159 results about "Nanotechnology Techniques" patented technology

Size-confined nanocomposite powders and methods for their manufacture are provided by coating fine powders with a nanoscale powder of a different composition. The nanocomposite plastics disclosed offer performance characteristics approaching those of metals and alloys. The nanocomposite powders are alternatively used for dispersion strengthening of metals, alloys, and ceramics. Novel materials based nanotechnology for energy devices and programmable drug delivery are disclosed.

The invention provides a preparation method for a super-hydrophobic material. The method comprises the following steps: (1) modifying the integral three-dimensional structure of a substrate material by using a nanomaterial with a nanotechnology, so that the roughness of the integral three-dimensional structure of the material is increased; (2) coating the material with a low-surface-energy substance through a surface modifying technology to obtain the super-hydrophobic material. The static contact angle between the super-hydrophobic material and water is 152-158 degrees. The prepared super-hydrophobic material has superior hydrophobicity, the preparation process is simple, the reaction conditions are mild, and special machining equipment is not needed.

The invention provides a method for preparing spherical nano-silver particles and belongs to the field of nanotechnology. The method comprises the following steps: (1) mixing sodium salt, macromolecular protective agent and polyhydric alcohol uniformly to obtain a mixed solution A; (2) mixing silver nitrate and polyhydric alcohol uniformly to obtain a mixed solution B; (3) dropwise adding the mixed solution A into the mixed solution B, and mixing the solutions A and B uniformly to obtain a colloidal solution; (4) heating and reacting the colloidal solution obtained in step (3) for 1-5 min under the radiation of microwave of 300-550 W, and cooling the reaction product to the room temperature to obtain the spherical nano-silver particles, wherein the macromolecular protective agent is polyvinylpyrrolidone or citric acid. The spherical nano-silver particles prepared by the method have the advantages of uniform particle size, dispersibility, short reaction time, high production efficiency and high yield.

A surface acoustic wave based CO₂ sensor using carbon nanotubes as the sensitive layer fabricated by combining surface acoustic wave (SAW) devices and nanotechnology. The device structure consists of the gas sensitive material between the input and output interdigital transducers (IDTs) of a SAW device. The CO₂ gas gets adsorbed on nanotubes when the carbon nanotube based SAW sensor is exposed to CO₂ at room temperature and/or at elevated temperature, which in turn changes conductivity of the carbon nanotube. This conductivity change will affect the velocity of the SAW traveling across the nanotubes and will give a frequency change which corresponds to the percentage of the CO₂ molecules adsorbed by the nanotubes.

An apparatus and method for measuring optically the position or angle of a variety of objects or arrays of objects, including cantilevers in scanning probe microscopy, micromechanical biological and chemical sensors and the sample or a probe in surface profilometry. The invention involves the use of one or more diffractive optical elements, including diffraction gratings and holograms, combined with conventional optical elements, to form a plurality of light beams, each with a selectable shape and intensity, from a single light source, reflect the beams off mechanical objects and process the reflected beams, all to the end of measuring the position of such objects with a high degree of precision. The invention may also be used to effect mechanical changes in such objects. Devices with these improvements have numerous applications, including molecular force measurements, atomic force microscopy and manipulation technology, lithographic manufacturing, nanometer scale surface profiling and other aspects of nanotechnology.

The invention belongs to the field of nano technology and particularly relates to a method for preparing nano silver conductive ink. The method comprises the following steps: dissolving a silver salt and an organic protective agent in a solvent, adjusting the pH value of the solution to 9 to 10 with an alkaline complexing agent, and raising the temperature gradually to 30 to 100 DEG C till the reaction system is a transparent solution; and cooling the reaction system obtained by the previous step to room temperature, adding a reducer into the reaction system, and continuously stirring the reaction system for 20 to 30 minutes to obtain the nano silver conductive ink. The molar ratio of the organic protective agent to the silver salt is 0.01-3:1; each 0.01 mol of silver salt is dissolved in 5 to 50 milliliters of solvent; and the molar ratio of the reducer to the silver salt is 1-3:1. The nano silver prepared by the method has the advantages that: the particle size is less than 10 nanometers; the process is simple, the reaction conditions are mild and the reaction time is short; the raw materials are simple and the dose of the dispersant is small; the purity and concentration are high; and the conductive property is good. In addition, the preparation cost of the nano silver ink is low; no harmful waste is produced, so the requirements for 'green production' are met; and the nano silver ink can be widely used in fields of touch screens, electronic tags, thin film switches, flexible circuit boards, medical products, sensors, printing contact, radio frequency interference screening, electrolysis, multilayer circuit board hole filling and the like.

