187results about How to "Superhydrophilic" patented technology

The invention provides a super-hydrophilic coating with a long-acting antibacterial property and a preparation method thereof. The preparation method comprises the following steps that the surface ofa substrate material is pretreated; the pretreated substrate material is put into a slight acidic buffer solution, then a polyphenolic substance, a multi-amine compound, an antibacterial agent and anoxidizing agent are added to react; a reaction product is immersed in deionized water, ultrasonic cleaning is carried out, then drying is carried out under a nitrogen condition to prepare the coating.The super-hydrophilic coating with the long-acting antibacterial property and the preparation method thereof have the advantages that the operation is simple, the reaction condition is mild; the prepared coating material contains the polyphenolic substance, and a large number of carboxyl, phenolic hydroxyl group, quinonyl, amidogen and other functional groups and metal ions or agents which has the antibacterial property, so that the metal ions and the antibacterial agents achieve the long-term existence of the antibacterial agent through the mutual effect with the phenolic hydroxyl group function group or the accumulation of a pi-pi system. The coating can be applied to the preparation of wound dressing materials in the field of medical materials.

The invention provides a preparation method of a super-hydrophilic thin film based on a glass surface, relates to the super-hydrophilic thin film, and provides the preparation method of the super-hydrophilic thin film based on the glass surface, which has the advantages of simple needed equipment, few investment, wear resistance and long durability. The preparation method comprises the steps of: preparing SiO2 sol by an acid-alkali two-step method; diluting the SiO2 sol and adding polyethylene glycol; ultrasonically oscillating and coating the SiO2 sol on a glass substrate; and sintering to obtain the glass with the super-hydrophilic thin film on the surface. The preparation method has a simple process flow and few investment; and the obtained super-hydrophilic thin film has the characteristics that 1) light irradiation is not needed and the super hydrophilicity also exists at the hard part; 2) the super-hydrophilic thin film is super-hydrophilic and durable; the super-hydrophilic glass prepared by the method is placed indoors for three months and still has the super hydrophilicity after being detected; and 3) the bonding force of the film is firm and wear-resisting; and under the laboratory conditions, the thin film on the surface of the glass is forcedly brushed by a test tube brush and the result shows that the super-hydrophilic glass still has the super hydrophilicity.

The invention discloses a super-hydrophilic and underwater super-lipophobic coating which consists of a substrate and an organic / inorganic hybrid coating, wherein the organic / inorganic hybrid coating containing an ampholytic ionic group is coated on the surface of the substrate. 1, the method disclosed by the invention is simple in process, easy in preparation of raw materials, simple in equipment and low in cost, and the functional coating can be prepared on the surfaces of different substrates in a large area, so as to achieve super hydrophilicity and underwater super lipophobicity; and 2, by introducing a betaine-type ampholytic ionic compound of a cell outer membrane simulating molecular structure to the prepared super-hydrophilic and underwater super-lipophobic coating, the prepared functional coating not only has functions of self-cleaning, anti-fogging, underwater oil resistance and the like, but also has excellent performances of resisting biological adhesion and the like.

The invention provides a biological stain-resistant coating with long-acting super-hydrophilic performance and a preparation method thereof. The preparation method comprises the following steps that pre-treatment is conducted on the surface of a base material; the treated base material is placed in slightly acidic buffer liquid, and then a polyphenol compound, a polyamine-based compound and an oxidizing agent are added for reaction; a reaction product is immersed in deionized water for ultrasonic cleaning, and then under a nitrogen condition, drying is conducted to obtain the biological stain-resistant coating with the long-acting super-hydrophilic performance. The method is simple to operate and mild in reaction condition, a prepared coating material has the polyphenol compound and a large amount of functional groups of carboxyl, phenolic hydroxyl, quinonyl, amido and the like, and the surface of the coating shows the long-acting super-hydrophilic performance. The adhesiveness betweenthe modified coating prepared by adopting the method and the base material is excellent, and the super-hydrophilic performance of the surface of the coating makes the material have an excellent biological stain-resistant function, so that the biological stain-resistant coating with the long-acting super-hydrophilic performance can be used for preparing materials of implanted devices, medical diagnosis instruments, medical sensors and the like.

The invention relates to a super-hydrophilic self-clean anti-fog coat, process of preparation, and application, belonging to nanometer material preparation technical field. The inventive super-hydrophilic self-clean anti-fog coat is assembled by statistic and prepared by dip-coating method, with simple and cheap device, to support industrialization. The surface structure of the coat is similar with natural lotus leaf surface, and the coat is assembled from silicon dioxide composite particles similar as natural raspberry fruit structure. The coat can be used on glass product, especially on the substrates demanding anti-fog treatment in damp air condition, as southern rainy weather.

