49results about How to "Chemical stability" patented technology

A photo detector includes a photoelectric conversion layer having a periodic structure made of a semiconductor material on a surface of the photoelectric conversion layer. In the photo detector, at least a part of a resonance region formed by the periodic structure is included in the photoelectric conversion layer of the photo detector.

The present invention relates to composite solid polymer electrolyte membranes (SPEMs) which include a porous polymer substrate interpenetrated with an ion-conducting material. SPEMs of the present invention are useful in electrochemical applications, including fuel cells and electrodialysis.

Disclosed are heat transfer fluids which possess a highly desirable and unexpectedly superior combination of properties, and heat transfer systems and methods based on these fluids. The heat transfer fluid comprise from about 30 to about 70 percent, on a molar basis, of carbon dioxide (CO2) and from about 30 to about 70 percent, on a molar basis, of hydrofluorocarbon (HFC), preferably HFC having one to two carbon atoms, and even more preferably difluoromethane (HFC-32). The preferred fluids of the present invention have a vapor pressure of at least about 100 psia at 40° F. and are also preferably not azeotropic.

A metal precursor powder, a method of manufacturing a conductive metal layer or pattern, and an electronic device including the same, are provided, and in the metal precursor powder, the Gibbs free energy change of hydrogen removal at a temperature range of −25° C. to 25° C. is −100 kJ / mol to 300 kJ / mol.

The invention features an immobilized enzyme wherein an enzyme or an active unit of the enzyme is immobilized in a structural unit having structural stability; namely, the present invention provides an immobilized enzyme comprising: a structural unit having structural stability; and an enzyme having an active unit, the enzyme, or the active unit being immobilized in the structural unit; in the preferred aspects, the structural unit is a porous substance having homogeneous pores, a pore size (diameter) of the porous substance of the structural unit is almost the same as that of the enzyme to be immobilized or the active unit of the enzyme, and the structural unit comprises a mesoporous silica porous material to be formed via a layered silicate.

This invention relates to nitroproline derivative compounds and procedures for their preparation and the preparation of pharmaceutical compositions containing the compounds. The invention also relates to the administration of compounds of the invention as agents for the treatment of mammalian diseases whose pathogenic and pathophysiological mechanisms depend on or are significantly contributed by undesirable cellular and molecular activities or responses induced by integrin-dependent molecular interactions.

A particulate material for chromatographic use comprising silica particles is provided having a skeleton structure containing silsesquioxane cage moieties. The material is useful as a chromatographic material, for example in HPLC. The silica particles may be hybrid organo-silica particles wherein the silsesquioxane moieties comprise a cage structure having silicon atoms positioned at corners of the cage wherein one or more silicon atoms positioned at the corners of the cage carry an organic group. A preferred method of preparing the particulate material comprises hydrolysing a silsesquioxane as a co-component of a hydrolysis mixture, especially in a Stöber or modified Stöber process.

The current invention discloses a drug delivery system allowing monitoring of spatial position and drug release, as well as methods and uses thereof. More particularly, the drug delivery system comprises drug carrying particles comprising novel combinations of magnetic resonance imaging contrast agents.

This invention discloses a method for preparing 2, 3-dichloro-5-trichloromethyl pyridine. The method comprises: utilizing 2-chloro-5-trichloromethyl pyridine as the raw material, and chlorinating at 100-250 deg.C in the presence of inexpensive commercialized catalyst and chlorinating reagent to synthesize 2, 3-dichloro-5-trichloromethyl pyridine. The catalyst is commercialized, and is inexpensive. The method has such advantages as simple process, abundant and inexpensive raw material and catalyst, and high yield, and is suitable for mass production.

Provided is a method for evaluating of the chemical stability of a polychloroprene latex that permits evaluation of the chemical stability of polychloroprene at high accuracy.First, an aqueous calcium hydroxide or calcium nitrate solution at a concentration of 0.05 to 0.40 mass % is added to a polychloroprene latex having a solid matter concentration of 45 to 65 mass %. The generated precipitate is then collected by filtration and the dry mass is determined, and the precipitation rate (%) is calculated according to the following Formula (I).Precipitationrate(%)=A{B×(C / 100)}×100(I)(wherein, A represents the dry mass (g) of the precipitate; B represents the mass (g) of the polychloroprene latex, and C represents the solid matter concentration (mass %) of the polychloroprene latex.)

