1690 results about "Ultrapure water" patented technology

A method for efficiently and safely cleaning an apparatus for tin compound and a highly purified tin compound apparatus are provided. A cleaning method for an apparatus that has been in contact with a tin compound having formula (1) below includes at least steps (A) to (C), in which step (B) is performed after step (A), and step (C) is performed after step (B):(A) a step of cleaning the apparatus with a non-protic solvent,(B) a step of cleaning the apparatus with alcohol, and(C) a step of cleaning the apparatus with ultrapure water having a resistivity value of 17 MΩ·cm at 25° C.RpSnXm  (1)In formula (1), R is a hydrocarbon group, p is an integer from 1 to 3, X is a hydrolyzable substituent, and m=4−p.

A method for efficiently and safely cleaning an apparatus for a tin compound and a highly purified apparatus for a tin compound are provided. A method of cleaning an apparatus that has been in contact with a tin compound having formula (1) includes at least steps (A) to (C) in this order:(A) a step of cleaning the apparatus with a non-protonic solvent,(B) a step of cleaning the apparatus with an acidic aqueous solution and / or alkaline aqueous solution, and(C) a step of cleaning the apparatus with ultrapure water having a resistivity of 17 MΩ·cm at 25° C.RpSnXm  (1)R is a hydrocarbon group, p is an integer of 0 to 3, X is a hydrolyzable substituent, and m=4-p.

The invention discloses a paclitaxel drug resistance SERS (Surface Enhanced Raman Scattering) substrate and a detection method. Belongs to the technical field of drug resistance detection. The SERS substrate is mixed with ultrapure water after centrifuging a silver nanoparticle-sodium citrate suspension, and the mixture is dropwise added to a silicon wafer and dried to form a coffee ring structure. During detection, cancer tissue crushing liquid is dropwise added to the center of the substrate, SERS signals are collected through a Raman spectrometer and compared with a pre-established drug resistance / sensitivity spectrum database, and drug resistance is judged according to characteristic peaks at 820 cm <-1 >, 1180 cm <-1 >, 1270 cm <-1 > and 1450 cm <-1 >. The method is easy and convenient to operate, short in detection time (within 10 minutes), high in sensitivity and suitable for rapid screening of paclitaxel drug resistance of breast cancer patients.

The invention discloses a modularized ultrapure water preparation and on-line monitoring system, which comprises a pretreatment module, a purification module, a monitoring module and a control module, and is characterized in that a dynamic monitoring end is arranged, and when ultrapure water preparation is monitored in real time, a multi-parameter fusion detection mechanism and self-adaptive threshold analysis are integrated; meanwhile, the abnormal state of the water quality is dynamically judged based on the conductivity, TOC and particulate matter data collected in real time, the sudden change risk of the water quality output by the purification module can be recognized in real time, error accumulation caused by traditional single-point monitoring is avoided, and therefore the purity detection reliability of the ultrapure water is improved; and the reverse osmosis unit and the electrode deionization unit of the purification module can immediately respond to the effluent parameter change of the pretreatment module, so that the hidden dangers of membrane blockage and recovery rate reduction caused by water quality fluctuation are reduced, and the energy consumption redundancy is reduced while the water quality stability is ensured.

The invention discloses a monitoring method and system for identifying crop drought based on leaf morphology, and relates to the field of agricultural drought monitoring, and the method comprises the following steps: selecting a completely unfolded healthy leaf, cleaning with ultrapure water, blow-drying with nitrogen, and fixing on a standard objective table to obtain a standardized leaf sample; based on the standardized leaf sample, a high-resolution scanner is used for obtaining a front gray image and a back gray image of the leaf, and a binary image with a clear vein network is obtained through image splicing and binarization processing; skeletonizing the binary image with the clear vein network, and calculating the vein fractal dimension by adopting a box counting method to obtain a fractal dimension change rate; the method is in a fixed detection area of a standardized leaf sample. Through innovative leaf vein fractal dimension analysis and contact angle dynamic measurement, a crop drought monitoring system is constructed, and in the aspect of leaf vein analysis, skeletonization processing and a box counting method are adopted to realize accurate quantification of a leaf vein network topological structure.

