246results about How to "Optimizing the Reaction Temperature" patented technology

Methods for making cDNA molecules, for amplification of RNA by PCR and for preparation of cDNA libraries are provided. Kits for making cDNA molecules also are provided. Compositions are also provided comprising mixtures of reagents, including reverse transcriptases, buffers, cofactors and other components, suitable for immediate use in conversion of RNA into cDNA and RT PCR without dilution or addition of further components. These compositions are useful, alone or in the form of kits, for cDNA synthesis or nucleic acid amplification (e.g., by the Polymerase Chain Reaction) or for any procedure utilizing reverse transcriptases in a variety of research, medical, diagnostic, forensic and agricultural applications.

The invention discloses a modified phenol formaldehyde resin and a preparation method thereof, relating to the field of phenol formaldehyde resins. The preparation method comprises the following steps: reacting 100 parts of phenol, 10-200 parts of lignin and 1-20 parts of acidic catalyst at 80-200 DEG C for 2-8 hours to form a reaction liquid; regulating the temperature of the reaction liquid to 60-110 DEG C, adding 50-200 parts of formaldehyde and 2-20 parts of composite catalyst, and reacting for 1-5 hours to form a sticky matter; washing the sticky matter in 60-70 DEG C water 2-5 times, and dehydrating to obtain a lignin phenol formaldehyde resin; and pulverizing the lignin phenol formaldehyde resin to 200 meshes, and evenly mixing with 2-20 parts of powder nitrile-butadiene rubber to obtain the modified phenol formaldehyde resin. The free phenol content of the modified phenol formaldehyde resin is 2-5%, the thermal decomposition temperature is 400-490 DEG C, the toughness and strength are high, and the friction material prepared from the modified phenol formaldehyde resin has high adhesive property and frictional property.

The invention relates to a method for preparing orthorhombic black phosphors monocrystals. The method comprises the following steps: mixing a phosphorus raw material, elemental Sn and a mineralizer SnI4, placing the obtained mixture in a quartz tube, carrying out vacuum pumping and high temperature sealing, placing the sealed quartz tube in a muffle furnace, and carrying out optimized temperature programming and cooling to prepare black phosphorus. Black phosphorscrystals obtained in the invention have the advantages of large size, good crystallization performance and high purity, and the preparation method has the advantages of low device requirements, easy realization, and provision of great convenience for subsequent black phosphorus application and development.

The invention relates to a frosting liquid, a preparation method and uses thereof, and an anti-glare glass preparation method, and provides a frosting liquid, which is prepared by mixing the followingraw materials by weight: 10-17 parts of ammonium fluoride, 7-12 parts of sulfuric acid, 3-5 parts of calcium fluoride, 3-5 parts of ammonium sulfate, 15-20 parts of potassium sulfate, and 130-140 parts of water. The invention further provides the an anti-glare glass preparation method, which comprises: (1) placing a glass in a frosting liquid; and (2) introducing a gas into the frosting liquid, and carry out a reaction. According to the present invention, the anti-glare glass prepared by using the frosting liquid through the preparation method has advantages of high light transmittance, highgloss, fine surface particles, uniform particle distribution and the like.

The invention discloses a fluorescent probe for dopamine determination. The fluorescent probe for the dopamine determination is characterized in that with L-arginine as a carbon source, one-step synthesis of carbon quantum dots with strong fluorescence emission is achieved through a hydrothermal method; the carbon quantum dots are characterized by such things as ultraviolet absorption spectrum (UV), fluorescence spectrum (PL), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), and fluorescent properties of the synthetic carbon quantum dots and the fact that the surface of the same contains a large number of functional groups such as hydroxyl groups and carbonyl groups are confirmed; according to the fluorescence quenching effect of dopamine on C-dots(carbon dots), the C-dots are used as a fluorescent probe for detecting the dopamine, and experimental conditions such as pH (hydrogen ion concentration), carbon point usage, reaction temperature andtime are optimized; a quantitative detection method for the dopamine is established under the optimal detection conditions, and the detection limit is as low as 93 nanometers, which proves that the method can be used for sensitive detection of dopamine in actual samples.

