CN-121157373-B - Shape memory effect-based two-dimensional directional liquid conveying method controlled on open surface

CN121157373BCN 121157373 BCN121157373 BCN 121157373BCN-121157373-B

Abstract

The invention discloses a method for controlling directional transportation of liquid on an open surface in two-dimensional directions based on shape memory effect, which comprises the following steps of 1, designing and constructing symmetrical morphological structure units; the method comprises the steps of designing and constructing an open module of a two-dimensional direction array of a symmetrical form structure unit, preparing light-cured 3D printing resin with a shape memory effect, 3D printing the open module of the two-dimensional direction array based on the shape memory effect resin, setting and repeatedly programming a path of the open module of the two-dimensional direction array in the step 5, carrying out 3D printing, carrying out directional transportation of liquid along the two-dimensional direction of a programming path in the step 6, and regulating and controlling the directional transportation speed of the liquid along the two-dimensional direction of the programming path in the step 7. The invention realizes the precise directional transportation of liquid with adjustable direction and controllable speed in any path in two-dimensional direction based on shape memory effect, and has wide application prospect in the front fields of microfluidic chips, biochemical microreactors and the like.

Inventors

CHENG ZHONGJUN
GU TONGFEI
Song Zhixiao
WANG XIAONAN
LIU YUYAN
ZHANG DONGJIE
LAI HUA

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260512
Application Date: 20251111

Claims (7)

1. A method for controlling directional transportation of liquid on an open surface in two dimensions based on shape memory effect, which is characterized by comprising the following steps: Step 1, designing and constructing symmetrical form structural units: 3D modeling is carried out on the structural unit by utilizing three-dimensional modeling software to construct a pinnacle pyramid structure with a full-symmetrical structure, wherein the structural unit is divided into two parts, namely a prism structure positioned at the lower half part and a pyramid structure positioned at the upper half part, and the bottom surface of the prism structure is of side length Is square with a middle platform of side length Is a square of the number (a), The bottom surface platform of the pyramid structure is of side length The top of the square is of a sharp-topped pyramid structure, and the height of the prism structure is The height of the pyramid structure is The included angle between the side edge and the bottom surface of the prism is ; Step2, designing and constructing an open module of a two-dimensional direction array of the symmetrical form structural unit: Step 2-1, creating a cuboid bottom plate model with equal length and width by utilizing Solidworks; Step 2-2, carrying out two-dimensional array on the symmetrical form structural units in the assembly model along the length-width direction on the cuboid bottom plate model to obtain an open module of the two-dimensional array of the symmetrical form structural units; Step 3, preparing a photo-curing 3D printing resin with a shape memory effect: Uniformly mixing a tetrafunctional mercapto cross-linking agent, a difunctional acrylic ester chain-building agent and a monofunctional acrylic ester diluent in a container, adding a photoinitiator, a light absorber and a free radical inhibitor under a light-shielding condition, uniformly mixing, and storing in a light-shielding place, wherein the mass ratio of the tetrafunctional mercapto cross-linking agent, the difunctional acrylic ester chain-building agent and the monofunctional acrylic ester diluent is 30-50:30-40:10-40, and the dosages of the photoinitiator, the light absorber and the free radical inhibitor are respectively 0.5-1.5 wt%, 0.01-0.05 wt% and 0.01-0.05 wt% of the total mass of the tetrafunctional mercapto cross-linking agent, the difunctional acrylic ester chain-building agent and the monofunctional acrylic ester diluent; Step 4, 3D printing of an open module based on a two-dimensional array of shape memory effect resins: Introducing the open modules of the two-dimensional direction arrays of the symmetrical form structural units into a 3D printer, and performing 3D printing by using the photo-curing 3D printing resin in the step 3 to obtain the open modules of the two-dimensional arrays for 3D printing; step 5, setting and repeatedly programming a path of the 3D printing two-dimensional array open module: step 5-1, setting a path, namely heating a 3D printing two-dimensional array open module, heating the module to a temperature above the glass transition temperature, deforming a structural unit in the 3D printing two-dimensional array open module along any two-dimensional direction, cooling the structural unit to room temperature, and fixing the structural unit to realize surface array structural change; step 5-2, repeating programming, namely reheating the 3D printing two-dimensional array open module, heating the 3D printing two-dimensional array open module to a temperature above the glass transition temperature, recovering the path set in the step 5-1 to the original shape, reheating the 3D printing two-dimensional array open module to a temperature above the glass transition temperature, deforming the structural units in the 3D printing two-dimensional array open module along any two-dimensional direction, cooling the structural units to room temperature, fixing the structural units, and resetting the path; step 6, directional transportation of the liquid along the two-dimensional direction of the programming path: Injecting low-surface-tension liquid along the surface of any structural unit of the path, spreading the low-surface-tension liquid along the deformation direction of the structural unit, and transporting the low-surface-tension liquid along the set path to realize the directional transportation of the liquid along the two-dimensional direction of the programmed path; step 7, regulating and controlling the directional transportation speed of the liquid along the two-dimensional direction of the programming path: Different transmission speeds are realized by changing the adjacent intervals among different structural units, different deformation inclination angles and different injection speeds in the open modules of the two-dimensional direction array of the symmetrical form structural units.
2. The method for controlling the directional transportation of a liquid on an open surface in two dimensions based on the shape memory effect according to claim 1, wherein in the step 1, =0.5~1mm, =0.94~3.76mm, =1.25~5mm, =1~4mm, 。
3. The method for controlling the directional transportation of the liquid on the open surface in the two-dimensional direction based on the shape memory effect according to claim 1 is characterized in that the specific steps of the step 2-1 are that an assembly body is created by utilizing Solidworks, and the pointed pyramid structure with the full-symmetry structure designed in the step 1 is assembled with a cuboid bottom plate model part and is linearly arrayed, so that a single surface array structure and a bottom plate assembly body model is obtained.
4. The method for controlling the directional transportation of the liquid on the open surface in the two-dimensional direction based on the shape memory effect according to claim 1, wherein in the step 2-2, the arrangement interval of the adjacent symmetrical morphology structural units in the two-dimensional direction is 2.5mm, 3mm or 3.5mm.
5. The method for controlling the directional transportation of the liquid on the open surface based on the shape memory effect according to claim 1, wherein in the step 3, the tetrafunctional mercapto cross-linking agent is pentaerythritol tetramercapto acetate, the difunctional acrylate chain-building agent is one of polyurethane-acrylate cross-linking agents CN996, CN966, CN9021, polyethylene glycol diacrylate and tripropylene glycol diacrylate, the monofunctional acrylate diluent is one of isobornyl methacrylate, hydroxyethyl acrylate, 4-acryloylmorpholine and N-vinyl pyrrolidone, the photoinitiator is a photoinitiator 819, the light absorber is sudan III, and the free radical inhibitor is p-methoxyphenol.
6. The method for controlling directional transportation of liquid on an open surface in two dimensions based on shape memory effect according to claim 1, wherein in the step 4, 3D printing parameters are as follows, curing layer by layer onto an upper platform under a 385nm light source, and each layer of cured layer is 0.5-0.1 mm in height.
7. The method for controlling the directional transportation of the liquid on the open surface in the two-dimensional direction based on the shape memory effect according to claim 1, wherein in the step 6, the tension of the low surface tension liquid is 22.1-24 mN/m.

