Search

CN-122007636-A - Preparation method of double bionic wettability patterning mist collecting surface structure

CN122007636ACN 122007636 ACN122007636 ACN 122007636ACN-122007636-A

Abstract

The invention discloses a preparation method of a double bionic wettability patterning mist collecting surface structure, and belongs to the field of atmospheric water collection and functional surface preparation. Based on the double bionic concepts of cactus and spider silk, the preparation of the mist collecting surface structure is realized by combining laser ablation and surface modification technology. Firstly, performing primary laser ablation on an aluminum sheet to obtain a super-hydrophilic aluminum sheet substrate, immersing the super-hydrophilic aluminum sheet substrate in a fluorosilane alcohol solution for low surface energy modification treatment after ultrasonic cleaning, and then transferring the modified aluminum sheet into a drying oven for drying to obtain the super-hydrophobic aluminum sheet. And constructing a hydrophilic region with a preset pattern on the super-hydrophobic aluminum sheet through secondary laser ablation, and constructing a rectangular through hole structure through continuous laser ablation to obtain the mist collecting surface structure. The method disclosed by the invention is simple in process steps, and the obtained surface has excellent mist water collection performance and is suitable for large-scale production.

Inventors

  • FAN ZENGHUA
  • HE CHANGYU
  • WANG QINGZHEN
  • GAO JUN

Assignees

  • 山东理工大学

Dates

Publication Date
20260512
Application Date
20260403

Claims (6)

  1. 1. The preparation method of the double bionic wettability patterning mist collecting surface structure is characterized by comprising a super-hydrophilic channel (1-1), a super-hydrophobic aluminum sheet substrate (1-2) and rectangular through holes (1-3), wherein the super-hydrophilic channel (1-1) is arranged on the super-hydrophobic aluminum sheet substrate (1-2) in an array mode, the super-hydrophilic channel (1-1) is provided with a two-dimensional conical structure (111) imitating a cactus tip and a two-dimensional periodic arc-shaped structure (112) imitating a spider silk spindle knot, and the upper surface and the lower surface of the super-hydrophobic aluminum sheet substrate (1-2) are both super-hydrophobic structures (113), and the preparation method comprises the following steps: Firstly, performing first laser ablation treatment on the surface of an original aluminum sheet (2-1) by using a fiber laser to obtain a super-hydrophilic aluminum sheet (2-2); Placing the obtained super-hydrophilic aluminum sheet (2-2) in a beaker containing ethanol solution, cleaning for 30min by using an ultrasonic cleaner, removing impurities on the surface of the aluminum sheet, and naturally airing the aluminum sheet in the air after the cleaning is finished; Preparing a mixed solution of fluorosilane solution and alcohol solution by using an electronic balance, immersing the ultrasonically cleaned aluminum sheet into the solution for 60 minutes, and reducing the surface energy of the surface of the aluminum sheet substrate; Step four, placing the soaked aluminum sheet into a drying oven, and performing low-pressure non-oxidation drying on the aluminum sheet at 80 ℃ for 120 min to obtain a super-hydrophobic aluminum sheet (2-3); Performing secondary laser ablation treatment on the super-hydrophobic aluminum sheet (2-3) by using a fiber laser to obtain 5 super-hydrophilic channels (1-1) which are longitudinally and equally spaced, and performing continuous laser ablation treatment at the gaps of the super-hydrophilic channels (1-1) to obtain 16 rectangular through holes (1-3) which are longitudinally and equally spaced, wherein the super-hydrophobic region and the super-hydrophilic channels (1-1) which are provided with a two-dimensional conical structure (111) imitating cactus tips and a two-dimensional periodic arc-shaped structure (112) imitating spider silk spindle knots are alternately arranged to form a double bionic wettability patterning mist collecting surface structure.
  2. 2. The method for preparing the dual bionic wettability patterning mist collecting surface structure according to claim 1, wherein the original aluminum sheet (2-1) is 50mm multiplied by 100mm in size.
  3. 3. The method for preparing the dual bionic wettability patterning mist collection surface structure according to claim 1, wherein the mass ratio of the fluorosilane solution to the alcohol solution is 1:100.
  4. 4. The method for preparing the dual bionic wettability patterning mist collecting surface structure according to claim 1, wherein the center line spacing between the five super-hydrophilic channels (1-1) which are longitudinally and equidistantly arranged is 11mm, the longitudinal spacing between the rectangular through holes (1-3) is 9mm, and the distance between the center line of the super-hydrophilic channel (1-1) and the center line of the rectangular through hole (1-3) is 5.5mm.
  5. 5. The preparation method of the double bionic wettability patterning mist collecting surface structure according to claim 1, wherein the length of the super-hydrophilic channel (1-1) is 89.7mm, and the length of the rectangular through hole (1-3) is 15mm and the width is 4mm.
  6. 6. The method for preparing the dual-bionic wettability patterning mist-collecting surface structure according to claim 1, wherein the first laser ablation treatment, the second laser ablation treatment and the continuous laser ablation treatment all adopt the same laser processing parameters, wherein the line spacing is 20 μm, the laser power is 20W, the pulse width is 10ns, the scanning speed is 1000mm/s, the frequency is 30kHz, the laser processing times of the first laser ablation treatment and the second laser ablation treatment are 1, and the laser processing times of the continuous laser ablation treatment are 30.

