24 results about "Hydrophobic surfaces" patented technology

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.

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.

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.

This invention discloses a high-efficiency waterproof and breathable membrane and its preparation method. The preparation method includes the following steps: preparing a casting solution containing an aqueous polymer and deionized water; directionally freezing the casting solution to allow the deionized water to grow into ice crystals along a single temperature gradient direction; then freeze-drying the ice crystals to sublimate them, obtaining a core membrane with a vertically arranged and interconnected channel structure; and forming hydrophobic surface layers on both surfaces of the core membrane to obtain the high-efficiency waterproof and breathable membrane. This invention, by constructing a synergistic structure of a core layer with vertically ordered interconnected channels and an ultra-thin, ultra-hydrophobic surface layer, achieves high mechanical strength while ensuring efficient water vapor permeability and durable liquid water barrier, significantly improving breathability, waterproofness, and durability.

Treated, transportable ISO tanks include an interior metal surface and a hydrophobic surface layer applied thereto, directly or through an intermediate layer. The surface layer comprises a self-assembled monolayer prepared from a fluorinated material having the structure:wherein A is an oxygen radical or a chemical bond; n is 1 to 20; Y is H, F, CnH2n+1 or CnF2n+1; X is H or F; b is at least 1, m is 0 to 50, p is 1 to 20, and Z is an acid group or an acid derivative. Also, a method of reducing deposition of a friction reducer on a surface of an apparatus that stores or transports the same, includes contacting the surface with the above fluorinated material in a diluent, directly or through an intermediate layer; forming a film on the surface; and introducing the friction reducer therein.

The application discloses a kind of upper and lower layered impact-resistant super-hydrophobic surface micro-nano structures, including substrate and the composite structure layer being set on the substrate, the composite structure layer includes upper layer open structure and lower layer closed structure;The upper layer open structure includes the protrusion type microstructure unit array;The lower layer closed structure includes the closed microstructure unit array;The bottom height of the upper layer open structure is not less than the opening end height of the lower layer closed structure.The application is by open protrusion structure being set in upper layer, closed recess structure is set in lower layer and height relationship is limited, static liquid drop only contacts upper layer to realize low adhesion, under dynamic impact, lower layer structure intercepts three-phase line and uses trapped air layer to convert impact energy, so as to give consideration to the static super-hydrophobic performance of structure and dynamic impact-resistant performance.

A surface-modified aluminum nitride powder and its manufacturing method are disclosed. The surface-modified aluminum nitride powder comprises an aluminum nitride body having a hydrophobic surface and a coating layer located on the hydrophobic surface and covering the aluminum nitride body. The coating layer comprises an anionic surfactant. The manufacturing method of the surface-modified aluminum nitride powder comprises contacting the aluminum nitride body with an organic acid solution to form a hydrophobic surface on the surface of the aluminum nitride body; and contacting the anionic surfactant with the hydrophobic surface to form a coating layer on the hydrophobic surface to obtain the surface-modified aluminum nitride powder.

The present application relates to the technical field of aluminum and aluminum alloy anodic oxidation film surface treatment, and discloses an aluminum alloy anodic oxidation film sealing agent with sealing and hydrophobic functions and application thereof, which is composed of the following components: magnesium acetate, ammonia organic acid, ammonia surfactant, corrosion inhibitor, pH buffer and water. The present application uses magnesium acetate as the main sealing material, and ammonia organic acid and ammonia surfactant are used in synergistic action to realize efficient sealing of the anodic oxidation film and simultaneously build a hydrophobic surface, and the obtained film layer has a water drop angle of > 110°. The sealing agent uses water as the solvent, does not contain volatile organic compounds (VOC), heavy metal ions and toxic and harmful substances such as formaldehyde, has long-term hydrophobicity and excellent corrosion resistance, is environmentally friendly and harmless, has low cost, and is simple to operate, and is suitable for protective treatment of aluminum alloy anodic oxidation film.

This invention provides an ultrathin vapor chamber based on an asymmetric capillary structure with a wettability gradient, and relates to an improved method for an ultrathin vapor chamber with an asymmetric distribution of hydrophilic-phobic composite capillary structures. The vapor chamber includes a sealed, flat cavity filled with a working fluid. Its innovation lies primarily in the construction of the capillary structures distributed on the upper and lower shell plates of the cavity. The upper shell plate comprises a hydrophilic surface with superhydrophilic microstructures exhibiting strong capillary forces, while the lower shell plate comprises a smooth hydrophobic surface without capillary structures and a hydrophilic surface with superhydrophilic microstructures exhibiting strong capillary forces. The superhydrophilic microstructures with strong capillary forces are uniformly distributed on the surface of the upper shell plate, while those on the lower shell plate are distributed in the edge region of the plate surface, with the central region being a smooth hydrophobic surface without capillary structures, forming a wettability gradient structure. Compared to traditional ultrathin heat spreaders with uniformly symmetrical capillary structures, this invention designs a continuous wettability gradient in the lower shell plate, allowing steam to rise vertically without obstruction in the central region. Meanwhile, the condensate formed by steam condensation flows back laterally efficiently through the superhydrophilic structure at the edge of the lower shell plate. During the gradual change of capillary force, the paths of steam and liquid are separated, thus achieving the synergy of steam diffusion and liquid reflux within a single thin cavity.

