8459 results about "Nanomaterials" patented technology

The invention discloses rubber powder grafted nano material composite modifier modified asphalt, a preparation method thereof and an asphalt mixture, and belongs to the technical field of modified asphalt. The modified asphalt is prepared by modifying a carboxylated nano material grafted with aminated rubber powder. According to the invention, the rubber powder and the nano material are grafted, so that the advantages of the rubber powder and the nano material can be fully played, the high temperature, low temperature, water stability and other properties of asphalt and asphalt mixtures are remarkably improved, and a new solution is provided for high performance and sustainable development of asphalt pavements; therefore, the method has good application prospect and value in the field of road engineering.

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention discloses a SnO2 / SnS2 / AgS nano material with piezoelectric electro-catalytic tooth whitening and sterilizing performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dripping a silver nitrate aqueous solution into a prepared SnO2 / SnS2 nano material aqueous dispersion, carrying out hydro-thermal treatment for 2 hours, centrifuging, washing and drying to obtain a SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nano material; (2) food indigo is adopted to simulate tooth surface pigments, piezoelectric electro-catalytic degradation is carried out by using the SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nanomaterial, and the pigment degradation efficiency can reach 95% or above; (3) the SnO2 / SnS2 / Ag2S heterojunction nanomaterial is used for piezoelectric electro-catalysis treatment of the streptococcus mutans pellicle, and the antibacterial rate of the pellicle can reach 90% or above; and (4) compared with a 3% H2O2 aqueous solution for treating the enamel surface structure, the SnO2 / SnS2 / Ag2S nano-material piezoelectric electro-catalysis treatment of teeth has small damage to the enamel surface structure. According to the invention, more nano materials with tooth whitening and sterilizing performance and the preparation method thereof are provided, so that the problems of single variety, single preparation method, low electron-hole separation efficiency and large side effect of the existing tooth whitening and sterilizing nano materials are solved.

A method of preparing an enhanced oil recovery composition is described. The method includes carbonizing (200) a biomass waste material (202) to provide carbon microparticles (208). The method includes functionalizing (300) the carbon microparticles (208) through an acid treatment such that the carbon microparticles have a hydrophilic surface (306). The method further includes grinding (400) the carbon microparticles to provide carbon nanoparticles (406), where the carbon nanoparticles have a hydrophilic surface (306) and a hydrophobic surface (404). A method of enhanced oil recovery is also described.

The invention relates to ultrahigh-transmittance anti-reflection multifunctional coated photovoltaic glass and a preparation method thereof, and belongs to the technical field of photovoltaic glass, the photovoltaic glass comprises a photovoltaic glass substrate, the photovoltaic glass substrate is provided with a high-transmittance reflective coating, the high-transmittance reflective coating comprises a silicon dioxide layer, a titanium dioxide layer and a nanometer material layer, and the nanometer material layer is arranged on the silicon dioxide layer. The silicon dioxide layer and the titanium dioxide layer are arranged between the photovoltaic glass substrate and the nanometer material. The preparation method comprises the following steps: S1, preparing raw materials; s2, preparing a coating; s3, coating process; s4, performing surface treatment on the nano structure; s5, coating curing and surface treatment; and S6, testing and evaluating the performance. According to the ultrahigh-transmittance anti-reflection multifunctional coated photovoltaic glass, the performance and durability of a photovoltaic cell can be remarkably improved, by arranging the high-transmittance anti-reflection coating, the light transmittance of the photovoltaic glass is improved, the overall photoelectric conversion efficiency can be improved by 5-8%, and light reflection loss is remarkably reduced.

The invention relates to the technical field of gas monitoring, and discloses an air quality monitoring method based on an olfactory chip, which comprises the following steps: step 1, preparing a multi-modal sensor system which comprises an olfactory chip module, a surface enhanced Raman scattering module and a microfluidic time division multiplexing module, the sensor surface of the olfaction chip module is modified with a metal organic framework material, and the substrate of the surface enhanced Raman scattering module is made of a core-shell structure nano material; and 2, synchronously collecting resistance response data of the olfaction chip module, spectral data of the surface enhanced Raman scattering module and temperature, humidity and wind speed data of the environment sensor. According to the invention, a multi-modal sensor cooperative detection technical scheme is adopted, the high-sensitivity detection effect on low-concentration harmful gas in air is achieved, and compared with a technical scheme of a single sensor and a fixed fusion algorithm in the prior art, the defect that accurate recognition of trace gas cannot be realized under ppb-level concentration is overcome.

