CN114547853A - Design method and application of three-dimensional porous inclined array structure for liquid directional transportation - Google Patents
Design method and application of three-dimensional porous inclined array structure for liquid directional transportation Download PDFInfo
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Abstract
The invention provides a design method and application of a three-dimensional porous inclined array structure for directional liquid transportation, and belongs to the field of microfluidics. The design scheme applies the micron-scale porous structure to the field of microfluidics and combines the micron-scale porous structure with the traditional liquid directional transport inclined array structure. The shape of the micron-sized porous structure can adopt various hole shapes, such as a triangle, a rectangle, a hexagon, a circle or other figures. Meanwhile, the micron-sized porous structure is applicable to various inclined array structures, and can realize the regulation and control of the conveying position and speed of liquid in a three-dimensional space on the premise of ensuring the conveying characteristics of the original structure, and realize the controllable conveying of the liquid in the vertical direction and the horizontal direction. Compared with the traditional mesh-free array structure, the micro-scale porous structure can realize the liquid diffusion inside the structure on the premise of ensuring the liquid diffusion outside the structure. Meanwhile, the micron-sized porous inclined array structure can be suitable for various materials. Therefore, by utilizing the characteristics, the design scheme enables the liquid directional transportation structure characteristics, the processing scheme and the application environment to be more flexible.
Description
Technical Field
The invention belongs to the field of microfluidics, and relates to a design method and application of a three-dimensional porous inclined array structure, which applies a micron-sized porous structure to the field of microfluidics and combines the micron-sized porous structure with a traditional inclined array structure to realize directional liquid transportation.
Background
Spontaneous directional transportation of liquid on a solid surface widely exists in natural systems and engineering practices, and has wide application prospects in the fields of micro-fluidic, water collection, condensation heat exchange, interface lease reduction and the like. It has been found that there are many surfaces in nature that have spontaneous directional transport of liquids, such as the back of the desert beetle, spider silk, butterfly wings, cactus, bird's beak, and pitcher plant, among others. Inspired by it, researchers have proposed several methods of directional transport of liquids, including wettability gradients, curvature gradients, and anisotropic structures, among others. For example, a liquid tends to flow from a region of high surface energy to a region of low surface energy under the action of a wettability gradient and from a region of high curvature to a region of low curvature under the action of laplace pressure.
Although research on the directional transport of liquids has yielded certain research results, most of the research is limited to one-and two-dimensional directional transport of liquids. For one-dimensional liquid directional transportation, only one trend of the liquid in the transportation process can be ensured, and the diffusion of the remaining two dimensions of the liquid cannot be controlled. For two-dimensional liquid directional transportation, the liquid transverse diffusion can be controlled, and meanwhile, the longitudinal liquid directional transportation can be realized, but the liquid diffusion in the direction vertical to the substrate cannot be controlled. The one-dimensional and two-dimensional liquid directional transportation has the problem that the position and the speed of the liquid directional transportation cannot be accurately controlled, and the application range of the liquid directional transportation is greatly limited.
Disclosure of Invention
The invention aims at the problems and designs an inclined array structure surface with a micron-scale porous structure for directional transportation of three-dimensional liquid, wherein the micron-scale porous structure can adopt various pore shapes, such as triangle, rectangle, hexagon, circle or other patterns. Meanwhile, the micron-sized porous structure is applicable to various inclined array structures, and can realize the regulation and control of the conveying position and speed of liquid in a three-dimensional space on the premise of ensuring the conveying characteristics of the original structure, and realize the controllable conveying of the liquid in the vertical direction and the horizontal direction. . Conventional non-mesh array structures must employ a separation structure to achieve liquid diffusion, while liquid diffusion exists only outside the structure. Therefore, compared with the traditional mesh-free array structure, the micro-scale porous structure can realize the liquid diffusion inside the structure on the premise of ensuring the liquid diffusion outside the structure. By utilizing the characteristics, the directional liquid transportation structure characteristics, the processing scheme and the application environment are more flexible, and the impact resistance can be enhanced by adopting a armor-like covering array structure, the unidirectionality can be enhanced by adopting a tubular continuous array structure, the directivity can be enhanced by adopting a dense single-row array structure and the like. Meanwhile, the preparation of the micron-sized porous inclined array structure can adopt a relatively mature photocuring 3D printing technology, a micron-sized laser processing technology, an electrochemical special processing technology and the like. In order to quickly verify the structural feasibility, the invention initially adopts the photocuring 3D printing technology to prepare a sample.
