12results about How to "Reduce concentration difference" patented technology

The invention provides a vanadium dioxide composite electrode material and a preparation method and application thereof. The method comprises the following steps: taking vanadium leachate as a raw material, reacting with a reducing agent under the condition that the pH value is 2-6, mixing the obtained tetravalent vanadium solution with a precipitator, carrying out precipitation reaction, filtering, washing and drying the precipitate to obtain vanadium dioxide precursor particles, grafting a silane coupling agent with sulfydryl onto the surface of the vanadium dioxide precursor through coupling reaction, and carrying out vacuum drying to obtain the vanadium dioxide precursor. Silver ions are chelated under the action of sulfydryl, and silver elementary substances are deposited on the surfaces of vanadium dioxide precursor particles through reduction. And coating the composite slurry of the vanadium dioxide precursor and the carbon nanotube on the surface of a substrate, and calcining to obtain the vanadium dioxide composite electrode material. The vanadium dioxide composite electrode material is used as a negative electrode material of a battery, and the obtained battery is found to have excellent stability and reaction dynamic characteristics.

The invention discloses a membrane electrode, a preparation method thereof and a fuel cell, the membrane electrode comprises a catalyst layer and a proton exchange membrane, the catalyst layer comprises an anode catalyst layer and a cathode catalyst layer, and the anode catalyst layer and the cathode catalyst layer are respectively arranged on two sides of the proton exchange membrane; the catalyst layer and the proton exchange membrane are both doped with phosphoric acid. By macroscopically regulating and controlling the PA content of the catalyst layer and the proton exchange membrane in the membrane electrode, more three-phase reaction interfaces are constructed, so that the Pt catalyst can be fully utilized, and unnecessary migration of PA is reduced, thereby avoiding the phenomenon of acid flooding, ensuring sufficient PA in the proton exchange membrane to provide sufficient proton conductivity, and improving the proton exchange efficiency. And the power density of the fuel cell is further improved.

The utility model relates to the technical field of chemical analysis equipment, in particular to a reaction cup for a sample analyzer, which comprises a reaction cup body, and the surface roughness of the inner wall of the reaction cup body is Ra0.2-Ra6.3; the cup bottom of the reaction cup body is of a conical structure, and the conical angle of the cup bottom is 100-120 degrees; the reaction cup body is provided with the liquid inlet and the liquid outlet, the liquid inlet is located in the position, far away from the center shaft, of the conical surface of the cup bottom of the reaction cup body, after liquid is pumped away, no large bulk liquid is formed on the inner wall of the reaction cup, a thin liquid film is formed, and bulk water drop-shaped liquid residues cannot be observed. Therefore, after each emptying operation of the reaction cup, the liquid residual quantity difference of the reaction cup is reduced, the sample concentration difference is further reduced, and the test precision is improved. The problem that the measurement precision cannot meet the requirement due to different volumes and sizes of water-drop-shaped residual liquid clusters in the reaction cup is solved.

The present invention discloses an electrode flow field plate and an electrolytic water tank. The water flow field plate according to the electrode flow field plate of the embodiment of the present invention comprises a metal plate and a metal plate mesh. The metal plate has a first surface and a second surface opposite to each other in the thickness direction thereof. The metal plate is provided with a water inlet and a water outlet penetrating along the thickness direction of the metal plate. The water inlet and the water outlet are spaced apart and arranged opposite to each other along the length or width direction of the metal plate. The metal plate mesh is arranged on one of the first surface and the second surface of the metal plate. The metal plate mesh has a first end and a second end opposite to each other. The first end of the metal plate mesh is adjacent to the water inlet, and the second end of the metal plate mesh is adjacent to the water outlet. The electrode flow field plate of the embodiment of the present invention has the advantages of simple structure, adjustable overall resistance, small concentration difference between each mesh, and high overall efficiency.

