30results about How to "Electromagnetic Field Enhancement" patented technology

The invention discloses a silicon nano cone array coated with a gold film as well as a preparation method and an application thereof. The array is a silicon nano cone sequence array with a surface coated with a gold film, wherein the conical bottom diameter of silicon nano cones forming the silicon nano cone sequence array is 180nm to 220nm, the cone height is 450nm to 550nm, the cone period is 250nm to 350nm, and the thickness of the gold film is 15nm to 25nm. The preparation method comprises the following steps: first synthesizing polystyrene colloidal spheres on a silicon substrate to form a single-layer colloidal crystal template by virtue of a gas-liquid interface self-assembling technology, placing the silicon substrate with the single-layer colloidal crystal template in a sulfur hexafluoride atmosphere, etching the silicon substrate by virtue of plasma to obtain the silicon substrate with silicon nano cone sequence array, and depositing the gold film on the silicon substrate with the silicon nano cone sequence array by utilizing an ion beam sputtering technology or thermal evaporation deposition technology to obtain a target product. The silicon nano cone array can be used as an active substrate of surface enhanced raman scattering to measure the content of clenbuterol hydrochloride attached thereon.

The invention discloses a gold nanoparticle-silver nano-semisphere array as well as a preparation method and the application of the array. The array is an ordered array which is placed on a silver membrane of a substrate and attached with silver nano-semispheres, wherein the sphere diameter of the silver nano-semisphere is 85-95 nm; the sphere interval is less than or equal to 10 nm; the gold nanoparticles are modified on the silver nano-semispheres; the particle size of the gold nanoparticle is 5-10 nm. The preparation method comprises the following steps: sequentially performing secondary anodic oxidation, reaming treatment and silver membrane plating on one side of an aluminum sheet, so as to obtain an aluminum oxide template covered with the silver membrane on one side and collected with the silver nano-semispheres in the hole; adhering and fixing the substrate to the silver membrane; then, placing the aluminum oxide template covered with the silver membrane and the substrate on one side and collected with the silver nano-semispheres in the hole in an alkali solution to etch off the aluminum oxide template, and then putting the rest in an ion sputtering device to perform gold sputtering for 8-12 s under the sputtering current is 35-45 mA, so as to obtain the objective product. The array can be taken as an active substrate for enhancing raman scattering on the surface, so that the content of trace rhodamine or polychlorinated biphenyl 3 attached on the array can be measured by a laser raman spectrometer.

A heating container for microwave oven is composed of a main body made of plastics and having a bottom made of dielectric plastics or ceramics, a metal layer on its side wall, and a metal ring on its bottom, and a cover with evaporate outlet, a safety valve and a metal ring. Its advantages are high effect and high safety.

The invention discloses a miniature circuit breaker with a high breaking capacity, which comprises a shell, wherein the shell is internally provided with a magnet yoke assembly, a moving contact assembly, an arc extinction system and an actuating mechanism. A magnet yoke, a wiring board and a connecting sheet in the magnet yoke assembly are designed into a whole to ensure that the structure of the magnet yoke assembly is simplified, the quantity of soldered dots of the magnet yoke assembly is reduced and the internal resistance of a circuit breaker is lowered; a moving contact in the moving contact assembly comprises a contact support and a contact which are connected, the specific gravity of the contact support is smaller than that of the moving contact, and a magnet conductive plate is additionally arranged on the back of the moving contact and used for accelerating the transfer of an electric arc, therefore, the breaking capacity of the circuit breaker is improved; and a plurality of linkage lug bosses used for multipolar linkage are arranged on a contact support body, thus the linkage performance of the multipole circuit breaker is effectively ensured. A coil is connected with the moving contact through an annealed copper wire in a spot welding manner, and the soldered spots are moved from the linkage lug bosses to the moving contact without influencing the linkage property of the multipole circuit breaker. The invention has the advantages of high breaking capacity, high consistency of the interelectrode linkage and good reliability performance.

The invention belongs to the field of chemical engineering, and provides a preparation method for special-shaped gold nanocrystals and application on detection of tripolycyanamide by using surface enhanced Raman scattering. The preparation method comprises the following steps of preparing gold by using trisodium citrate as a stabilizer; using hexadecyl trimethyl ammonium bromide, a chloroauric acid, silver-bearing salt liquor and an ascorbic acid as growth-promoting media; preparing nanogold by using an organic acid as an additive; and performing resolution after centrifugal separation. The special-shaped gold nanocrystals are used for detecting Raman spectra of standard liquor or sample liquor of the tripolycyanamide. The nanogold is prepared by using a seed induction multi-step growing method, an additive containing benzene ring is added in the nanogold, and the use level of the hexadecyl trimethyl ammonium bromide is reduced, so that the cost is obviously reduced, and purification time and purification steps are reduced. The prepared nanogold has an angular structure, and can be used for detecting an enhancement substrate of trace tripolycayanamide by using surface enhanced Raman scattering; and compared with an HPLC (high performance liquid chromatography) method, the nanogold has the advantages that the analyzing time is short, the cost and the reproducibility are high, and the nanogold can be widely applied to quickly detecting the tripolycyanamide in dairy products.

A microwave cooker is composed of main body made of plastics and with a metal layer on its side wall, and a cover with steam hole, a safety valve and a metal ring. The mentioned main body has a bottom which is made up of dielectric plastics of ceramics and has a metal ring. Its advantages are simple structure, high effect and high safety.