The invention adopts the following specific technical scheme:
a design method of a three-dimensional porous inclined array structure for directional liquid transportation combines a micro porous structure and an inclined array structure, wherein the inclined array structure is a traditional micron-scale or submillimeter-scale structure, and is formed by obliquely arranging n repeating units. And processing micron-scale or sub-millimeter-scale micro-porous structures in the repeating units of the inclined array structure, wherein the micron-scale porous structures are meshes which prevent liquid beyond a specific surface energy range from passing through, so that specific liquid which does not exceed the specific surface energy range can be directionally conveyed through the insides of the mesh structures, and the shapes and the numbers of the micron-scale porous structures in the repeating units can be the same or different. The size of the micro porous structure is controllable, and the micro porous structure is designed according to different surface energy liquids. On the basis of an inclined array structure, a mesh structure can be designed into a multi-row structure in a targeted manner, and the liquid directional transportation function perpendicular to the substrate direction can be realized by matching the capillary force of the structural gaps, so that the three-dimensional liquid directional transportation function is innovatively realized.
First, the structural size and the inclination angle of the repeating unit are designed according to the liquid properties.
Secondly, designing a transverse structure and a longitudinal structure of the inclined array structure. The transverse structures can be designed with gaps or with structural strength. The longitudinal structure can be designed into a non-continuous short rectangle type, a continuous long rectangle type, a tubular type, a grid array type and the like.
Thirdly, according to requirements, the size, the shape and the number of the micron-sized porous inclined array structures are designed, so that the micron-sized porous inclined array structures have a three-dimensional liquid directional transportation function. The shape of the micron-sized porous structure can be designed to be triangular, rectangular, hexagonal or other polygonal shapes, circular and the like; one or more than one; arranged in one row or more than one row.
The preparation method of the micron-sized porous inclined array structure for liquid directional transportation comprises the following steps:
firstly, drawing an inclined array structure with a micron-scale porous structure by using three-dimensional drawing software to obtain an initial model. The porous structure is selected from pores with equivalent diameter larger than 200 μm. The inclined structure is selected to have the vertical height of more than 700 mu m and the inclination angle of 30-70 degrees. Meanwhile, the inclined array structure selects a non-continuous short rectangle type, a continuous long rectangle type, a tubular type and a grid array type.
And secondly, slicing the drawn initial model. And meanwhile, the expansion rule of the 3D printing sample is considered, and the initial model is specially processed. The cutting program was set so that the printing accuracy was controlled to be within 15 μm. The layer thickness is set to be less than 20 μm. And simultaneously setting exposure time and intensity to enable the structure size to meet the precision requirement.
And thirdly, post-processing the printed sample. Firstly, ultrasonically cleaning for 1-3 min by using alcohol, then ultrasonically cleaning for 1-3 min by using deionized water, removing residual resin, and drying by using nitrogen. Finally, placing the glass substrate in a curing lamp box for secondary curing.
The application of the micron-sized porous inclined array structure for the directional transportation of liquid is used for manufacturing a microfluidic chip.
The invention has the beneficial effects that:
(1) according to the invention, through a design scheme combining the micron-sized porous structure and the inclined array, the characteristic that the liquid in the structure can be directionally transported by utilizing the micron-sized porous structure is utilized, and the faster transportation speed and the better unidirectional property are realized compared with the original non-mesh inclined array structure.
(2) The design scheme of the invention utilizes the characteristic that the liquid transportation of the micron-scale porous structure in the direction vertical to the substrate is controllable, and realizes the three-dimensional liquid directional transportation function which cannot be realized by the traditional inclined array structure.
(3) The design scheme of the invention utilizes the characteristic that the micron-sized porous structure can realize the directional transportation of the liquid in the structure, and overcomes the defects of over-small structural strength, easy falling and the like of the traditional liquid directional transportation structure. The liquid directional conveying structure with better mechanical strength is realized.
(4) The design scheme of the invention can be applied to various traditional inclined array structures. Meanwhile, due to the existence of the micron-sized porous inclined array structure, a plurality of unconventional micron-sized porous inclined array structures for liquid directional transportation can be derived. The design of the liquid directional conveying structure is more flexible, the processing scheme is easier to realize, and the application range is wider.