The invention relates to a production method of a highly stable and biodegradable double-network oil-water separation net membrane. A copper net with the surface having a nanosheet rough structure after oxidation treatment is adopted as a substrate support material, natural polyose substances sodium alginate and chitosan having the advantages of high hydrophilicity, good salt resistance and biodegradability are used as main body glue-forming materials, and an inner layer chitosan network is partially crosslinked by a natural biological cross-linking agent genipin to make the inner layer chitosan network fixed on the copper net substrate and keep the flexibility of the network structure of the chitosan; and an outer sodium alginate network is physically cross-linked and fixed by adopting divalent calcium ions, and the inner layer and the outer layer are self-assembled by electrostatic force and hydrogen bonds to form a double-layer network structure. The oil-water separation net membrane with the special double-network structure has the advantages of high oil-water separation efficiency, good resistance to oil stains, acids, alkalis and high-salt environments, high stability and good durability; and additionally, a coating layer formed by the net membrane is green and environmentally friendly, and is completely degradable.

The invention discloses a method for preparing super-microporous flexible carbon cloth.Carbon cloth serves as a raw material and is calcined at high temperature in activators, and the super-microporous flexible carbon cloth is obtained.The calcination temperature is 400-1,500 DEG C, and calcination time is 1-24 h.The activators are nitrogen and oxygen, and the volume ratio of nitrogen to oxygen is 100:(0.5-2).The invention further discloses the super-microporous flexible carbon cloth and application of the super-microporous flexible carbon cloth to a flexible all-solid-state capacitor and water electrolysis hydrogen making.According to the technical scheme, a calcination method is utilized for the first time, no reagent is needed, and the synthesis method is simple, environmentally friendly and beneficial for large-scale production; the prepared super-microporous flexible carbon cloth has a large specific area, high-proportion micropores, good electric conductivity and good flexibility and super hydrophilicity.

The invention relates to a method for forming a super-hydrophilic anti-reflective composite coating on a glass substrate, and the super-hydrophilic anti-reflective composite coating formed by use of the method. The method comprises the steps of soaking the glass substrate into a sol solution containing silica particles, removing organic matters by use of a pulling method and by virtue of calcining, soaking the glass substrate covered with a silica coating into the precursor sol solution of titanium dioxide to prepare a titanium dioxide coating on the glass substrate covered with the silica coating by use of the pulling method, and then calcining titanium dioxide into an anatase crystal form, and finally, structuring the high-strength and long-acting super-hydrophilic anti-reflective silica / titanium dioxide composite coating on the glass substrate. The light transmittance of the glass substrate covered with the high-strength and long-acting super-hydrophilic anti-reflective composite coating is increased to 96.9% from 91.2% of blank glass, and the contact angle of water on the surface of the glass substrate is 0-1 degree; even after the glass substrate is placed indoors for 75 days, the contact angle of water on the surface is still kept below 5 degrees.

The invention discloses a low-temperature preparation method of a TiO2-based organic / inorganic compound photocatalysis flexible film. The method comprises the following steps of: adjusting the pH value of a water solution containing a titanium salt with inorganic alkali; dissolving a regular titanic acid precipitate with hydrogen peroxide to obtain a clear and transparent titanium peroxide solution, heating or adding a catalyst for removing free oxygen from a titanium peroxide solution; mixing the solution with a polymer emulsion to obtain uniformly-mixed compound material emulsion; and forming a film on the surface of an organic flexible substrate, and performing thermal treatment to form a film material with a photocatalysis performance. The TiO2-based organic / inorganic compound photocatalysis flexible film has multiple functions of photocatalysis, antibiosis and super hydrophilicity; and in addition to the formation of a film on the conventional rigid substrate, a very good film forming condition is created particularly on the organic flexible substrate due to the adoption of a low-temperature preparation process, so that the application field of the film is greatly expanded.

