131 results about "Hydrophobic surfaces" patented technology

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention belongs to the technical field of vehicle protection materials, and particularly relates to a coating for an explosion-proof vehicle. The coating is composed of an adhesion bottom layer, an energy-absorbing middle layer and an anti-impact outer layer, wherein the adhesion bottom layer contains epoxy resin and flaky zinc powder / mica powder, and a laminated shielding structure is formed to improve the adhesion force to be larger than or equal to 8 MPa; the energy-absorbing middle layer is a composite material of modified nano silicon dioxide / polyethylene glycol-based STF and silanized aramid fiber, the viscosity of the energy-absorbing middle layer is sharply increased by more than 50 times at the strain rate of 500s <-1 >, and 65% of explosion impact energy can be absorbed; the anti-impact outer layer adopts a polyurea elastomer to wrap gradient distribution silicon carbide microspheres, pyramid-shaped protrusions are designed on the surface, the fragment defense speed reaches 430 m / s, and the shock wave reflection dispersion is increased by 50%. The whole anti-explosion coating passes UL94V-0 certification through a synergistic flame-retardant system, the chemical protection and self-cleaning capacity is improved through a super-hydrophobic surface layer, and the problems that a traditional anti-explosion coating is poor in adhesive force, weak in composite threat resistance and insufficient in environmental adaptability are solved.

The invention relates to a method for constructing a composite super-hydrophobic coating through double bonding. The preparation method comprises the following steps: taking a clean copper sheet which is not pretreated as a substrate, dipping the copper sheet in a suspension consisting of nanoparticles and sulfydryl-containing siloxane ethanol, taking out, washing, drying, dipping in a perfluoromercaptan ethanol solution, taking out, washing, and drying to obtain the copper-based super-hydrophobic surface coating. The coating prepared by the method has excellent super-hydrophobicity, icing resistance and stability. Different from an existing conventional preparation method, the method has the advantages that pretreatment operation such as abrasive paper polishing, strong acid etching or anodic oxidation does not need to be carried out on a copper sheet, and micro-nano roughening and low-surface-energy self-assembly can be completed on the copper surface only through two-step normal-temperature dipping. The method is simple in preparation process, mild in condition, free of expensive equipment, thin in coating thickness and small in influence on electric conduction and heat conduction of the copper substrate, intrinsic performance of copper can be reserved, the electric conduction / heat conduction characteristic of the copper substrate is considered, and the method has wide application value and prospects.

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.

The present disclosure provides a full-dimensional hydrophobic radiation refrigeration cement coating and a preparation method thereof. The main raw materials of the coating are cement, functional fillers, micron / nanofibers, hydrophobic components and water. Unlike conventional hydrophobic surface paint which only has surface hydrophobic self-cleaning function, the full-dimensional hydrophobic radiation refrigeration cement coating of the present disclosure integrates radiation refrigeration and full-dimensional hydrophobicity, and can still maintain excellent self-cleaning and radiation refrigeration performance even after abrasion. The coating has a contact angle with water greater than 150°, and the overall reflectivity and overall infrared emissivity of the atmospheric window are both above 90%.

This invention provides a method for constructing boundary conditions for a superhydrophobic cylindrical surface based on OpenFOAM, comprising the following steps: (1) reading the parameter setting file; (2) obtaining the position of the center of the cylindrical surface; (3) finding the position of the center of the first layer of grid near the cylindrical surface and its tangential velocity; (4) finding the position of the center of the second layer of grid near the cylindrical surface and its tangential velocity; (5) calculating the sum of the distances between the center of the cell and the center of the cylindrical surface; (6) calculating and updating the velocity of the cylindrical surface; (7) performing flow numerical simulation, repeating S2~S7 until the calculation is completed. This invention is based on OpenFOAM and has been further developed to construct a superhydrophobic surface boundary condition suitable for flow around a cylinder. This boundary condition supports parallel computation of the entire calculation process, improving computational efficiency and the scale of the problem solution.