Drawings
FIG. 1 is a three-dimensional model of an example provided by the present design;
FIG. 2a is a photograph of an exemplary super depth of field microscope configuration according to an embodiment of the present invention;
FIG. 2b is a top view of a liquid directional transport system according to an embodiment of the present invention;
FIG. 3a is a diagram of directional liquid transport in a non-mesh slanted array structure;
FIG. 3b is a diagram of directional liquid transport with a mesh inclined array structure;
FIG. 4a is a diagram of the directional transport of a single-layer liquid in a micro-scale porous inclined array structure;
FIG. 4b is a diagram of the directional transport of a bilayer liquid in a micro-scale porous inclined array structure;
FIG. 5 is a flow chart of a method of making an embodiment of the present invention;
fig. 6 shows a different innovative design for a liquid directional transport structure provided by the design of the present invention. (a) A slow liquid directional transport structure having a wide flow area; (b) has a liquid directional conveying structure with high wear resistance and high impact resistance.
FIG. 7 is a design diagram of the present invention.
Detailed description of the preferred embodiments
The technical solution of the present invention will be further described in detail with reference to the following embodiments and the accompanying drawings.
Examples
The preparation method of the discontinuous short rectangular scheme of the micron-scale porous inclined array structure comprises the following steps:
the material is red wax high-precision resin.
Firstly, drawing the micron-scale porous inclined array structure by using three-dimensional drawing software. The porous structure is characterized in that equilateral triangle holes with the side length of 500 mu m are selected, two rows of holes are selected, and the hole distance is 150 mu m. The inclined structure monomer structure adopts a trapezoid with the horizontal thickness of 230 mu m and the vertical height of 1400 mu m, the upper side length of the trapezoid is 750 mu m, the lower side length is 1500 mu m, and the inclination angle is 45 degrees. The single-column micron-scale porous inclined array structure is formed by arranging the single structures according to horizontal and longitudinal repeated arrays.
And secondly, slicing the drawn model. Meanwhile, considering the expansion rule of the 3D printing piece, the structure is submerged by 100 mu m when the thickness is increased by 1mm, and the model is thickened. The slicing procedure was set and red wax resin was selected as the material. The layer thickness was set to 20 μm. The following parameters are also proposed for the photocuring printer used: the bottom layer bonding exposure time is 18s, the number of bonding exposure layers is 20, the model exposure is 1.9s, the printing platform demoulding height is 5mm, and the demoulding rest time is 1 s.
And thirdly, post-processing the printed sample. Firstly ultrasonically cleaning for 3min by alcohol, then ultrasonically cleaning for 3min by deionized water, removing residual resin, and then drying by nitrogen. And finally, placing the mixture in a curing lamp box for secondary curing, wherein the curing time is 3 min.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (3)
1. A design method of a three-dimensional porous inclined array structure for directional liquid transportation is characterized in that the inclined array structure is a traditional micron-level or submillimeter-level structure and is formed by obliquely arranging n repeating units, and the design method combines the micron porous structure and the inclined array structure, can regulate and control the transportation of liquid in the horizontal and vertical directions, further realizes the directional transportation of the three-dimensional liquid and has higher transportation speed; in the repeating unit of the inclined array structure, a micron-sized or sub-millimeter-sized micron porous structure is processed by a 3D printing technology, and the micron-sized porous structure can regulate and control the transport resistance of liquid with different surface tensions, so that the accurate control and the rapid transport of the liquid transport speed are realized; the shape, the number and the size of the micro porous structure can be controlled, and the micro porous structure is designed according to different surface energy liquids.
2. A design method of a three-dimensional porous inclined array structure for directional liquid transportation is characterized in that the shape of the micron-sized porous structure can be designed into a triangle, a rectangle, a hexagon, a circle or other figures; one or more than one; arranged in one row or more than one row.
3. The application of the micron-sized porous tilt array structure for the directional transportation of liquid, which is obtained by the design method of claim 1 or 2, is characterized in that the structure can be applied to the manufacture of microfluidic chips.
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| CN111632632A (en) * | 2020-05-12 | 2020-09-08 | 大连理工大学 | Ridge array structure for directional transportation of liquid drops on high-temperature surface and preparation method thereof |
| WO2021233253A1 (en) * | 2020-05-19 | 2021-11-25 | 华南师范大学 | Liquid drop directional transport device |
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2022
- 2022-01-12 CN CN202210030218.6A patent/CN114547853A/en active Pending
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| US20020092767A1 (en) * | 1997-09-19 | 2002-07-18 | Aclara Biosciences, Inc. | Multiple array microfluidic device units |
| US20060257908A1 (en) * | 2003-10-23 | 2006-11-16 | Georgetown University | Method for two- and three-dimensional microassembly of patterns and structures |
| US20190161715A1 (en) * | 2011-10-20 | 2019-05-30 | Research Foundation Of The City University Of New York | Layered microfluidic array |
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