46 results about "Photodissociation" patented technology

The invention relates to a preparation method for an alkali tantalate based composite visible-light photocatalyst in hydrogen production by water splitting, in particular to a method that ammonia is used as the nitrogen source to perform nitrogen doping on the alkali tantalate at high temperature. The method has the following steps: (1) dissolving the tantalum-containing precursor in the surfactant acidic solution to produce a uniform tantalum salt solution; (2) adjusting the PH value to 6-9 and adding the hydroxide of an alkali metal to produce a suspension; (3) water-heating the produced suspension in a reaction kettle to produce the alkali tantalate crystal and (4) treating the crystal with the ammonia to produce the alkali tantalate, and then obtaining the nitrogen doped alkali tantalate. The photocatalyst treats the alkali tantalate by high-temperature ammonolysis, which realizes nitrogen doping to the alkali tantalate. The experiment shows that the alkali tantalate is nitrogen doped in the preparation process which has good visible light catalysis and solves the problem of nitrogen doping to the alkali tantalate.

A method for the ultra-fast photodissociation of water molecules into H₂ and O₂ gases is presented. Water vapor is initially produced and supplied to a photolysis bottle. Within the photolysis bottle, the water vapor is illuminated by a light signal to dissociate H₂ and O₂ gases from the water vapor. The dissociated H₂ and O₂ gases are radiated with an RF signal to inhibit recombination of the dissociated H₂ and O₂ gases, and the dissociated H₂ and O₂ gases are subsequently recovered.

The invention discloses a photodissociation method of a benzothiophene compound for oxidative desulfurization. According to the method, the benzothiophene compound reaches C-S bond fracture reaction under the existence of an oxidizing agent and metal phthalocyanine or metalloporphyrin through illuminating reaction. According to the method disclosed by the invention, under the mild conditions of normal temperature and pressure, the most stable sulfide, namely the benzothiophene compound in an oxidized petroleum product reaches the C-S bond oxidation fracture in the benzothiophene compound, so as to obtain a sulfocompound with relatively strong polarity and sulfur-free hydrocarbon oxide. The conversion ratio of the C-S bond fracture reaches over 90% when metalloporphyrin is a catalyst, and the problems that the C-S bond oxidation fracture reaction in the benzothiophene compound at present needs high temperature, high pressure and a special catalyst, and is high in demands on equipment, and low in productive rate are overcome.

The invention discloses a molecular photodissociation ionization velocity imaging device and relates to a device which uses the ion velocity imaging technology for carrying out slicing and imaging on positive and negative ions and electronic three-dimensional information. The device comprises an inert gas carrier gas source, a pressure reducing valve, a sample cell, a vacuum cavity, a pre-stage dry pump, a molecular pump, a pulse valve, a skimmer, an ion lens group, a micro-channel plate, a fluorescent plate, a CCD camera, a computer and a synchronized laser source. The device designs an ion lens in the traditional ion velocity imaging system to the multi-stage ion lenses and combines the micro-channel plate with rapid response, the fluorescent plate and the enhanced CCD camera with ultra-high time resolution, thereby greatly extending an ion cloud on time scale, leading the ion slicing and imaging precision to achieve 5ns, improving the time resolution, solving the problem of image blur and reducing the cost.

A MALDI mass spectrometer includes a radiation source, such as a gas or solid state laser, that emits a beam of radiation (typically in the UV or IR wavelengths) directed along the central axis of a linear ion trap in which analyte ions and matrix cluster ions are confined. The radiation beam has a wavelength that is strongly absorbed by the matrix cluster ions. The absorption of radiation by the matrix cluster ions produces dissociation of the matrix cluster ion into fragments having mass-to-charge ratios that lie below a mass-to-charge ratio range of interest. Thus, chemical noise associated with matrix cluster ions is reduced or eliminated.

The object of the present invention is to provide an oxygen isotope concentration method capable of concentrating the stable oxygen isotopes of ¹⁷O and ¹⁸O which can be carried out using a simple device configuration.

The present invention relates to a method for concentrating an oxygen isotope in separated oxygen by irradiating ozone with light, selectively dissociating an isotopomer of ozone containing an oxygen isotope in its molecule into oxygen, followed by dissociating the ozone and separating the formed oxygen from the non-dissociated ozone. The basic configuration of the device is provided with an ozone formation unit 11 that forms ozone from raw material oxygen, an ozone separation unit 12 that separates ozone formed with said ozone generation unit and raw material oxygen, an ozone photodissociation unit 13 that radiates light of a specific wavelength onto the ozone separated by said ozone separation unit 12 and selectively dissociates ozone containing an oxygen isotope in its molecule into oxygen, and an oxygen separation unit that separates the oxygen formed by dissociating ozone in said ozone photodissociation unit 13 and non-dissociated ozone to concentrate the oxygen isotope in the oxygen. The present invention also relates to a method for concentrating an oxygen isotope comprising an ozone photodissociation step, in which light is radiated onto a rare gas-ozone mixed gas containing ozone and at least one type of rare gas selected from krypton, xenon and radon to selectively dissociate ozone containing a specific oxygen isotope in its molecule into oxygen, and an oxygen isotope concentration step, in which the oxygen separated from ozone in said ozone photodissociation step is separated from non-dissociated ozone and rare gas to concentrate the oxygen isotope present in the separated oxygen. An oxygen isotope may also be concentrated in a dissociation reaction product by irradiating a gas containing a peroxide selected from hydroperoxides, (di)alkyl peroxides, peroxyacids including peracids, (di)acyl peroxides, peroxy esters, peroxycarbonates, peroxydicarbonates, diperoxycarbonates, peroxalates, cyclic peroxides, ozonides and endoperoxides, nitrite esters and nitrate esters, and selectively dissociating a peroxide containing a specific oxygen isotope in its molecule.