An apparatus for forming a plurality of microdroplets from a droplet includes a substrate, a dielectric layer on the substrate and having a plurality of hydrophilic surface regions spaced apart from each other by a hydrophobic surface, and a plurality of electrodes in the dielectric layer. The electrodes are configured to form an electric field (E) across the droplet in response to a voltage provided by a control circuit to move the droplet across the dielectric layer in a lateral direction (F) while leaving portions of the droplet on the hydrophilic surface regions to form a plurality of microdroplets on the hydrophilic surface regions.

A biomimetic desert beetle self-transporting bone microgrinding head and a preparation process thereof, and relates to the field of medical instruments. The microgrinding head includes a hydrophobic matrix or a matrix having a hydrophobic plating layer. The matrix has a hydrophobic surface on which several hydrophilic abrasive particles are uniformly distributed. A process for preparing the microgrinding head is: selecting diamond abrasive particles and conducting oxidization treatment of the diamond abrasive particles; forming a hydrophobic matrix by scanning a surface of the matrix with a laser; or alternatively obtaining a hydrophobic plating layer by a chemical modification method; and combining the oxidized diamond abrasive particles with the hydrophobic matrix or the hydrophobic plating layer by electroplating to obtain a microgrinding head. The microgrinding head utilizes to achieve an effect of being capable of cooling rapidly and capturing cooling medium droplets and effectively transporting the droplets to a grinding arc region.

The application discloses a kind of oil-containing water body separation membrane for refining process of Bupleurum volatile oil and preparation method and application.The preparation method of the application is first mixed and dissolved according to proportion with cellulose acetate and cellulose nitrate powder, form casting membrane liquid, and the base membrane is prepared using non-solvent phase conversion method;Second, the film is deacetylated;After that, it is soaked in acyl chloride n-hexane solution for crosslinking;Finally, by in-situ hydrolysis of silane coupling agent on the membrane surface, a hydrophobic surface is prepared, and an oil-containing water body separation membrane for refining process of Bupleurum volatile oil is obtained.This method forms a hydrophobic layer on the surface of the membrane, which strengthens the rapid passage of Bupleurum volatile oil molecules and inhibits the penetration of water;Using the oil-containing water body separation membrane avoids the formation of emulsion during oil-water separation, showing high separation efficiency and stability, and widening the application of cellulose acetate membrane in traditional Chinese medicine preparation process.

Embodiments herein describe techniques for an IC package including a supporting layer having a first zone and a second zone. An electronic component is placed above the first zone of the supporting layer. An underfill material is formed above the first zone of the supporting layer, around or below the electronic component to support the electronic component. The second zone of the supporting layer includes a base area and multiple micro-pillars above the base area, where any two micro-pillars of the multiple micro-pillars are separated by a gap in between. The second zone has a hydrophobic surface including surfaces of the multiple micro-pillars and surfaces of the base area. The second zone is a keep out zone to prevent the underfill material from entering the second zone. Other embodiments may be described and / or claimed.

The invention relates to the technical field of high-voltage insulation, and particularly discloses a high-voltage bushing with a self-cleaning hydrophobic surface and a preparation method thereof.The preparation method comprises the steps that the outer insulation surface of the high-voltage bushing is subjected to cleaning and activation pretreatment; a coating composition containing a low-surface-energy polymer adhesive and a functional filler subjected to hydrophobic treatment is uniformly applied to the surface of the pre-treated sleeve in a spraying manner and the like; and finally, a firmly combined functional coating is formed on the surface of the sleeve through curing treatment. The invention further provides the high-voltage bushing prepared through the method, the pollution flashover resistance of the bushing can be remarkably improved, the surface self-cleaning effect can be achieved by means of rain wash, the operation and maintenance workload is greatly reduced or eliminated, and the high-voltage bushing is particularly suitable for power equipment operating in the outdoor high-pollution and high-humidity severe environment.