The invention discloses a polyaniline / zinc oxide nano composite resistor type material sensor and a preparation method thereof. The sensor comprises a ceramic substrate, an interdigital gold electrode and a gas-sensing material which are arranged in sequence, wherein the gas-sensing material is formed by compositing nanoscale lamellar zinc oxide and nano polyaniline particles; due to large specific surface area caused by nanoscale of the material, the adsorption site of the sensitive material and gas is increased and more channels are provided, so as to promote the adsorption and diffusion of the detection gas in the gas sensor. Particularly, in the preparation process of the sensor, only water is used as a solvent, organic solvents or other additives do not need to be added to participate in reaction, thus being green and safe and having no environment pollution. The reaction temperature is relatively low, high temperature firing is not needed, energy can be saved, and the preparation method has the prominent characteristic of environment friendliness. The method for preparing the gas sensor, provided by the invention, is safe and efficient, and is simple in process and low in cost, thus being suitable for batch production.

The invention discloses nano ferric hydroxide and a preparation method thereof. The shape of nano ferric hydroxide is a nano-sheet cluster, wherein the cluster diameter of the nano-sheet cluster is between 400 and 500nm, and the sheet length of nano-sheets forming the nano-sheet cluster is between 200 and 250nm, and the sheet width is between 20 and 25nm, and the sheet thickness is between 2 and 5nm; the nano-sheet cluster is formed by orthorhombic system alpha-ferric hydroxide, and the specific surface area of the nitrogen adsorption and desorption representation is between 100 and 105m<2> / g. The method comprises the following steps of: mixing ethylene glycol and deionized water, and performing ultrasonic to prepare ethylene glycol aqueous solution; respectively adding ferrous sulfate into the ethylene glycol aqueous solution, and performing ultrasonic to obtain ferrous sulfate mixed solution; adding urea into ethylene glycol aqueous solution, and performing ultrasonic to obtain urea mixed solution; injecting the urea mixed solution into the stirring ferrous sulfate mixed solution at a speed of 0.8-1.2ml / min according to a volume ratio of (0.8-1.2):3 to prepare a reaction solution; and injecting air into the reaction solution at a speed of 2.5- 3.5ml / min to prepare the target product. The nano ferric hydroxide can be widely applied to adsorption and photocatalytic decomposition of organic matters.

The invention provides a method for preparing sulbenicillin disodium. The method comprises the following steps of: preparing alpha-sulfophenylacetyl chloride from alpha-sulfophenylacetic acid; reacting the alpha-sulfophenylacetyl chloride with 6-aminopenicillanic acid (APA) in the mixed solvents of water, ethanol and tetrahydro-2-methylfuran under the condition of the pH value of 5.6 to 7.0 and the temperature of 15 to 25 DEG C for 20 to 40 minutes to obtain crude sulbenicillin disodium; and obtaining the aqueous solution of the sulbenicillin disodium by post treatment and then cooling and drying the aqueous solution of the sulbenicillin disodium to obtain the final product, namely the sulbenicillin disodium. The method has the advantages of reducing energy consumption and saving production cost along with simple process, mild reaction condition and high yield.

The invention relates to a method for preparing and purifying watermelon ketone. According to the method, 4-methylcatechol and 1,3-dichloroacetone are used as raw materials to prepare a watermelon ketone rough product, and the watermelon ketoxime with the high purity is obtained by carrying out oximation, crystallization and purification on the watermelon ketone rough product; and then, the watermelon ketone with high purity is obtained by carrying out oxime removing on the watermelon ketone through oxidization or reduction or hydrolysis. The method disclosed by the invention has the advantages of good selectivity, high yield, wide raw material source, low price, and reasonable and feasible process design.

The invention discloses a method for preparing small-particle-size cerium-activated yttrium aluminum garnet (YAG) florescent powder. According to the method, first, in fused salt, a wrapping structure of nanometer yttrium oxide (cerium oxide) @ aluminum oxide particles is obtained through controlled synthesis, then the aggregate of small-particle YAG florescent powder particles is generated through reaction in high-temperature fused salt, and finally the small-particle-size YAG: Ce florescent powder is obtained through weak ball milling. It is avoided that in the reaction process, the aluminum oxide particles and intermediate-phase particles abnormally grow, and while the high crystallinity of the particles is kept, final YAG is effectively controlled; the particle size of the Ce florescent powder has important significance for improving light-color quality of white-light LEDs, lowering the complexity of a white-light LED packaging technology and increasing the yield.

