461 results about "Material chemistry" patented technology

The invention relates to a preparation method of a self-assembly material having surface-enhanced Raman activity, belonging to the technical field of material chemistry. The preparation method comprises the following steps: synthesizing gold nano particles; synthesizing gold nano rods; modifying DNA (deoxyribonucleic acid) 1 with the gold nano particles; modifying DNA 2 with the gold nano rods; coupling the gold nano rods with Raman beacon molecules; and assembling and characterizing the gold nano rods and the gold nano particles. The nano material assembly body prepared by the invention has a uniform and controllable assembly structure and has Raman activity, thereby making monomolecular detection possible.

In some embodiments, a composition comprises a bisphenol-A polycarbonate, wherein a molded article of the bisphenol-A polycarbonate has transmission level greater than or equal to 90.0% at 2.5 mm thickness as measured by ASTM D1003-00 and a yellow index (YI) less than or equal to 1.5 as measured by ASTM D1925. In some embodiments, light emitting device comprises: a lighting element located in a housing. The housing is formed from a plastic composition comprising: the polycarbonate composition and a conversion material. After the conversion material has been exposed to an excitation source, the conversion material has a luminescence lifetime of less than 10−4 seconds when the excitation source is removed.

The invention provides a preparation of a bisphenol A submicron magnetic molecular imprint and application of the same in the detection pre-processing of packaged food, which belong to the technical field of material chemistry and food safety. A surface molecular imprinting technology and a magnetic solid-phase extraction technology are combined, and a magnetic submicron particle wrapped by a surface molecular imprint polymer (Fe3O4@MIP) is prepared by using a bisphenol A as a template molecule. A magnetic submicron material (Fe3O4) is synthesized by a hydrothermal process, the synthesized Fe3O4 is synthesized into a silicon-wrapped magnetic microsphere (Fe3O4@SiO2) by a sol gel process, the synthesized Fe3O4@SiO2 is coupled with 2-bromo-isobutyryl bromide to form Fe3O4@SiO2@Br with Br groups on the surface, and the synthesized Fe3O4@SiO2@Br is synthesized into a submicron particle with a surface molecular imprint (Fe3O4@MIP) by an atom radical transfer process. The prepared Fe3O4@MIP is used in the detection pre-processing of packaged food which comprises liquid food, liquid food containing a certain quantity of solids and solid food.

The invention discloses a method for preparing size-controlled gold nanostars with surface Raman enhanced activity, belonging to the technical field of material chemistry. The method is characterized by comprising the steps of synthesizing nanomaterials with the surface Raman enhanced activity through a seed-mediated growth method, wherein the nanomaterials are gold nanostars; taking polyvinylpyrrolidone as seed liquid for stabilizer-coated gold nanoparticles; and reducing chloroauric acid adsorbed on the surface of the gold nanoparticles by using the reducing capacity of polyvinylpyrrolidone, so that the nanoparticles further grow in a crystal form direction, thereby obtaining gold nanostar particles with different forms; and meanwhile, gold nanostar materials with different surface enhanced Raman scattering (SERS) activities and different particle sizes can be obtained by changing the proportion of the reaction. According to the method, the gold nanostars with the uniform form and the relatively high yield can be prepared.

The invention relates to an electrochemical polishing method for the high purity aluminium under ultrasonic agitation, which belongs to the fields of the material chemistry and the electrochemistry. The electrochemical polishing method under the ultrasonic agitation comprises the following steps: high purity aluminium foil is added in absolute ethyl alcohol, so as to be cleaned with deionized water and through ultrasonic oscillations, and the natural oxide film in sodium hydroxide is removed; the aluminium foil after being pretreated is used as an anode, the platinum sheet is used as the cathode, the reference electrode is saturated calomel electrode, and the electropolishing solution is the mixed liquor composed of absolute ethyl alcohol and perchloric acid; the electrolysis vessel is positioned in an ultrasonic wave cleaner, and electrochemical polishing is performed on a constant potential rectifier. The self-organizing structure with nanoscale stripe shape is formed on the aluminium surface, the structure is observed by adopting the atomic force microscopy, and the size of the stripe-shaped nanostructure changes under the ultrasonic agitation; the composition of the polishing surface is analyzed through the Raman spectrum and the X-ray diffraction, so as to indicate that the composition of the polishing surface is amorphous aluminum oxide.

