33results about How to "Achieve reversible conversion" patented technology

Belonging to the field of nano-material synthesis, the invention discloses a preparation method of a nano-zinc oxide cellulose sponge material. The method includes: adopting hemp stem fiber as the raw material, using a NaOH solution to swell the fiber, then using saturated steam pressurization to split cellulose into smaller fibers, then reacting N, N'-carbonyldiimidazole with cellulose to generate high activity cellulose, adding a KH-550 silane coupling agent to graft nano-zinc oxide to a high activity cellulose surface, then using absorbent cotton as the reinforcing fiber, taking sodium sulfate as the pore-forming agent, and using a NaOH/thiourea solution as the solvent, and carrying out die molding to prepare a nano-zinc oxide cellulose sponge material under low temperature and dry conditions. The obtained nano-zinc oxide cellulose sponge material has a sponge porous structure, the cellulose composing the sponge structure is easily degradable and does not cause secondary pollution, also the complex nano-zinc oxide bulge structure on the surface can realize reversible conversion of surface super-hydrophobicity and super-hydrophilicity, thus realizing adsorption and removal of oil.

The invention provides a preparation method of super-molecule metal gel and belongs to the field of functional materials. The super-molecule metal gel is obtained by a complex formed by complexing a benzimidazole carboxylic acid derivative as well as metallic lead, cadmium, copper and zinc in H2O/CH3OH, H2O/DMSO, H2O/CH3CN, H2O/CHC13 or H2O/DMF systems under the ultrasonic condition. FT-IR spectrum and X-ray diffraction results show that the gel prepared according to the invention is formed by constraining solvent micromolecules through the coordination complex formed by the benzimidazole carboxylic acid derivative and the metallic ions; and as the gel shows the conversion nature of reversible gel-sol under the acid-base control, the gel can be used for making a controllable molecular switch.

The invention discloses a magnesium base alloy modulated thin film and a preparation method and application thereof. The magnesium base alloy modulated thin film comprises a magnesium base alloy modulated layer, a catalyst layer and a polymer layer which are sequentially arranged; and elemental composition of the magnesium base alloy modulated layer is MgxM1-x, wherein x is greater than 0.5 and less than 1, and M is at least one of Gd, Ti, Ni, Mn, Fe, Co, Y, Nb, Ru, Zr, Ca, Ba, La, and Sm. The magnesium base alloy modulated thin film has the advantages of simple preparation process, low cost,wider practicality range and the like, a hydrogen sensor made of the magnesium base alloy modulated thin film is high in response speed and high in sensitivity, is not required to be warmed and forced, potential safety hazards do not exist, and recycling further can be achieved. In addition, the thin film optical performance change further can be realized by adjusting technological parameters, a hydrogen induced discoloration thin film with a larger optical conversion interval is obtained, and the magnesium base alloy modulated thin film has larger application value in other fields as well.

The invention discloses anti-cracking recycled concrete and a preparation method thereof. During use of the concrete, if cracks appear on the surface of the concrete, polyurethane polymer cross-linkednanotubes in modified nanotubes are broken, disulfide bonds and hot hydrogen bonds can be matched with each other through high temperature of the environment, and self-repairing of the cracks is achieved; meanwhile, under the status, the high temperature enables the form of the nanotube with temperature responsiveness to be changed into a vesicle shape and the volume to be shrunk, so that component movement occurs in the concrete, the vesicle shape is recovered into the nanotube form after the temperature is reduced, and the nanotube can be connected with the nanotube with non-temperature responsiveness again to cooperate with the polyurethane polymer cross-linked nanotube to jointly carry out self-repairing of cracks. The invention discloses the anti-cracking recycled concrete and a preparation method thereof, wherein the anti-cracking recycled concrete is reasonable in process design and proper in component proportion, and the prepared concrete not only has excellent mechanical properties and anti-cracking performance, but also can self-repair cracks.

The invention discloses a circular polarization luminescent material with intelligent response multicolor conversion and a preparation method thereof. The intelligent response multicolor conversion circular polarization luminescent material has a structure shown as a formula I, cholesterol chiral groups are introduced into the structure, molecules are self-assembled to form spirally stacked nanotubes, yellow circular polarization luminescence is shown, and the asymmetry factor |g<lum>| is as high as 0.016. The fluorescence color and the circular polarization intensity of the circular polarization luminescent material have intelligent responsiveness to various external stimuli, including external force, temperature, illumination and organic solvent stimuli, and the circular polarization luminescent material is sensitive in response, high in contrast ratio and good in reversibility. The preparation method of the intelligent response multicolor conversion circular polarization luminescentmaterial is simple and efficient, and can be applied to the fields of force-induced discoloration, thermochromism, photochromism, steam-induced discoloration and other sensing materials, optical storage and display, anti-counterfeiting, circular polarization luminescent materials and the like.

The invention relates to movement equipment with a work-medium-loss-free-type thruster in order to overcome the defects in the prior art and particularly relates to equipment suitable for relying on thrust to complete movement. Current aviation and aerospace flying equipment is restrained by the reductant and oxidant carrying quantities; and human beings are limited and cannot achieve long journeysimilar to the interplanetary crossing grade. The movement equipment with the work-medium-loss-free-type thruster is characterized in that the process connected in sequence through work media and photons for controllable operation to generate thruster thrusting force is put forward; and according to the equipment with the thruster, when the thrusting force is generated, the work media are discharged outwards, the total quantity is balanced by capturing work media in the movement space, and a large quantity of hydrogen oxygen propellants are not relied on to be carried to serve as a unique power source of movement.