The invention discloses an aero-engine drainage fan based on hydrophilic and hydrophobic surface characteristics. Hydrophilic and hydrophobic stripe surfaces are arranged on the inner wall face of a fluid director and / or a fan casing and / or a stator casing at intervals. The drainage structure is arranged on the inner wall surface of the fluid director and the bottom of the inner wall surface of the fan casing and / or the stator casing; when rain and fog are sucked into an engine, are in a liquid drop state under the centrifugal action and enter a fan along the inner wall surface of a casing, three intersection interfaces exist, and liquid drops obtain surface tension opposite to the air inlet direction by utilizing different contact angles between the hydrophilic and hydrophobic surfaces and the liquid drops at intervals, so that the liquid drops are prevented from moving along the air inlet direction and finally attached to the hydrophilic surfaces; meanwhile, under the action of gravity, the liquid drops move towards the drainage structure along the inner wall surface and are discharged out of the fan through the drainage channel or the drainage hole. And the water inlet amount of the engine in rainy and foggy weather can be effectively reduced, the pneumatic stability of a gas compressor and the combustion temperature of a combustion chamber are guaranteed, the anti-corrosion effect can be achieved, the reliability of the engine is improved, and the service life of the engine is prolonged.

Provided in the embodiments of the present application are a wafer drying method and device. After a wafer is cleaned with a cleaning solution, the surface of the wafer has a residue of the cleaning solution. The method comprises: spraying a first liquid mutually soluble with the cleaning solution onto the wafer until the cleaning solution on the surface of the wafer is cleaned, resulting in the surface of the wafer having a residue of the first liquid; introducing a set amount of a first drying gas into a cavity, and spraying a modifying chemical solution onto the wafer at the same time, wherein the modifying chemical solution is mutually soluble with the first liquid and changes the surface of the wafer into a hydrophobic surface; and spraying a second drying gas onto the wafer. The wafer drying method and device of the present application can dry a wafer.

The invention discloses a super-hydrophobic surface self-cleaning design method based on molecular dynamics simulation, relates to the technical field of super-hydrophobic surface self-cleaning and nanofluid, and discloses a process of impinging deposited liquid drops on a molecular level based on molecular dynamics (MD) simulation. By exploring the influence of various parameter groups, Weber number (We), droplet size ratio (0.5 < = delta < = 2) and wettability (theta0), the results of deposition, regular rebound, closed pore rebound, rupture rebound and the like are systematically mapped to a series of phase diagrams, so that the process of impacting deposited droplets by droplets wrapped with nano-particles is simulated; and parameters such as the droplet size ratio, the Weber number and the surface wettability are optimized by analyzing the dynamic behavior and the energy conversion mechanism of droplet collision, so that the deposited droplets are efficiently and quickly removed. The method is suitable for the fields of micro-nano systems, anti-icing coatings, self-cleaning surfaces and the like, and has the advantages of being flexible in design, low in energy consumption and high in cleaning efficiency.

The invention discloses an anticorrosive coating as well as a preparation method and application thereof, and relates to the technical field of high polymer materials and metal corrosion protection. The anticorrosive paint comprises the following components which are independently subpackaged: a component A: an epoxy resin prepolymer; component B: an epoxy resin curing agent, wherein the epoxy resin curing agent comprises an amino curing agent; component C: a functional molecule, wherein the functional molecule comprises alpha-lipoic acid. The coating has an innovative self-layering structure, so that the coating has a lotus leaf effect-like hydrophobic surface and super glue-like base layer adhesion at the same time, and the contradiction that the hydrophobicity and the adhesion force of a traditional coating are difficult to consider at the same time is solved. The existence of the dynamic disulfide bond not only endows intelligent release and potential self-repairing functions, but also provides possibility for degradation and chemical recovery of the coating material after the life cycle is ended, and conforms to the concepts of green chemistry and sustainable development.

The application provides a super-hydrophobic long-acting anti-fouling glaze and a preparation method and application thereof. The double-layer super-hydrophobic long-acting anti-fouling glaze is composed of a nano super-hydrophobic surface layer and a ceramic face glaze bottom layer, the ceramic face glaze bottom layer is formed by spraying ceramic face glaze material, and the nano super-hydrophobic surface layer is formed by spraying nano super-hydrophobic glaze slurry on the ceramic face glaze bottom layer within 5 minutes after spraying; wherein the core component of the nano super-hydrophobic glaze slurry is fluorocarbon modified nano silicon dioxide powder. The fluorocarbon modified nano silicon dioxide powder obtained through two-step modification is more hydrophobic, is used as the core component of the nano super-hydrophobic surface layer, is matched with a high-temperature fluxing agent and a dispersing agent which are suitable for the ceramic face glaze material, is combined with the ceramic face glaze material through a wet-on-wet process, forms the double-layer super-hydrophobic long-acting anti-fouling glaze, and the glaze has good bending strength and strong anti-fouling capacity.