The invention relates to the field of material chemistry and provides a graphene / SiO2 composite material for solving various problems existing in the existing preparation method of a graphene material. The composite material is composed of two components graphene and SiO2. The composite material disclosed by the invention is good in dispersity; and meanwhile, specific surface area utilization rate of the graphene is improved. Meanwhile, the invention further discloses a preparation method and an application of the graphene / SiO2 composite material. A preparation process in the invention is simple and applied to reinforcement filler of organic silicon polymer.

The invention relates to a method for preparing a nano powder material, and belongs to the field of inorganic synthesis and material chemistry. In the method, a crystalline hydrate of nitrate is taken as a raw material, anhydrous C2 to C4 alcohols are taken as a solvent, ethanolamine is taken as a precipitator; and the nano powder material, such as zirconium oxide, cerium oxide and the like, is prepared by a coprecipitation method. The method overcomes the defects of nonuniform precipitation, easy aggregation, need of special drying method and equipment, and the like in the conventional coprecipitation method in which water is taken as the solvent, and an inorganic base or an inorganic salt is taken as the precipitator; and the prepared nano powder material, such as zirconium oxide and cerium oxide has the advantages of small grain size (the grain size is 6 to 20nm), small particle size, narrow particle size distribution range (the particle size distribution range is 50 to 150nm), no hard aggregation, high sintering activity and the like. The prepared nano powder material is suitable for the fields of a solid oxide fuel cell, a chemical sensor, a special functional ceramic, a catalyst or a catalyst carrier and the like.

The invention provides a fungaltoxin duplex detection method based on Raman beacon molecular coding silver @ gold core-shell nanometer particles, and belongs to the field of material chemical application. The invention has the main content of providing a simple and controllable preparation method of the Raman beacon molecular coding silver @ gold core-shell nanometer particles. A novel multiplex Raman sensing detector is built; the simultaneous fast specificity detection of two kinds or even various kinds of fungaltoxin is realized. The Raman beacon molecules are modified on the surfaces of silver nanometer particles; then, the growth of a layer of gold shell is performed; different Raman beacon molecular coding silver @ gold core-shell nanometer particles are prepared through regulating and controlling the pH of a buffer system and the types of the Raman beacon molecules; the Raman beacon molecule Raman signal intensity change and the generating mechanism under the electromagnetic field coupling effect between silver cores and gold shells are studied; the fungaltoxin aptamer specificity recognition principle and the good magnetic response of magnetic nanometer particles are combined; the multiplex Raman sensing detector is built; the simultaneous fast and specific detection of the aflatoxin and the ochratoxin on the basis of the Raman signals is realized for the first time.

The invention relates to electrolyte, belonging to the technical field of material chemistry and high energy batteries. The electrolyte consists of an organic solvent, an additive and lithium salt, wherein the organic solvent is one or a mixture of ethylene carbonate, ethyl methyl carbonate, methyl-carbonate or diethyl carbonate; the additive is sulfurous ester; and the lithium salt is selected from lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, perfluoroalkyl lithium sulfonate, perfluoroalkyl sulfoacid imide lithium, annular perfluoroalkyl di(sulfonyl)lithium imide, perfluoroalkyl acyl sulfonate lithium methide, organic boric acid ester lithium, organic lithium phosphate or organic aluminic acid ester lithium. Due to the adoption of the electrolyte, a layer of stable solid electrolyte phase boundary face film can be formed on the surface of a graphite electrode, the compatibility between the electrolyte and an electrode material is improved, the temperature suitability of the electrolyte material is expanded through proportion optimization, and the cycle performance, rate capability and temperature suitability of a lithium secondary battery using the electrolyte can be effectively improved.

