132 results about "Colloidal particle" patented technology

The present application relates to a controllable preparation method of a colloidal crystal capillary column and its application in biomolecule separation, and specifically comprises the following steps: a plunger and an electroosmotic pump are prepared in situ at one end of a capillary; a buffer solution containing monodisperse colloidal particles is filled in an upper reservoir of an electric field assembly device, and a buffer solution is filled in a lower reservoir; the capillary is filled with the buffer solution, and the end of the capillary containing the electroosmotic pump is inserted into the lower reservoir; the dispersion of the colloidal solution is maintained by applying oscillation to the upper reservoir, an electric field is applied between the two reservoirs to make the colloidal particles move to the electroosmotic pump under the action of an electroosmotic flow, and a three-dimensional colloidal crystal is assembled; and the capillary is supplemented with an ultrasonic force to reduce lattice defects. The present application has the advantages of simple preparation process, controlled directional movement of colloidal particles through an electric field, improved assembly efficiency and quality of the three-dimensional colloidal crystal, and controllable assembly of the colloidal particles under the action of an electric field through regulation and control of the length and surface charge of the electroosmotic pump.

The application discloses a Pickering emulsion based on ring-shaped colloidal particles, a preparation method thereof and application thereof in biphasic interface catalysis. The Pickering emulsion is an oil-in-water emulsion, which comprises a water phase, an oil phase and ring-shaped colloidal particles. The oil phase is dispersed in the water phase in the form of small droplets. The ring-shaped colloidal particles are located at an oil-water interface or at the oil-water interface and the water phase, and the ring-shaped colloidal particles are assembled to form a monolayer structure on the oil-water interface. The Pickering emulsion is not only beneficial to the contact between reactants or between the reactants and a catalyst, but also can enhance the interface mass transfer rate, promote the product to rapidly diffuse from one phase to another phase, has advantages of high conversion rate, high catalytic efficiency, simple product separation and the like, and has an important application prospect in the field of interface catalysis.

The application discloses a structural color pressure-sensitive film based on a hollow polymer colloidal photonic crystal and a preparation method and application thereof, and belongs to the technical field of force-induced color-changing materials. The preparation method of the structural color pressure-sensitive film comprises the following steps: (1) uniformly dispersing core-shell nano colloidal particles in an organic solvent to obtain a colloidal particle dispersion liquid; the shell layer of the core-shell nano colloidal particles is a polymer material, and the core layer is an inorganic oxide; (2) coating the colloidal particle dispersion liquid on the surface of a flexible substrate, and obtaining a precursor photonic crystal film after heating; and after removing the core layer of the core-shell nano colloidal particles in the precursor photonic crystal film by acid treatment etching, the structural color pressure-sensitive film is obtained. The preparation method of the structural color pressure-sensitive film is simple, the conditions are mild, and no pigment dye molecules are needed; by utilizing the pressure deformation and shape memory characteristics of a single hollow polymer colloidal particle itself and the inherent structural color characteristics of a photonic crystal, the structural color pressure-sensitive film can realize the regulation and memory of rich and high-saturation structural colors under the action of pressure.

The utility model discloses a destabilization coagulation separation device and relates to the technical field of sewage treatment. Effluent of the coagulation reaction area enters the flocculation reaction area, effluent of the flocculation reaction area enters the shallow settlement area, an inclined plate is arranged in the middle of the shallow settlement area, a rotary mud scraper is arranged at the lower part of the shallow settlement area, supernate of the shallow settlement area enters the gravity settlement area, the gravity settlement area adopts winding corridor type design, and effluent of the gravity settlement area enters the water outlet groove. The device disclosed by the utility model has the beneficial effects that the gravity settling area is arranged behind the shallow settling area, colloidal particles which do not participate in flocculation are settled in the gravity settling area, the settling time of the colloidal particles is prolonged through the ambulatory design of the gravity settling area, and the settled colloidal particles flow back to the coagulation reaction area through the screw pump B to participate in reaction again after being gathered, so that the flocculation effect is improved. The height of the rectangular water outlet groove is in direct proportion to the flow velocity, the lifting height of the lifting rod is observed through the gradienter, the water outlet flow can be calculated, and metering is simple and reliable.