The invention discloses a purification method for removing quartz inclusion, which comprises the following steps: calcining a quartz sand raw material at high temperature for a certain time, then taking out and quickly putting into cold water for cold quenching; dehydrating quartz sand, feeding into a microwave reactor, heating to a set temperature, and keeping for a period of time; after the reaction is finished, cleaning the quartz sand with ultrapure water; filling the quartz sand into a high-temperature and high-pressure reactor, introducing supercritical carbon dioxide and hydrogen fluoride mixed gas, and keeping the temperature and the pressure for a period of time; and after the reaction is finished, discharging gas to obtain the high-purity quartz. Through two-stage heat treatment, a channel between gas-liquid inclusions in quartz particles and the outside can be efficiently opened, and meanwhile, the supercritical method ensures that impurities in the inclusions can be effectively dissolved out; the treatment time is short, the required temperature is low, the acid consumption is less than 10%, and the method has the advantages of high efficiency and low cost.

The invention relates to a preparation method of monodisperse spherical alumina powder with uniform granularity. The preparation method comprises the following steps: dissolving and stirring an aluminum source, a precipitator and a dispersing agent in ultrapure water to prepare an aluminum oxide precursor solution; transferring the prepared aluminum oxide precursor solution into a hydrothermal reaction kettle, carrying out heating reaction, after the hydrothermal reaction is finished, naturally cooling to room temperature, alternately and respectively washing with ultrapure water and ethanol, and drying to obtain aluminum oxide precursor powder; and sintering the prepared aluminum oxide precursor powder in a muffle furnace in an air atmosphere to obtain the spherical aluminum oxide powder. The hydrothermal method is adopted to react in a high-temperature and high-pressure environment, so that the reaction uniformity is improved, and the spherical aluminum oxide precursor with uniform granularity and consistent morphology is obtained. The bending strength of the obtained ceramic material is remarkably improved, and the highest bending strength reaches 245MPa. The method has wide application prospects in the fields of heat-conducting composite materials, integrated circuit films, substrate materials, 3D printing materials, precision polishing materials and the like.

The invention relates to the technical field of food processing, and discloses casein-tea polysaccharide-polyphenol composite nanoparticles and a preparation method of the casein-tea polysaccharide-polyphenol composite nanoparticles, and the preparation method comprises the following steps: mixing large yellow tea polysaccharide with a casein solution to obtain a CS / TPS mixed solution; performing glycosylation modification on casein in the CS / TPS mixed solution by adopting a Maillard reaction to prepare a casein-polysaccharide copolymer solution; the preparation method comprises the following steps: mixing a plurality of catechins, dissolving the catechins in ultrapure water to obtain a mixture stock solution, mixing the mixture stock solution and a casein-polysaccharide copolymer solution according to a volume ratio of 1: 16, stirring for 1 hour for self-assembly, pre-freezing the stirred solution at-80 DEG C, and freeze-drying for 48 hours to obtain CS-TPS-MIX nano-composite powder. According to the invention, a polyphenol delivery system with a dual antioxidant synergistic mechanism is constructed through a Maillard reaction mediated nano-composite technology, and the system is stable in structure, so that the release of polyphenol is more controllable.

The invention provides a photo-thermal evaporation material based on black titanium dioxide as well as a preparation method and application of the photo-thermal evaporation material. The preparation method comprises the following steps: mixing urea, absolute ethyl alcohol and tetrabutyl titanate into a solution A, mixing absolute ethyl alcohol, ultrapure water and hydrochloric acid into a solution B, dropwise adding the solution B into the solution A, mixing to form a white colloid, heating in a water bath, drying, and calcining in a nitrogen atmosphere to obtain black titanium dioxide powder; the preparation method comprises the following steps: fully mixing a certain amount of black titanium dioxide, sodium alginate and ultrapure water to form a uniform dispersion liquid, dipping the pretreated polyurethane sponge in the dispersion liquid, and crosslinking with a calcium chloride solution to prepare the photo-thermal evaporation material of the black titanium dioxide-calcium alginate composite hydrogel. The photo-thermal evaporation material breaks through the photo-thermal application bottleneck of traditional titanium dioxide, has excellent evaporation rate and seawater desalination performance, and can effectively remove various printing and dyeing wastewater to obtain clean water.