This invention relates to olefin metathesis catalysts and methods for controlling olefin metathesis reactions. More particularly, the present invention relates to methods and compositions for catalyzing and controlling ring opening metathesis polymerization (ROMP) reactions and the manufacture of polymer articles via ROMP. This invention also relates to olefin metathesis catalyst compositions comprising at least two metal carbene olefin metathesis catalysts. This invention also relates to a ROMP composition comprising a resin composition comprising at least one cyclic olefin, and an olefin metathesis catalyst composition comprising at least two metal carbene olefin metathesis catalysts. This invention also relates to a method of making an article comprising combining an olefin metathesis catalyst composition comprising at least two metal carbene olefin metathesis catalysts with a resin composition comprising at least one cyclic olefin, thereby forming a ROMP composition, and subjecting the ROMP composition to conditions effective to polymerize the ROMP composition. Polymer products produced via the metathesis reactions of the invention may be utilized for a wide range of materials and composite applications. The invention has utility in the fields of catalysis, organic synthesis, and polymer and materials chemistry and manufacture.

The invention discloses a preparation method for a metal complex functionalized ZIF-8 (zinc 2-methylimidazolate) material, which belongs to the scopes of physical chemistry and material chemistry. The preparation method is characterized by comprising the following steps of directly introducing the needed metal ions during synthesis for a zeolite-like imidazole framework material ZIF-8, then matching the metal ions supported by the zeolite-like imidazole framework material containing the needed metal ions with a selected ligand in certain conditions, so as to immobilize the metal complex in the zeolite-like imidazole framework material ZIF-8. According to the preparation method, a multi-phase supported catalyst can be prepared by virtue of the unique subject effect of ZIF-8, and a new way can be provided for functionalization for the ZIF-8 material and preparation for a novel functional material.

This invention relates to compositions and methods for improving the adhesion of resin compositions to substrate materials, pre-treating substrate materials to improve the adhesion of resin compositions to the substrate materials, and / or controlling gel formation of resin compositions. More particularly, the invention relates to compositions and methods for improving the adhesion of ring opening metathesis polymerization (ROMP) compositions to substrate materials using adhesion promoters containing isocyariate groups in a resin composition. The invention also relates to methods for improving the adhesion of resin compositions to substrate materials by pre-treating substrate materials with adhesion promoters containing isocyanate groups. The invention further relates to a method of providing a gel-modified ROMP composition, in which a hydroperoxide is added to a ROMP polymerizable resin composition in order to control gel formation of the polymerizing resin. An improved ROMP composition is further disclosed, comprising a cyclic olefin, a ROMP metathesis catalyst, an adhesion promoter, and an added hydroperoxide gel modifier. The polymer products produced via ROMP reactions of the invention may be utilized for a wide range of materials and composite applications. The invention has utility in the fields of catalysis, organic synthesis, and polymer and materials chemistry and manufacture.

The invention relates to a carbon-nitrogen porous material and a hydrogen storage application thereof, which belong to the field of inorganic nano material chemistry and new energy resources-related technology. An ordered meso-porous carbon-nitrogen compound is prepared by a meso-porous silicon dioxide hard template method, wherein, ethylene diamine is taken as a precursor and carbon tetrachloride is taken as a solution; the ethylene diamine and the carbon tetrachloride are mixed and stirred evenly for reflux and immersion; the sample obtained is carbonized at high temperature and detemplated to obtain an ordered meso-porous carbon-nitrogen material; the ordered meso-porous carbon-nitrogen material is treated and activated by carbon dioxide at high temperature, wherein, air flow, activation temperature and activation time are controlled; and then a nitrogen-doped porous carbon material with special appearance and pore structure is obtained. The material can be taken as a high-performance hydrogen storage medium at room temperature, and can absorb 2.21wt% hydrogen in a reversible manner under the condition of room temperature and 80Mpa. Compared with the conventional hydrogen alloy, the carbon material has the advantages of low cost, good cycle performance and higher hydrogen storage capacity.

