Hydrophobic bionic surface with double-layer structure

Abstract

The utility model belongs to the field of wettability, and particularly discloses a hydrophobic bionic surface with a double-layer structure, which comprises a substrate material, a semi-spinal microarray structure and a columnar array bulge structure, the semi-spine-shaped microarray structure comprises a plurality of semi-spine-shaped microstructures arranged on the surface of the substrate material; the columnar array bulge structure comprises a plurality of columnar bulge structures which are regularly arranged on the surface of the semi-spine-shaped microstructure at preset intervals; the semi-spine-shaped microcosmic array structure and the columnar array protruding structure are arranged on the substrate material, liquid drops on the bionic surface make contact with the columnar microstructures firstly and then partially infiltrate the second-layer semi-spine-shaped structure, the contact angle is well increased when the second-layer semi-spine-shaped structure is in the first-layer semi-spine-shaped structure, the bionic surface is stable in wettability, and therefore the bionic surface is good in wettability. The wetting effect is effectively improved by utilizing the double-layer structure, the structural parameters are accurate and controllable, the wettability can be effectively regulated and controlled, and the development of the field of hydrophobic material preparation is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of wettability, specifically relating to a hydrophobic biomimetic surface with a double-layer structure. Background Technology

[0002] Wettability refers to the spreading behavior of droplets on a solid surface. Factors affecting wettability mainly include the form of the surface microstructure and its chemical composition. The appropriate use of bilayer structures can effectively improve the wetting effect of solids. Wettability can be applied to self-cleaning, oil-water separation, and anti-adhesion. Even on some moisture-sensitive experimental equipment, microstructures can enhance the water resistance and extend the service life of the equipment. Therefore, research on wetting properties such as hydrophobic structures is gradually increasing. Artificial microstructures are mainly manufactured through chemical etching and laser engraving, with different processing methods resulting in variations in texture shape and depth. In recent years, researchers have studied various plant leaves in nature and found that the high hydrophobicity is due to the surface microstructure. For example, lotus leaves, under an electron microscope, exhibit a papillary arrangement, and taro leaves have a hollow hexagonal morphology. These structures often significantly improve wetting effects. Taro leaves possess a micro-nano multilayer structure with needle-like microstructures distributed within the hexagonal structure, further enhancing the wetting effect. Therefore, applying a multilayer structure on top of the basic microstructure is an effective way to improve wetting performance. When preparing hydrophobic materials, the use of a multilayer structure can effectively improve the industrial production requirements and optimize the wetting performance of the materials. Utility Model Content

[0003] The purpose of this invention is to provide a hydrophobic biomimetic surface with a double-layer structure, which is inspired by the morphology of plant leaves to construct a semi-vertebral micromorphology, and on this basis, explores the influence of the double-layer structure on wettability.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A hydrophobic biomimetic surface with a dual-layer structure includes a substrate material, a semi-vertebral microarray structure, and a columnar array protrusion structure; the semi-vertebral microarray structure includes a plurality of semi-vertebral microstructures disposed on the surface of the substrate material; the columnar array protrusion structure includes a plurality of columnar protrusions arranged at a predetermined spacing on the surface of the semi-vertebral microstructure.

[0006] Preferably, the Young's contact angle of the substrate material is 90°, the diameter of the semi-vertebral microstructure is 200 micrometers, and the interval between adjacent semi-vertebral microstructures is 0 micrometers or 10 micrometers.

[0007] Preferably, the columnar protrusions have a width of 5 micrometers, a height of 15 micrometers, and a spacing of 15 micrometers between adjacent columnar protrusions.

[0008] The columnar protrusions are vertical.

[0009] Preferably, the columnar protrusions are symmetrically distributed along the coordinate line on the semi-vertebral microstructure.

[0010] Preferably, the starting position coordinates of the columnar protrusion structure on the adjacent semi-vertebral microstructure with a 0-micrometer spacing are (20, 60).

[0011] Preferably, the starting position coordinates of the columnar protrusion structure on adjacent semi-spine-shaped microstructures with a spacing of 10 micrometers are:

[0012] Preferably, the semi-vertebral microstructure and the columnar protrusion structure have the same geometric size.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention utilizes a double-layer structure consisting of a semi-spine-shaped microarray structure and a micrometer-scale columnar array protrusion structure on a substrate material. Droplets first contact the columnar microstructure on the biomimetic surface, then partially wet the second layer of the semi-spine-shaped structure. The first layer significantly increases the contact angle, resulting in a biomimetic surface with stable wettability. Furthermore, the double-layer structure effectively enhances the wetting effect, and the structural parameters are precisely controllable. This allows for effective regulation of wettability and is beneficial to the development of hydrophobic material preparation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a front view of the present invention;

[0018] Figure 3 This is a schematic diagram of the simulated contact angle of the double-layer hydrophobic biomimetic structure with a 0μm spacing.

