated by catalyzing H2O2 through Fe<2+>, so that the characteristic of a fluorescence emission spectrum is changed, and the method can be used for detecting H2O2. Delta F650 and the concentration of H2O2 have a linear relation within the range of 0.044-6.66 micromole/ L, and the limit of detection is 27 nmol/ L. The method is high in sensitivity and good in reproducibility, and can be used for measuring H2O2 in food, industry, environment and a living system.

The invention discloses a method and device for preparing an electrocatalytic H2O2 solution. The preparation method comprises the following steps: (1) electrolyzing water at an anode to generate H<+> and O2, and electrolyzing oxygen at a cathode to obtain HO<2->; (2) allowing H<+> and HO<2-> to enter a solid electrolyte layer respectively through a cation exchange membrane and an anion exchange membrane to directly synthesize H2O2; and (3) introducing water into the solid electrolyte layer, and taking out H2O2 by utilizing the water. The device comprises the anode, the cathode and a storage tank, wherein the solid electrolyte layer is arranged between the anode and the cathode, the storage tank is connected to the solid electrolyte layer, an anode flow channel, an anode collector plate, a gas diffusion layer, an anode catalyst layer and a cation exchange membrane are sequentially arranged in the anode, and the IrO2/GCN cation exchange membrane is tightly attached to the surface of the solid electrolyte layer. According to the preparation method, water and oxygen are used as raw materials, and no organic solvent is added, so a preparation process is green and environmentally friendly; and high-concentration hydrogen peroxide can be directly generated and purification is not performed, so the risk of the preparation process is reduced.