A centralizer for tubular elements is provided which includes an inner part formed by a first material having high mechanical performance and chemical stability and an outer part arranged on said inner part, formed by a second material. The second material may be an autolubricating material. The second material may further possess a low coefficient of friction. The second material may additionally possess lower mechanical performance and chemical stability than the first material.A method of manufacturing the centralizer is also provided, including steps of injecting the first material on a tubular element to form the inner part on the tubular element and injecting the second material to form the outer part on the formed inner part.

The invention relates to a dual-energy X-ray bone mineral density detection method based on a moving least square algorithm, which comprises the following steps: acquiring detection data of a motif under high-energy and low-energy X-rays of a photon counting detector, and carrying out preprocessing including denoising; the incident energy of the high-energy X-ray and the low-energy X-ray is obtained; calculating to obtain high and low energy attenuation values; performing grid division according to the thickness of the die body; after a weight function of a moving least square algorithm is determined, dividing an influence domain radius by taking a target node as a center in each grid, traversing each high-energy and low-energy attenuation value data point in a spatial domain, and setting a variable step length in the influence domain; obtaining a final fitting relationship by adopting a least square algorithm, and obtaining a die body thickness-high and low energy attenuation value fitting curved surface; a bone mineral density ROI area needing to be measured is determined, the corresponding motif thickness is obtained through calculation, and the product of the motif thickness and the motif density is the bone mineral density value of the corresponding part. According to the method, the problems of fitting smoothness and localization are solved.

This invention discloses a method for preparing trifluoromethyl pyridine. The method comprises: utilizing trichloromethyl pyridine as the raw material, and fluorinating at 100-250 deg.C in the presence of inexpensive commercialized catalyst and HF to synthesize trifluoromethyl pyridine. The catalyst is commercialized, and is inexpensive. The method has such advantages as simple process, abundant and inexpensive raw material and catalyst, and high yield, and is suitable for mass production.

This invention relates to a series of organic / inorganic hybrid polymers that are easy to fabricate into dimensionally stable films with good ion-conductivity over a wide range of temperatures for use in a variety of applications. The polymers are prepared by the reaction of amines, preferably diamines and mixtures thereof with monoamines with epoxy-functionalized alkoxysilanes. The products of the reaction are polymerized by hydrolysis of the alkoxysilane groups to produce an organic-containing silica network. Suitable functionality introduced into the amine and alkoxysilane groups produce solid polymeric membranes which conduct ions for use in fuel cells, high-performance solid state batteries, chemical sensors, electrochemical capacitors, electro-chromic windows or displays, analog memory devices and the like.

The invention relates to a silver plated fiber with an anti-discoloration layer and a manufacturing method thereof, and mainly provides the silver plated fiber with the anti-discoloration layer which can prevent discoloration and has anti-bacterial effect. The silver plated fiber comprises a fiber main body which is formed by fiber materials and comprises an outside surface, a plurality of silver atom agglomerations of which the silver atoms agglomerate in a local area of the outside surface, the anti-discoloration layer and a plurality of fine cracks, wherein the anti-discoloration layer which takes metals selected from titanium, gold, platinum, palladium and the like, and / or an alloy formed from the metals as materials forms a similar film pattern to attach on the outside surface and the agglomeration groups in a mode of film coating, and the fine cracks are formed on the anti-discoloration layer so that the anti-discoloration layer is discontinuous; and therefore the silver atom agglomerations are prevented from discoloring through the anti-discoloration layer and the fine cracks, which has no influence on the anti-bacterial effect of the silver.