The invention discloses a method for enriching light metal ions in a pore channel based on carbon nanofiber / carbon fiber nano confinement, and belongs to the technical field of sample pretreatment, and the method comprises the following steps: S1, preparing a carbon nanofiber / carbon fiber confinement material; and S2, putting the carbon nanofiber / carbon fiber confinement material obtained in S1 into a light metal ion solution, and stirring. According to the method for enriching the light metal ions in the pore channel based on the carbon nanofiber / carbon fiber nano confinement, the carbon nanofiber / carbon fiber is used as a confinement fluid carrier, ultrapure water, methanol or n-hexane is used as an extracting agent, a chelating agent does not need to be introduced, the method is green and environmentally friendly, the mass transfer rate is increased, and the method is suitable for large-scale industrial production. Therefore, high enrichment of light metal ions in water is realized.

The invention relates to a purification method of high-purity diamond, and relates to the technical field of diamond purification. The purification method comprises raw material pretreatment, microwave-assisted ionic liquid stripping, solid-liquid separation and ionic liquid recovery, deep purification, separation and drying, and the raw material pretreatment comprises the following steps: crushing an impurity-containing coarse diamond raw material into particles of 2-5mm, then carrying out wet ball milling in ethanol for 4-6 hours, refining the particles to 50-200 microns, and carrying out microwave-assisted ionic liquid stripping on the particles to obtain refined particles; immersing the particles into a mixed solution of 10% diluted hydrochloric acid and 2% ammonium bifluoride, performing ultrasonic treatment for 2 hours, and performing centrifugal washing with ultrapure water until the particles are neutral; the microwave-assisted ionic liquid stripping method comprises the following steps: mixing the pretreated raw material with an ionic liquid according to a mass ratio of 1: (5-10), and carrying out microwave treatment for 10-30 minutes to obtain a reaction mixture. According to the purification method, diamond impurities are efficiently removed, meanwhile, the surface structure of the diamond can be protected against damage, waste liquid can be recycled, and the influence on the environment is small.

The invention provides a preparation method and application of red nano-selenium particles, and relates to the technical field of nano-medicines.The preparation method comprises the steps that sodium selenite is dissolved in ultrapure water, silicate microspheres containing copper, zinc and aluminum are added, the pH value is 4.8, 1.5 M of ascorbic acid solution is dropwise added while stirring, the temperature is increased till solid ascorbic acid is added, the pH value is adjusted through NaOH, and nano-selenium suspension liquid is obtained through stirring reaction; the preparation method comprises the following steps: mixing and stirring a nano-selenium suspension, a sodium alginate sulfydryl graphene oxide mixture and a chitosan oligosaccharide citric acid buffer solution, centrifugally washing, and freeze-drying to obtain red nano-selenium particles, and preparing the copper-zinc-containing aluminosilicate microspheres through mesoporous template calcination and copper-zinc co-doping. The red nano-selenium particles prepared by the method have a core-shell structure, uniform particle size, high oxidation resistance and remarkable interface bonding strength.

The invention provides semiconductor process equipment and a use method thereof. The semiconductor process equipment comprises a reaction cavity; the evaporator comprises an evaporation cavity, a premixing head, a gas outlet, a carrier gas inlet and an ultrapure water inlet; the premixing head is located at the top of the evaporation cavity, and the carrier gas inlet and the ultrapure water inlet are communicated with the evaporation cavity through the premixing head; the gas outlet is positioned at the bottom of the evaporation cavity; wherein a sleeve structure with a heating function is arranged in the evaporation cavity; the sleeve structure comprises a first sleeve, a second sleeve and a third sleeve; the first sleeve is connected with the top of the evaporation cavity, the lower portion of the first sleeve is located in the evaporation cavity and suspended, and an opening of the premixing head is located in the first sleeve. The second sleeve is connected with the bottom of the evaporation cavity, the upper portion of the second sleeve is located in the evaporation cavity and suspended, and the air outlet is located in the second sleeve. The third sleeve is located in the middle of the evaporation cavity, the upper portion of the third sleeve is inserted into the first sleeve, the lower portion of the third sleeve is inserted into the second sleeve, and the upper portion and the lower portion of the third sleeve are not communicated.