This application relates to the field of two-dimensional semiconductor material preparation technology, specifically to a method for preparing monolayer molybdenum disulfide by dual-sulfur source chemical vapor deposition, comprising the following steps: Step 1, providing a chemical vapor deposition reaction chamber having an upstream region, a growth region, and a downstream region; Step 2, arranging a molybdenum-containing precursor in the growth region, and arranging a substrate above or opposite to the molybdenum-containing precursor; Step 3, arranging a first sulfur-containing precursor in the upstream region and a second sulfur-containing precursor in the downstream region; Step 4, introducing a carrier gas into the reaction chamber and heating it to cause the first sulfur-containing precursor, the second sulfur-containing precursor, and the molybdenum-containing precursor to volatilize and undergo a chemical vapor deposition reaction on the substrate surface to form a monolayer molybdenum disulfide. This invention employs a dual-sulfur source strategy, achieving large-size, uniform, and low-defect preparation of monolayer MoS2, facilitating widespread application.

The utility model discloses a boat structure, which comprises a supporting frame body and a plurality of supporting pieces fixedly arranged on the supporting frame body and arranged in a linear array, a bearing gap for accommodating a wafer is arranged between two adjacent supporting pieces, and the bearing gap comprises a mounting gap and a flow expanding gap. According to the boat structure, the flow expansion gaps are further arranged in the bearing gaps on the supporting frame body, and the center distance between adjacent wafers is increased, so that the circulation path of process gas is prolonged, the contact time of the process gas and the wafers is prolonged, the local gas concentration difference is reduced, the diffusion of the process gas is more uniform, and the yield of the wafer is improved. And the oxidation uniformity can be effectively improved by further reacting with the wafer, and the surface processing quality of the wafer is improved.

The invention provides a sizing machine, which relates to the technical field of sizing machines, and comprises a bracket and a liquid storage tank fixedly connected to the bracket, a partition plate is vertically and fixedly connected into the liquid storage box, a feeding area and a soaking area are arranged on the two sides of the partition plate, a supporting cylinder is rotationally connected to the partition plate in the length direction, yarn is wound around the outer side wall of the supporting cylinder in a crossed mode, the supporting cylinder communicates with the feeding area, a discharging hole communicating with the soaking area is formed in the side wall of the supporting cylinder, and a feeding auger is rotationally connected into the supporting cylinder. A transmission mechanism used for driving the feeding auger to rotate is arranged on the outer side wall of the liquid storage box, and driving mechanisms used for driving the yarn to move in the length direction of the liquid storage box are arranged at the two ends of the liquid storage box. The device has the effects of reducing the concentration difference of size on the upper side and the lower side of yarn, reducing the amount of sediment in the size and being beneficial to improving the yarn soaking effect.

The invention discloses an adhesive dispensing device which comprises a first shell with a first adhesive pressing cavity. The first glue pipe is provided with a glue containing cavity, a lower glue outlet and an upper glue outlet which are communicated with the glue containing cavity are formed in the first glue pipe, the upper glue outlet is formed in the side wall of the first glue pipe, the lower glue outlet is formed in the bottom of the first glue pipe, and the lower glue outlet is communicated with the first glue pressing cavity; a glue inlet of the first glue dispensing head is communicated with the first glue pressing chamber; the first glue injection channel is used for communicating the upper glue outlet with the first glue pressing chamber; and the suction or thrust generation assembly is arranged on the first shell, and the suction or thrust generation assembly is used for injecting the fluorescent glue into the first glue pressing cavity from the upper glue outlet and the lower glue outlet when the suction or thrust generation assembly generates the suction and is also used for dispensing the fluorescent glue in the first glue pressing cavity to the outside from the first dispensing head when the thrust is generated. According to the dispensing device, the concentration difference of dispensed fluorescent glue is reduced when the fluorescent glue in the glue containing cavity is precipitated, so that the dispensing yield is increased.