The invention relates to a preparation method of spherical hexagonal boron nitride particles, and belongs to the technical field of inorganic nonmetal heat-conducting fillers. The invention aims to solve the technical problems that the prior art depends on a spray granulator, the equipment cost is high, and air holes are easily formed in particles due to quick drying. The preparation method comprises the following steps: carrying out ball-milling treatment on hexagonal boron nitride powder through a water medium, and mixing the hexagonal boron nitride powder with an aluminum oxide additive and a water-based binder solution to prepare uniform slurry; extruding the slurry into a hydrophobic container containing liquid paraffin, and dispersing under mechanical stirring to form slurry liquid drops; then transferring the oil phase containing the liquid drops into a hydrophobic flat plate container, and slowly drying and shaping at 20-80 DEG C; and washing with an organic solvent, sieving and drying to obtain the spherical hexagonal boron nitride particles. According to the method, the production cost is remarkably reduced; through the combined action of oil-phase buoyancy and a hydrophobic surface and a controllable slow drying process, internal pores of the particles are effectively reduced, and the spherical filler particles which are good in sphericity degree, compact in structure and uniform in auxiliary agent distribution are obtained.

The invention discloses a preparation method of a super-hydrophobic pressure-temperature dual-mode sensing sponge capable of resisting liquid interference, which comprises the following steps: soaking a polyurethane sponge in an ethanol mixed solution of graphene and ascorbic acid, then soaking in a mixed solution containing pyrrole, SDBS (Sodium Dodecyl Benzene Sulfonate) and ferric trichloride, and drying to obtain the super-hydrophobic pressure-temperature dual-mode sensing sponge. And soaking the sponge in an n-hexane solution of PDMS, and curing to obtain the conductive sponge with the super-hydrophobic surface. The conductive sponge with the super-hydrophobic surface is prepared by adopting a simple solution soaking method, and the method has the advantages that the process is simple and easy to operate, reaction conditions are controllable, raw materials are wide in source and low in cost, and the obtained product is easy to degrade, has lasting and stable super-hydrophobic self-cleaning performance and excellent conductivity and can be applied to various occasions.

The present invention provides a method for manufacturing a spheroid, comprising a step of providing a suspension having one or more biologically related materials dispersed within a biocompatible medium. An amount of hydrophilic material is deposited on a defined area of the super-hydrophobic surface, and droplets of the suspension are bio-printed onto the hydrophilic material located on the super-hydrophobic surface, thereby forming spheroids.

The application belongs to the technical field of wave-absorbing materials, and particularly relates to a corrosion-resistant super-hydrophobic wave-absorbing coating and a preparation method thereof, which comprises sequentially spraying an epoxy wave-absorbing bottom layer and a fluorocarbon super-hydrophobic surface layer on a substrate, and the specific steps comprise: (1) preparation of a core-shell structure corrosion-resistant wave-absorbing agent; (2) preparation of the epoxy wave-absorbing bottom layer; (3) preparation of fluorosilane modified micro-nano hierarchical titanium dioxide powder; and (4) preparation of the fluorocarbon super-hydrophobic surface layer. The epoxy wave-absorbing bottom layer and the fluorocarbon super-hydrophobic surface layer synergistically exhibit excellent super-hydrophobic performance, and the excellent super-hydrophobic performance enables the wave-absorbing coating to have excellent corrosion resistance and self-cleaning performance. Meanwhile, the maximum loss intensity of the corrosion-resistant wave-absorbing coating of the application can reach -69.8 dB at 2-18 GHz, and the effective wave-absorbing bandwidth can reach 11.3 GHz. The application has a wide range of applications, and is suitable for being applied to various types of ships and the like in a corrosive marine environment.