The invention belongs to the technical field of agricultural production, and particularly relates to application of Chinese wolfberry-liquorice-based carbon quantum dots MIX to wheat. According to the preparation method, two raw materials including fructus lycii and radix glycyrrhizae are utilized, and the fructus lycii-radix glycyrrhizae-based carbon quantum dots MIX are synthesized through a hydrothermal synthesis method. The raw materials are cheap and easy to obtain, the synthesis method is simple and convenient, the synthesized nanometer material can be used after being simply centrifuged, and then the quality of wheat grains can be effectively improved after the wolfberry-liquorice-based carbon quantum dots MIX are sprayed to the upper middle portion of wheat.

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention relates to a preparation method and application of an inner-rigid outer-soft core-shell structure silicon dioxide blocking agent for marine drilling fluid, and belongs to the field of deepwater oil and gas drilling. N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid are polymerized and grafted on the surface of nano silicon dioxide to form the silicon dioxide blocking agent with a core-shell structure and a rigid inside and a soft outside; by means of rigid plugging of a nano material and deformation filling flexible plugging of a high-molecular polymer, shale micro-nano pores are efficiently plugged with rigid inside and flexible outside, so that the stability of a well wall is maintained, meanwhile, secondary generation of hydrates is effectively inhibited, and the safety and efficiency of deepwater drilling are improved; the plugging agent provided by the invention reduces the demand on a large number of thermodynamic inhibitors, not only saves the cost, but also has the characteristic of environmental protection.

The invention discloses a high-toughness impervious polymer modified cement-based grouting material and a preparation method thereof, and belongs to the technical field of building repair materials. The component A is prepared from a cementing material, an admixture, a fine aggregate, a composite expanding agent, a polymer for concrete modification, fibers, an early strength agent, a water reducing agent, a composite retarder, a defoaming agent, an air entraining agent, a nano material and a functional component. The system solves the technical contradiction of toughness-strength-impermeability in the polymer modified cement-based material, and the material has excellent comprehensive performance: the initial fluidity is greater than or equal to 330 mm, the 28d compressive strength is greater than or equal to 82 MPa, the breaking strength is greater than or equal to 16.8 MPa, the bending-compression ratio is greater than or equal to 0.19, the impermeability pressure value is greater than or equal to 2.6 MPa, and the material is suitable for the fields of prefabricated buildings, tunnel engineering and the like.

The invention belongs to the technical field of all-vanadium redox flow battery electrodes, and discloses a photocuring modified graphite felt for a vanadium battery and a preparation method thereof.The preparation method comprises the following steps that functional hyperbranched polyethylene containing silicon-oxygen bonds and double bonds is subjected to auxiliary stripping under the action of ultrasound, and graphite and multi-walled carbon nanotubes are modified in situ at the same time; the preparation method comprises the following steps: preparing a high-concentration carbon nanomaterial dispersion liquid, soaking a graphite felt in the carbon nanomaterial dispersion liquid, adding a photoinitiator, stirring and standing, initiating a double-bond reaction through ultraviolet light irradiation to prepare a cured graphite felt, and further calcining to obtain the modified graphite felt. The carbon nanomaterial is uniformly and firmly adsorbed on the fiber surface of the graphite felt, the conductivity of the graphite felt is increased, meanwhile, a cage type polysilsesquioxane group is introduced, the group contains rich silicon-oxygen bonds, and more reaction active sites are provided, so that the voltage efficiency and the energy efficiency of the all-vanadium redox flow battery are improved.