The invention relates to a preparation method of a modified polyvinylidene fluoride membrane, and in particular relates to a preparation method of an underwater super-oleophobic modified polyvinylidene fluoride membrane. According to the preparation method provided by the invention, silane coupling agent matter which is low in price and is easily available serve as a co-modifying agent, and the auto-polymerization of dopamine and the hydrolytic condensation of the co-modifying agent are simultaneously carried out in an alkaline environment, so that the underwater super-oleophobicity of a polymer membrane is realized, and the polymer membrane has excellent oil-water separation performance. The method comprises the following steps: firstly, soaking a polyvinylidene fluoride micro-filtration membrane in absolute ethyl alcohol, and impregnating the polyvinylidene fluoride micro-filtration membrane in an impregnation liquid; secondly, dissolving dopamine hydrochloride and the co-modifying agent into the impregnation liquid containing the polyvinylidene fluoride micro-filtration membrane, and standing; and thirdly, taking out the polyvinylidene fluoride micro-filtration membrane, cleaning the polyvinylidene fluoride micro-filtration membrane with clear water, and then airing the polyvinylidene fluoride micro-filtration membrane to obtain the modified polyvinylidene fluoride membrane. The method is simple, and the prepared oil-water separation membrane can be reused and can be prepared on a large scale. The preparation method is used for modifying a porous polymer membrane.

The invention provides a preparation method of a titanium implant surface with a micro-nano composite structure. The preparation method comprises the following steps: (1) performing blast sanding and ultrasonic processing on a smooth implant surface, then washing with water, and drying; (2) processing the implant surface in an oxalic acid solution for 30-240 min, then washing with water, and drying, wherein the concentration of the oxalic acid solution is 30% to saturation; and (3) taking a mixed acid solution of H2SO4 with the concentration of 98% and H2O2 with the concentration of 30% for processing, and then washing with water to obtain the titanium implant surface with the micro-nano composite structure. According to the preparation method of the titanium implant surface with the micro-nano composite structure, disclosed by the invention, the implant surface with the micro-nano composite structure is obtained by performing a secondary etching on a micron-structure surface processed by sand blast and oxalic acid, and compared to the micron-structure surface, titanium implant surface is provided with a microstructure with more levels, which is capable of providing more comprehensive environment signals for cell growth and tissue regeneration; and the titanium implant surface with the micro-nano composite structure has super-hydrophilicity and the protein adsorption capability is remarkably enhanced, which are of a great significance to further improving the surface biological activity of implants.

The invention relates to a long-acting super-hydrophilic polysilazane coating and a preparation method thereof. The preparation method comprises the following steps of: coating a polysilazane solutionon the surface of a base material; performing photocuring or photo-thermal curing to form a polysilazane coating; and coating or soaking the surface of the polysilazane coating by a surface treatingsolution, and then, performing thermal treatment. The obtained coating has a contact angle smaller than 5 degrees between a water drop and the surface, is in a spreading-out and adhering state, and easily penetrates into the bottom of dirt or the oil strain for floating and washing away the dirt and the oil strain, so that the self-cleaning effect is achieved, and mechanical and chemical stabilityis good. The coating disclosed by the invention has a self-cleaning function and an anti-fog function, and has a wide application prospect in aspects of buildings, kitchen appliances, solar cell panels, outdoor cultural relics, and the like.

The invention discloses a nano-coated waterproof and anti-fouling corrugated carton. The nano-coated waterproof and anti-fouling corrugated carton comprises a corrugated paperboard. The corrugated paperboard is sequentially composed of surface paper, corrugated paper and inner paper from outside to inside. The surface of the surface paper and the surface of the inner paper are coated with nano waterproof and anti-fouling paint. The paint is prepared from, by weight, 50-60 parts of epoxy resin, 10-20 parts of nano titanium dioxide, 20-30 parts of curing agents, 5-10 parts of active diluents, 1-2 parts of dispersing agents and 10-15 parts of organic solvents. Gaps of V-shaped structures of the corrugated paper are filled with drying agents. According to the nano-coated waterproof and anti-fouling corrugated carton, a plurality of waterproof layers are adopted, the surface paper and the inner paper are both coated with the nano waterproof and anti-fouling paint, and the nano titanium dioxide which is highly hydrophilic and oleophylic is added into the paint, so that the waterproof and anti-fouling capacity of the paperboard can be improved; and the V-shaped wavy structures of the corrugated paper are filled with the molecular sieve drying agents, and thus the waterproof capacity of the paperboard is further improved.

