58 results about "Radiation chemistry" patented technology

The invention relates to a method for preparing a graphene-based titanium dioxide composite photocatalyst by radiation of electron beams, belonging to the technical fields of radiation chemistry and photocatalyst preparation. The method comprises the following steps: firstly, preparing graphene by the prior art, then adding the graphene powder into a titanium tetrafluoride solution, and dispersingthe graphene powder with ultrasonic waves to obtain a suspension; then putting the suspension in an electron beam generating device to be radiated by a certain dose of electron beams, the irradiationdose of which is 70-280KGy; after sealing, putting the suspension in an oven of 60 DEG C for reaction for 20 hours; and finally, obtaining the graphene-based titanium dioxide composite photocatalystby washing and drying. The inspection proves that the graphene-based titanium dioxide composite photocatalyst prepared by the method of the invention has higher photocatalytic activity. In addition, by inspecting with a transmission electron microscope (TEM), titanium dioxide crystals which are densely and evenly loaded on the graphene matrix can be seen.

The present invention is nano silver preparing process and belongs to the field of nano material preparing technology in radiochemistry. The technological process includes adopting silver nitrate as silver source, isopropanol as oxidant clearer in water solution, hydrophilic suitable for PVA for controlling the crystal kernel growth speed and grain size and electronic accelerator to produce electron beam for irradiation treatment; washing irradiated solution, centrifugal separation and stoving to obtain black nano silver powder. The present invention has simple technological process, short production period, no pollution and high safety, and the prepared nano silver grain is spherical, homogeneous in size and good in dispersivity.

The invention relates to an iron super-micro particle preparation technique, belongs to radiation chemical nanometer material production technique. The technique of the invention is that: nanometer material preparation: obtain iron hydroxide colloid solution by using iron sulfate as raw material and ammonia liquor as precipitant; control the crystal core accumulating speed and the particle size by hydrophilic surface-activator polyvinyl alcohol with isopropyl alcohol as free radical scavenger and in radiation chemistry principles; develop the radiation chemical reaction by the bunch of electrons generated by industrial electron accelerator; the radiated solution produces nanometer triple iron quadoxide which deoxidated with high purity hydrogen to obtain nanometer iron powder. The advantages of the invention are that: simple technical processes, short production cycle, non-pollution, the obtained particles are of uniform diameter and finely divided. The nanometer iron produced in above ways is of higher satiating hard magnetism and coercive force which is applicable on high intensity magnetic recording material..

A light-attenuating composition and method of using it are described. The light-attenuating composition may be selectively applied to a radiant energy sensitive material on the substrate. Actinic radiation applied to the composite chemically changes portions of the radiant energy sensitive material not covered by the light-attenuating composition. The light-attenuating composition attenuates light in at least the UV range and is water-soluble or water-dispersible.

The invention provides a method for preparing nano zinc oxide by using liquid diaphragm discharge plasma. The method produces the nano zinc oxide by using zinc plates as an anode and a cathode and Na2SO4 solution as electrolyte, irradiating the zinc plate of the anode with liquid diaphragm discharge plasma, and electrochemically sacrificing the zinc plate of the anode. By using the principle of radiation chemistry, transient high temperature and local high pressure are produced in liquid with light and shock wave, and high-activity particles are also produced to initiate chemical reactions, enabling the reactions such as oxidation, reduction, decomposition and hydrolysis to prepare nanoparticles; the nano zinc oxide synthesized herein has good dispersity, low aggregating degree and uniform particle size distribution and has a promising application prospect in terms of catalysis, optics, magnetics, mechanics and the like; products are easy to separate, high in purity and free of pollution; in addition, the method has the advantages of mild conditions, controllable process, simple equipment, good operation convenience, low cost and the like and is applicable to industrial production.

The invention provides a radiative reduction and curing method for liquid polycarbosilane, and belongs to the field of macromolecules and the field of inorganic non-metallic ceramics. An electron beamradiation technology is applied to reduction and curing of liquid polycarbosilane, liquid polycarbosilane containing chloromethyl groups is subjected to a radiation chemical reaction under radiationof electron beams, and cross-linking curing of liquid polycarbosilane is realized while chlorine atoms are reduced by hydrogen. The method can be directly applied to a liquid polycarbosilane dipping pyrolysis method for preparing a silicon carbide ceramic material, unsaturated bonds are not required to be introduced into liquid polycarbensilane molecular chains, or a cross-linking agent, a catalyst and an initiating agent are added to a liquid polycarbensilane precursor, curing of liquid polycarbensilane can be realized, so that not only is change of a silicon-carbon ratio of the polymer precursor in a curing process avoided, but also introduction of heteroatoms such as platinum, oxygen and nitrogen are avoided, and the method has the advantages of being simple to operate, easy to controland capable of realizing large-scale production and the like.