The invention provides a micro-polluted water purification device and method, and belongs to the technical field of water treatment. The problems that an existing micro-polluted water purification technology is dual-polarized, purification is not thorough, secondary pollution is prone to being generated, and adaptability is poor are solved. The method comprises the following steps: in a pretreatment unit, intercepting large-particle suspended impurities through a bionic cilium type interception structure, and regularly carrying out backwashing; in the bionic primary filtering unit, colloidal particles, microorganisms and macromolecular organic matters are filtered out through a bionic glomerular filtering structure; in the bionic intermediate purification unit, heavy metal ions and small molecular organic matters are adsorbed through a bionic cell membrane adsorption structure; in the bionic deep filtering unit, deep interception and adsorption are carried out through a bionic root system filtering structure; the effluent quality is detected in the effluent unit, and if the water quality does not reach the standard, the effluent flows back to the water inlet end of the pretreatment unit. By means of physical interception and physical adsorption effects of a biological bionic structure and natural degradation of a biological agent, secondary pollution is avoided.

The invention relates to a side slope alkali-reducing ecological substrate layer and a preparation method thereof. The substrate layer comprises planting soil, a hydraulic inorganic cementing agent, an alkali-reducing composition, a bionic feather structure formed by spraying and adhering carbon fibers and soybean protein fibers, and an additive; the bionic feather structure contains hydrophilic colloidal particles and a halophilic and alkaliphilic biological agent. A slowly-released acidic group is introduced into the alkali-reducing composition, so that alkalinity is continuously neutralized, and the problem that plants are difficult to grow due to the fact that the pH value of soil is maintained to be 11-14 is solved. Moreover, the bionic feather structures dispersed in the matrix form tiny pores, a large amount of air is stored in the tiny pores, a barrier for effectively preventing convection of cold and hot air is formed, and the temperature stability of the matrix layer is improved; the hydrophilic colloidal particles in the matrix can keep the fluffy and breathable properties of the matrix and avoid water loss and vegetation root system damage caused by dry cracks on the surface of a base layer, so that rooting and survival of plants can be restored, and wind erosion resistance and water erosion resistance are also facilitated.

The application discloses a kind of high charge coagulant aid synergic PAC's power plant raw water processing method, belong to water treatment technical field.To solve the charge neutralization capacity of existing separate PAC process insufficient, large reagent consumption, effluent aluminum residual risk higher problem, the application simultaneously adds the organic coagulant aid with PAC reagent in raw water, and the charge density of organic coagulant aid is higher than PAC;Organic coagulant aid is preferentially adsorbed on the surface of negatively charged colloidal particles to realize rapid charge neutralization and destabilization, and then combined with PAC to form dense alum flower, significantly reducing PAC demand.The system uses "flow rate proportional feedforward + turbidity feedback" algorithm to automatically adjust the dosage, and controls the proportion by seasons, which can reduce PAC consumption by more than 60%, the turbidity of produced water is stable below 0.6NTU, significantly reducing the operation cost and aluminum residual risk, ensuring the safety of subsequent system, and the alum flower settles quickly, and the effluent water quality is stable and excellent.