The invention relates to a laser ablation method for coating an object with one or more surfaces, so that the object to be coated, i.e. the substrate, is coated by ablating the target, so that the uniformity of the surface deposited on the object to be coated is ±100 nm. The surface of the coated object is advantageously free of micron size particles, and it is typically a nano technological surface where the size of separate particles is ±25 nm at most. The object also relates to products made by said method.

The invention belongs to the field of medicine and high-polymer materials, and discloses a method for preparing small-diameter artificial blood vessels on the basis of nanotechnologies. The method includes steps of dissolving, by weight, 8% of fibroin and 5% of polycaprolactone in hexafluoroisopropanol to obtain spinning liquor; manufacturing the nano-fiber blood vessels with the wall thicknesses of 130-170 micrometers on cylindrical rod-shaped receiving screens with the diameters of 1-1.2mm by means of electrospinning by the aid of electrospinning technologies. Compared with the prior art, the method has the advantages that requirements of tissue engineering on high tissue compatibility, high porosity, plasticity and degradability can be met owing to the electrospinning technologies, vascular stents can be modified by cell activity factors (mechanical growth factors) and medicine (heparin) with anticoagulant activity, and accordingly shortcomings of technological complexity and poor tissue compatibility of existing cell-modified vascular stents can be overcome by the aid of the method.

The invention belongs to the technical field of nanometer, and discloses preparation of polymer carbon dots and a detection method thereof applied to nitrite ion colorimetry fluorescence. When different concentrations of nitrite ions exist in a buffer system containing a certain amount of polymer carbo dots, for an absorption spectrum, the absorption peak in a 610nm position is obviously reduced;the absorption peak in a 380 nm position is gradually increased; the intensity of the fluorescence emission peak in a 625 nm position of the fluorescence spectrum is gradually reduced along with the increasing of the nitrite ion; Therefore according to the change of polymer carbon dot fluorescence spectrum and absorption spectrum in a system, through fluorescence colorimetry multi-output signal analysis, the high-sensitivity and high-selectivity detection on the nitrite ions can be realized; the detection on the nitrite ions in a complicated system such as urine can be further realized. A polymer carbon dot-based fluorescent colorimetric probe is a novel expansion on the original analysis method, and is hopeful to be used for the analysis and detection of nitrite ions in the complicated systems such as food, environment and the like.

A customizable high-gain ZnO nanowire array UV detector and a preparation method thereof relate to the fields of microelectronic technologies, nanometer technologies and UV detection. On the basis of a synergic theory, nanowires compete for a reaction solute when fluctuation is instable, an in such a competition mechanism, the thinner a seed layer is, the fewer solute resources are needed, and growth time is decided by the growth speed. Based on such a growing principle, the thickness of the seed layer, the solution concentration and growth time are adjusted to obtain nanowires of higher quality, and UV detection devices of different gains are obtained. The method is simple and effective, and the customized devices of different gains can be suitable for UV detection in different environments.

The invention provides an automatic-assembling method for preparing a molecular imprint polyaniline nanocomposite, and relates to the technical field of high molecular material science. The preparation method comprises the followings steps: firstly, synthesizing a random amphiphilic copolymer through free radical polymerization; preparing micelle of polymer by adopting an automatic-assembling method; synthesizing the molecular imprint polyaniline nanocomposite through in-situ polymerization by taking a safety hazard factor in food as a template molecule, wherein the molecular imprint polyaniline nanocomposite is applied to food as an absorbent for the safety hazard factor. According to the invention, electric conductive polyaniline, the nano technique and the molecular imprint technique are combined, and the preparation method is simple, is controllable in condition, and is low in cost; the prepared molecular imprint polyaniline nanocomposite has the advantages of specific recognition capability on the template molecule, high selectivity, high adsorption speed, capability of being used repeatedly, environment friendliness and the like.

The invention belongs to the field of nanotechnology, and in particular to a synthesis method for a dopamine-modified magnetic mesoporous silica material and applications thereof. The synthesis method comprises: first, dispersing a magnetic mesoporous silica material in a dopamine solution uniformly; adding a sodium monohydrogen phosphate - disodium hydrogen phosphate buffer solution with a concentration of 0.2M, adding glutaraldehyde, and shaking the obtained solution for reaction at a room temperature for 0.5-1 hours; washing completely; dispersing the obtained product in above step in a sodium monohydrogen phosphate - disodium hydrogen phosphate buffer solution with a concentration of 0.2M, and shaking the obtained solution for reaction at the room temperature for 2-4 hours; washing completely; dispersing the obtained product in above step in a 2mg/mL trypsin-containing ammonium bicarbonate buffer solution with a concentration of 25mM, and shaking for reaction at the room temperature for 2 hours; and washing completely to remove surface impurities the product to give the desired material. According to the material, magnetic microspheres are employed as skeletons to provide magnetism to benefit subsequent separation and analysis, the pore size distribution and biocompatibility are good, the synthesis method is simple and low in cost, and size-exclusion selective enzymolysis can be performed by fixing enzyme inside the pore.