The invention discloses a preparation method of an in-situ self-assembling N-doped super-hydrophilic carbon aerogel supercapacitor electrode material. The preparation method comprises the steps of introducing an N-containing conducting polymer and a borate radical framework in a gel three-dimensional net structure, and preparing a super-hydrophilic high-capacitance N-doped carbon aerogel supercapacitor electrode material which is of a porous structure after high-temperature activating, wherein N plays dual functions of increasing pseudocapacitance of the material and increasing the electronic transmission capacity, and borate radical ions are not only used as a cross-linking agent for maintaining a gel framework, but also have the effect of a self-assembling template so as to promote the generation of macroporous gaps. According to the preparation method of the in-situ self-assembling N-doped super-hydrophilic carbon aerogel supercapacitor electrode material, disclosed by the invention, excellent super-hydrophility can be shown without treatment of ultraviolet irradiation, or additional surface chemical modification and the like; solvent exchange needs not to be adopted, a freeze drying technology is used, the cost is low, the preparation method is simple and easy, the special three-dimensional net structure in gel is maintained, and environment friendliness is realized.

The invention relates to a medical beta-titanium alloy composite material with osteogenesis inducting activity and a preparation method thereof. The material comprises a base material and a titanium oxide nano-tube array layer, which is generated in-situ and attached to the surface of the base material and contains BMP-2 cell growth factors. The base material is a medical beta-titanium alloy of the Ti-25Nb-6Zr-xMo family, wherein the x is between 2 and 5. The diameters of nano-tubes, which are generated in-situ on the alloy surface, are between 30 and 50 nm, the lengths of the nano-tubes are between 200 and 300 nm, and the nano-tubes are arranged in arrays and perpendicular to the surface of the titanium alloy. The medical beta-titanium alloy composite material has ultra-low elastic modulus and is capable of forming better interface mechanic matching with the bone tissue. So osteoblasts grow rapidly along the wall on the surface of medical beita-titanium alloy whose surface is loaded with titanium oxide nano-tube biological composite material containing BMP-2, and proliferate obviously. The composite material has a good effect on inducing osteoblasts to proliferate to form bone matrix and can be used to bone replacement or repairing.

The invention discloses a preparation method of a non-layered cross-linked graphene oxide film. The preparation method comprises the following steps: firstly mixing poly-ammonia or an amino-terminated polymer with a graphene oxide water dispersion solution; uniformly dispersing to form graphene oxide sol; dropwise adding the graphene oxide sol into a substrate; and hermetically arranging at the temperature of 70 to 90 DEG C to obtain the non-layered cross-linked graphene oxide film. In the non-layered cross-linked graphene oxide film prepared by the method disclosed by the invention, a graphene oxide nanometer plate layer is formed by crosslinking the poly-ammonia and the amino-terminated polymer and is in irregular disordered orientation; the non-layered cross-linked graphene oxide film has super-hydrophilic properties and super-oleophobic properties underwater, high throughput and good pollution resistance and is suitable for separation of oil and water emulsion at normal pressure.

The invention discloses a super-hydrophilic anti-fog coating for glass. The coating is prepared from alkaline silicate, silica sol, a silane coupling agent, a thickener, a defoamer and the like. By taking super-hydrophilic alkaline silicate and silica sol as main raw materials, the super-hydrophilic, atomization-resistant, long-durable, highly water-resistant and high-hardness super-hydrophilic anti-fog coating for glass capable of being cured at normal temperature is prepared by virtue of compound reactions. The process is simple, low in cost and environment-friendly; the operating conditions are easily controlled, the problem that the existing coating is poor in atomization-resistant effect and durability and complex in preparation process is solved, the application and development of a super-hydrophilic technique are promoted.

The invention discloses a hydrogel coating with a long-term antibacterial function and a preparation method thereof. The method comprises the following steps that 1, pre-treatment is conducted on a base material; 2, at room temperature, the base material subjected to pre-treatment is placed in a polycation electrolyte solution and a mixed solution of a polyphenol compound and an antibacterial medicine in sequence, and after reaction is carried out in a polyanion electrolyte solution for 5-20 min, washing is conducted for 3-5 times; 3, operation of step 2 is repeated for 5-20 times to obtain the hydrogel coating. The method is simple and convenient to operate and cheap in raw material, and the prepared hydrogel coating has good biocompatibility and excellent antibacterial performance; the hydrogel coating has good medicine loading capacity and stable medicine releasing performance, and can be used for preparing and modifying cardiovascular implant endovascular devices, orthopedics filling materials and antibacterial wound dressings.