The application belongs to the technical field of soft magnetic material preparation, and particularly relates to a ferrosilicon magnetic material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing ferrosilicon magnetic powder and a passivation agent, and then performing primary heat treatment and cooling to room temperature at a speed of not higher than 30 DEG C / h; (2) mixing the magnetic powder obtained in the step (1) with the passivation agent to obtain passivated magnetic powder; (3) adding a first coating agent to the passivated magnetic powder to perform primary coating, and then performing secondary heat treatment; and (4) adding a second coating agent to the magnetic powder obtained in the step (3) to perform secondary coating, pressing, and then performing tertiary heat treatment. The average particle size of the first coating agent is 300 nm-1 mu m; and the second coating agent comprises colloidal particles, and the average particle size of the colloidal particles is not higher than 100 nm. The preparation method can improve the density and effective magnetic permeability of the ferrosilicon magnetic material, so that the ferrosilicon magnetic material has excellent magnetic performance, the loss is greatly reduced, heat generation is reduced, and the device is beneficial to energy saving and high efficiency.

The invention belongs to the technical field of crystal growth, and particularly relates to a Cs3Cu2I5 single crystal growth method. The method specifically comprises the following steps: taking cesium iodide and cuprous iodide as precursors, carrying out stirring reaction on the precursors and lewis acid in a polar aprotic solvent, hydrolyzing the lewis acid to generate an acid environment, inhibiting Cu < + > oxidation, and meanwhile, forming uniformly dispersed colloidal particles to obtain a precursor solution; and adding an anti-solvent into the precursor solution to enable the precursor solution to reach a supersaturated state, filtering, and carrying out single crystal growth by adopting an inverse temperature crystallization method. Lewis acid is added into the precursor solution, oxidation of Cu < + > is inhibited by utilizing a weak acid environment generated by hydrolysis of the Lewis acid, and the colloid stability of the precursor is improved, so that growth of the high-quality large-size Cs3Cu2I5 single crystal is promoted. The method is simple and convenient to operate and easy to control, can effectively improve the scintillation luminescence performance of the single crystal, and has a wide application prospect.

The invention relates to the technical field of ethylene propylene rubber wet condensation processes, in particular to a method for improving the wet condensation effect of ethylene propylene rubber. The method comprises the following steps: in a wet condensation process flow, adding a prepared dispersant aqueous solution into a receiving tank, and enabling the dispersant aqueous solution to enter a condensation kettle under the action of circulating hot water. According to the invention, the diameter of the colloidal particles in the coagulation kettle can be 5-10mm, the colloidal particles can be ensured to have good dispersibility in the coagulation kettle, pipeline blockage, glue hanging and shaft sticking of the coagulation kettle are avoided, and the stable operation time of wet coagulation is prolonged.

This application provides high molecular weight block copolymers comprising at least one block A comprising repeating units derived from monomers comprising lactam and acryloyl moieties and at least one block B comprising repeating units derived from hydrophilic monomers. The application further provides compositions comprising the block copolymers and applications thereof in various industrial areas including personal care. The application furthermore provides compositions comprising colloidal particles of the block copolymers. The variables x, y, R8 and R9 are described herein (I). Wherein each x and y is independently an integer having a value from about 10 to about 10000, and each R8, and R9 is independently selected from the group consisting of hydrogen, methyl, and combinations thereof.

The utility model discloses a dewatering device for sludge separation treatment, which belongs to the technical field of sewage treatment and comprises a bottom plate, a support plate is fixedly connected to the left side of the top of the bottom plate, and a mixing box is fixedly connected to the top of the support plate. Sludge in a sludge tank is conveyed to the inner cavity of the mixing box through a sludge conveying pipe by an external screw pump, after conveying is completed, a flocculating agent is added through a chemical inlet, meanwhile, a stirring rod is driven by a first motor to rotate, stirring blades are driven by the stirring rod to rotate, the flocculating agent and the sludge are stirred through the stirring blades, and the flocculating agent and the sludge are mixed uniformly. In the process of mixing the flocculating agent and the sludge, the electrical property of organic colloids containing negative charges in the sludge can be neutralized, colloidal particles are promoted to be rapidly coagulated into large floccules which are easily separated from suspension liquid, rapid sedimentation of the sludge is facilitated, and the purpose of pretreatment is achieved. And subsequent solid-liquid separation is facilitated.