The present invention discloses a platinum electroplating solution, a preparation method thereof and an application in semiconductors, which comprises the following raw materials: 0.5-10 g / L of platinum salt PEP, 15-35 g / L of ethylenediamine sulfate, 5.0-29 g / L of malonic acid, 5.0-40 g / L of ammonium acetate, the balance being ultrapure water and ammonia water; the pH value of the platinum electroplating solution is adjusted to 7.0 with ammonia water; the method for preparing the coating comprises the following steps: S1, degreasing and pickling the semiconductor device to be processed; S2, selecting corresponding electroplating conditions and configuring a corresponding anode and its anode mask; S3, performing electroplating; S4, automatically adding the platinum salt PEP solution in a linked manner; S5, adjusting the pH value of the platinum electroplating solution; S6, stopping electroplating after reaching the target coating thickness or the preset electroplating time. The platinum metal film formed by the present invention has excellent morphology, uniform distribution, high wear resistance and excellent compactness.

The invention relates to the technical field of ultrapure water particle monitoring, and discloses a light scattering and image recognition dual-method ultrapure water particle monitoring system and method. The system comprises a light scattering detection module, an image recognition detection module, a double-channel parallel sampling module, a multi-modal data fusion module and a dynamic feedback control module. The light scattering detection module detects large particles, the image recognition detection module detects small particles, and double-channel parallel sampling provides a stable water sample environment for the light scattering detection module and the image recognition detection module respectively. The multi-modal data fusion module fuses data to generate a full-particle-size particle distribution map, and the dynamic feedback control module adjusts detection parameters according to the full-particle-size particle distribution map. According to the invention, full-particle-size precise monitoring is realized, the monitoring precision, stability and reliability are improved, detection parameters can be adaptively optimized, the method is widely applied to the industries of electronic chip manufacturing, biological medicine and the like, and the water quality of ultrapure water is effectively guaranteed.

The invention relates to a composition for polishing optical fiber image-transmitting composite glass and a polishing method. The composition comprises the following substances in percentage by mass: 10-25% of rare earth oxide; the content of the ultrapure water is 72%-88%; the content of the additive is 0.5%-4%. The polishing method comprises the following steps that a polishing medium solution is prepared, specifically, an additive is added into ultrapure water, ultrasonic stirring is conducted for the first time till the additive is completely dissolved, then rare earth oxide is added, ultrasonic stirring is conducted for the second time, and the polishing medium solution is obtained after the rare earth oxide is evenly dispersed; and polishing treatment: carrying out surface polishing treatment on the optical fiber image-transmitting composite glass by using a polishing medium solution. When the composition is used for polishing the optical fiber image-transmitting composite glass, the surface quality of the optical fiber image-transmitting composite glass is improved, the problem that pits are generated on the surface of the optical fiber image-transmitting composite glass is avoided, and the composition has the advantages of improving the polishing efficiency and the polishing effect.

The invention discloses a wafer cleaning device based on ultrasonic cleaning, and relates to the technical field of wafer cleaning devices. Comprising a cleaning machine outer tank body, a wafer cleaning glass tank, an ultrasonic cleaning tank, an ultrasonic device, a bottom plate, a housing, a cleaning tank rail, a flow dividing water supply device and a bubble removing uniform vibration device, ultrapure water serves as a medium, ultrasonic vibration is effectively conducted to the wafer cleaning glass tank, a strong acid solution in the tank is driven to uniformly vibrate, and efficient cleaning of wafers is achieved. High turbulence pulsation and local shearing stress are formed at the junction of oblique water replenishing and the stock solution, large bubbles are sheared into small bubbles, bubble gathering is prevented, and the liquid purity and the ultrasonic cleaning efficiency are improved. Under the centrifugal separation action of the rotational flow connecting base and the annular rotational flow piece, bubbles in water flow are concentrated in the center position, ultrapure water on the outer side is rapidly discharged, the bubbles are efficiently absorbed after making contact with the hydrophobic porous membrane, and the bubble removing effect is remarkably improved.

The invention discloses a preparation method of an artificial cell coated with a macrophage membrane, and belongs to the technical field of artificial cell preparation. The preparation method comprises the following steps: dissolving poly (diallyldimethylammonium chloride) and sulfobutyl-beta-cyclodextrin in ultrapure water, and mixing an aqueous solution of the poly (diallyldimethylammonium chloride) and an aqueous solution of the sulfobutyl-beta-cyclodextrin to obtain a PDDA / SBE-beta-CD condensation liquid droplet solution; and mixing the macrophage membrane suspension and the PDDA / SBE-beta-CD condensed fluid drops in an equal mass ratio, and realizing in-situ coating of the macrophage membrane by adopting an ultrasonic coating technology to obtain the artificial cell coated with the macrophage membrane. The PDDA / SBE-beta-CD condensation liquid droplet constructed by the invention has good stability under the conditions of physiological salt concentration and pH and at 37 DEG C; the artificial cell coated with the macrophage membrane is prepared by mixing with the macrophage membrane suspension, and the macrophage membrane serving as a shell not only can prevent aggregate aggregation, but also can improve the structural stability and biocompatibility.