The invention relates to a method for preparing a composite photocatalyst of a titanium oxide/multi-wall carbon nano pipe by electron-beam irradiation, which belongs to the technical fields of radiation chemistry and the preparation technique of the photocatalyst. The method mainly comprises the following preparation processes: adding a multi-wall carbon nano pipe (MWCNTs) into a titanium fluoride(TiF4) solution, dispersing by ultrasonic and mixing fully and evenly, wherein the mass ratio of the multi-wall carbon nano pipe (MWCNTs) and the titanium fluoride (TiF4), i.e. the MWCNTs:the TiF4 isequal to 0.05-0.15; then, putting the solution in an irradiation area under an electron accelerator and carrying out irradiation processing, wherein the irradiation dose is 280-560KYy; afterwards, moving to the other container, putting into a baking oven after sealing a sealed opening, and reacting for 20 hours at the temperature of 60 DEG C; and afterwards, washing a product, drying and finallypreparing the composite photocatalyst of the titanium oxide/multi-wall carbon nano pipe. The composite photocatalyst obtained by the method has favorable photocatalysis property and better photocatalysis effect.

This invention involves the making method of a kind of temperature-controled adsorption fibre. It belongs to radiate chemistry engineering technology field. The invention mainly uses rediate graft and advance graft. The rediate graft is put the polypropylene fibre in the graft liquid, and then via the transmission equipment put the feedback into the radiate room to radiate.

The present invention is nano copper preparing process and belongs to the field of nano material preparing technology in radiochemistry. The technological process includes adopting copper sulfate as copper source, isopropanol as oxidant clearer in water solution, hydrophilic suitable for PVA for controlling the crystal kernel growth speed and grain size and electronic accelerator to produce electron beam for irradiation treatment; washing irradiated solution, centrifugal separation and stoving to obtain claret nano copper powder. The present invention has simple technological process, short production period, no pollution and high safety.

The invention relates and belongs to the crossed fields of nanocomposites and radiation chemistry, in particular to an antibacterial wood plastic composite preparation method through gamma rays and aims to solve the problem of poor antibacterial performance of the existing wood plastic composite. The method includes, 1, dissolving AgNO3 into deionized water, adding ammonia after dissolving until the produced precipitate disappears completely, adding wood flour and isopropanol for ultrasonic dispersion, and obtaining wood flour mixed liquid; 2, inputting nitrogen gas for 1 hour, irradiating through 60 Co-gamma rays, and obtaining the wood flour loading nano sliver grains; 3, performing centrifugating separation, washing, and obtaining modified wood flour after drying; 4, mixing the modified wood powder, maleic anhydride-grafted polypropylene and antioxidant, and obtaining the antibacterial wood plastic composite. The disadvantages of impure product due to adoption of antibacterial agent and reducing agent and low stability are avoided.

The invention belongs to the technical fields of radiation chemistry and graphene nano-materials, and provides a synthesis method of sulfur-doped reduced graphene used for adsorbing organic pollutants. The method comprises the following steps: preparing an ethanol solution of graphene oxide, with the concentration of 0.5-2 mg/mL, adding polyethylene glycol 1500 to make the concentration be 0.075-0.15 mg/L, carrying out ultrasonic dispersion for 30-60 min to dissolve water-soluble sulfides in the obtained graphene oxide suspension in order to make a mass concentration ratio of sulfur to graphene oxide be 1:1 to 1:5, adding 20-100 mL of isopropanol, stirring the obtained solution for 30-60 min, adding 4-15 mL of an ammonia water solution, and irradiating the obtained solution with electron beams at an irradiating dose of 70-350 kGy; and sequentially cleaning the obtained material with ethanol and distilled water after the irradiation is finished, centrifuging the cleaned material, repeating the cleaning and centrifuging steps, and drying the obtained solid to obtain a dried solid which is the sulfur-doped reduced graphene. The technical problems of complex preparation technology, use of toxic and harmful reagents, high reaction temperature and poor adsorption performance in the prior art are solved.

The invention discloses a radiation grafting compatibilizer modified PET alloy material, a special compatibilizer thereof and a preparation method thereof. The graft copolymer consists of a main chainformed by the structural units shown by formula I and a branched chain formed by the structural units shown by formula II; -CH2- in the formula II is connected with -CH2- in the formula I by chemicalbond; and the grafting rate is 0.09-0.18%. The preparation method of the graft copolymer comprises the steps: in inert atmosphere, evenly mixing PET, acrylic acid and polymerization inhibitor and then irradiating to have graft copolymerization reaction, and finally obtaining the graft copolymer; and the irradiation dose rate is 0.8-1.5kGy/h, and the absorbed dose is 20-30kGy. The PET alloy material comprises the components based on parts by weight: 68-85 parts of the PET, 15-20 parts of toughening agent, 0.1-0.2 part of antioxidant and 3-12 parts of the graft copolymer. The PET alloy materialis prepared by evenly mixing the components and melt extrusion. The invention not only expands the application of radiation chemistry in the field of preparing PET engineering material, but also provides the PET alloy material with excellent performance, thus having wide application value.