The invention discloses a low-energy-consumption preparation method for black phosphorus single crystals. The method comprises the following steps that rough black phosphorus powder is used as a phosphorus raw material and subjected to a heating reaction with metal simple substance tin and mineralizer stannic iodide under the vacuum condition, and through programmed cooling, the black phosphorus single crystals with larger size and higher purity are obtained. According to the method, required equipment is simple, the reaction temperature is low, the obtained black phosphorus single crystals are good in crystal form, the energy consumption can be obviously lowered, and the method helps to achieve industrial large-scale preparation of the black phosphorus single crystals.

The invention discloses a method of preparing carboxymethylcellulose by use of manioc waste. The method mainly comprises the following craft processes: firstly, continuously stirring 10g of dried manioc waste so as to enable the dried manioc waste to be dispersed to 50g of deionized water; then, adding 0.823-2.47g of sodium hydroxide and soaking for 6 hours at a normal temperature; then, alkalizing for 1.5 hours under a water bath condition of 30 DEG C; heating to 75 DEG C and then adding 2.40-3.595g of sodium chloroacetate; reacting for 1 hour, taking out and drying; smashing and grinding, and then repeating the steps above; repeating the reaction for three times to obtain the carboxymethylcellulose with the degree of substitution within 0.20-1.19.

The invention relates to a preparation method of an orthorhombic crystal system black phosphorus single crystal. The preparation method comprises the following steps: mixing phosphorus raw materials, metallic indium and stannic iodide; putting in a reactor; tightly sealing; preparing black phosphorus by improving and reducing the temperature through optimized procedures. The obtained black phosphorus is good in crystallization property and high in purity; in addition, the catalyst can be repeatedly used; a preparation process is low in requirement on equipment and easy for realization, and provides great convenience for subsequent application and development of the black phosphorus.

The invention relates to a blood purification adsorbent and a preparation method thereof. The blood purification adsorbent comprises polystyrene resin and at least one mixed charge polymer in covalent coupling with the polystyrene resin, wherein the mixed charge polymer has an enveloping function on the polystyrene resin and comprises multiple repetitive units. The preparation method mainly comprises a polymer suspension step, an RAFT (reversible addition-fragmentation transfer) polymerization step, a reduction step and a coupling grafting step. According to the blood purification adsorbent and the preparation method thereof, the mixed charge amphoteric polymer is utilized to envelop the polystyrene resin, so that the polystyrene adsorbent resin surface has excellent hydrophilic performance, and the efficient blood compatibility of the adsorbent resin is achieved.

The invention provides a method of cellulose immobilized cis epoxy succinic acid hydrolase. The method comprises the following steps: fusing gene coding cis epoxy succinic acid hydrolase and carbohydrate binding module CMB30, efficiently expressing the fused gene in Escherichia coli, and then carrying out purification and immobilization on fused enzyme in crude enzyme liquid by adopting the cellulose. The invention also provides a method for catalyzing and hydrolyzing epoxy succinic acid to convert into L-tartaric acid or D-tartaric acid by adopting the cellulose immobilized cis epoxy succinic acid hydrolase as biocatalyst. The method has the beneficial effects that: not only is the stability of enzyme obviously improved, but also the cellulose used as purified and fixed substrate is low in price and easy to get by adopting the cellulose immobilized cis epoxy succinic acid hydrolase, and has excellent economic prospect. The method for preparing tartaric acid by adopting the cellulose immobilized cis epoxy succinic acid hydrolase has the advantages of reaction specificity, high product purity, high reaction efficiency and the like.

The invention discloses a synthetic method of 1,1,1,3,3-perfluoropropane (HFC-245fa). The method comprises the following step of: preparing the HFC-245fa by carrying out two-step vapor phase catalytic fluorination reaction to 1,1,1,3,3-pentachloropropane (HCC-240) and anhydrous hydrogen fluoride under the action of a chromium-based catalyst, wherein the product containing HCFC-1233zd and HFC-1234ze is acquired through a first-step reaction, then the product acquired through the first-step reaction is directly led to react in a second reactor so as to acquire a product containing HFC-245fa, and then the target product HFC-245fa is acquired after impurities are separated. The synthetic method of the 1,1,1,3,3-perfluoropropane (HFC-245fa) has the advantages of simple process, low energy consumption and low equipment investment.

