Recently, scientists at the Max Planck Institute for Intelligent Systems in Germany have developed a biomimetic fiber bonding material, which has super-liquid repellency while maintaining bonding performance. It is expected to be widely used in production and life in the future. s surface.
The gecko foot pads have micro- or nano-scale microciliary arrays, and the tops also have bifurcations, making them easy to climb on various surfaces such as glass and walls. This excellent adhesion is based on the principle of intermolecular forces. In the past ten years, the fiber bonding system developed on the basis of bionic simulation has been developed, but one problem has not been solved, that is, if there is liquid at the contact interface, it will affect the bonding performance. Now, German scientists have solved this problem through mushroom-shaped fiber design.
Bionic fiber bonding materials use intermolecular forces (also known as van der Waals forces) in bonding. The contact between the surface of the bionic fiber and the surface of the object must be close to the molecular level, and sufficient van der Waals force can be generated between the two to maintain the bonding performance. If there is liquid at the contact interface, such as oil, because of the low surface tension, the oil can quickly wet the surface, usually spreading on and between the fine hairs of the fibers, causing them to come together and lose their adhesion.
Dr. Weiler Limatenin and Professor Medin Siti of the Max Planck Institute for Intelligent Systems developed a bionic fiber bonding material with super-lyophobicity. Dr. Limatynin said: "We have developed a special mushroom-shaped villi structure, such a material can not only repel water, but also effectively repel any liquid, including oil, and always maintain adhesion."
The delicate design of the fiber tip is the key to the oil resistance of this material. In the material manufacturing process, scientists used two-photon laser lithography. Dr. Limatynin explained: "Even at very low surface tension, the T-shaped overhang of the fiber tip (similar to mushrooms) can support the liquid, which is the reason for achieving super-liquidity." The T-shaped fiber tip The overhang height is about 40 microns, the diameter of the cap is about 28 microns, and the minimum diameter under the cap is about 10 microns. This structure makes the liquid spread to the tip of the fiber, because the surface tension has an upward component, which can prevent the liquid from slipping between the two fibers.
This study combines the principle of effective adhesion of mushroom-shaped fiber arrays and the liquid repellency based on the geometry of the double concave angle fiber tip, which keeps the surface of the fiber tip smooth for high dry adhesion, and does not involve surface chemical modification. Elasticity and stretchability. Professor Siti added: "Fiber adhesive materials inspired by geckos can now adhere to any wet surface without loss of adhesion. For example, climbing robots will be able to use this adhesive material to climb wet Glass plate. In industrial applications, the robot hand coated with this material can grasp any object covered by liquid and then put it down. "(Reporter Li Shan)
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