A method of preparing Janus nanomaterials (250) includes dispersing a chitosan template (210) in an aqueous solution, adsorbing a first portion of a surface of a nanomaterial (220) on the chitosan template (210), functionalizing a second portion of the surface of the nanomaterial (220) so that the second portion includes a hydrophobic surface functionality (230), and releasing the nanomaterial (220) from the chitosan template (210), thereby providing the nanomaterial with asymmetric surface functionalities where the first portion includes a hydrophilic surface functionality and the second portion includes the hydrophobic surface functionality. A method also includes introducing an enhanced oil recovery fluid including Janus nanomaterials (250) from a chitosan template (210) so that the Janus nanomaterials (250) include a hydrophilic surface functionality (230) and a hydrophobic surface functionality, displacing hydrocarbons from the hydrocarbon-bearing formation after introducing the enhanced oil recovery fluid with the Janus nanomaterials (250), and recovering the hydrocarbons.

A method of preparing Janus nanomaterials includes dispersing a chitosan template in an aqueous solution, adsorbing a first portion of a surface of a nanomaterial on the chitosan template, functionalizing a second portion of the surface of the nanomaterial so that the second portion includes a hydrophobic surface functionality, and releasing the nanomaterial from the chitosan template, thereby providing the nanomaterial with asymmetric surface functionalities where the first portion includes a hydrophilic surface functionality and the second portion includes the hydrophobic surface functionality. A method also includes introducing an enhanced oil recovery fluid including Janus nanomaterials from a chitosan template so that the Janus nanomaterials include a hydrophilic surface functionality and a hydrophobic surface functionality, displacing hydrocarbons from the hydrocarbon-bearing formation after introducing the enhanced oil recovery fluid with the Janus nanomaterials, and recovering the hydrocarbons.

The present application relates to the technical field of anti-icing functional surface material, and particularly relates to a ridge structure grid-shaped super-hydrophobic surface for preventing ice and a preparation method thereof.A specific technical scheme is as follows: a ridge structure grid-shaped super-hydrophobic surface for preventing ice, comprising a substrate, the surface of the substrate is coated with a super-hydrophobic coating and is provided with protruding ridge structures, the ridge structures are arranged perpendicularly to each other on the upper surface of the substrate to form a grid shape, and the grid bottom surrounded by the ridge structures is a grid plane.The present application realizes the regulation of the dynamic behavior of the impacting liquid droplets by using the millimeter-level ridge structures which are perpendicular to each other, and this design can not only effectively shorten the contact time at any position on the surface, but also effectively inhibit the accumulation of liquid droplets on the surface at most positions, thereby fundamentally preventing and reducing the surface icing problem.

The invention relates to the technical field of coal seam mining, and provides a nano-based gas desorption agent as well as a preparation method and application thereof. The nano-based gas desorption agent provided by the invention comprises the following components: an organic silicon surfactant, a multi-branched chain surfactant, sucrose fatty acid ester, a modified nano-material, hexanediol and water. The nano-based gas desorption agent provided by the invention can obviously reduce interfacial tension between water and coal seam pore walls and between water and gas bubbles, and is beneficial to easier release of the gas bubbles from tiny pores of a coal seam, so that the methane desorption speed and the permeability rate speed are improved, and the effects of improving the extraction amount and reducing the pre-extraction time are achieved; meanwhile, a hydrophobic surface can be formed on the surface of a reservoir, the thickness of a water film layer is reduced, the water flow resistance under high pressure is reduced, and multiple properties such as interfacial activity, swelling prevention and shrinkage swelling are achieved. Tests show that when the nano-based gas desorption agent is applied to coal mine gas extraction, the gas extraction pure amount can be increased to 200% or above.

The invention belongs to the technical field of communication equipment protection, and particularly relates to a long-life-cycle super-hydrophobic surface modified antenna housing and a preparation method thereof.The surface modified antenna housing comprises an antenna housing body and a functional coating coated on the surface of the antenna housing, and the functional coating comprises a surface layer and a bottom layer directly coated on the antenna housing body from top to bottom; wherein the surface layer is prepared from the following raw materials in parts by weight: 60 to 80 parts of matrix resin, 5 to 8 parts of a nano reinforcing agent, 3 to 8 parts of a cross-linking agent, 30 to 35 parts of organic silicon resin, 0.5 to 1 part of a light stabilizer, 0.3 to 0.5 part of an antioxidant and 120 to 150 parts of a solvent. The surface modified antenna housing prepared by the method has a super-hydrophobic surface and a relatively long service life.