The invention provides a high-potential super-hydrophilic polypeptide monolayer film and preparation method and application thereof. The polypeptide is composed of polypeptide molecules with the molecular weight of (1.48 + / - 0.2)*10 < 5 >g / mol, the thickness of a single-layer film is 13.8-14.9 nm, the exposure amount of primary amino groups on the surface of the film is 12-14%, the Zeta potentialof the polypeptide single-layer film is -1-5 mV, and the contact angle of the film is 10 + / - 1 degrees. As a surface coating material of a cardiovascular stent, the material is applied to treatment ofcardiovascular diseases, and the super-hydrophilic property can enable a layer of hydration film to be formed on the surface of the material so as to effectively prevent protein adsorption. The surface high potential can improve the cell adhesion, proliferation and differentiation capacity.

The invention discloses a preparation method of a super-hydrophilic anti-fogging oxidized graphene coating. The preparation method comprises the following steps: taking graphene micro powder as a raw material, adopting a wet chemical oxidation method to prepare oxidized graphene dispersion liquid, and carrying out filtration, rinsing, ultrasonic dispersion and centrifugal separation to obtain the super-hydrophilic anti-fogging oxidized graphene coating. In addition, the invention further discloses a method of adopting the coating to prepare a super-hydrophilic anti-fogging oxidized graphene coating layer. The preparation method disclosed by the invention is simple in technology, low in cost, green and environment-friendly, and easy in operating condition control. The obtained oxidized graphene coating is excellent in performance, wide in application range, and capable of being applied to relatively transparent common glass or organic transparent carrier. The prepared super-hydrophilic anti-fogging oxidized graphene coating layer has the excellent characteristics of super-hydrophilicity, anti-fogging property, high strength, long durability, high transmission of light and the like. The preparation method of the super-hydrophilic anti-fogging oxidized graphene coating effectively solves the problem that the existing coating layer is poor in anti-fogging effect and durability, and is favorable to promote application and development of the super-hydrophilic technology.

The invention discloses a composite fibrous membrane having hydrophobic / hydrophilic wettability difference and a preparation method thereof and belongs to the technical field of functional micro-nano composite fibrous materials. The composite fibrous membrane is provided with two fibrous membrane layers. Firstly, an electrostatic spinning solution A serves as a precursor solution to prepare the fibrous membrane PAN-I by adopting an electrostatic spinning method, a heat treatment method is combined to make the fibrous membrane PAN-I have hydrophobicity; then, an electrostatic spinning solution B serves as a precursor solution to prepare the fibrous membrane PAN-II, and then a receiving substrate is stripped to obtain the composite fibrous membrane. The preparation method is simple, low in energy consumption and high in efficiency. The fiber diameter of the composite fibrous membrane can be controlled by adjusting process parameters. Compared with simple hydrophobic or hydrophilic micro / nano fibrous membrane material, the composite fibrous membrane has efficient water drop capture and collection capability under the driving of hydrophobic / hydrophilic difference and can be used in the fields of water collection or mist collection from the air and the like.

The invention discloses a method for preparing an ultra-hydrophilic transparent titanium dioxide nano film. The film prepared by the method is about 220nm and transparent and possesses ultra-hydrophilic property without ultraviolet irradiation due to low-temperature annealing; and the film is formed by nano particles which are evenly distributed and have a size of 30 to 45nm, and the crystal structure of the film is anatase phase TiO2. The nano film of the invention can be used in various atomization proof fields such as building glass, automobile rear view mirrors, windshield glass, bathroomglass and the like.

The invention discloses a preparation method of a demulsifier functionalized oil-water separation membrane. The preparation method comprises the following steps: (1) putting styrene / maleic anhydride (SMA) and polyethyleneimine polyoxypropylene polyoxyethylene polyether (PEIPPOPEO) into a flask according to a certain ratio. Amphiphilic SMA-g-PEIPPOPEO is prepared, polytetrafluoroethylene is selected as a base material, and polytetrafluoroethylene is blended with the SMA-g-PEIPPOPEO to prepare a membrane so as to obtain the superhydrophilic polymer membrane with a demulsification effect. demulsifier functionalized oil-water separation membrane is of an asymmetric structure, comprises a compact skin layer, a finger-shaped middle layer and a spongy bottom layer structure, has an excellent separation performance on an oil-water emulsion with a stable emulsifier, has a good reuse performance in the use process, and can be applied to the fields of oil-water separation, offshore oil leakage and the like.