The invention relates to a preparation method of amorphous cabazitaxel. The method comprises the steps of dissolving cabazitaxel in an organic solvent, putting in an appropriate vessel, volatilizing the solvent at normal pressure or pumping the solvent under reduced pressure, and drying to obtain the amorphous cabazitaxel. The cabazitaxel provided by the invention is good in appearance and stability and low in solvent residue; the preparation method is simple in operation and easy in industrialization.

The present invention relates to a granule capable of embedding physiological active substance, including an embedded substance. Its weight percentage is about 0.1-70%, and a base material whose weight percentage is about 30-99.9%, and said base material is one or several kinds selected from hydrogenated vegetable oil, hydrogenated animal oil and / or C8-64 saturated fatty acid and its derivative.Besides. It also provides the method for preparing granule and equipment for implementing method.

Novel 3-[2-(dimethylamino)methyl-(cyclohex-1-yl)]-phenol maleate compounds corresponding to formula I and processes for preparing these compounds are provided. Pharmaceutical compositions including these compounds and methods of treating or alleviating pain with these compounds are also provided.

The invention discloses an riptortus pedestris fabricius pheromone, and a preparation method and an application technology of an attractant lure of the riptortus pedestris fabricius pheromone. The riptortus pedestris fabricius pheromone comprises that trans-2-hexene-cis-3-hexenoic acid ester, trans-2-hexene-trans-2-hexenoic acid ester and myristyl isobutyrate are mixed according to the mass ratioof (0-10):(0-50):(0-10), so as to obtain a pheromone attractant. Trans-2-hexenoic acid, cis-3-hexenoic acid and isobutyryl chloride are respectively distilled and purified to obtain three pheromone components. The attractant is diluted with a solvent, and 10-100 [mu]l of the diluted attractant solution is added into a slow-release carrier to obtain the attractant lure of the riptortus pedestris fabricius pheromone. The lure and a corresponding matched trapper are used at the same time, and the riptortus pedestris fabricius is monitored, prevented and controlled in the field. The attractant provided by the invention can attract adult riptortus pedestris fabricius, has a remarkable trapping effect, and is of great significance to monitoring, prevention and control of riptortus pedestris fabricius.

At least partial substitution of zirconium by hafnium in ion-conducting zirconium-based ceramics provides enhanced chemical stability in alkaline and acid environments.

The invention relates to the technical field of environmental protection materials and preparation thereof, in particular to a preparation method of an alkali chelated palygorskite-based heavy metal passivation material. By modifying the heavy metal passivation material of palygorskite by alkali chelation, the passivation and adsorption performance of palygorskite have been greatly improved, which can passivate organic pollutants and toxic and harmful heavy metals, and reduce the biological effect of soil pollutants. Toxicity and mobility, reducing the bioavailability of heavy metals. Some of the heavy metals in the soil are in the form of cations. This part of the heavy metals has high mobility, high bioavailability, and the greatest harm. The application of quicklime can increase the pH value of the soil, and the negative charge on the surface of the soil particles increases, which promotes the formation of some heavy metals in the soil. The hydroxide precipitates and contributes to the stability of heavy metals, while enhancing the adsorption of palygorskite to heavy metals.

A composition comprising a peroxy salt, fumed silica, and a non-aqueous, water miscible material. These compositions exhibit improved storage stability relative to compositions lacking fumed silica. The peroxy salt is preferably sodium percarbonate. The preparation of the peroxy salt compositions, such as sodium percarbonate compositions described herein, includes non-aqueous liquids as well as solids. The compositions surprisingly, and unexpectedly, exhibit acceptable chemical stability at room temperature in sealed containers. The improved stability is thought to be due to the inclusion of fumed silica in the non-aqueous compositions described herein. The tendency of the composition to decompose in the container is notably reduced and even eliminated, compared to compositions lacking fumed silica.

The present invention relates to an electrochemical device capable of securing battery safety and improving battery performance by including a new separator having excellent thermal stability, excellent electrochemical stability, excellent lithium ion conductivity, and a preferred rate of electrolyte impregnation as compared with a polyolefin-based organic / inorganic composite porous separator according to the related art.