The application relates to a super-hydrophobic surface with a hierarchical fold-back-honeycomb coupling structure and a preparation method and application thereof, the structure of the super-hydrophobic surface comprises a regular hexagonal honeycomb frame structure and a fold-back structure connected with the vertexes of the regular hexagonal honeycomb frame structure; the structure of the fold-back structure comprises a cylinder and a circular chamfered triangular prism connected with the surface of the cylinder. The hierarchical fold-back-honeycomb coupling structure can present excellent super-hydrophobic characteristics; the structure can achieve a physical antibacterial and antifouling function by maximally reducing the actual contact area between liquid drops, microorganisms and the surface. The construction strategy can provide a new design path for the super-hydrophobic surface with antibioadhesion in a marine environment, realizes efficient antifouling, guarantees long-term functional reliability of the surface, and prolongs the service life of marine facilities.

This invention provides a negative pressure, low-energy-consumption aerogel glass and its preparation method, belonging to the field of energy-saving aerogel glass preparation technology. This application involves hydrophobically modifying silica aerogel particles, injecting a silica sol bridging liquid into the contact area between particles to allow it to precipitate and solidify, forming a silica connection structure. This connects the loose particles into an integral skeleton, filling the negative pressure-sealed hollow glass cavity. The hydrophobic surface allows the bridging liquid to precipitate directionally at the particle contact points, avoiding blind spreading and preventing water vapor condensation. The bridging skeleton prevents particle sedimentation and provides channels for uniform negative pressure distribution. The negative pressure inhibits gas heat transfer and, in conjunction with the hydrophobic surface, prevents water vapor condensation. These three factors reinforce each other, forming a synergistic effect. This effectively improves the technical problems of easy particle sedimentation, easy water vapor adsorption, and high heat transfer coefficient in existing aerogel glass, improving the long-term stability and thermal insulation performance of the product.

The invention belongs to the technical field of steel surface modification, and particularly relates to modification treatment liquid for preparing a steel-based super-hydrophobic surface through a chemical deposition method and preparation and application methods of the modification treatment liquid. The molar concentration of the deposition agent in the treating fluid is 0.01-0.1 mol / L; the molar concentration of the modifier in the treating fluid is 0.01-0.1 mol / L; the deposition agent is an inorganic salt, the modifier is a fatty acid organic low-surface-energy substance, and the solvent is a mixture of water and an organic solvent. The method has the advantages that in-situ construction of the micro-nano rough structure on the steel surface and synchronous modification of the low-surface-energy substance are achieved in one step. And the super-hydrophobic surface can be formed only by soaking the steel material, so that the production efficiency is improved, and the equipment investment and energy consumption cost are reduced. The treating fluid can endow common steel and iron materials with super-hydrophobic characteristics, the static contact angle of the obtained surface can reach 150 degrees or above, and the treating fluid has excellent waterproof, anti-icing, anti-fouling and anti-corrosion performance.

According to the super-hydrophobic surface for DNA synthesis and the preparation method of the super-hydrophobic surface, a patterned hydrophobic microstructure and a super-hydrophobic coating are organically combined on the surface, and the surface hydrophobicity is remarkably enhanced. The super-hydrophobic coating is constructed by adopting a two-step method and comprises a hydrophobic resin coating and a silane hydrophobic coating, durability and hydrophobicity are both considered, the hydrophobic coating is not prepared by adopting a common fluorocarbon chain, and a synthetic surface which is efficient, durable, simple in structure and good in biological safety is provided for DNA synthesis.

Embodiments of the present invention are directed to a liquid delivery apparatus. A non-limiting example of the apparatus includes a substrate including a cavity formed in a surface of the substrate. The apparatus can also include a membrane disposed on the surface of the substrate covering an opening of the cavity. The apparatus can also include a hydrophobic layer disposed on the membrane. The apparatus can also include a seal disposed between the membrane and the substrate, wherein the seal surrounds the opening of the cavity. The apparatus can also include an electrode layer coupled to the membrane.