The invention discloses a preparation method for a cobalt-doped zinc oxide gas-sensitive material and application thereof, which relate to the technical fields of material chemistry and gas-sensitivesensors. Polyvinylpyrrolidone (PVP), zinc acetate and cobalt nitrate hexahydrate are dissolved in 75ml of ethylene glycol, wherein polyvinylpyrrolidone, the molecular weight of which is 400,000, is 0.3g, the molar ratio of cobalt nitrate hexahydrate to zinc acetate is between 0.025 and 0.233, and thereby the cobalt-doped nanoscale spherical zinc oxide gas-sensitive material is prepared. Because amicrowave-and-ultrasonic wave-co-assisted solvothermal method is adopted in the process of preparation, the cobalt-doped nanoscale spherical zinc oxide material has high detection sensitivity and goodselectivity; and the preparation method is simple and harmless to the environment, and effectively overcomes defects existing in the prior art, for example, preparation methods are complex and cost is higher and production process conditions are strict, and sensors have high working temperature, low response and recovery speed and short service lives.

The invention belongs to the technical field of material chemistry and particularly relates to a preparation method for gold-silver alloy nanometer particles. The preparation method comprises the steps as follows: mixing a silver nitrate solution with a chloroauric acid solution, stirring and heating; adding a sodium phytate solution and continuing to stir and heat; adding a trisodium citrate solution for reaction to prepare a gold-silver alloy nanometer sol; and cooling and refrigerating for storage. The molar ratio of the silver nitrate to the chloroauric acid to the sodium phytate is 1 to 0.25-3.5 to 1-4, and the silver nitrate, the chloroauric acid and the sodium phytate are stirred and heated to be 80-90 DEG C. The volume of the trisodium citrate is 0.8-2.6% of that of the silver nitrate solution. The preparation process is simple, convenient and short in time consumption; the sodium phytate is added in the preparation process, so that the effect of a bridging agent is achieved, the quantity of active sites between the nanometer particles are increased, and the stronger Raman enhancement effect is obtained; and the detection accuracy and sensitivity of the gold-silver alloy nanometer particles are high, the commonality is strong, and various analyte molecules can be subjected to Raman detection.

The present invention belongs to the field of organic polymer chemistry and material chemistry, and is especially V-shaped conjugated light-absorbing organic salt compound and its use. The V-shaped conjugated light-absorbing organic salt compound is prepared with corresponding organic salt and heterocyclic dialdehyde, and through condensation or reaction with halogenated compound in V-shaped conjugation system. It has the structure as shown. The V-shaped conjugated light-absorbing organic salt compound may be as photsensitizer and / or initiator for single or double photon polymerization, as single or double photon bioluminescence probe with microM level use concentration, and as second order non-linear optical material; and its crystal may be used as electro-optical material and tera Hz beat frequency generator.

In one embodiment, a light emitting device comprises: a lighting element located in a housing, wherein the housing is formed from a polymer composition comprising: a polymer material; and a coated conversion material. The coated conversion material is selected from a coated conversion material, coated yttrium aluminum garnet (YAG) doped with rare earth elements, coated terbium aluminum garnet doped with rare earth elements, coated silicate (BOSE) doped with rare earth elements; coated nitrido silicates doped with rare earth elements; coated nitride orthosilicate doped with rare earth elements, coated oxonitridoaluminosilicates doped with rare earth elements; as well as combinations comprising at least one of the foregoing. After the coated conversion material has been exposed to an excitation source, the coated conversion material has a luminescence lifetime of less than 10−4 seconds when the excitation source is removed.