[0019] Figure 4 This is a schematic diagram of the simulated contact angle of the double-layer hydrophobic biomimetic structure with a 10μm spacing of the present invention.

[0020] Figure 5This is a schematic diagram of the simulated contact angle of the single-layer semi-spine structure with a 10μm spacing.

[0021] In the figure: 1. Substrate material; 2. Semi-spinal microarray structure; 201. Semi-spinal microstructure; 3. Columnar array protrusion structure; 301. Columnar protrusion structure. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] As attached Figure 1 To be continued Figure 4 As shown:

[0026] Example 1: This example provides a hydrophobic biomimetic surface with a double-layer structure, including a substrate material 1, a semi-spinal microarray structure 2, and a columnar array protrusion structure 3; the semi-spinal microarray structure 2 includes a plurality of semi-spinal microstructures 201 disposed on the surface of the substrate material 1; the columnar array protrusion structure 3 includes a plurality of columnar protrusion structures 301 arranged at a preset spacing on the surface of the semi-spinal microstructure 201.

[0027] Specifically, the Young's contact angle of the substrate material 1 is 90°, the diameter of the semi-vertebral microstructure 201 is 200 micrometers, and the spacing between adjacent semi-vertebral microstructures 201 is 0 micrometers.

[0028] Specifically, the columnar protrusion structure 301 has a width of 5 micrometers and a height of 15 micrometers, and the spacing between adjacent columnar protrusion structures 301 is 15 micrometers.

[0029] Specifically, the columnar protrusions 301 are symmetrically distributed on the semi-vertebral microstructure 201 along the line containing coordinates (100, 0).

[0030] Specifically, the starting position coordinates of the columnar protrusion structure 301 on the adjacent semi-vertebral microstructure 201 with a spacing of 0 micrometers are (20, 60).

[0031] Specifically, the semi-vertebral microstructure 201 and the columnar protrusion structure 301 have the same geometric size.

[0032] Specific appearance as follows Figure 1 , Figure 2 As shown. Based on the established geometric design of the double-layer hydrophobic morphology, corresponding finite element simulations were performed to verify the influence of this double-layer structure on wetting performance. Therefore, the steps to be followed in the finite element simulation are as follows:

[0033] 1. After selecting the fluid module, establish a geometric model, creating a 5000μm × 5000μm structural outline. At the bottom coordinate point 0μm, create a semi-spine-shaped microstructure with a diameter of 200μm, with a spacing of 0μm between the semi-spine-shaped microstructures. After creating the semi-spine-shaped microstructures, create columnar microstructure protrusions on one of the structures. The geometric dimensions of the columnar protrusions are: width 15μm and height 15μm. The starting coordinates of the columnar protrusion structure 301 are 20μm and 60μm when the spacing is 0μm. The spacing between each columnar protrusion is 15μm, and 10-11 columnar protrusion structures 301 are distributed on each semi-spine-shaped microstructure. Using a 2μL water droplet, create a water droplet with a radius of 780μm in the model, with coordinates of 2500μm and 1000μm.

[0034] 2. After establishing the geometric model, the wetting wall angle of the hydrophobic structure is set to 90°. Open boundaries and an outlet are set for the three boundaries other than the structure. The water droplet model material is water at room temperature, surrounded by air. The microstructure is a material with an intrinsic contact angle of 90°. This simulation uses the phase-field method; to ensure accuracy during the simulation, fluid mass conservation should be selected.

[0035] 3. When meshing, the mesh should be refined at the interface between the double-layer microstructure and the water droplet, while the mesh should be appropriately coarsened in the non-water droplet contact areas to improve simulation accuracy and reduce computation time.

[0036] Example 2: This example provides a hydrophobic biomimetic surface with a double-layer structure, including a substrate material 1, a semi-spinal microarray structure 2, and a columnar array protrusion structure 3; the semi-spinal microarray structure 2 includes a plurality of semi-spinal microstructures 201 disposed on the surface of the substrate material 1; the columnar array protrusion structure 3 includes a plurality of columnar protrusion structures 301 arranged at a preset spacing on the surface of the semi-spinal microstructure 201.

[0037] Specifically, the Young's contact angle of the substrate material 1 is 90°, the diameter of the semi-vertebral microstructure 201 is 200 micrometers, and the spacing between adjacent semi-vertebral microstructures 201 is 0 micrometers.

[0038] Specifically, the columnar protrusion structure 301 has a width of 5 micrometers and a height of 15 micrometers, and the spacing between adjacent columnar protrusion structures 301 is 15 micrometers.

[0039] Specifically, the columnar protrusions 301 are symmetrically distributed on the semi-vertebral microstructure 201 along the line containing coordinates (100, 0).