The invention provides a super-hydrophilic and under-water super-oleophobic ceramic film. A porous ceramic film is used as a substrate; nanometer cylindrical titanium dioxide is arranged on the surface of the substrate; a titanium dioxide nanometer array is formed. The static contact angle of the ceramic film structure on water is smaller than 10 degrees; the contact angle on oil under the water is greater than 150 degrees; the ceramic film can be used as an oil water separation film; an excellent oil-water separation effect and fouling resistance effects are achieved. The invention also provides a method for preparing the super-hydrophilic and under-water super-oleophobic ceramic film. According to the method, firstly, a metal titanium plating layer is prepared on the surface of the porous ceramic film as the substrate; then, an oxidizing solution prepared from oxyful, nitric acid and melamine is used for oxidization; the ceramic film with the titanium dioxide nanometer array is obtained. The method is simple; the implementation is easy; the obtained ceramic film has the super-hydrophilic and under-water super-oleophobic performance.

The related preparation method for silatitan hydrophilic film with micro coarse structure comprises: (1) stirring and adding at least one of TiCl4, Ti(SO4)2 or butyl titanate into the alcohol solution to obtain the initial titanium solution; (2) stirring and dripping the mixture of deionized water and acid into organic silicane to obtain organic silica sol; (3) mixing former products for composite sol; (4) forming film on substrate surface, then thermal treating. This product has strong and persistent hydrophilicity on light lumination and well wearing resistance for wide application.

A preparation method of a graphene / nanofiber hybrid gel membrane with a photo-thermal conversion function relates to a preparation method of a graphene / nanofiber hybrid gel membrane. The invention aims to solve the problem that existing photo-thermal conversion materials have low evaporation velocity and low photo-thermal conversion efficiency during the seawater desalination process. The preparation method comprises the following steps: 1, preparation of gel fiber; 2, preparation of graphene oxide sheets; and 3, preparation of the hybrid gel membrane. The preparation method is used for preparation of the graphene / nanofiber hybrid gel membrane with the photo-thermal conversion function.

The invention provides a preparation method of a superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane. The method includes the steps of: (1) adding a calcium ion solution into an alginate solution to prepare calcium alginate gel, and performing stirring treatment on the gel to form flocculent precipitate; (2) under stirring, adding a carbonate solution into the material obtained by step (1) to obtain calcium carbonate-calcium alginate hybrid particles; and (3) conducting pumping filtration and drying on the material obtained by step (2), thus obtaining the superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane. The invention also provides the hybrid membrane prepared by the method and application thereof in the oil-water separation field. The hybrid membrane provided by the invention has good flexibility and mechanical strength, very low adhesive force to oil stain, and very strong pollution resistance, and can realize oil-water separation of high viscosity crude oil and oil-water emulsion. The hybrid membrane also has the advantages of simple preparation, low cost, green and no pollution, and recyclability, and is expected to realize large-scale production and application.

The invention discloses a titanium heat exchanger for an air conditioner, and a processing method thereof. The titanium heat exchanger comprises a heat exchange pipe and cooling fins. The surface of each cooling fin is provided with a TiO2-containing titanium coating, the titanium coating contains CuO and Ag2O, the mass percentage of CuO is 10%-15%, and the mass percentage of Ag2O is 10%-15%. When the light is sufficient, the titanium coating of the heat exchanger is decomposed under the photochemical catalysis of the ultraviolet light, and various organics attached on the titanium oxide surface are removed. When the light is insufficient, titanium oxide also can make the internal electrons excited to generate hydroxyl atomic groups and hydrogen peroxide under the action of nano silver and nano copper, so as to decompose the organics. Therefore the heat exchanger has long-term and stable effect of anti-bacterial and mildew-removal.

The invention relates to a Ru-based catalyst for preparing cyclohexene through partial hydrogenation of benzene and a modification method of the Ru-based catalyst. The Ru-based catalyst comprises Ru-based particles and a SiO2 layer, wherein the Ru-based particles are coated with the SiO2 layer, a core-shell catalyst is formed, and the thickness of the SiO2 layer is 0.5-2 nm; the Ru-based particles are the Ru-based catalyst. With the adoption of the Ru-based catalyst for preparing cyclohexene through partial hydrogenation of benzene and the modification method of the Ru-based catalyst, the condition that cyclohexene generated in the partial hydrogenation process of benzene is adsorbed to the surface of the catalyst again and is subjected to deep hydrogenation to generate cyclohexane is prevented on the basis of the difference of dissolution and diffusion properties of benzene and cyclohexene in a retained water membrane, the activity of the Ru-based catalyst before coated with SiO2 and the activity of the Ru-based catalyst after coated with SiO2 under the same hydrogenation condition are not remarkably influenced, the yield of a target product cyclohexene can be increased by 15%-20% or higher, and the Ru-based catalyst has a wider application range.