The application discloses a surfactant and a preparation method and application thereof, and the surfactant comprises at least one cationic single-head double-tail surfactant shown in the following formula A and at least one diacid compound shown in the following formula B. The application realizes differential deposition of the surfactant when impacting different plant hydrophobic surfaces by precisely regulating aggregate phase behavior of the cationic single-head double-tail surfactant shown in the formula A and the diacid compound shown in the formula B and utilizing the subtle difference of hydrophobicity of crop and weed leaves at different growth stages. Formula A HOOC-(CH2) n -COOH Formula B

This invention belongs to the technical field of precast concrete components, specifically relating to a lightweight, hydrophobic, frost-resistant fly ash-based precast component, its preparation method, and its applications. The precast component comprises a filling core layer, a matrix layer enclosing the filling core layer, a hydrophobic surface layer enclosing the matrix layer, and pre-sealed pre-drilled holes; the pre-drilled holes penetrate one side of the matrix layer and the hydrophobic surface layer; the hydrophobic surface layer is made of stearic acid-modified bentonite, cement, mineral powder, and water, with a water-cement ratio of 0.1~0.3; the matrix layer is made of cement, fly ash, silica fume, stone chips, water-reducing agent, and water, with a water-cement ratio of 0.1~0.3; the filling core layer is composed of one or more of fly ash, red mud, and sawdust. The flexural and compressive strengths of this precast component are comparable to those of cement precast components of the same specifications, but its density is significantly reduced, its water absorption is low, and its frost resistance and salt-freezing resistance are greatly improved, achieving efficient utilization of solid waste.

This invention provides a liquid crystal polymer composition that, when sliding between a liquid crystal polymer molded body and a metal material, can suppress the coefficient of friction to a low level in any situation, both in the initial stage of sliding and after repeated sliding. The liquid crystal polymer composition of this invention comprises a liquid crystal polymer (A), a first inorganic filler (B1), a second inorganic filler (B2), and a solid lubricant (C). The surface of the first inorganic filler (B1) is provided with a treatment layer composed of a hydrophilic surface treatment agent, and the surface of the second inorganic filler (B2) is provided with a treatment layer composed of a hydrophobic surface treatment agent.

The application discloses strontium ion doped carbon quantum dots, a synthesis method thereof and antibacterial use, and directly synthesizes strontium ion doped carbon quantum dots with a hydrophobic surface through a solvothermal method in one step. The preparation process is simple, the cost is low, and large-scale production can be realized. The antibacterial coating has excellent antibacterial performance.

This application provides a method, system, and storage medium for simulating interfacial hydrophobicity based on statistical thermodynamics and modified DLVO theory. The method first obtains flotation process parameters; then defines the water molecule ligand structure and energy state at the hydrophobic interface; the bulk phase of the hydrophobic interface is set as the first boundary condition, and the innermost edge closest to the hydrophobic interface is set as the second boundary condition. Combining the hydration of ions and water molecules, the ion distribution is calculated. The contact angle parameters of the innermost interface ligands and the interfacial potential, which change due to ion adsorption, are corrected. The hydrophobic surface potential and double-layer structure are corrected according to ion-induced theory, and the macroscopic physical properties of the interface after hydrophobic correction are calculated. The flotation effect under the parameter conditions is obtained based on the macroscopic physical properties of the interface. This calculation method can quantitatively analyze and numerically simulate interfacial interactions during flotation, providing a theoretical basis for process control in flotation practice.

This invention discloses a multi-dimensional composite photothermal hydrophobic anti-icing coating and its preparation method. The coating comprises a flexible hydrophobic matrix and a photothermal material uniformly dispersed within the flexible hydrophobic matrix; the flexible hydrophobic matrix is ​​a polydimethylsiloxane (PDMS) matrix; the photothermal material is a ternary composite photothermal material comprising titanium nitride (TiN), carbon nanotubes (CNTs), and MXene, with a silanized surface; wherein the mass ratio of TiN, CNTs, and MXene is (0.5–2):(0.5–2):(0.5–1). This coating enhances photothermal performance through broad-spectrum light absorption and a highly efficient thermally conductive network. Simultaneously, based on multi-scale effects, surface roughening results in a robust hydrophobic surface, integrating efficient photothermal de-icing and passive hydrophobic anti-icing functions, and exhibiting excellent durability. The preparation method includes material modification, composite coating preparation, coating, and curing steps; the process is simple and easily scalable.

The present invention relates to a liquid resistant multilayer sheet paper or paperboard comprising: a cellulose-based back ply, wherein the back ply comprises at least two different internal sizing agents in a total amount of 2 - 10 kg / ton, based on the total dry weight of the back ply; a cellulose-based top ply, wherein the top ply comprises a single internal sizing agent in a total amount of 0.1 - 5 kg / ton, based on the total dry weight of the top ply, and wherein the total amount of internal sizing agent in the top ply is lower than the total amount of internal sizing agent in the back ply; and a first surface sizing layer applied on the outermost surface of the back ply, wherein the first surface sizing layer has a coating weight of 0.5 - 3 g / m 2 and comprises at least one hydrophobic surface sizing agent and at least one binder. The present invention also relates to a method of manufacturing a liquid resistant multilayer sheet paper or paperboard.