The invention discloses a porphyrin-based covalent organic framework nano material, a preparation method and application of the porphyrin-based covalent organic framework nano material in polyurethane, and belongs to the field of functional nano materials and antibacterial materials. The porphyrinyl covalent organic framework nano material is prepared from 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin and bis-(5-formyl furfuryl) ether through a Schiff base reaction, and the structural formula of the porphyrinyl covalent organic framework nano material is # imgabs0. The porphyrinyl covalent organic framework nano material prepared by the invention has relatively high photothermal conversion efficiency when being used as a photothermal agent, and has a relatively good sterilization effect under the condition of relatively low concentration. Besides, based on the porphyrin-based covalent organic framework nano material, a WPUS / Por-COF composite film is prepared, the composite film has excellent mechanical properties and excellent photothermal conversion efficiency, and has a good sterilization effect under the condition of relatively low concentration, bacteria can be inactivated within a short time, and the sterilization rate can reach 99% or above.

The invention provides a method for detecting the porosity of in-situ dump-leached ore, and belongs to the technical field of ore porosity detection. The method comprises the following steps: taking an ore body on site, preparing a filling agent, performing vacuum gradient impregnation, curing, dissolving and separating the ore to obtain a pore model; melting and softening the pore model to obtain the pore volume in the ore, and finally obtaining the porosity of the ore; wherein nano SiO2 is added into the filler resin, and permeation of tiny pores is guaranteed based on the size effect and the interface optimization effect of a nano material; and through vacuum gradient impregnation, sufficient permeation of tiny pores is further ensured. According to the detection method, the limitation of a drainage method on ore pores containing water-soluble minerals is avoided; the problems that ore samples need to be collected and taken back to a laboratory to be detected in a mercury injection method, a gas adsorption method and the like, the ore body structure is damaged, and consumed time is long are solved. Detection can be carried out on site, ore permeability parameters are provided for the in-situ dump leaching process, and a real-time basis is provided for flow selection.

The invention provides a high-lightning-stroke-resistant toughness continuous carbon fiber reinforced composite material, which is obtained by paving a plurality of layers of continuous carbon fiber resin prepregs and intercalation layers to obtain a preform and curing the preform through a conventional composite material molding process, each resin-based prepreg layer used in a preset layer number range close to the anti-lightning side is a first resin prepreg layer, the other resin-based prepreg layers are second resin prepreg layers, an intercalation is arranged between every two adjacent second resin prepreg layers, and the intercalation material is a micron conductive material with the surface density of 2-20 g / m < 2 >; wherein the resin in each resin-based prepreg layer is added with 2-10wt% of carbon nanomaterial, and the compressive strength of the rest resin-based prepreg layers after impact is higher than 250MPa. The composite material provided by the invention realizes integrated compounding of high lightning stroke resistance and high impact toughness. The anti-lightning performance of the composite material can meet the requirements of no internal layering and low fiber damage on the surface, and meanwhile, the compression strength CAI after impact can reach more than 200MPa.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

The invention relates to the technical field of preparation of a graphene lubricating oil additive through a graphene uniform dispersion technology, and discloses a preparation method of an efficient dispersion type graphene composite lubricating oil additive, which comprises the following steps: a) carrying out surface modification on graphene by utilizing plasma treatment; b) mixing the modified graphene with a surfactant; c) uniformly mixing the graphene dispersion liquid with poly-alpha-olefin (PAO) base oil with specific molecular weight distribution on a nanoscale by adopting a microfluidic technology to form a premix; d) adding a custom-formulated antioxidant, an extreme pressure additive and nanoscale silicon dioxide particles and / or metal oxide into the premix; through plasma treatment and ultrasonic treatment conditions, the compatibility of graphene and base oil is remarkably enhanced, the comprehensive performance of the lubricating oil is improved, meanwhile, the antioxidant, the extreme pressure additive and the nano material are introduced, and the wear resistance, oxidation resistance and extreme pressure performance of the composite additive are remarkably improved.