The invention discloses a making method of building paint, which comprises the following steps: adopting 7% methyl ester phthalate, 12% triarylmethane lactone, 3% vanadium oxide and 78% water-soluble urea-formaldehyde resin, titanium dioxide and water with the rate of water-soluble urea-formaldehyde resin, titanium dioxide and water at 10%: 50%: 40%; blending the materials evenly; grinding 30min at 500r/min; obtaining the product.

The invention relates to a tertiary amine structure-containing polyarylene sulfide ultrafiltration membrane, a tertiary amine structure-containing polyarylene sulfide nanofiltration membrane and a preparation method thereof, and belongs to the field of high polymer materials. The invention provides a polyarylene sulfide separation membrane. The polyarylene sulfide separation membrane is a tertiaryamine-containing polyarylene sulfide ultrafiltration membrane prepared from tertiary amine-containing polyarylene sulfide resin. The invention provides a novel ultrafiltration separation membrane. The obtained ultrafiltration membrane can be converted into a nanofiltration membrane through acidification treatment, and the obtained nanofiltration membrane can be recovered into an ultrafiltration membrane through deacidification treatment, so that reversible conversion of ultrafiltration-nanofiltration is realized.

The invention discloses preparation and application of multi-wavelength regulated and controlled optical switch fluorescent polymer nanoparticles. Methyl methacrylate (MMA), green optical switch fluorochrome (SP-PDI) and a photochromic compound diaryl ethylene (DTE-BA) are taken as main raw materials by a fluorescence resonance energy transfer principle (FRET) to prepare the multi-wavelength regulated and controlled optical switch fluorescent polymer nanoparticles by using a miniemulsion polymerization method. The nano particles are small in particle size and good in water dispersibility, andcan show the characteristics of rapid and reversible fluorescence switch under the irradiation of two kinds of ultraviolet light and visible light. Compared with an existing optical switch fluorescentpolymer nanoparticles, the obtained optical switch fluorescent polymer nanoparticles have the advantages of multi-layer optical switch capability, low investment cost, simple synthesis route and thelike, are suitable for amplification synthesis and practical production application, and have great application prospects in the technical fields of logic gates, display materials and the like.

The invention provides an electrochromic nonmetallic salt electrolyte composite material, a preparation method and application, and belongs to the field of electrochromic electrolyte material synthesis. The method comprises the following steps: preparing tungsten oxide sol; then preparing amino or substituted amino modified carbon nanodots; and mixing the amino or substituted amino modified carbonnanodots with tungsten oxide sol, and adding a stabilizer to obtain the electrochromic nonmetallic salt electrolyte composite material. The invention also provides the electrochromic nonmetallic saltelectrolyte composite material obtained by the preparation method. The invention also provides an application of the electrochromic nonmetal salt electrolyte composite material in an electrochromic device. The electrochromic device provided by the invention can realize reversible conversion between yellow and green, and enriches the color types of inorganic electrochromic materials.

The invention discloses a preparation method and application of a photoswitch spiropyran-perylene imide compound. By means of the method, the symmetric or asymmetric substituted spiropyran-perylene imide compound is synthesized and introduced into a polymer nanoparticle system through a one-step fine emulsion polymerization method to prepare a photoswitch fluorescent polymer nanoparticle. The nanoparticle can show fluorescent switching performance with high response speed under the irradiation of ultraviolet light and visible light in a solution state or a solid film state. Compared with existing photoswitch fluorescent polymer nanoparticles, the obtained photoswitch fluorescent polymer nanoparticle has the advantages that through connection to an acceptor group in the form of covalent bonds, the usage quantity of acceptors is reduced, the investment cost is low, and the synthesis route is simple. The compound is suitable for amplification synthesis and practical production applicationand has a great application prospect in the technical fields of display materials and the like.

The invention provides a hydrophilic and hydrophobic conversion intelligent surface heat exchange tube and a control system thereof, the inner surface of a base tube is divided into a spacer region and an intelligent surface region in the circumferential direction, an insulating layer I, a conductive layer, a porous layer and an insulating layer II are sequentially constructed in the intelligent surface region from the inner wall of the tube, and finally hydrophobic groups are electrified and sprayed on the insulating layer II. The exterior of the base tube is divided into a plurality of sections at equal intervals, thermocouples are welded to the upper end and the lower end of each section to monitor the temperatures of the upper end and the lower end of the section, the temperatures are fed back to a computer, and the computer adjusts currents of all the channels of the multi-channel direct-current power source to enable charged hydrophobic groups to move. And the inner surface of the pipe is subjected to hydrophilic-hydrophobic conversion in a spatio-temporal level. In the heat exchange process of the heat exchange tube, wettability transformation of the inner surface of the tube can be achieved according to different flow patterns, phase distribution in the tube is regulated and controlled, a multiphase flow structure and heat transfer are coordinated, and the heat transfer effect is improved.

The invention discloses a natural plant enzyme sunscreen cream capable of improving the cell viability and a preparation method thereof. The natural plant enzyme sunscreen cream is prepared from plantenzymes, lattice-modified nano cerium oxide, self-made polyurethane, self-made chitosan, a 15-emulsifier, glycerin and preservative deionized water. According to the natural plant enzyme sunscreen cream and the preparation method thereof, nano cerium dioxide is dispersed into self-made polyurethane resin, a protective film with the adhesion performance can be formed on the surface layer of skin,the protective film adheres to the nano cerium dioxide, the cell viability and ultraviolet absorption are better improved, and positive tetravalent cerium enters cells through the protective film to act; the lattice-modified nano cerium dioxide has higher stability, the condition for forming the protective film through graft copolymerization of the polyurethane and the self-made chitosan is not limited to a wet environment any more, and the formed protective film also has the ultraviolet absorption capacity; and by improving the natural plant enzyme sunscreen cream, the ultraviolet absorptioneffect is enhanced, and the cell viability is improved.