The invention provides a passivation method for a stainless steel heat dissipation device, and relates to the technical field of stainless steel surface passivation treatment.The passivation method comprises the following steps that a passivation container is prepared, and a semi-finished stainless steel uniform-temperature plate subjected to laser edge sealing is placed in the passivation container; adding a certain amount of ultrapure water into the passivation container 2, and isolating the semi-finished product of the stainless steel uniform-temperature plate from air; the passivation container is heated and pressurized for a certain period of time, a Fe3O4 passivation layer is generated on the surface of a semi-finished product of the stainless steel uniform-temperature plate, the stainless steel uniform-temperature plate is passivated for a certain period of time only through water vapor in the air-isolated, high-temperature and high-pressure environment, iron in stainless steel reacts with the water vapor at the high temperature and high pressure, Fe3O4 is generated, and the good passivation effect is achieved. The technical problem that the long-term reliability of the stainless steel vapor chamber is affected due to the fact that high-temperature natural passivation is mainly used for secondary passivation of the stainless steel vapor chamber in the current industry and the protection effect of a passivation layer is poor is solved.

The invention relates to the technical field of high-purity quartz purification methods, in particular to a high-purity quartz green low-consumption purification method which comprises the following steps: S1, plasma-assisted crushing pretreatment; s2, complex acid leaching-microwave synergistic impurity removal; s3, fluidized chloridizing roasting; s4, nano bubble water washing-targeted adsorption; s5, performing vacuum heat purification; according to the purification method of the high-purity quartz, the step of complex acid leaching-microwave synergistic impurity removal is adopted, highly toxic hydrofluoric acid in a traditional chemical acid leaching method is abandoned, and the toxicity of waste liquid is greatly reduced; compared with a traditional high-temperature chlorination method which needs a high temperature of 1300 DEG C or above, the method adopts fluidized chlorination roasting, so that the roasting temperature is reduced by 500 DEG C, and the energy consumption is reduced by 40%; nano-bubble ultrapure water is adopted for ultrasonic cleaning, the cleaning efficiency can be improved by 50%, and residual impurities are effectively removed; through innovative design and synergistic effect of all the steps, ultra-high purity of SiO2 with the purity being greater than or equal to 99.996% is realized, and meanwhile, environmental protection, energy conservation and consumption reduction as well as industrial stable production are taken into consideration.

The invention discloses a cutting and polishing combined machining treatment method suitable for polycrystalline silicon. The method comprises the following steps: step 1, silicon ingot pretreatment: loading historical process data of a silicon ingot in combination with a block chain technology, generating a machining parameter packet, and issuing the machining parameter packet to cutting and polishing equipment to form a machining quantization instruction set; a plasma channel is formed through combination of femtosecond laser focusing and high-frequency electromagnetic field constraint for cutting, annular laser is synchronously used for deep micro-area fusion polishing, and the surface roughness of the cut silicon wafer is reduced by means of argon protection and the surface tension self-leveling effect; 3, polishing: immersing the anode of the silicon wafer into TEMPO / [EMIM] [BF] electrolyte, and regulating and controlling by using pulse voltage; 4, cleaning and drying, wherein megasonic assisted nanobubble ultrapure water is adopted for flushing, and Malangori drying is carried out; and 5, quality control: verifying the surface appearance and the subsurface defect density, and carrying out secondary processing flow on the abnormal silicon wafer.

The invention belongs to the technical field of iron ion detection, and particularly relates to a rapid detection method for ferric ions in water, which comprises the following steps: a fluorescent probe preparation step: taking trihydrate of copper nitrate and tryptamine, adding into a centrifuge tube in sequence, adding ultrapure water, performing ultrasonic dissolution, transferring into a high-pressure reaction kettle, and performing hydrothermal reaction to obtain a fluorescent probe; cooling to room temperature, centrifuging the obtained yellow green solution in a centrifugal machine, and filtering the supernate through a microfiltration membrane to obtain a copper-doped carbon quantum dot CuCDs stock solution, namely the fluorescent probe; analyzing and determining Fe < 3 + >: taking the diluent of the prepared CuCDs solution, adding the diluent into a centrifugal tube containing a Fe < 3 + > standard solution, uniformly mixing, carrying out fluorescent quantitative analysis and detection, and exploring the change rule of the fluorescence intensity ratio of CuCDs; according to the rapid detection method for Fe < 3 + > provided by the invention, the synthesized CuCDs have high sensitivity, can realize on-site rapid detection of Fe < 3 + > in a water medium, and shows a wide application prospect in the field of environmental monitoring.