The invention relates to the technical field of epoxy resin coatings, and discloses an inorganic composite nano anticorrosive coating material and a preparation method thereof. The inorganic composite nano anticorrosive coating material comprises a component A, a component B and a component C, wherein the component C is obtained by mixing a functional modified inorganic composite nano material and aluminum sorbate; the component A is obtained by mixing modified epoxy resin, a defoaming agent and an anti-settling agent, and the component B comprises a polyamide curing agent. The inorganic composite nano anticorrosive coating material disclosed by the invention has excellent toughness, wear resistance, corrosion resistance, antibacterial and antifouling properties and ultraviolet resistance.

The invention provides an antibacterial synergy-mineralization regulation difunctional nano material as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: mixing a disodium hydrogen phosphate solution and a calcium chloride solution to obtain an amorphous calcium phosphate suspension; mixing the amorphous calcium phosphate suspension with a tannic acid solution to obtain an ACP-TA suspension; and finally, mixing the ACP (at) TA suspension and the hydroxypropyl trimethyl ammonium chloride chitosan solution to obtain the bifunctional nano material. A cross-linked shell is formed through the electrostatic adsorption effect of tannic acid and hydroxypropyl trimethyl ammonium chloride chitosan of the antibacterial layer, amorphous calcium phosphate is effectively wrapped, the crystallization process of amorphous calcium phosphate can be remarkably delayed, long-acting release of calcium and phosphorus ions is ensured, the antibacterial function can be effectively achieved, and the service life of the coating is prolonged. An ideal local microenvironment is provided for remineralization of tooth hard tissue, and finally biomimetic mineralization of enamel and deep mineralization plugging of dentinal tubules are achieved.

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The present application belongs to the field of polymer material technology, and in particular, relates to a polyimide composite material, a preparation method thereof, and an application thereof. The preparation method of the polyimide composite material comprises the steps of: preparing a polyamic acid slurry from a diamine monomer, a dianhydride monomer, and an organic solvent; preparing a mixed slurry from the polyamic acid slurry and a nanomaterial, and then performing a spinning imidization treatment to obtain a polyimide composite material; wherein the nanomaterial comprises at least one of nano silicon carbide, aluminum nitride, carbon nanotubes, graphene, and nano silicon dioxide. By blending polyimide with other nanomaterials having high thermal conductivity to improve its thermal conductivity, the thermal conductivity of the polyimide composite material is optimized and improved, and its heat dissipation capacity in a high temperature working environment is enhanced, while having high tensile strength and thermal conductivity. The service life of the polyimide composite material is extended, and its application range can be further expanded, such as in the back panel assembly of a smartphone.

The invention discloses a cement-based structure supercapacitor and a wall energy storage system, and relates to the technical field of energy storage. Wherein the cement-based structure super capacitor comprises a capacitor positive electrode, a capacitor negative electrode and a cement-based solid electrolyte; the capacitor positive electrode and the capacitor negative electrode are made of carbon nanomaterials; the cement-based solid electrolyte comprises cement, a conductive additive and a transition metal oxide; the cement-based solid electrolyte is arranged between the capacitor positive electrode and the capacitor negative electrode. According to the technical scheme, the energy storage performance of the super capacitor with the cement-based structure can be improved.

The invention discloses a self-energy-supply multi-mode sensing electronic skin based on ionic gel heterojunction array integration and a preparation method and application of the self-energy-supply multi-mode sensing electronic skin. The electronic skin adopts a multi-layer composite structure design and comprises an electrode array layer, a silver paste connecting layer, a nano material doped ionic gel array layer and a pure ionic gel continuous layer, and passive self-energized work is realized through a space ion migration effect at a heterogeneous gel interface. The method is characterized in that the design of a multi-layer flexible composite structure is adopted, space-time coded light, temperature, pressure and humidity four-mode stimulation can be synchronously converted into electroneurographic signals, and a collaborative identification strategy of response intensity dynamic range and synaptic learning / delay time difference is utilized; and high-precision decoupling of the multi-source signals is realized in combination with a classification decision tree algorithm. The electronic skin has the characteristics of flexibility, deformation, environment self-repairing and bionic synapse, and geometrical characteristics of a reconfigurable target source are fused through time-space domain multi-modal data.