The invention relates to a preparation method of an orthorhombic crystal system black phosphorus single crystal. The preparation method comprises the following specific steps: mixing a ternary phosphorus-tin-iodine catalyst and red phosphorus; putting a mixture into a reactor; after discharging air and sealing, preparing black phosphorus through programmed temperature rising and temperature reduction. Mass production of the ternary phosphorus-tin-iodine catalyst can be realized in advance; the black phosphorus obtained by the catalyst has good crystallization performance and high purity; the yield reaches 99 percent and the catalyst can be repeatedly utilized; extremely great convenience is provide for subsequent application and development of the black phosphorus.

The invention discloses a method for preparing water soluble chitosan oligosaccharide from squid sheath. The method is characterized by comprising the following steps of: crushing the squid sheath, adding 6 to 9 percent HCl solution, ensuring that a material / solution (w / v) ratio is 1:14, decalcifying for 20 to 60 minutes, washing to neutrality, adding 10 percent NaOH solution, ensuring that a material / solution (w / v) ratio is 1:10, removing protein, filtering and washing to neutrality, and drying to obtain beta-chitin; adding 30 to 50 percent NaOH solution into the beta-chitin, ensuring that a material / solution ratio (w / v) is 1:10, performing ultrasonic bath reaction at the temperature of between 70 and 100DEG C for 2 to 4 hours, filtering, washing to neutrality, and drying to obtain chitosan; and adding 3 to 12 percent H2O2 into the chitosan, ensuring that a material / solution ratio (m / v) is 1:15-1:25, reacting at the temperature of between 45 and 75DEG C for 2 to 5 hours in the assistance of ultrasonic waves, concentrating filtrate, adding ethanol in an amount which is 3 to 5 times volume of the concentrated filtrate, precipitating and filtering a product, and drying to obtain the chitosan oligosaccharide, wherein the chitosan oligosaccharide has the molecular weight of less than 1*10<4>Da, the DPPH free radical removing capacity (EC50) of between 0.3 and 1.3mg / mL and the cholic acid combining capacity of between 20.47 and 63.53mg / g. The invention provides technical support for comprehensively utilizing leftovers, namely the squid sheath in aquatic product processing and industrially producing the water soluble chitosan oligosaccharide.

One kind of soften some production methods of offices and rosins high, including get together, washing and distillation process, and refined, film-making, pack etc.. Law this for raw materials, the petrol is solvents, drip and add the strong sulphuric acid under cooling the environment with rosin, carry on cation polyreaction, get and gather the body resinic acid fat liquid two times, through clarifying, separation: Worth 6.5 to pH, get and wash washing with the hot water into the tower with the solid carbonic acid ammonium neutralization material liquid, fat liquid reach heat up in a steamer tower again, steam appear petrol, is it get rosins together to produce to pay attention to divide, and separate rosin / retinol mixture, mixture divide into person who congeal, win fractional distillation rosin or soften some 861 resin of 78 deg.C; And the one that isolate gets rosins together except that the drum is packed directly, can enter the refined cauldron, it is single to add the suitable resinic acid, the ones that heated and got exquisity high and softenned a bit got rosing together.

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a nickel sulfide nanosheet / carbon quantum dot composite material and a preparation method and application thereof. The composite material is prepared by the following steps: ultrasonically dispersing carbon quantum dots in an aqueous solution; adding soluble nickel salt and hexamethylenetetramine to obtain a carbon quantum dot / nickel hydroxide mixture precursor solution, enabling the precursor solution to grow on the surface of the foamed nickel at the temperature of 90-120 DEG C, mixing the carbon quantum dot / nickel hydroxide mixture with the sodium sulfide solution, performing hydrothermal reaction at the temperature of 100-140 DEG C, washing with water, and drying to obtain the composite material. The preparation method has the characteristics of simple preparation process, stable process, easiness in operation, low cost, no pollution and the like. The nickel sulfide nanosheet / carbon quantum dot composite material has a unique honeycomb nanosheet structure, which is beneficial to effective infiltration of an electrolyte, can enable the electrolyte to be in full contact with active substances, improves the electrochemical performance of the material, and can be used as a supercapacitor electrode material.