[0040] Specifically, the initial position coordinates of the columnar protrusion structure 301 on the adjacent semi-vertebral microstructures 201 with a spacing of 10 micrometers are:

[0041] Specifically, the semi-vertebral microstructure 201 and the columnar protrusion structure 301 have the same geometric size.

[0042] Specific appearance as follows Figure 1 , Figure 2 As shown. Based on the established geometric design of the double-layer hydrophobic morphology, corresponding finite element simulations were performed to verify the influence of this double-layer structure on wetting performance. Therefore, the steps to be followed in the finite element simulation are as follows:

[0043] 1. After selecting the fluid module, establish a geometric model, creating a 5000μm × 5000μm structural outline. At the bottom coordinate point 0μm, create a semi-spine-shaped microstructure with a diameter of 200μm, with a spacing of 10μm between the semi-spine-shaped microstructures. After creating the semi-spine-shaped microstructures, create columnar microstructure protrusions on one of the structures. The geometric dimensions of the columnar protrusions are: width 15μm and height 15μm. The starting coordinates of the columnar protrusion structure 301 are 60μm and 91.57μm with a spacing of 10μm. The spacing between each columnar protrusion is 15μm, and 10-11 columnar protrusion structures 301 are distributed on each semi-spine-shaped microstructure. Using a 2μL water droplet, create a water droplet with a radius of 780μm in the model, with coordinates of 2500μm and 1000μm.

[0044] 2. After establishing the geometric model, the wetting wall angle of the hydrophobic structure is set to 90°. Open boundaries and an outlet are set for the three boundaries other than the structure. The water droplet model material is water at room temperature, surrounded by air. The microstructure is a material with an intrinsic contact angle of 90°. This simulation uses the phase-field method; to ensure accuracy during the simulation, fluid mass conservation should be selected.

[0045] 3. When meshing, the mesh should be refined at the interface between the double-layer microstructure and the water droplet, while the mesh should be appropriately coarsened in the non-water droplet contact areas to improve simulation accuracy and reduce computation time.

[0046] Results analysis:

[0047] Finite element method (FEM) simulations revealed that the contact angle of the semi-spinal microstructure with a spacing of 10 micrometers was 102°, an increase of 12° (approximately 13%) compared to the smooth intrinsic contact angle of 90°. Applying a second layer of columnar microstructures to the semi-spinal microstructure 201 with a spacing of 10 micrometers, FEM simulations under the same conditions showed a contact angle of 120°, an increase of 18° (approximately 17.6%) compared to the semi-spinal microstructure without the second layer, effectively improving wettability. Furthermore, comparing the 0-spacing semi-spinal microstructure with the second layer of columnar microstructures to the same structure with a spacing of 10 micrometers, the 0-spacing microstructure had a contact angle of 115°, a difference of 5°. The structure with a certain spacing increased the contact angle by approximately 4%, demonstrating that a certain spacing can improve wetting performance.

[0048] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0049] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0050] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydrophobic biomimetic surface with a double-layer structure, characterized in that: It includes a substrate material (1), a semi-spinal microarray structure (2), and a columnar array protrusion structure (3); The semi-spine-shaped microarray structure (2) includes a plurality of semi-spine-shaped microstructures (201) disposed on the surface of the substrate material (1); The columnar array protrusion structure (3) includes a plurality of columnar protrusion structures (301) arranged at a preset spacing on the surface of the semi-vertebral microstructure (201).

2. The hydrophobic biomimetic surface with a double-layer structure according to claim 1, characterized in that: The Young's contact angle of the substrate material (1) is 90°, the diameter of the semi-vertebral microstructure (201) is 200 micrometers, and the interval between adjacent semi-vertebral microstructures (201) is 0 micrometers or 10 micrometers.

3. The hydrophobic biomimetic surface with a double-layer structure according to claim 1, characterized in that: The columnar protrusion structure (301) has a width of 5 micrometers and a height of 15 micrometers, and the spacing between adjacent columnar protrusion structures (301) is 15 micrometers.

4. The hydrophobic biomimetic surface with a double-layer structure according to claim 1, characterized in that: The columnar protrusion structure (301) is symmetrically distributed on the semi-vertebral microstructure (201) along the line where the coordinates (100, 0) lie.

5. The hydrophobic biomimetic surface with a double-layer structure according to claim 2, characterized in that: The starting position coordinates of the columnar protrusion structure (301) on the adjacent semi-vertebral microstructure (201) with a 0-micrometer spacing are (20, 60).

6. The hydrophobic biomimetic surface with a double-layer structure according to claim 2, characterized in that: The initial position coordinates of the columnar protrusion structure (301) on the adjacent semi-vertebral microstructures (201) with a spacing of 10 micrometers are:

7. The hydrophobic biomimetic surface with a double-layer structure according to claim 1, characterized in that: The semi-vertebral microstructure (201) and the columnar protrusion structure (301) are geometrically identical.

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