The invention belongs to the technical field of material chemistry, in particular to a lithium sulfur battery cathode material and a lithium sulfur battery thereof. A lithium sulfide battery cathode material is prepared by that following preparation method: using N, N-Dimethylformamide as solvent, dissolving polyacrylonitrile and silica in N, N-Dimethylformamide Solution to prepare the spinning precursor liquid; preparing a silica-polyacrylonitrile membrane by using the electrospinning; carbonizing the silica-polyacrylonitrile membrane to obtain carbon fiber-silica composites, then soaking thecarbon fiber-silica composite in hydrofluoric acid to form the porous carbon fiber material, and doping the porous carbon fiber material with sulfur to prepare nitrogen doped porous carbon-sulfur cathode material in situ. The cathode material of the lithium sulfide battery has a porous structure, provides a large number of ion channels and a high specific surface area, effectively improves the shuttle effect of polysulfides in the lithium sulfide battery, and improves the cycle life of the lithium sulfide battery and the utilization rate of active substances in the cathode material.

In some embodiments, a composition includes: a conversion material and a bisphenol-A polycarbonate; wherein a molded article of the bisphenol-A polycarbonate has a transmission level of greater than or equal to 90.0% at a thickness of 2.5 mm as measured by ASTM D1003-00; and wherein the molded article comprises an increase in the yellow index of less than 2 during 2,000 hours of heat aging at 130° C.; and wherein the conversion material comprises a yellow conversion material, a green conversion material, a red conversion material, or a combination comprising at least one of the foregoing.

The invention belongs to the technical field of microscopic spectral imaging, and relates to a laser double-shaft differential confocal Brillouin-Raman spectrum measurement method and device. The laser double-shaft differential Brillouin-Raman spectrum measurement method and device fuse double-shaft differential confocal microscopy and spectrum detection technologies, and use a segmentation focal spot differential detection method to realize precise imaging of geometric position, and Raman spectrum detection and Brillouin spectrum detection technologies are combined to realize united detection on a system high spatial resolution graph spectrum. The laser double-shaft differential Brillouin-Raman spectrum measurement method and device have three modes of three-dimensional tomographic geometric imaging, spectrum detection and micro-region spectrum tomographic imaging, and use the characteristics of complementary advantages of a confocal Raman spectrum detection technology and a confocal Brillouin spectrum detection technology to provide a new solution channel for comprehensive detection of morphology, properties, texture, stress and other parameters of a sample, and have wide application prospect in the fields of biomedicine, high energy production, material chemistry and the like.

The invention belongs to the technical field of material chemistry, and discloses a Fe / C composite material. The Fe / C composite material is prepared by adopting a carbon-thermal reduction method through the following steps: 1) dissolving and preparing ferric salt into an iron-containing solution, adding a carbon source into the iron-containing solution, oscillating and shaking well, controlling the pH value of the iron-containing solution to be about 8.0, stirring and heating until gel is generated, then transferring into a vacuum drying oven for drying moisture; and 2) putting a product obtained from the step I into a tubular resistance furnace with nitrogen protection, carbonizing for 4 h under the condition of 500-1000 DEG C, cooling and grinding and then cleaning with deionized water, removing water-soluble components, then filtering and drying, milling into powder, thereby obtaining a zero-valent Fe / C-loading composition material. The invention further provides applications of the Fe / C composite material for fixing uranium in waste water as an adsorbent. According to the invention, the technical problem that agglomeration is easily generated when zero-valent iron is synthesized by adopting a traditional NaBH4 liquid phase reduction method. The Fe / C composite material has a high-efficiency immobilization effect on uranyl ions in the waste water, and can be used for treating the mining uranium-containing waste water pollution.

The invention provides a surface-enhanced Raman detection method for mycotoxin based on a silica-coated gold nanotriangle. According to the method, a three-step seed induction method is employed for preparation of a gold nanotriangle, and the gold nanotriangle is labeled with a 5,5'-dithiobis(2-nitrobenzoic acid) (DTNB) signal molecule and coated with silica so as to prepare a gold@DTNB@silica surface Raman enhancing agent; a chitosan ferriferrous oxide (CS-Fe3O4) magnetic material is prepared at the same time; an enhanced substrate and the magnetic material are modified with mycotoxin aptamer so as to construct a mycotoxin detection system; when mycotoxin exists, gold@DTNB@silica and CS-Fe3O4 are bonded together via the effect of the specific recognition of the aptamer so as to form a CS-Fe3O4-aptamer-mycotoxin-gold@DTNB@silica detection system; with changes of the concentration of mycotoxin, the Raman signal of the system is not changed after magnetic separation; and thus, quantitative ultra-sensitive detection of mycotoxin in food is realized. The method is applicable to the technical fields of food safety, material chemistry and the like.