The invention relates to atomic energy technology field, radiation machining field and more specificly a additive for reducing radiation odor. The invention is to aim at the problem of producing irritable irradiation odor when absorbed dosage is higher than 5kGy, to produce additive for decreasing radiation odor according to radiation chemistry principle. The inventive additive is 0.1%Vc+0.1%Ve aqueous solution. The additive is sprayed to food surface for making it become moist , spray volume being not over the food water content. It can decrease irradiation odor production under absorbed dose of 5-8kGy, irradiation dosage unevenness less than 1.5. The concentration of Vc and Ve use is in 0.05%-0.2%, which has same effect. The invention is suitable for instant food such as cooked meat, fresh sea product.

The invention provides a process for processing metal powder through a radiation chemical method. The inveniton adopts the technical scheme that based on the reduction reaction of metal ions, metal and alloy or metal oxide nanometer particles are generated through the strong reduction action of hydrated electrons on the metal ions in a metal salt solution under the radiation of X rays or gamma rays. The process is characterized in that hydrated electrons and H. free radicals having extremely high reduction capability are naturally generated through the ionizing radiation of a water solution system without adding a reductant into the system; the preparing process is simple, the cycle is short, and the radiation dosage is controllable; product particle sizes are easy to control, and powder of which the average particle size is about 10 nm can be obtained in general; the reduction rate of rare metal can reach 95% or above, and the reduction rate of active metal can reach 70% or above; the preparing cost is low. The process for processing the metal powder through the radiation chemical method has the characteristics of being mild in conditions, short in cycle, high in yield, wide in the range of metal raw materials, is suitable for large-scale massive continuous production and has a wide prospect.

The invention discloses an optical physical unclonable function device which comprises a substrate. A chaos metasurface is located on the surface of one side of the substrate; the chaotic metasurface is generated by bombarding and etching a double-layer thin film arranged on the substrate; and quantum dots are compounded on the chaotic metasurface. A large-area chaos metasurface is generated through radiation chemical reaction generated in the process of bombardment etching of an ion beam on a double-layer nano film, nodes at different positions of a chaos nano net formed by the chaos metasurface show different branch modes, and ridge ends and branches similar to fingerprint features are shown, and the grids of the chaotic metasurface have randomness. The light-emitting behavior of the quantum dots is cut through the chaos metasurface, and the fluorescence speckles and the service life of the quantum dots are sensitive to the position of the metasurface through the surface plasmon effect, so that the optical physical unclonable function device can emit optical signals which cannot be accurately copied. The invention also provides a preparation method which also has the above beneficial effects.

The invention, belonging to the field of radiation chemistry and nuclear technology, discloses a gamma-ray radiochromic solution, comprising the following ingredients: 0.02-1 weight portions of dye, 0-0.5 weight portions of photoinitiator, 0-0.5 weight portions of anti-oxidant, 0-10 weight portions of organic solvent, and the rest sovlent consisting of 100 weight portions of distilled water. The invention further discloses a radiation dosemeter prepared by using the gamma-ray radiochromic solution, comprises a radiochromic device and a colorimetric device. The gamma-ray radiochromic solution and the radiation dosemeter are suitable for large scale industrial irradiation. According to the invention, a test result of the radiation dosemeter is timely and intuitionistic, the radiation dosemeter can guide production on site to guarantee the irradiation quality, the radiation dosemeter can be placed in any position and even in the package of an object being irradiated to prevent pollution; the radiation dosemeter is fit for any object being irradiated, and even can be placed in a liquid or cream object being irradiated; the gamma-ray radiochromic solution is stable under the conditions of room temperature and room light illumination, and has equivalence that is close to the equivalence of the object being irradiated; and the gamma-ray radiochromic solution has the advantages of simple formula and preparation, easy obtainment of raw materials, and low cost, and the precision of the gamma-ray radiochromic solution is suitable for large scale irradiation processing.

The invention relates to a capric acid gel solid-solid phase change material and a method thereof, and in particular to a capric acid system which is doped with a multi-allyl acid esters radiation sensitizer by irradiation of high-energy electron beams generated by an electron accelerator. The molecules of the multi-allyl acid esters radiation sensitizer and the molecules of capric acid undergo grafting and cross-linking reaction to produce a hydrophobic capric acid gel material which has a solid-solid phase change property. The invention belongs to the technical field of radiation chemistry and polymer material processing.