Description

Shape memory effect-based two-dimensional directional liquid conveying method controlled on open surface Technical Field The invention belongs to the technical field of intelligent transportation, relates to a two-dimensional directional transportation method for liquid, and in particular relates to an accurate directional transportation method for liquid controlled by a shape memory effect, wherein the path and the direction of the liquid in the two-dimensional direction of an open surface are switchable, and the speed of the liquid can be adjusted repeatedly. Background The open surface liquid directional transportation technology has important application value in the fields of chemical process, energy management, medical control and the like. Currently, open surface directional transportation strategies developed based on bionic nepenthes, southern cedar, succulent plants, wedge structures, and the like have made significant progress. However, the transportation mode driven by the bionic structure still has obvious limitations that on one hand, the system lacks real-time controllability, and in practical application, the system faces the problems of weak customization capability, repeated design and processing and the like, and on the other hand, the transportation speed is difficult to flexibly regulate and control. Particularly, the prior art is limited to realizing unidirectional liquid drop control in one-dimensional direction, and is difficult to realize directional transportation with flexibly adjustable arbitrary path, arbitrary direction and transportation speed on a two-dimensional plane, and the field still has important technical blank. Disclosure of Invention The invention provides a method for controlling directional transportation of liquid on an open surface in two dimensions based on shape memory effect, which is based on resin with shape memory effect and photo-curing 3D printing technology (DLP), prepares an open module with symmetrical form structural units and repeatedly arranged into an array, utilizes the shape memory effect to regulate and fix the shape of the structural units in the module in any direction in a two-dimensional plane, thereby realizing programmable design of paths, the paths can be repeatedly programmed in any direction, and the accurate directional transportation of liquid in any direction along a preset path in the two-dimensional direction can be realized by combining fixed point dripping of liquid. In addition, through the interval between the design structural units, the deformation angle of adjustment structural units and the injection speed of liquid, the transport speed of liquid along the appointed route can be further regulated and controlled. The invention provides a novel method for realizing the directional liquid transportation with flexibly controllable path, direction and speed in two-dimensional directions based on an open structure module regulated and controlled by a shape memory effect. The invention aims at realizing the following technical scheme: a method for controlling directional transportation of liquid on an open surface in two dimensions based on shape memory effect comprises the following steps: Step 1, designing and constructing symmetrical form structural units: 3D modeling is carried out on the structural unit by utilizing three-dimensional modeling software, and a pinnacle pyramid structure with a full-symmetrical structure is constructed, wherein: creating a part by utilizing Solidworks; The structural unit is divided into two parts, namely a prismatic structure positioned in the lower half part and a prismatic structure positioned in the upper half part, wherein the bottom surface of the prismatic structure is provided with a side length Is square with a middle platform of side lengthIs a square of the number (a),The bottom surface platform of the pyramid structure is of side lengthThe top of the square is of a sharp-topped pyramid structure, and the height of the prism structure isThe height of the pyramid structure isThe included angle between the side edge and the bottom surface of the prism is;=0.5~1mm,=0.94~3.76mm,=1.25~5mm,=1~4mm,For example:,,,,;,,,,;,,,,;,,,,; step2, designing and constructing an open module of a two-dimensional direction array of the symmetrical form structural unit: Step 2-1, creating a cuboid bottom plate model with equal length and width by utilizing Solidworks, wherein the specific steps are that an assembly body is created by utilizing Solidworks, and the pointed pyramid structure with the full-symmetry structure designed in the step 1 and the cuboid bottom plate model part are assembled and linearly arrayed to obtain a single surface array structure and bottom plate assembly body model; Step 2-2, carrying out two-dimensional array on symmetrical form structural units in the assembly body model along the length-width direction on the cuboid bottom plate model to obtain an open module of the two-dim