Superhydrophobic magnetic-responsive microrib array for directional transport of droplets and its preparation method
A magnetically responsive, super-hydrophobic technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, inorganic materials, etc. It can solve the problems of short droplet transport distance, limited application range, slow response speed, etc., and achieve a wide range of applications. Value, operability, and the effect of reducing adhesion resistance
Active Publication Date: 2021-12-10
NANJING UNIV OF SCI & TECH
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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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Embodiment 1
[0032] Superhydrophobic magnetic response microrib array for directional transport of droplets and its preparation method, the preparation process is as follows figure 1 , including the following steps:
[0033] (1) Use laser ablation technology to process a rectangular groove array structure on the surface of acrylic (PMMA) to prepare a PMMA template. The groove is 10mm long and 100μm wide. The power of laser ablation is 15W, the speed is 254mm / s, and the number of ablation times is 4 times;
[0034] (2) Mix polydimethylsiloxane (PDMS) prepolymer, curing agent, and carbonyl iron powder (CIP) with a particle size of 3.9 to 5.0 μm in a mass ratio of 15:1:70 and pour it on the PMMA template , vacuum degassing for 1h;
[0035] (3) Gently scrape off the excess mixed solution on the surface of the PMMA template, so that the carbonyl iron powder particles only exist in the groove of the template. Place the PMMA template on a NdFeB permanent magnet with a magnetic field strength o...
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Abstract
The invention discloses a superhydrophobic magnetic response micro-rib array for directionally transporting liquid droplets and a preparation method thereof. In the present invention, the PMMA template is firstly prepared by laser ablation technology, and the PDMS prepolymer, curing agent and carbonyl iron powder are evenly mixed and poured on the template, vacuum degassed and magnetized on the surface of the carbonyl iron powder particles, and the excess on the surface of the template is scraped off. Mix the solution; then pour the mixture of pure PDMS prepolymer and curing agent, and peel off the template after heating and curing to obtain the surface of the magnetically responsive microrib array structure; finally, use laser ablation technology to modify the surface of the microrib structure to obtain superhydrophobic Magnetically responsive microrib array surface. The superhydrophobic magnetic response microrib array prepared by the invention has fast response speed and reversible magnetic response process. The preparation method of the invention is simple, has strong operability, can be practically applied to the directional transport of liquid droplets, and has wide application value in the fields of microfluidics, biomedicine 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...
Claims
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IPC IPC(8): H01F13/00H01F41/02H01F1/09
CPCH01F13/003H01F41/0253H01F41/0266H01F1/09
Inventor 李强钱晨露陈雪梅
Owner NANJING UNIV OF SCI & TECH