The invention discloses an antibacterial composite aerogel coating and a use method thereof. The use method comprises the following steps: step 1, selecting polyvinyl alcohol with the alcoholysis degree of 85-99%; step 2, weighing polyvinyl alcohol and adding the polyvinyl alcohol into ultrapure water to prepare a polyvinyl alcohol solution with the concentration of 0.5-10.0 g / ml; step 3, cooling the polyvinyl alcohol solution obtained in the step 2 to room temperature; step 4, adding a material MOF (ZIF-8) and graphene into the solution, and stirring; 5, adjusting the pH value of the solution to be neutral, and continuously stirring the solution to ensure that solutes are completely uniform; and step 6, adding 3-aminopropyltriethoxysilane as a cross-linking agent, and stirring the solution to convert the solution into a stable gel state from a liquid state. The material provided by the invention not only can overcome the defects of the existing aerogel material, but also has stronger mechanical strength, higher stability and multiple functions, and is suitable for wider application scenarios.

The invention discloses a method for efficiently and rapidly extracting O-chain oligosaccharide. The method comprises the following steps: (1) adding sufficient saturated ammonia water into an extracted glycoprotein sample for reaction; (2) adjusting the pH value of the reacted sample to be neutral by using a 10% formic acid solution, and drying to obtain a dried sample; (3) adding ultrapure water into the dried sample, fully dissolving, centrifuging at a high speed, and taking a supernatant solution; injecting the supernatant solution into a porous graphite carbon column which is pre-treated and activated in advance, and after the supernatant solution completely passes through the carbon column, adding ultrapure water to wash the carbon column so as to remove salt ions; and eluting the O-sugar chain adsorbed on the carbon column by using an eluent, collecting the eluent, and drying to obtain the O-chain oligosaccharide. The method disclosed by the invention is simple to operate, rapid, efficient, sustainable, green and environment-friendly; the method can be widely used for extracting O-chain oligosaccharide of plant and animal samples; the problems of high extraction cost, time consumption, low yield and the like in the prior art are solved.

The invention discloses ultrasonic cleaning equipment and method for high-purity silicon carbide particles. The ultrasonic cleaning equipment comprises a cleaning tank, a roller is horizontally arranged in the cleaning tank, and an ultrasonic generator is arranged at the bottom of the cleaning tank; silicon carbide particles to be cleaned are placed in the roller, meshes are evenly formed in the side face and the bottom face of the roller, and the hole diameter of the meshes is smaller than the particle diameter of the silicon carbide particles. The ultrasonic generator is used for carrying out ultrasonic cleaning on silicon carbide particles in the roller, the roller is driven by a roller driving system to rotate, a spraying water path is arranged in the roller, and the spraying water path enables impurities floating in the roller to directionally migrate along with a surface layer flow field so as to discharge separated graphite and dust out of the roller; graphite and fine dust attached to the surfaces of silicon carbide particles are separated and suspended in ultrapure water through mechanical rotation and the ultrasonic cavitation effect, the spraying head continuously discharges pollution in a directional mode while overflowing is conducted, and finally the cleaning purpose is achieved.

The invention discloses bi-crosslinking self-reinforced hydrogel based on endogenous glucose in-situ initiation as well as a preparation method and application of the bi-crosslinking self-reinforced hydrogel, and relates to the technical field of biomedical materials. The double-crosslinking self-enhanced hydrogel is prepared from the following components in concentration: 1 to 3 weight percent of hyaluronic acid-tyramine, 0.8 to 1.2 weight percent of sodium alginate, 1 to 100 mmol / L of calcium carbonate, 0.0001 to 10 U / mL of horse radish peroxidase, 20 to 40 U / mL of glucose oxidase and the balance of ultrapure water. The invention also discloses an application of the double-crosslinking self-reinforced hydrogel in preparation of a filling and repairing product for soft tissue defects. The hydrogel disclosed by the invention can be filled in a tissue defect part in an injection manner, glucose in body fluid is utilized to initiate crosslinking in situ to form the hydrogel with excellent mechanical properties and long-term stability, and meanwhile, the hydrogel is good in biocompatibility and relatively high in application value.