An apparatus, method, and frame window configured to clean mesa sidewalls of a template with photodissociation radiation. Material on the mesa sidewalls are removed from the mesa sidewalls by exposing the portion of a first gap adjacent to the mesa sidewalls to the photodissociation radiation.

A process and apparatus are provided for converting methane to higher hydrocarbons, especially for converting economically stranded natural gas to a transportable liquid hydrocarbon product mainly comprised of C3+ hydrocarbons, comprising applying ultraviolet light to methane (or to the natural gas containing the methane) under conditions effective to cause its photodissociation and polymerization to C2+ and higher hydrocarbons.

The invention discloses a method for injecting a low-energy electron treatment polluted water body into water. A low voltage is applied to an electrode material in a water body, low-energy electrons are released from the electrode material, pollution complexes in the water body are gradually dispersed or dissociated under the induction action of negative electrons, and then the sizes of pollutantscan be gradually reduced through dispersion; the water body suffering from the induction action of the negative electrons is placed under sunshine, photolysis and photocatalysis are implemented through sunshine ration, the complexes can be further digested under the action of photolysis, and meanwhile, active dissolved oxygen is generated under the action of photocatalysis, so that pollutant components in a polluted water body can be reduced, and dissolved oxygen indexes can be increased to standard saturation concentrations or above. By adopting the method, the problem that toxic and harmfulpollutants in a conventional water body are not effectively treated can be solved.

The invention discloses a camptothecin preparation capable of inhibiting organism endothelial cell differentiation, and an application, and belongs to the technical field of plant source pesticides. The camptothecin preparation is characterized by comprising 0.5-2.3% of camptothecin extract dry powder, 1.2-5.3% of inorganic base, 82-97% of solvent, 0.7-2.1% of synergist and 1-5% of stabilizer. According to the camptothecin preparation capable of inhibiting the organism endothelial cell differentiation, and the application, a substance after a camptothecin extract reacts with the inorganic base serves as an active component, a certain synergistic component and a certain stabilizing component are added, and the obtained preparation participates in a process of inhibiting the organism endothelial cell differentiation, so that growth and development of injurious insects are inhibited; when the camptothecin preparation serves as a pesticide in a field, photodissociation and loss of the active component in an environment can be reduced, the biological activity can be exerted enduringly, and effects of organism endothelial cell differentiation inhibition and field disease and insect damage control are exerted; and the camptothecin preparation is convenient to prepare, low in cost, stable in effect, and less in dosage.

A method is described that involves simplification of UVPD mass spectra and comprises selecting precursor ions for UVPD fragmentation, performing UVPD fragmentation on selected precursor ions to give UVPD fragment ions. PTR may then be performed on the UVPD fragment ions with optional ion parking to yield charge-state reduced UVPD fragment ions. The UVPD-PTR steps may be repeated above n times where n=1 to 50. Ion parking may enhance the intensity of selected lower fragment ion charge states or to increase the intensity of peaks in selected m/z ranges. After a number of PTR-UVPD iterations, fragment ions are mass analyzed. The method provides a way of simplifying UVPD mass spectral product ions by lowering fragment ion charge states and spreading out resulting product ions in m/z mass spectral space when compared to using UVPD fragmentation alone.

The invention discloses a method for producing transparent conducting film glass. The method comprises the following steps: (1) introducing a gaseous-state shielding layer precursor containing silane and an oxygen source to the glass surface at a temperature ranging from 460 to 480 DEG C by taking an inert gas as a carrier in an annealing kiln, carrying out photodissociation of the gaseous-state shielding layer precursor by use of a parallel incident laser beam and thus carrying out a chemical vapor reaction to form a shielding layer which is 50-90nm thick on the glass surface; (2) in the annealing kiln and in the glass temperature range of 435-455 DEG C, introducing a gaseous-state conducting layer precursor containing pre-gasified zinc and aluminum sources and the oxygen source to the glass surface on which the shielding layer is already deposited by taking the inert gas as the carrier, and causing the photodissociation of the gaseous-state conducting layer by use of the parallel incident laser beam and thus carrying out the chemical vapor reaction to form a conducting layer which is 250-400nm thick on the glass surface. The method has the advantages that the temperatures of the coating reactions are effectively reduced so that the quality of the film can be improved, and the utilization rate of the precursor gases is increased so that the working conditions of a float line can be kept stable.

The invention discloses sunscreen lotion and a preparation method thereof, belonging to the technical field of cosmetic production. According to the preparation method, arabinoxylan is used as a raw material to obtain an anti-ultraviolet (UV) light active agent, so that molecules are enabled to have a higher ultraviolet absorption capacity in a UVB band, the sunscreen lotion is strong in ultraviolet absorption in a range of 250-320nm, good in light stability and higher in safety factor to the skin, and the irritation is greatly reduced; a stable emulsifying active agent, formed by carrying outhydrogenation on lecithin in presence of a Pd/C catalyst, can play roles of moisturizing, emulsifying and dispersing, resisting oxidation, and the like; the emulsifying active agent can also be usedas a surfactant and can also be used for conditioning the skin; cortex magnoliae officinalis, phyllostachys pubescens leaves and herba speranskiae tuberculatae are added into the sunscreen lotion, sothat the shelf life of the sunscreen lotion is prolonged, the safety performance of the sunscreen lotion is improved, and the problem that the protective effect of a sun-screening agent is reduced byphotodecomposition, so that sunscreen products need to be repeatedly applied within a short time can be solved. The sunscreen lotion provided by the invention solves the problems that the existing sunscreen lotion is high in irritation, easily causes allergy, and is poor in moisturizing effect on the dry skin after being applied.