The invention belongs to the field of nanometer technologies and particularly relates to a method for efficiently catalyzing a TMB (Tetramethylbenzidine) color development reaction by using carbon nanoparticles. The method comprises the steps of: adding 250 mu M of TMB solution and 0.25-500 mu M of H2O2 into 400 mu L of water, then adding 5-40 mu L of surfactant-modified carbon nanoparticles, shaking to reach a uniform state, and measuring time-varying absorption values under the wavelength of 652nm, wherein the surfactant is anyone of SDS (Sodium Dodecyl Sulfate), DNA (Deoxyribose Nucleic Acid), DTAB (Dodecyl Trimethyl Ammonium Bromide) and Tuwen20, and the dimension of the carbon nanoparticles is 20-70nm. By utilization of the carbon nanoparticles as a catalyst, the favorable characteristics of cheap materials, short color development time, high catalysis efficiency and the like are achieved, and the catalytic effect of the carbon nanoparticles is far better than that of graphene and single-walled carbon nanotubes.

The invention relates to a method for preparing nanometer structures from top to bottom on the surfaces of (110) type silicon chips, which belongs to the technical field of nanometer and is characterized in that the anisotropy wet process corrosion characteristics of silicon materials are used for preparing monocrystalline silicon nanometer wall structures or nanometer corner structures with the characteristic dimension being nanometer level on the surfaces of the (110) silicon chips, or a self limitation oxidation process is combined for further preparing the monocrystalline silicon nanometer line structure with the cross section in a reverse triangular shape. The method has the advantages that the process is simple, only the conventional photoetching and the anisotropy wet process corrosion masking manufacture, corrosion and etching processes are adopted, the large-scale manufacture can be realized, and the method belongs to a convenient micro nanometer integrating process technology. The nanometer structure manufactured in the invention can be used for studying the structure properties of the low-dimension monocrystalline silicon materials, including the study of the mechanical property, the thermal property, the electric property and the like, can also be used as sensor function structure components and has the application prospects.

A particle with two regions, the first region contains a detoxifying enzyme and a second region that partitions toxic compounds. The particle may be a nanoparticle.

The invention relates to a method for preparing a nano structure on a surface of a (111) silicon wafer, belonging to the technical field of nano. The invention is characterized in that a monocrystalline silicon nano wall structure or nano horn structure of which the characteristic dimension is on a nano level is prepared on the surface of a (111) silicon wafer by utilizing the anisotropic wet-process corrosive characteristic of the silicon material, or a self-restricting oxidation technique is combined to further prepare a monocrystalline silicon nanowire structure of which the cross section is in an inverted triangle shape. The invention has the advantage of simple technique, only relates to conventional photoetching, anisotropic wet-process etching mask manufacturing, corroding and etching techniques, can implement large-scale manufacture, and is a convenient micro/nano integration technology. The nano structure manufactured by the method provided by the invention can be used for researching properties (including mechanical, thermal, electric and other properties) of a low-dimension monocrystalline silicon material structure, can be used as a functional structure component of a sensor, and has application prospects.

The invention relates to a nanometer sensing method for separately or simultaneously detecting iron ions and copper ions, and applications. The nanometer sensing method comprises the following steps of: adding Fe<3+> or Cu<2+> into a gold nanocluster water solution, TMB solution and hydrogen peroxide solution system, and fully reacting so as to realize the separate detection of two ions through the color change and the ultraviolet absorbency degree value change; respectively masking Fe<3+> and Cu<2+> through chelating agents NH4F and EDTA, and fully reacting so as to realize the simultaneous detection of two ions through the color change and the ultraviolet absorbency degree value change. The gold nanoclusters having excellent optical properties, high fluorescent intensity, high stability and good catalytic activity are adopted, nanomaterials widely applied into the ion detection, bioimaging, genetic markers, biosensing, medicines and catalysis fields, and the nanometer technology is applied to the field of ion detection.

