Super-hydrophobic magnetic response micro-rib array for directionally transporting liquid drops and preparation method of super-hydrophobic magnetic response micro-rib array

Abstract

The invention discloses a super-hydrophobic magnetic response micro-rib array for directionally transporting liquid drops and a preparation method of the super-hydrophobic magnetic response micro-ribarray. According to the preparation method, a PMMA template is prepared by utilizing a laser ablation technology; a PDMS prepolymer, a curing agent and carbonyl iron powder are uniformly mixed;an obtained mixture is poured on the template; vacuum degassing treatment is carried out, the carbonyl iron powder particles on the surface of the template are magnetize; redundant mixed solution is scrapedoff from the surface of the template; a mixture of the pure PDMS prepolymer and the curing agent is poured, the template is stripped after the template is heated and cured, so that a magnetic responsemicro-rib array structure surface can be obtained; and the micro-rib structure surface is modified by using a laser ablation technology, so that the super-hydrophobic magnetic response micro-rib array surface can be obtained. The prepared super-hydrophobic magnetic response micro-rib array is high in response speed; and the magnetic response process of the super-hydrophobic magnetic response micro-rib array is reversible. The preparation method disclosed by the invention is simple and high in operability, can be practically applied to the directional transportation of liquid drops, and has awide application value in the fields of micro-fluidic control, biological medicines and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and relates to a superhydrophobic magnetic response microrib array for directional transport of liquid droplets and a preparation method thereof. Background technique [0002] Regulating the directional transport of droplets has a wide range of engineering applications in microfluidics, evaporative heat transfer, biomedicine, and water collection. At present, a large number of studies mainly focus on the preparation of static micro-nanostructured surfaces for the regulation of droplet transport behavior. However, due to the limitation of the surface structure, the process of regulating the directional transport behavior of droplets on the static micro-nanostructured surface is usually irreversible. [0003] In recent years, the development of dynamically responsive structural surfaces to regulate the directional transport of droplets has become a research hotspot. Un...

AI Technical Summary

Problems solved by technology

However, for the currently reported dynamically responsive structured surfaces, there are disadvantages such as slow response speed, high energy consumption, and short droplet transport distance, which severely limit its application range.

For example, the Chinese patent with the publication number CN107240475B discloses a magnetic array for directional transport of solid particles and its preparation method and application. A magnetic array is prepared by solidifying magnetic particles and polymers in a PVC sheet hole array, although it can realize Oriented and continuous transport of non-magnetic particles, but the maximum directional transport distance of its magnetic particles is only 5.3mm

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