The invention relates to a preparation method of a biomass-based phenolic resin. According to the invention, a biomass monomer 2,5-diformyl furan and phenol are adopted as raw materials; under the catalyzing of alkali, a temperature of 30-200 DEG C, and nitrogen gas protection, the raw materials are subjected to a addition and condensation reactions for 1-10h; and water and other impurities in the reaction system are removed with a vacuum distillation method, such that a novel phenolic resin high-quality product with 2,5-diformyl furan for substituting formaldehyde is obtained. With the method, the prepared product has the advantages of high yield, easy separation, and environment-friendliness. The method has good application prospect.

The invention discloses a difunctional self-healing polymer electrolyte. The difunctional self-healing polymer electrolyte comprises polyethylene glycol with double bonds, a cross-linking agent with adisulfide bond, an initiator and a chain transfer reagent, wherein the cross-linking agent with the disulfide bond has the disulfide bond and the hydrogen bond at the same time. The invention also provides a preparation method of the difunctional self-healing polymer electrolyte. The method comprises the following steps: S1, reacting a monomer with double bonds with a monomer with disulfide bondsin a first solution to obtain the cross-linking agent with the disulfide bond; S2, dissolving the cross-linking agent with the disulfide bond and polyethylene glycol with the double bonds in a secondsolvent, adding an initiator and a chain transfer reagent, performing deoxidizing, and heating for reaction to obtain a PEG-SS copolymer; and S3, dissolving the PEG-SS copolymer in a third solvent, adding a lithium salt for uniformly stirring, pouring the mixed solution into a film, and drying the film to obtain the difunctional self-healing polymer electrolyte. The cross-linking agent with the disulfide bond has the disulfide bond and the hydrogen bond at the same time, and self-healing of the electrolyte material at the room temperature is achieved.

The invention discloses a method for preparing GBL (Gamma-Butyrolactone) by taking furfural as a raw material. The method comprises two steps of oxidizing the furfural to prepare 2(5H)-furanone and hydrogenating the 2(5H)-furanone to prepare the GBL, wherein the 2(5H)-furanone can be synthesized by the furfural by taking homogeneous-phase acid or solid acid as a catalyst and taking hydrogen peroxide as an oxidant under the conditions of mild temperature and pressure. The 2(5H)-furanone is further selectively hydrogenated to obtain the GBL under the effect of a metal catalyst in a hydrogen atmosphere. The GBL can be generated by commonly hydrogenating the 2(5H)-furanone serving as a main product and C4 binary acid serving as a byproduct of the oxidation of the furfural in situ under appropriate conditions. According to the method, high-efficiency conversion from the furfural serving as a biomass raw material to the GBL serving as a fine chemical product is realized; the method has a great application prospect.

The invention relates to a thin micro reforming apparatus used in a fuel cell system. The reforming apparatus includes a substrate having a flow path formed therein, and a fuel inlet portion for introducing fuel to the flow path of the substrate. The fuel inlet portion allows the fuel to flow through a predetermined length of a channel, thereby preheating the fuel. The reforming apparatus also includes an evaporator having a flow path for gasifying liquid fuel, and a reformer for reforming fuel into hydrogen gas via heat absorption reaction. The reforming apparatus further includes a CO remover for removing CO gas contained in the hydrogen gas via heat generation reaction, and a cover for sealing the flow paths of the substrate. The channel of the fuel inlet portion surrounds the evaporator, reformer and CO remover, thereby facilitating insulation at the sides of the reforming apparatus and increasing heat efficiency.

The invention relates to a carbon / carbon composite material and a preparation method thereof. The preparation method comprises the following steps: dissolving or dispersing a biomass carbon source in water to prepare a carbon source water solution or suspension; adding the carbon source water solution or suspension into a reaction kettle, putting a heating tube sheathed with a carbon fiber prefabricated body into a reaction kettle, and heating to perform hydrothermal carbonization reaction; and pouring out the liquid in the reaction kettle, adding the carbon source water solution or suspension into the reaction kettle, and heating to perform hydrothermal carbonization reaction, thereby obtaining the carbon / carbon composite material. The invention provides a novel thermal-gradient hydrothermal method for preparing a carbon / carbon composite material. On the basis of the characteristics of renewable hydrothermal carbonization raw material, low synthesis temperature and environment friendliness, the method also has the characteristic of high densification efficiency in the thermal-gradient deposition technique.