The application discloses a single-chip vapor deposition device and system, which comprises a base, an at least partially liftable baffle arranged around the base and surrounding a process chamber during a film forming process, a process gas inlet mechanism arranged on one side of the process chamber for supplying process gas, an exhaust port arranged in the process chamber, the exhaust port and the process gas inlet mechanism being arranged on opposite sides of the single-chip vapor deposition device, a wafer transfer port arranged on a side of the single-chip vapor deposition device different from the side where the process gas inlet mechanism and the exhaust port are arranged, and the baffle being provided with a first opening only on a side close to the process gas inlet mechanism, process gas flowing into the process chamber through the first opening, flowing horizontally on the surface of a substrate and epitaxially forming a film, and at least part of process gas not participating in a reaction and reaction byproducts being discharged from the exhaust port. The application can reduce the long velocity difference of process gas at the front and back of a substrate, so as to improve the crystal quality and film thickness uniformity of an epitaxial layer.

The utility model belongs to the technical field of flow batteries, and particularly relates to a gas circulation system of a flow battery. The flow battery gas circulation system comprises a positive electrode liquid storage tank, a negative electrode liquid storage tank, a gas inlet pipeline, a gas exhaust pipeline, a gas pressure balance pipeline and a gas transfer device, the upstream end of the air inlet pipeline is positioned above the liquid level of the positive electrode liquid storage tank; the downstream end of the gas inlet pipeline is communicated with the inlet of the gas transfer device; the outlet of the gas transfer device is communicated with the upstream end of the exhaust pipeline; the downstream end of the exhaust pipeline is located below the liquid level of the negative electrode liquid storage tank. And two ends of the air pressure balance pipeline are respectively communicated to positions above the liquid levels of the positive electrode liquid storage tank and the negative electrode liquid storage tank. The gas transfer and reactive gas absorption process is realized, volatile gas and toxic waste gas can be quickly and effectively absorbed, the pressure balance of the positive and negative electrode liquid storage tanks is maintained, the change of active components of the electrolyte during operation is avoided, and the safety and high efficiency of long-time operation of the flow battery are maintained.

This invention discloses a flavoring process for spicy bean product strips, belonging to the field of food processing and bean product seasoning technology. The method first prepares a gated seasoning liquid containing an aqueous phase and a phase-change flavor-locking oil phase, ensuring the pH of the gated seasoning liquid is 6.0–6.6 under degassing and 4.4–4.9 under carbon dioxide pressure equilibrium. Then, the spicy bean product strip blanks and the gated seasoning liquid are placed in a pressure-vacuum circulating impregnation vessel, and a breathing-style flavoring cycle is sequentially performed, involving vacuuming, carbon dioxide pressure holding, rapid depressurization, and re-vacuuming. This causes the bean protein gel network to undergo a contraction-rebound gated change between the near-isoelectric point and degassing recovery stages, thereby forming an active pump to absorb flavor. After the cycle is completed, the mixture is cooled to below 25°C, causing the phase-change flavor-locking oil phase to gel in situ, locking in the fat-soluble spicy flavor.

The utility model relates to the technical field of pharmaceutical devices, and provides a stirring device for preparing dextran, which comprises a reaction box, a feeding pipe and a discharging pipe, the feeding pipe and the discharging pipe are fixedly communicated on the reaction box, and stirring blades are arranged in the reaction box. The local concentration gradient caused by non-uniform mixing of solutions in the reaction box can be effectively reduced through the mixing assembly, the stirring uniformity of the solutions can be improved by adding a small amount of raw materials for multiple times through the feeding mechanism during stirring, and then it can be ensured that the raw materials added every time are fully dissolved and mixed; the problem of non-uniform mixing possibly caused by adding all the raw materials at one time is avoided; according to the utility model, the stirring-expanding assembly is designed, and when the stirring blades move downwards and rotate to the bottom of the reaction box, the stirring-expanding assembly can enable the stirring-expanding blades to expand the stirring range, so that sediments at the bottom of the reaction box are mixed with a solution at the upper part, and the concentration difference is reduced, thereby improving the uniformity of the whole reaction system.