The application discloses a kind of micro tube robot assembly, drive and radial extrusion method, assembly includes the following steps: step one, 0.05-2wt.% magnetic colloidal particles are assembled into two-dimensional monolayer colloidal film under xy plane oscillation magnetic field;Step two, z direction direct current magnetic field is applied and gradually increase magnetic field intensity, until monolayer colloidal film breaks into sheet;Step three, precession magnetic field is applied, sheet is bent to form the micro tube robot of dense hollow tubular structure;Drive: micro tube robot can be accurately controlled by three-dimensional magnetic field and drive direction and speed, hollow interior space is used to capture and transport micro cargo;Radial extrusion: micro tube robot assembled under oscillation magnetic field can realize radial direction repeated extrusion without breaking.The present application realizes metastable assembly from one-dimensional isotropic microspheres to three-dimensional micro tubular micro robots for the first time, is suitable for newtonian fluid and non-newtonian fluid, and can meet different application scenarios.

The application relates to the technical field of water treatment flocculants, and discloses an aluminum-iron sulfate salt flocculant and a preparation method thereof. The method is characterized in that firstly, the attapulgite is subjected to acid activation, silanization, starch etherification grafting and free radical copolymerization modification, so as to obtain a modified attapulgite functional carrier which has a nano adsorption skeleton, an organic long chain and strong positive electricity; then, the carrier is taken as a core to carry out a hydrolysis-supporting reaction with ferric sulfate, aluminum sulfate and carbide slag under pH control; finally, sodium silicate is introduced to construct an inorganic gel network, and the aluminum-iron sulfate salt flocculant is obtained through ripening and drying. Through construction of an organic-inorganic hybrid structure, the application realizes multiple synergies of electric neutralization, adsorption bridging and net capture and sweeping, the product has high removal capacity for colloidal particles and dissolved organic matters, the flocculation body is compact and can be rapidly settled, and the product has the comprehensive advantages of low raw material cost, stable process and environmental friendliness.

The invention belongs to the field of pharmaceutical preparations, and relates to a nano-liposome preparation based on phase transfer induced assembly and a preparation method thereof. The nano-liposome preparation comprises an active pharmaceutical ingredient, an amphiphilic lipid component and a lipid membrane structure regulator. The preparation method comprises the following steps: firstly, preparing active pharmaceutical ingredients into colloidal particles as a drug core; dispersing the core in an organic solvent containing a lipid component and a lipid membrane structure regulator to form an oil phase dispersion system; the preparation method comprises the following steps: preparing an oil phase system, then contacting the oil phase system with a water phase, carrying out phase transfer induced assembly to enable lipid to spontaneously coat a drug core on a water-oil interface and migrate to the water phase so as to form a nano-liposome with a lipid double-layer structure, and finally removing an organic solvent, thereby obtaining the nano-liposome. The method disclosed by the invention has the advantages of high drug loading capacity, strong universality, simple and convenient process, easiness in large-scale production and the like, and is suitable for efficient loading of various water-soluble drugs.

The present invention relates to a system for the release of bioactive compounds comprising biodegradable colloidal particles with an average size less than 500 nm, where the biodegradable colloidal particles comprise an anionic polysaccharide and a cationic polysaccharide. Furthermore, its method of extraction includes: (a) estimating the stoichiometric charge ratio between an anionic polysaccharide, and a cationic polysaccharide; (b) preparing a solution with the anionic polysaccharide based on the stoichiometric charge ratio and adjusting to an acidic pH; (c) preparing a solution with the cationic polysaccharide based on the stoichiometric charge ratio and adjusting to an acidic pH; (d) adding the solution with the cationic polysaccharide to the solution with the anionic polysaccharide to obtain biodegradable colloidal particles; (e) reducing the particle size of the biodegradable colloidal particles; (f) separating the biodegradable colloidal particles from the supernatant; and (g) resuspending the biodegradable colloidal particles and storing them.