The invention relates to the technical field of surface treatment, discloses a dust-free cleaning process for an AL meltallizing coating, and aims to overcome the defects of an existing cleaning process for the AL meltallizing coating in the aspects of removing particles in micro-pores and passivating tips prone to falling off. The process comprises the steps of ultrapure water pre-cleaning, supercritical fluid deep cleaning, plasma surface modification, high-purity inert gas microjet purging and high-temperature vacuum degassing and surface stabilization. By the adoption of the technical scheme, the cleanliness of the AL meltallizing coating can be remarkably improved, particles and organic pollutants in micro-pores can be thoroughly removed, tips prone to falling off are passivated, secondary pollution is avoided, the cleaning period is shortened, and the production yield of semiconductors and liquid crystal panel products and the equipment utilization rate are increased.

The invention provides a celluloid nitrocotton stability quantitative determination method based on conductivity analysis, and the method comprises the following steps: determining the conductivity of standard nitrogen oxide gas dissolved in an aqueous solution by adopting a conductivity meter through a standard gas simulation mode according to the criterion of Beckmann-Lockg method 2mL / g; taking the numerical value as a stability index critical value of the celluloid nitrocotton; the method comprises the following steps: absorbing nitrocotton with the same mass by using ultrapure water, heating at 132 DEG C for 2 hours, releasing nitrogen oxide gas, recording the change value of the conductivity in the solution along with time in real time by using an oxidation stability tester, obtaining the change value of the conductivity after 2 hours, and determining the content of nitrogen oxide according to the comparison between the conductivity value and a critical value. And judging whether the stability of the celluloid nitrocotton sample is qualified or not. The method provided by the invention can solve the technical problem that accurate quantitative judgment is difficult to realize due to large sample quantity, high safety risk, tedious operation process and large color change error of test paper observed by human eyes in the traditional method.

The present invention discloses a nano copper-based catalyst, its preparation method, and its application in the electrocatalytic reduction of carbon dioxide and carbon monoxide. Copper chloride (or copper nitrate, copper acetate) is dissolved in ultrapure water, and a sodium borohydride solution is added dropwise. Stir at room temperature for 5-60 min, filter, and dry to obtain a nano copper catalyst. Further, through a displacement reaction, nano copper-palladium and copper-silver catalysts are obtained. The present invention is applied to the electrocatalytic reduction of carbon monoxide. In a membrane electrode assembly (MEA) electrolyzer, the Faraday efficiency of multi-carbon products (C2+) reaches up to 95%, the partial current density reaches up to 3 A cm-2, and the overall electrolyzer energy efficiency reaches up to 39%. It can stably electrolyze for 30 hours at 1 A cm-2. This nano copper catalyst is applied to the electrocatalytic reduction of carbon dioxide. In an MEA electrolyzer, the Faraday efficiency of C2+ reaches up to 66%, and the partial current density reaches up to 331 mA cm-2.

The invention discloses a method for determining the content of chloride ions in coal gas, and relates to the technical field of determination of chloride ions in coal gas. The method for measuring the content of the chloride ions in the coal gas comprises the following steps: S1, a sampling link, S2, an analysis stage and S3, a calculation process, in the sampling link S1, two absorption bottles filled with ultrapure water and an empty absorption bottle are sequentially connected in series at a coal gas sampling opening, the absorption bottle is connected with a high-position gas diffusion pipe by virtue of a wet-type gas flow meter, and then gas is introduced at the flow speed of 0.5 L / min; s2, an analysis stage: pouring the absorption liquid in the two absorption bottles into a beaker, heating to boil, maintaining for 30 seconds, and then cooling to normal temperature for later use; the content X1 of chloride ions in the absorption liquid is calculated, and the formula is X1 = (V1-V0) * C * 0.03545 / V * 10 {6} * 35.5. According to the method, accurate sampling is conducted, an absorption bottle is connected in series, the flow speed is controlled, high-purity ultrapure water is matched, the chloride ion absorption efficiency and accuracy are greatly improved, and a foundation is built for follow-up accurate measurement.