The invention discloses high-strength concrete and a preparation method thereof in the field of concrete. The high-strength concrete is prepared from the following raw materials in parts by weight: superfine sulphoaluminate cement; coarse aggregate; quartz sand; silica fume; coal ash; nano metakaolin; silicon carbide whiskers; a graphene oxide; a pH responsive microcapsule; coating the steel fibers with liquid metal; a carbon nanotube; and a polycarboxylic acid water reducer. Release of the repairing agent is accurately regulated and controlled by adopting the pH response microcapsule, the interface performance is enhanced by combining with the liquid metal coating steel fiber, and the composite dispersion process of the nano material is optimized. Wherein the environment response efficiency of the microcapsule is remarkably improved through the collaborative design of a calcium oxide-slow release agent system and a methyl methacrylate / acrylic acid copolymerization shell layer; according to the gallium-based liquid metal coating, metallurgical bonding of fibers and a matrix is achieved through the low-melting-point characteristic, and traditional physical bonding limitation is broken through.

The invention relates to the technical field of antibacterial and antifouling fabrics, provides a preparation method of an antibacterial and antifouling fabric, and solves the problem of poor fabric durability caused by single functional component and lack of physical protection in the prior art. The preparation method comprises the following steps: S1, preparing MOFs loaded antibacterial fibers: blending a metal organic framework antibacterial composite nanomaterial and a polymer matrix material, and carrying out melt spinning to prepare the MOFs loaded antibacterial fibers; s2, constructing a self-cleaning functional coating: dispersing the fluorinated nanoparticles and a polymer adhesive in a solvent to prepare a self-cleaning coating solution; s2, performing surface activation treatment on the MOFs-loaded antibacterial fiber obtained in the step S1, soaking the MOFs-loaded antibacterial fiber in the self-cleaning coating liquid, and performing pulling and curing to form a bionic micro-nano structure coating on the surface of the MOFs-loaded antibacterial fiber so as to obtain a functional composite fiber; s3, spinning forming: taking the functional composite fibers obtained in the step S2 as warp yarns and / or weft yarns, and weaving to obtain the antibacterial and antifouling fabric.

The invention discloses a nano material modified alcohol amine grinding aid as well as a preparation method and application thereof, and the preparation method comprises the following steps: firstly, carrying out esterification reaction on alcohol amine and an acid small monomer containing double bonds to generate an esterification product; then, carrying out bulk polymerization on the esterification product and a silane coupling agent KH-570; and finally, combining the bulk polymerization product with the nano-material through a dehydration reaction of a silane coupling agent and hydroxyl on the surface of the nano-material to form the nano-material modified alcohol amine grinding aid. According to the invention, the nano material is directly grafted into the alcohol amine, so that the dispersity of the nano material in the cement grinding process can be effectively optimized, the friction force and energy consumption among cement particles can be reduced, the efficiency and stability of the cement production process can be improved, and the strength and durability of the cement product are improved.

The invention relates to a rotary micro-liquid membrane reactor in-situ detection system for monitoring the nucleation behavior of a nano material. The reactor comprises a rotor and a stator, the base angle of the stator is 70-85 degrees, the rotating speed of the stator is 500-5000 rpm, the width of a slit is 10-500 microns, it is guaranteed that fluid does not backmix when passing through the slit, and a strong shear field is formed. A micro-negative pressure sampler is manufactured to capture nucleation particles in a high-speed shear field to enter a visual observation area, and a high-speed camera and a microscope objective lens are connected in situ, so that an instantaneous image of a nucleation process is obtained in a nano-micro scale, and a transient evolution behavior of a crystal nucleus is captured in situ. The construction of the rotary micro-liquid membrane reactor in-situ detection system solves the problems that the large-scale preparation quality is poor due to the fact that a traditional stirred tank reactor is poor in structure and micro-mixing effect and uncontrollable in material nucleation and growth, and the instantaneous phase transformation and nucleation process cannot be observed due to the fact that the reactor is closed. The obtained hydrotalcite nucleation result enriches the non-classical nucleation theory, and provides guidance for large-scale preparation of nano materials.

