摘要:
A composite of a rigid, glassy, permeable membrane of a silyl or germyl-containing polyacetylene and a thin surface layer of a plasma polymerized monomer having pendant nitrogen heterocycles is provided; the composite has high flux and selectivity and is particularly useful for separating gas mixtures containing at least two components having different permeabilities through the composite structure.
摘要:
Polymers having a substantially completely fluorinated surface of low surface energy and substantially free of oxygen and having a thickness up to about 200 Angstroms, the remainder of the polymer comprising a non-fluorinated polymer.
摘要:
The present invention is for extremely pure solutions of chlorine dioxide, methods for making such solutions and to compositions and methods for storing, shipping and using such solutions. Generally, the chlorine dioxide solutions of the invention are aqueous solutions containing about 2500 ppm or less of total impurities. The chlorine dioxide solution can be prepare by passing dilute highly pure chlorine gas through a bed of substantially solid sodium chlorite and contacting the resulting chlorine dioxide gas with a liquid.
摘要:
The present invention is for extremely pure solutions of chlorine dioxide, methods for making such solutions and to compositions and methods for storing, shipping and using such solutions. Generally, the chlorine dioxide solutions of the invention are aqueous solutions containing about 2500 ppm or less of total impurities. The chlorine dioxide solution can be prepare by passing dilute highly pure chlorine gas through a bed of substantially solid sodium chloride and contacting the resulting chlorine dioxide gas with a liquid.
摘要:
The present invention is for extremely pure solutions of chlorine dioxide, methods for making such solutions and to compositions and methods for storing, shipping and using such solutions. Generally, the chlorine dioxide solutions of the invention are aqueous solutions containing about 2500 ppm or less of total impurities. The chlorine dioxide solution can be prepare by passing dilute highly pure chlorine gas through a bed of substantially solid sodium chloride and contacting the resulting chlorine dioxide gas with a liquid.
摘要:
Methods and apparatus relate to catalysts and preparation of the catalysts, which are defined by sulfides of a transition metal, such as one of molybdenum, tungsten, and vanadium. Precursors for the catalysts include a metal ion source compound, such as molybdenum trioxide, and a sulfide ion source compound, such as thioacetamide. Once the precursors are dissolved if solid and combined in a mixture, homogenous precipitation from the mixture forms the catalysts. Exemplary uses of the catalysts include packing for a methanation reactor that converts carbon monoxide and hydrogen into methane.
摘要:
A method for size selection of nanostructures comprising utilizing a gas-expanded liquids (GEL) and controlled pressure to precipitate desired size populations of nanostructures, e.g., monodisperse. The GEL can comprise CO2 antisolvent and an organic solvent. The method can be carried out in an apparatus comprising a first open vessel configured to allow movement of a liquid/particle solution to specific desired locations within the vessel, a second pressure vessel, a location controller for controlling location of the particles and solution within the first vessel, a inlet for addition of antisolvent to the first vessel, and a device for measuring the amount of antisolvent added. Also disclosed is a method for forming nanoparticle thin films comprising utilizing a GEL containing a substrate, pressurizing the solution to precipitate and deposit nanoparticles onto the substrate, removing the solvent thereby leaving a thin nanoparticle film, removing the solvent and antisolvent, and drying the film.
摘要:
A floating gate electrically erasable MOS transistor comprising a silicon substrate having source and drain regions and a channel region disposed between the source region and the drain region. The source and drain regions are formed from a semiconductor material having one conductivity type, and the channel region is formed from a semiconductor material having a conductivity type opposite the conductivity type of the semiconductor material forming the source and drain regions. A control gate region is formed in the silicon substrate horizontally spaced apart from the channel region. The gate region is formed from a semiconductor material having the same conductivity type as the semiconductor material forming the source and drain regions. A polysilicon layer bridges the control gate region and the channel region for communicating an electrical potential from the first gate region to the channel region. A silicon dioxide layer is disposed between the polysilicon layer and the control gate and channel regions for insulating the polysilicon layer from these regions. The polysilicon layer thus serves the function of a floating gate, and is selectively controlled through the first gate region for forming a conductive channel between the source and drain regions. The drain region of the MOS transistor is coupled to the base terminal of a bipolar sensing transistor for forming an EEPROM.
摘要:
A process of modifying a zeolite catalyst to produce a modified zeolite catalyst wherein the modified zeolite catalyst has blocked pore sites. An oxygenated feed is flowed over the modified zeolite catalyst, wherein the oxygenated feed comprises hydrocarbons, methanol and dimethyl ether or a mixture thereof. The hydrocarbons, methanol and dimethyl ether in the oxygenated feed react with the modified zeolite catalyst to produce cyclic hydrocarbons, wherein the cyclic hydrocarbons produced has less than 10% durene and a median carbon number is C8.
摘要:
A method of producing a MoS2 catalyst. The method begins by the decomposition of ammonium tetrathiomolybdate in an organic solvent. This decomposition is done in the presence of a solution comprising: a solvent and a promoter, and done under gaseous pressure.