A preparation method of an electroplated part includes the steps of plating a porous metal coating layer, placing the porous metal coating layer in a graphite colloid, and depositing graphite colloidal particles into the porous metal coating layer. The porous metal coating layer is plated at or proximate an outer side of a substrate of the electroplated part. The graphite colloidal particles are deposited into pores of the porous metal coating layer from the graphite colloid to form a graphite alloy coating layer.

The invention discloses a polymer wet coagulation method which comprises the following steps: coagulating a polymer glue solution in at least two coagulation kettles connected in series to obtain polymer aqueous colloidal particles; wherein the steam stripping gas discharged from the first condensation kettle is cooled and then subjected to oil-water separation, and a wet solvent and layered water are obtained; the stripping gas discharged by the first condensation kettle is entrained with rubber scraps, and the method further comprises the following steps: before the stripping gas discharged by the first condensation kettle is cooled, contacting layered water with the stripping gas to take away the rubber scraps in the stripping gas, and then returning the layered water entrained with the rubber scraps to the first condensation kettle. According to the invention, on the premise of not changing the original process conditions of the steam stripping kettle, a trace amount of fine adhesive tape is returned to the first condensation kettle by using the filtering effect when layered water is in contact with the steam stripping gas, so that the amount of adhesive crumbs entrained in the steam stripping gas of the first condensation kettle is reduced; and meanwhile, layered water circularly flows and is updated constantly, so that the blocking and hanging phenomena are avoided.

The present invention relates to a metal powder containing a metal of Au, Ag, Cu, or an alloy thereof, having an average particle size of 0.1 μm or more and 0.4 μm or less, and purity of 99.9% by mass or more. In this metal powder, a presence ratio, in terms of the number of particles, of non-spherical particles in the metal powder having a ratio (b / a) of a minor axis “a” and a major axis “b” of 3 or more is 1% or less. As a method for producing such a metal powder, in a wet reduction method including a metal colloid synthesis step and a metal powder granulation step of granulating metal colloidal particles into a metal powder, surfactants having alkyl groups having carbon numbers falling within specified ranges are preferably used as first and second dispersants in the metal colloid synthesis step and the metal powder granulation step.

The present application relates to a kind of slurry purification method and device, belong to slurry purification technical field, by adding breaker and combining oxidation / acidolysis and thermochemical treatment, the stable structure of colloidal particle is destroyed, the microfine particle wrapped is released, further using helical path partition addition surfactant, ensure that reagent is evenly spread in combination with stirring, significantly reduce slurry apparent viscosity and improve fluidity.Afterwards, using the centrifugal-shear synergistic effect of high-speed centrifuge and hydrocyclone strengthens particle separation efficiency, shortens residence time and inhibits the risk of laminar flow blockage;While applying electric field drives charged particle to be enriched to electrode area.Finally, through the deep dehydration process of filter aid auxiliary, realize that slurry moisture content is greatly reduced, this integrated process not only reduces the hydrodynamic resistance and processing volume expansion, also significantly alleviates the laminar flow resistance, wear and frequent blockage problem of pipeline and equipment.

The utility model belongs to the technical field of water treatment, and relates to a drainage water resource utilization system. Comprising drainage water pretreatment equipment, a drainage water filtering device, a first water tank, an ultrafiltration device, a reverse osmosis device and a second water tank which are sequentially connected, suspended matters and part of soluble impurities in the drained water are removed through drained water pretreatment equipment; suspended solids, particulate matters, insoluble impurities and the like in the mine water are further removed through the drainage water filtering device, and it is ensured that the water is clear; impurities such as macromolecular organic matters and colloidal particles in the mine water are removed through the ultrafiltration device; soluble salts and heavy metal ions are removed through the permeation device, so that pure water resources are obtained; according to the device, drainage water is converted into irrigation water and a hydrogen production water source, cyclic utilization of water resources is achieved, waste of the water resources is avoided, and the utilization rate of the water resources is increased.