The invention discloses a gold micro-nano structure array and preparation method as well as application thereof. The array comprises a substrate coated with a gold film, a gold microprism array is arranged on the gold film, tops of gold microprisms forming the gold microprism array are hemispheric; each gold microprism with the hemispheric top has the prismdiameter of 200nm-3[mu]m and the prism height of 300nm-6[mu]m, and is composed of gold nano particles; and the particle size of the gold nano particles is 3-30nm. The method comprises the following steps of: firstly, forming the gold film on the substrate through sputtering, then, adding the substrate coated with the gold film into a gold electrolyte as a cathode, performing electrodeposition for 8-20 hours with 30-500[mu]A/cm<2> direct current, wherein, the gold electrolyte is a mixed solution of 0.2-5g/L chloroauric acid solution and 2-50g/L polyvinyl pyrrolidone solution, thereby obtaining the target product. The gold micro-nano structure array can be used as an SERS (Surface Enhanced Raman Scattering) active substrate, and the content of rhodamine or methyl parathion attached on the gold micro-nano structure array is measured through a laser Raman spectrometer.

The invention provides a method for preparing a silver gyrus/graphene/gold film composite three-dimensional Raman enhanced substrate and application thereof. The method includes steps of depositing gold nanometer thin films on the surfaces of quartz bases by the aid of thermal evaporation processes; transferring graphene by the aid of wet processes; evaporating silver gyrus nanometer structures on the surfaces of the graphene by the aid of thermal evaporation processes to obtain the silver gyrus/graphene/gold film composite three-dimensional Raman enhanced substrate. The graphene grows by the aid of chemical vapor deposition (CVD) processes. Silver gyrus/graphene/gold film three-dimensional composite structures can be prepared on flexible ultrathin mica sheets so as to obtain flexible Raman enhanced substrates for food safety detection if the steps are repeatedly carried out.

The invention discloses a microwave plasma stove device, and relates to a heat source apparatus. The microwave plasma stove device is characterized by comprising a torch generator and a management control module and an air supply module which are connected with the torch generator; the torch generator comprises a microwave resonance cavity, a microwave generator arranged on the lower side of the microwave resonance cavity and a discharge tube arranged in the microwave resonance cavity; and an ignition conductor is embedded in the discharge tube; the lower end of the discharge tube is providedwith an air inlet, the upper end is provided with a fire outlet, and the air supply module is connected to the air inlet; and the management control module is connected with the microwave generator. Use of an electrode is avoided, the needed power consumption is small, flame with the high temperature (approximately 2000 DEG C) can be rapidly generated, and the microwave plasma stove device can rapidly and conveniently heat food, and is more convenient to use.

The invention discloses a mercury ion quantitative detection method based on a surface enhanced Raman scattering technology, which comprises the following steps: firstly, obtaining a gold nano finger array structure through nanoimprinting, then modifying specific single-stranded DNA on the Au nano finger array structure through sulfur hydrogen bonds, collapsing the finger array structure in the volatilization process of a DNA solution, and finally titrating a mercury ion solution to detect the mercury ions. Single-stranded DNA lying on the surface of Au is changed into a double-stranded DNA spiral space structure perpendicular to the surface of Au, so that terminal base molecules in the DNA are far away from a coupling enhanced electromagnetic field formed in a gap, and an SERS (Surface Enhanced Raman Scattering) signal is reduced. According to the invention, interference-free high-selectivity and high-sensitivity detection of Hg ions in the mixed solution can be realized at the same time.

The invention discloses an SERS substrate based on an Au @ Ag nanoparticle ordered array as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a two-dimensional Au nanoparticle array is prepared; then the two-dimensional Au nanoparticle array is put into a citrate buffer solution, and then a silver nitrate solution with the concentration being 0.1mol/L is added, reaction is carried out for 20-30 minutes under a room-temperature dark condition, and then cleaning is carried out to prepare the Au @ Ag nanoparticle ordered array; and finally, the Au @ Ag nanoparticle ordered array is placed into a potassium iodide solution with the concentration being 1 mmol/L to prepare the SERS substrate based on the Au @ Ag nanoparticle ordered array. According to the SERS substrate, the preparation method and the application, a Ag nanosheet is not only enable to have a sharp corner and a rough surface, but also an SERS signal can beremarkably enhanced, the large-area morphology of the nanoparticle array has the orderliness and regularity, and the uniformity and stability of the SERS signal are improved.

A related switching power supply with an accessory protection function comprises a shell and a front cover, a through hole is formed in the top of the shell, a sleeve plate is fixed in the through hole, a movable groove is formed in the top of the sleeve plate in a penetrating mode, a limiting groove is formed in the inner wall of one side of the movable groove, and a limiting block is slidably connected in the limiting groove; a limiting spring is fixedly connected between the limiting block and the inner wall of the limiting groove, a heat removal column is fixedly connected to the inner side of the limiting block, a heat removal groove is formed in one side of the heat removal column, a heat conduction groove is formed in the bottom of the heat removal column and communicates with the heat removal groove, a mounting shaft is rotationally connected to the outlet position of the heat removal groove, and first fan blades are fixedly connected to the top of the mounting shaft; and second fan blades are fixedly connected to the bottom of the mounting shaft, and the edges of the first fan blades and the second fan blades are tangent to the inner wall of the heat removal groove According to the invention, hot air flow emitted during working of components is utilized to push the outlets of the heat removal grooves in the heat removal columns to the upper part of the movable grooves, and the first fan blades and the second fan blades are pushed to rotate, so that the effects of heat dissipation and dust removal are achieved.