The invention relates to a preparation method of a metal complex functionalized hydrotalcite-like nano-layer sheet, which belongs to the field of physical chemistry and material chemistry. The preparation method comprises the following steps of: utilizing metal complex functionalized silane to be directly reacted with surface hydroxyl on a hydrotalcite-like nano-layer sheet after stripping a layer so as to graft a metal complex on the hydrotalcite-like nano-layer sheet, and simultaneously utilizing the reaction of the silane and the surface hydroxyl and the electronic and three-dimensional effects of the grafted metal complex to weaken the electrostatic interaction between the stripped layer and the nano-layer sheet, thereby improving the stability of the hydrotalcite-like nano-layer sheet, preventing the hydrotalcite-like nano-layer sheet from being compounded after a solvent is removed, and still keeping the state of the nano-layer sheet. An organic-inorganic composite material prepared by adopting the method has the characteristics of large specific surface area and high content of the metal complex, and simultaneously has the multifunctional catalytic performances of hydrotalcite-like and the metal complex.

The invention discloses a hierarchical-pore nitrogen-doped carbon material and a preparation method thereof and belongs to the field of material chemistry. The hierarchical-pore nitrogen-doped carbon material is prepared from components of raw materials as follows: a metal-organic framework material, a structure-directing agent, phenol, aldehyde, urea and an alkaline catalyst in the mass ratio being 1:(1-30):(0.5-20):(0.5-20):(0.1-10):(0.5-2). The mesoporous shell structure of the hierarchical-pore nitrogen-doped carbon material facilitates rapid dispersion of gas in pore passages, inside microporous cores facilitate gas adsorption, and meanwhile, the adsorption strength of pore passage surfaces and gas molecules is further improved as well through doping of nitrogen atoms in mesoporous shells and the microporous cores. Under the joint action of the mesoporous shell structure, the microporous cores and nitrogen atom doping, the provided hierarchical-pore nitrogen-doped carbon material has enhanced gas adsorption performance as compared with existing single-core and single-shell carbon materials.

In some variations, a method of real-time monitoring of battery capacity comprises correlating electrode open-circuit voltage with electrode state of charge for a selected electrode; compiling a look-up table to correlate the electrode open-circuit voltage with the electrode capacity at different values of the active-material capacity; during real-time operation, identifying first and second times at which battery terminal voltages are approximated as battery open-circuit voltages; and calculating battery capacity based on the difference in battery open-circuit voltages at the first and second times, current integration, and the look-up table. No reference electrode is needed, and a complete battery charge / discharge is not necessary to determine the capacity. This technique can therefore be implemented on-board and in real time to provide reliable capacity estimation even as the battery ages. The methods are applicable to various metal-ion secondary battery systems, including lithium-ion batteries, with different material chemistries.

The invention discloses a gold nanorod dimer asymmetric modification method with biocompatibility, and belongs to the technical field of material chemistry. The method comprises the following steps: synthesizing gold nanorods; assembling gold nanorod dimer; modifying the surface of the gold nanorod dimer with ligands; asymmetrically modifying the gold nanorod dimer; representing the gold nanorod dimer in cells and the like. By fully utilizing the surface properties of the gold nanorods, the ligands of different hydrophilic and hydrophobic properties are modified on the surfaces of the gold nanorods assembled into the dimer through different chemical properties of end faces and side faces of the gold nanorods, then polymer only modifies on the side faces according to different hydrophilic and hydrophobic properties of the ligands, and the exposed end faces can be used for modifying cell-penetrating peptide. Thus, the stability of the gold nanorods in the cells can be guaranteed, and the efficiency of the gold nanorods for entering the cells can also be greatly increased. According to the gold nanorod dimer asymmetric modification method with biocompatibility, the gold nanorod dimer with a uniform structure and good biocompatibility is obtained.