The invention relates to the field of building material preparation, in particular to a high-strength concrete material and a preparation method thereof.According to the high-strength concrete material, through the synergistic effect of core-shell type temperature-sensitive resin particles, a pH response type expanding agent and industrial solid waste composite micro powder, multi-environment self-adaptive crack resistance and mechanical property breakthrough are achieved. The core component is prepared from 180 to 240 parts of cement, industrial solid waste composite micro powder (30 to 50 parts of fly ash-based nano SiO2 and 50 to 70 parts of steel slag micro powder), 10 to 15 parts of core-shell resin particles and 8 to 12 parts of pH response type expanding agent. According to the preparation process, multi-section intelligent stirring (ultra-high-speed shearing and dispersing of the nanometer material) and dynamic maintenance of the internet of things are adopted, the hydration process is precisely regulated and controlled, and the finally prepared material has excellent compressive strength and anti-cracking performance. The method is suitable for severe scenes such as ocean engineering and plateau buildings, and has wide application prospects.

The present invention relates to the technical field of composite materials. Provided is a preparation method for a resin matrix toughened with a silane coupling agent solution-modified nanomaterial. A specific silane coupling agent (KH560) solution is used to modify the nanomaterial, which is then used to toughen the resin matrix. KH560 has two reaction groups, which can effectively modify the surface of the nanomaterial and reduce agglomeration, while a molecular chain connecting to the surface of the nanomaterial contains an epoxy group capable of reacting with resin. By means of the molecular chain, efficient bonding between the inorganic nanomaterial and the resin matrix is achieved, the compatibility between the nanomaterial and the resin is improved, and the toughening effect of the nanomaterial on the resin is fully implemented. Moreover, in a curing process, the epoxy group does not occupy a reaction bond position between a curing agent and the resin, improving the post-curing crosslink density of the resin, and further improving the mechanical properties of the resin matrix.

The invention relates to the technical field of concrete preparation, in particular to moisturizing anti-cracking high-ductility concrete and a preparation method thereof. The moisturizing anti-cracking high-ductility concrete is prepared from the following components: 350 to 450 parts of ordinary Portland cement, 200 to 300 parts of fly ash, 30 to 50 parts of silica fume, 250 to 350 parts of quartz sand, 0.5 to 1 part of a water reducing agent, 10 to 20 parts of an expanding agent, 0.1 to 0.3 part of a retarder, 0.5 to 1 part of a thixotropic lubricant, 0.2 to 0.7 part of a modified nano material, 0.7 to 3 parts of a modified composite curing agent, 5 to 10 parts of an anti-cracking agent, 5 to 12 parts of polymer fiber and 180 to 220 parts of water. The high-moisture-retention high-water-retention concrete has the characteristics of high moisture retention and high water retention, is beneficial to maintaining the internal humidity balance, reducing cracks generated by drying shrinkage, improving the durability of the concrete, and remarkably reducing the cracking risk of the concrete in the hardening process, so that the concrete structure is more complete, the safety of the structure is improved, and the service life of the structure is prolonged.

The invention discloses a hydrogel scaffold with multiple physical gradients. The hydrogel scaffold is prepared from the following synthetic raw materials: thermo-sensitive polyisocyanide polypeptide, silk nanofibers rich in beta lamellar structures and a conductive nanomaterial. The conductive nano material dispersion liquid and the BSNF solution are uniformly mixed according to a ratio of 1: 4; at 4 DEG C, adding a BSNF-loaded conductive nano material mixture into a PIC aqueous solution, uniformly mixing, adding into a square tank with an electrode, and applying a direct-current electric field to the hydrogel; after the electric field is removed, the temperature is raised to 25 DEG C, PIC is induced to form gel, and the conductive hydrogel stent with multiple physical gradients is obtained. The hydrogel contains multiple physical gradient structures such as rigidity, conductivity and morphology. The multi-gradient hydrogel with different patterns can be constructed by regulating and controlling the shape, the position and the electric field applying time of the electrode; the preparation method disclosed by the invention is simple, convenient to operate, simple in equipment and process requirements, low in cost and capable of realizing large-scale industrial production.