36results about How to "Control the degree of oxidation" patented technology

The invention discloses a preparation method of a thin-layer graphene oxide material. As preferable one of embodiments, the preparation method of the thin-layer graphene oxide material comprises the following steps of: sufficiently mixing graphene microchip, acid solvent and oxidant uniformly for reacting under a set temperature; and washing the mixture to be neutral and untrasonically treating the mixture to obtain the thin-layer graphene oxide material. A reducing agent is added to the thin-layer graphene oxide to carry out the reducing reaction to produce the reduced thin-layer graphene oxide material. Furthermore, the obtained thin-layer graphene oxide and the reduced thin-layer graphene oxide are dispersed in a solvent to obtain thin-layer graphene oxide dispersion liquid and reduced thin-layer graphene oxide dispersion liquid. The preparation method disclosed by the invention is simple in process, simple in needed equipment, safe and simple to operate, low in cost, strong in controllability, easy to realize large-scale industrial production, and capable of expanding the different application needs of the graphene oxide.

The invention relates to the field of medicinal preparations, in particular to a dianhydrodulcitol lipidosome freeze-dried powder injection and a preparation thereof. The weight ratio of dianhydrodulcitol to phospholipids to cholesterol in dianhydrodulcitol lipidosome is 1:(5-40):(2.5-15). The weight ratio of dianhydrodulcitol to phospholipids to cholesterol is preferably 1:(10-30):(5-10). The encapsulation rate of the prepared dianhydrodulcitol lipidosome can be 85% or above, and the grain diameter of the prepared dianhydrodulcitol lipidosome is smaller than 200 nm. After administration, the medicine is rapidly absorbed, takes effect rapidly, and is accurate in quantification and convenient to use, the first-pass effect of the oral medicine is avoided, and the treatment effect and bioavailability are improved.

The invention discloses a preparation method of a cross-linking antibacterial acellular matrix material. Oxidized chitosan quaternary ammonium salt is cross-linked with an acellular matrix material, multiple aldehyde groups on oxidized chitosan quaternary ammonium salt are cross-linked with active groups on the acellular matrix, the structural stability of the material is improved, meanwhile, chitosan quaternary ammonium salt is grafted in the acellular matrix material, and therefore excellent antibacterial and bacteriostatic performance is provided for the acellular matrix material. According to the method, cross-linking and providing of the antibacterial performance of the material are combined, the preparation method is a preparation method of the novel functional acellular matrix material, and the method can be widely applied to the field of biological materials.

The invention belongs to the field of pharmaceutical preparations, in particular to a long-chain fat emulsion injection containing olive oil and a preparation method thereof. The fat emulsion comprises an oil phase composed of olive oil, soybean oil and an emulsifier, an aqueous phase composed of water for injection and glycerin, an oleic acid stabilizer, a pH regulator and a fat-soluble antioxidant; the fat emulsion injection consists of water The phase and the oil phase are prepared by ultrasonic emulsification, and the average particle size is about 280±20nm. The invention solves the problems of uneven particle size distribution and oil floating in fat emulsion, greatly reduces the residual oxygen in the emulsion and the oxidation degree of oil phase components, increases the long-term stability of fat emulsion injection, and reduces the adverse effects of patients. reaction, increasing drug safety.

The invention discloses an arc smelting preparation method of an oxide-reinforced platinum-rhodium-based composite material, which comprises: putting a platinum-rhodium alloy composite material ingot containing rare earth Y powder and zirconia powder into an electric arc furnace, and performing arc smelting to obtain Button-shaped ingot; use X-ray fluorescence analysis instrument to measure whether the Zr and Y content on both sides of the ingot is uniform, if not, place the bottom of the ingot upwards and perform arc melting. After several times of melting, the Zr and Y content on both sides of the ingot will be uniform; The obtained ingot is hot-rolled and then annealed; then rolled, drawn and heat-treated to prepare a wire or sheet product to obtain an oxide-reinforced platinum-rhodium-based composite product. The invention has simple preparation process, no pollution to the environment, controllable composition of the prepared composite material, excellent comprehensive performance of the material, and is suitable for industrial production. The obtained composite material can be applied to electrothermal materials, electrode materials and the like.

An embodiment of the present invention provides a color metal comprising: a metal substrate comprising a first metal; an oxidation degree control pattern disposed on the metal substrate, the oxidationdegree control pattern increasing or decreasing the oxidation degree over time of the first metal; and a coating film disposed on the metal substrate on which the oxidation degree control pattern hasbeen disposed, wherein a first region of the metal substrate, on which the oxidation degree control pattern is present, and a second region of the metal substrate, on which the oxidation degree control pattern is not present, display different colors due to a difference in oxidation degree over time.

The invention discloses a continuous preparation and purification device for graphene oxide, which includes a reactor, a concentrated sulfuric acid solution storage bottle and a water / hydrogen peroxide storage bottle connected to the reactor through a delivery pipe, and a three-way valve is arranged on the delivery pipe. Directly below and directly above are correspondingly equipped with an ultrasonic plate, a feeder, a stirring paddle, and a first lifting platform connected to the reactor through a discharge pipe, and the discharge pipe is connected to the filter column through a second conveying pipe provided with a second peristaltic pump. The filter column is connected to the graphene oxide storage bottle through the third conveying pipe provided with the third peristaltic pump; the invention also discloses a preparation method of graphene oxide: the strong acid and the oxidant are separately fed and oxidized with graphite, and then stripped and purification to obtain graphene oxide. The device of the present invention is provided with a concentrated sulfuric acid solution storage bottle, a feeder, a reactor and a filter, and realizes the continuous preparation and purification of graphene oxide; the method of the present invention improves the preparation and purification efficiency of graphene oxide, and realizes concentrated sulfuric acid Solution recovery and continuous utilization.

The invention provides a method for preparing a non-conventional refractive index mixed thin film based on magnetron sputtering, which belongs to the technical field of optical thin films. In the present invention, the unconventional refractive index mixed material is deposited by pulsed DC magnetron sputtering, specifically, the cathode is used to jointly sputter tantalum and silicon targets, and a radio frequency ion source is used to ionize oxygen in the same chamber, so that they are jointly deposited on the surface of the substrate. Reaction film. Because the thin film prepared by magnetron sputtering technology has a denser structure than that of thermal evaporation, its durability and stability are better than those of thermal evaporation deposition.