The invention discloses an airlift sonochemical reactor, which is characterized in that: a vertical reacting cylinder is arranged; an ozone distributor with a gas outlet being upwards is arranged on the bottom of the reacting cylinder, a water outlet of a waste liquid tubing guide is close to the upper of the distributor, and keeps flow direction of water outlet being symmetrical with flow direction of ozone; energy transducers are arranged on the internal side wall of the reacting cylinder in an array manner, and a low frequency energy transducer and a high frequency energy transducer in a same horizontal plane are oppositely arranged on a same diameter line to form a energy transducer pair; and the number of the energy transducer pairs on a same horizontal plane is odd number, and the energy transducers uniformly distributed on a same circumference are arranged in an interval arrange manner of a low frequency energy transducer and a high frequency energy transducer. The airlift sonochemical reactor of the invention can high-efficiency utilize the synergism of ultrasonic wave and ozone, promotes acoustic cavitation effect, and can be used for treating industrial wastewater which is difficult to degrade.

The invention provides a microwave hydrothermal synthesizing method for carbon nanotube / LiFePO4 lithium ion battery anode material. The method comprises the following steps of respectively adding LiOH*H2O or Li2CO3 and NH4H2PO4 and FeC2O4*2H2O in deionized water, obtaining solution A; adding citric acid into the solution A, obtaining solution B; dispersing carbon nanotube (CNT) in concentrated HNO3 for soaking, and ultrasonic washing the CNT, obtaining purified CNT; adding the purified CNT in the solution B, obtaining reaction liquid; pouring the reaction liquid in a microwave hydrothermal kettle, sealing the microwave hydrothermal kettle, placing the sealed microwave hydrothermal kettle in a temperature and pressure doubly-controlled microwave hydrothermal reaction instrument for reacting, after the reaction is finished, naturally cooling the reactant to a room temperature, performing centrifugal separation for the reactant, washing the reactant by deionized water and absolute ethyl alcohol respectively, and then drying the reactant in a vacuum drying box, obtaining the carbon nanotube / LiFePO4 lithium ion battery anode material. According to the method provided by the invention, the microwave method and hydrothermal method are combined, so that the preparation of LiFePO4 lithium ion compound battery power body can be finished in the liquid phase at one step, the operation is simple, subsequent annealing heat treatment is not required, the reaction temperature is low, the reaction period is short, and the energy consumption is small, and moreover, the preparation cost of apower body can be reduced.

The method of promoting olefin polymerization uses a nanoparticle filler to increase the activity of a metallocene catalyst for in situ polymerization of polyolefins. The filler may be nanoparticles of manganese, or nanoparticles of manganese-doped titanium dioxide. The method includes the steps of (a) mixing a metallocene catalyst, e.g., zirconocene dichloride, with nanoparticles of the filler in an organic solvent, e.g., toluene, in a reactor to form a reaction mixture; (b) immersing the reactor in a temperature bath for a period of time sufficient to bring the mixture to an optimal polymerization reaction temperature; (c) adding monomer to the mixture in the reactor; (d) adding methylaluminoxane (MAO) as a co-catalyst to the reaction mixture to initiate polymerization; and (e) quenching the polymerization, e.g., by adding methanol containing 5% hydrochloric acid by volume to the reactor.

The invention discloses a Vibrio parahaemolyticus isothermal amplification detection kit and detection method. The kit comprises a DNA (deoxyribonucleic acid) extraction reagent, an isothermal PCR (polymerase chain reaction) amplification reaction solution, a positive control and a negative control. The detection kit has the advantages of high specificity and high sensitivity. The nucleic acid amplification reaction is kept at one constant temperature, the isothermal amplification only takes 35 minutes, the nucleic acid test strip detection result takes 1-2 minutes, and the whole detection process from sample reception to result acquisition only takes 1 hour or so; and the whole reaction process only needs one isothermal apparatus, and thus, is especially suitable for on-site quick detection and elimination of poisoning of marine products and other foods.