Description

Preparation method of double bionic wettability patterning mist collecting surface structure Technical Field The invention belongs to the technical field of functional surface preparation and mist collection, and particularly relates to a preparation method of a double bionic wettability patterning mist collection surface structure. Background With the continuous growth of global population and the continuous development of industrialization, the shortage of fresh water resources has become a significant factor restricting the sustainable development of human society. In this context, it is important to develop non-traditional water sources. Mist is a potential fresh water resource consisting of numerous tiny water droplets suspended in the atmosphere, which is captured efficiently and converted into available fresh water resources, and is considered as a renewable resource acquisition strategy with great potential. This highlights the urgent and significant importance of developing new and efficient mist collecting materials and structures. At present, the mist and water collecting technology mainly depends on a net-shaped collector which is vertically arranged, and the working principle of the mist and water collecting technology is that mist drops directly impact net-shaped fibers and are deposited under the condition that the mist drops are wrapped and clamped by air flow, so that the mist and water collecting technology is captured by the net-shaped collector. However, such conventional mesh mist collectors have significant limitations. First, from an aerodynamic perspective, the mesh structure creates a significant obstruction to the airflow while intercepting the mist droplets, which results in most of the mist-carrying airflow being forced to bypass or pass directly through the mesh openings, rather than effectively colliding with the fibers and failing to be effectively captured, resulting in inefficient water collection. In addition, at structure and maintenance level, mesh structure not only is liable to be blocked by dust impurity, causes the performance to continue to decay, still because of its great surface area, the water droplet of catching under strong wind and sunshine is liable to be lost by the secondary evaporation, leads to the net rate of recovery of water resource generally lower. To overcome the inherent defects of the traditional mesh mist collector, the development of a mist collecting surface with special wettability becomes a key for solving the technical defects. For example, the surface inspired by the hydrophilic-hydrophobic alternating pattern of the back of the beetles in the desert can realize the aggregation and directional conveying of fog drops, thereby being hopeful to greatly improve the water collecting efficiency. Methods of constructing such hybrid patterned surfaces in the prior art have included mainly sol-gel processes, inkjet printing, vapor deposition masking processes, and the like. However, these methods generally have the problems of complicated process steps, mask requirement, limited adhesive force and the like, and are difficult to realize stable and low-cost preparation. Therefore, the novel surface structure and the preparation technology which are simple in preparation method and low in cost and can realize efficient mist and water collection have important significance. Disclosure of Invention The invention relates to a preparation method of a double bionic wettability patterning surface structure, which constructs a micro-nano composite patterning structure with a wetting gradient on an aluminum sheet substrate through laser processing and surface modification processes, so as to prepare a mist collecting surface which has high-efficiency mist collecting performance and is easy for large-scale industrialized production. The preparation method adopted by the invention comprises the following steps: Performing first laser ablation treatment on the surface of an original aluminum sheet (2-1) by using a fiber laser to obtain a super-hydrophilic aluminum sheet (2-2); Placing the obtained super-hydrophilic aluminum sheet (2-2) in a beaker containing ethanol solution, cleaning for 30min by using an ultrasonic cleaner, removing impurities on the surface of the aluminum sheet, and naturally airing the aluminum sheet in the air after the cleaning is finished; Preparing a mixed solution of fluorosilane solution and alcohol solution by using an electronic balance, immersing the ultrasonically cleaned aluminum sheet into the solution for 60 minutes, and reducing the surface energy of the surface of the aluminum sheet substrate; Step four, placing the soaked aluminum sheet in a drying oven, and performing low-pressure non-oxidation drying for 120min at the temperature of 80 ℃ to obtain a super-hydrophobic aluminum sheet (2-3); Performing secondary laser ablation treatment on the super-hydrophobic aluminum sheet (2-3) by using a fiber laser to obtain 5 super-hydr