Techniques for combining nanotechnology with photovoltaics are provided. In one aspect, a method of forming a photovoltaic device is provided comprising the following steps. A plurality of nanowires are formed on a substrate, wherein the plurality of nanowires attached to the substrate comprises a nanowire forest. In the presence of a first doping agent and a first volatile precursor, a first doped semiconductor layer is conformally deposited over the nanowire forest. In the presence of a second doping agent and a second volatile precursor, a second doped semiconductor layer is conformally deposited over the first doped layer. The first doping agent comprises one of an n-type doping agent and a p-type doping agent and the second doping agent comprises a different one of the n-type doping agent and the p-type doping agent from the first doping agent. A transparent electrode layer is deposited over the second doped semiconductor layer.

The present disclosure provides forming nanostructures with precision dimension control and minimum lithographic related errors for features with dimension under 14 nanometers and beyond. A self-aligned multiple spacer patterning (SAMSP) process is provided herein and the process utilizes minimum lithographic exposure process, but rather multiple deposition/etching process to incrementally reduce feature sizes formed in the mask along the manufacturing process, until a desired extreme small dimension nanostructures are formed in a mask layer.

The invention relates to a nanometer vanadium oxide and the preparing method thereof, which belongs to the fields of nanometer material and nanometer technology.Under the effects of different templates, through hydrothermal synthesis or renewed arrangement process of fine articles , different vanadium sources generate nanometer vanadium oxides with the shapes of rod-like and irregular flakes or regular round flakes.The length of nanometer rod is 1 to 5Mum and the diameter is 20 to 150nm.The length of the vanadium oxide with the shape of round flake is 0.5-2 Mum and the thickness is 20 to 150nm.The preparing method is characterized by the low material cost, simple process, as well as controllable shape and appearance of the nanometer material, etc., and the same time has important exploitation value and application prospect.

The invention belongs to the field of advanced nanomaterials and nanotechnology, and specifically provides a preparing method for modifying a titanium dioxide nanofilm on a target and application thereof. The method applies an atomic layer deposition technology, a layer of titanium dioxide nanofilm is modified on a stainless steel MALDI target plate, and the layer of film and the target plate are combined very firmly. Afterwards, the modified target plate is applied to purification and MALDI analysis of phosphorylated peptides on a target. The target plate in the invention displays excellent purification performance, has well repeatability and has broad application prospect in the field of purification of the phosphorylated peptides.

The invention discloses a double-quantum-dot nano complex nitrogen monoxide ratiometric fluorescent probe and a preparation method thereof, belonging to the fields of nano technology and chemical analysis. The preparation method of the probe comprises the following steps: (1) carrying out reaction on mercaptopropionic-acid-stable CdSe quantum dots and a silane agent to obtain an amino-surface-functionalized CdSe@SiO2 core-shell complex; (2) dropwisely adding the mercaptopropionic-acid-stable CdSe quantum dot dispersion solution into the core-shell complex system to prepare a CdSe@SiO2-CdTe nano complex; and (3) introducing NO into the nano complex system, determining the fluorescence emission spectrum of the system, fitting the linear relationship between the CdTe/CdSe quantum dot ratiometric fluorescence intensity and NO concentration, and establishing the NO ratiometric fluorescent probe based on the CdSe@SiO2-CdTe nano complex. Compared with the prior art, the ratiometric fluorescence intensity introduced into the fluorescent probe can obviously enhance the NO detection accuracy and feasibility, and has important application value.

The invention relates to a metallic nano material toxicity detection board and a detection method thereof in the nano technical field. The toxicity detection board comprises a base, a board cover and a detection cell, and is characterized in that the base is a rectangular container; a plurality of vertical positioning columns are arranged on the inside bottom of the base so that the edges of the detection cell can be located on the base; and clasping edges are arranged at the periphery of the board cover to clasp the edges of the base. The method of the invention takes the possible degradation and metabolic components inside modification molecules into full consideration, and determines the cytotoxicity grade of metallic nano particles through a double step detection method, so that the selection of proper metallic nano particles and the modification molecules in future can be standardized and unified, and easy to repeat and compare.

The invention belongs to the technical field of nanometer, and in particular relates to a method for preparing a patterned polyelectrolyte membrane by means of surface contact between a microsphere and a substrate and self-assembling nanoparticles on the polyelectrolyte membrane. Different types of nanoparticles can be modified on different areas on a surface of the substrate through modifying the different types of nanoparticles on the polyelectrolyte membranes in different steps so that a composite nanoparticle assembled body is prepared on the surface. The product prepared by using the method has a regular surface structure. Meanwhile, different materials in the regular structure have different functions. The method is possible to partially replace a plurality of traditional micro-nano processing technologies; and the obtained surface assembled body has potential applications in nanodevices, biological materials and information technology.