The invention belongs to the field of material chemistry and relates to a preparation method of a positive electrode material for a lithium-sulfur battery. According to the method, a composite material of which the effective loading amount of sulfur is significantly increased and the "shuttle effect" of polysulfides is reduced is obtained through three steps of preparing a graphene oxide aqueous solution, preparing a foamed graphene / carbon nanotube composite material and preparing a sulfur / foamed graphene / carbon nanotube composite positive electrode material. The material is used as a positiveelectrode material for a lithium battery, so that volume expansion of the lithium-sulfur battery can be effectively reduced, the electrochemical stability of the battery is improved, the first discharge capacity can reach 1529mAh / g and the discharge capacity is still 859mAh / g after 200 charge-discharge cycles.

The invention belongs to the crossing field of inorganic synthesis chemistry and material chemistry and relates to a method for synthesizing a thin layer ZSM-5 zeolite with a boron-containing framework. The method includes that a silicon source, a boron source, an aluminum source and a biquaternary ammonium salt template agent are mixed with deionized water to synthesize the thin layer ZSM-5 zeolite with a framework simultaneously containing boron and aluminum in one step through a hydrothermal process. The synthesized zeolite has the advantages that the thin layer sheet shaped appearance is achieved, the degree of crystallinity is high, the synthesized zeolite is in a typical MFI structure, a large outer surface area is achieved, a surface acidity site is fully exposed, and acid strength and strong acid site proportion on the surface of the zeolite can be effectively controlled by adjusting a ratio of boron and aluminum in a fed material. The thin layer ZSM-5 zeolite with the boron-containing framework has an excellent application potential in an acid catalyzed reaction and particularly in a macromolecule splitting and polysaccharide hydrolysis reaction.

The invention belongs to the technical field of material chemistry, and relates to a method for preparing an Ag2X film, wherein X refers to selenium or tellurium. The method provided by the invention comprises the following steps: firstly, adding silver nitrates and a compound of selenium or tellurium into a beaker filled with a solvent, then adding alkali and a complexing agent into the beaker, and fully stirring so as to completely dissolve the added objects, then adding a reducing agent into the beaker, after the reducing agent is completely dissolved, stopping stirring, and adding a substrate into the beaker for depositing the Ag2X film; then, after the thermostatic reaction is completed, washing the obtained Ag2X film with deionized water and absolute ethyl alcohol; and finally, drying the Ag2X film. The method provided by the invention has the advantages that the reaction condition is mild, an Ag2Se or Ag2Te film can be synthesized at one step in an aqueous solution, and the prepared film is smooth, compact and uniform; the used raw materials are cheap and easy to obtain, the process is simple, the large-scale production is easy to realize, and because of avoiding using a large quantity of organic solvents in the process of reaction, the method is in favor of environmental protection, and has a broad market prospect; and the synthesized silver selenide and silver telluride film can be widely applied to multiple fields of fast ionic conductors, nonlinear optical elements, photoelectric secondary batteries, and the like, therefore, the film has a broad market prospect.

The present invention is directed to three dimensional weaves composed of wires or yarns that offer the potential for damping not achievable with solid materials, including high temperature damping. Three damping mechanisms have been identified: (1) Internal material damping, (2) Frictional energy dissipation (Coulomb damping), and (3) inertial damping (tuned mass damping). These three damping mechanisms can be optimized by modifying the wire material chemistries (metals, ceramics, polymers, etc.), wire sizes, wire shapes, wire coatings, wire bonding, and wire architecture (by removing certain wires). These have the effect of modifying the lattice and wire stiffnesses, masses, coefficients of friction, and internal material damping. Different materials can be used at different locations in the woven lattice. These design variables can also be modified to tailor mechanical stiffness and strength of the lattice, in addition to damping.