The invention discloses a design method of an on-line monitoring system for directly observing the flow velocity of underground water, which comprises an observation probe, a data acquisition terminal and a cloud data platform, and is characterized in that the motion trail of colloidal particles in a well is tracked in real time through the observation probe, and the flow velocity of the colloidal particles in the well is calculated through a mode of reducing data randomness and redundancy-coordinate conversion-component accumulation. The discrete motion trail of the colloidal particles is converted into continuous time average displacement; the concept of the accumulated flow velocity is further proposed, the theoretical relation that the accumulated flow velocity approaches the actual flow velocity under long-time monitoring is defined, the problem that the particle motion state and the actual flow velocity are difficult to associate is solved through a conversion method of pumping test calibration and conversion coefficient correction, and online automatic monitoring and real-time data output are achieved; an efficient data channel is provided for subsequent data analysis and application, a basis is provided for water conservancy departments to evaluate underground water mining rationality, to optimize irrigation schemes in the agricultural field and to track pollution plume migration in the environmental protection field, and a monitoring-analysis-decision application closed loop is formed.

The invention discloses a sewage treatment agent for papermaking wastewater, a composite bidirectional coagulation system is adopted, the sewage treatment agent comprises an iron-based infinite super-effect water purifying agent of a first phase and an organic polymer synergistic component of a second phase, the pH adjusting range of the composite bidirectional system is 4.0-6.5, and an inorganic-organic synergistic adsorption-bridging effect is formed, so that the sewage treatment agent can be used for treating the papermaking wastewater. The deep removal of suspended matters, organic colloids and anionic pigments in the papermaking wastewater is realized. According to the invention, a composite two-phase sewage treatment system is constructed, a high-activity iron-based inorganic core and a high-molecular organic shell are effectively compounded, and uniform and stable formation of a core-shell structure is realized by optimizing interface bonding, nanoparticle coagulation aid, temperature, pH and other process parameters; therefore, the removal efficiency of colloidal particles, lignin and high-molecular organic matters in the papermaking wastewater is remarkably improved; meanwhile, the composite system has high shear resistance, structural self-healing performance and rapid settling performance, and treatment efficiency, economical efficiency and industrial feasibility are all considered.

This invention relates to the field of water treatment technology and discloses a method for preparing electronic-grade ultrapure water. The method involves filtering raw water through a 500-mesh stainless steel screen to remove organic matter, residual chlorine, and odors, followed by softening treatment with ion exchange resin to reduce hardness. The pretreated water is then fed into an MBR reactor, where air bubbles are used to flush the surface of the MBR flat-sheet membrane. The effluent from the MBR biological treatment is then fed into an ultrafiltration permeate tank, where it undergoes a three-stage degassing process, including microbial elimination, removal of residual suspended solids and colloidal particles, and reverse osmosis treatment. After cooling, the water is fed into an intermediate water tank. The effluent from the intermediate water tank is pumped into an EDI water treatment system. After deep purification via EDI, resin debris and microorganisms are removed by filtration. The electronic-grade ultrapure water is then stored in a nitrogen-sealed water tank and returned to the front end of the EDI system via a circulation pipeline. This invention improves desalination rate and impurity removal accuracy, enables automatic replacement of filter materials without shutdown, and ensures continuous production.

This invention provides a functional slurry and its preparation method, a coated separator, and a lithium-ion battery, belonging to the field of lithium-ion battery technology. The functional slurry prepared by this invention has a low film-forming temperature, stable colloidal particles, no agglomeration, stable coating adhesion, and good uniformity in peel strength. When coated on a separator substrate, it can impart heat-resistant safety performance or electrode adhesion characteristics to the separator: low thermal shrinkage rate at high temperatures, excellent electrode adhesion, high peel strength, and no coating powder shedding during processing. The functional coating prepared using this slurry is firmly bonded to the substrate surface, effectively improving the problem of large fluctuations in coating performance, especially peel strength, under different seasons, temperatures, and geographical conditions. This improves the consistency of coated separator products, improves the consistency of cell performance, increases the yield of separators and cells, and reduces the problem of high cell short-circuit rates caused by coating powder shedding.

This invention relates to the field of wastewater treatment technology, specifically disclosing a coagulant for treating low-temperature, low-turbidity water and its preparation method. The coagulant provided by this invention utilizes composite modified polyferric chloride to provide efficient charge neutralization and colloidal destabilization capabilities at low temperatures, polyethyleneimine to enhance the rapid destabilization of colloidal particles with its high cation density, and modified carboxymethyl inulin to exert long-chain adsorption bridging and net-catching sweeping effects. The three work synergistically to achieve rapid destabilization, aggregation, and sedimentation of colloidal particles in low-temperature, low-turbidity water, effectively solving the problems of poor low-temperature activity and low turbidity removal rate of conventional coagulants.

Compositions and colloidal particles are provided that may be used to improve a papermaking process. The compositions and colloidal particles may include a polymer and an inorganic salt. A papermaking process carried out using the presently disclosed compositions and colloidal particles may produce a paper product that has increased strength properties.

The invention relates to the technical field of water treatment flocculants, and discloses an aluminum ferric sulfate flocculant and a preparation method thereof.The method comprises the steps that firstly, attapulgite is subjected to acid activation, silanization, starch etherification grafting and free radical copolymerization modification, and a modified attapulgite functional carrier with a nano adsorption framework, an organic long chain and strong electropositivity is prepared; taking the carrier as a core, carrying out hydrolysis-load reaction on the carrier, ferric sulfate, aluminum sulfate and carbide slag under the condition of controlling pH, finally introducing sodium silicate to construct an inorganic gel network, and curing and drying to obtain the aluminum ferric sulfate flocculant. By constructing an organic-inorganic hybrid structure, multiple synergy of electric neutralization, adsorption bridging and net trapping and sweeping is achieved, the product has efficient removal capacity on colloidal particles and soluble organic matter, flocs are dense, sedimentation is rapid, and meanwhile the comprehensive advantages of being low in raw material cost, stable in process and environmentally friendly are achieved.

The invention belongs to the technical field of functional polymer materials, and discloses a colloidal crystal coating with structural color and a preparation method and application thereof, the preparation method comprises the following steps: 1) mixing water, acrylic acid, an initiator, styrene and a first cross-linking agent, and polymerizing to obtain a colloidal particle emulsion; 2) continuously adding an initiator, butyl acrylate, methyl methacrylate, acrylic acid and a second cross-linking agent into the colloid particle emulsion, and then carrying out secondary polymerization to obtain a core-shell colloid particle emulsion; 3) concentrating the core-shell colloid particle emulsion, and adding carbon black to obtain an electrophoretic deposition solution; and (4) platinum serves as a cathode, metal with the electrode potential lower than that of platinum serves as an anode, electrophoretic deposition is conducted, and the colloidal crystal coating with the structural color is generated on the surface of the anode. The electrophoretic deposition liquid composed of the core-shell colloidal particle emulsion and the carbon black is used, the colloidal crystal coating with the structural color is deposited on the metal surface through electrophoretic deposition, and the preparation process is simple, controllable and environmentally friendly.

The present invention relates to a composite current collector and its preparation method, electrodes, and batteries. The composite current collector includes an insulating substrate, a first metal layer set on both surfaces of the thickness direction of the insulating substrate, and a second metal layer set on the surface away from the insulating substrate on the first metal layer. Multiple colloidal particles are attached to the surface of the first metal layer away from the insulating substrate, with the colloidal particles evenly distributed. The second metal layer is set on the first metal layer, and the second metal layer encapsulates the evenly distributed colloidal particles. By setting the composite current collector with specific structures of the colloidal particles, it overcomes the issues of low electrode peel strength and capacity drop in long cycle batteries, significantly enhancing the stability of long cycle battery electrodes.