A self-driven water-collecting surface with superphobic-superhydrophilic structure and its preparation method
A super-hydrophilic, self-driven technology, applied to special surfaces, devices for coating liquid on surfaces, manufacturing tools, etc., can solve the problems that super-hydrophilic and super-hydrophobic surfaces cannot be prepared, and the degree of change is limited, so as to avoid The effect of water collection efficiency reduction
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[0037] A method for preparing a self-driven water-collecting surface with a super-repellent-super-hydrophilic structure provided by the present invention, the specific steps are as follows:
[0038] 1) The first pulse laser processing: the ultrashort pulse laser is used to ablate the surface of the sample, and the periodic peak-pit microstructure is ablated on the surface of the sample, and the micron array has abundant nanoparticles and nanofluff structures . Micron peaks have a diameter of 20-120 microns, a height of 20-160 microns, and a spacing of 20-120 microns; micron pits have a diameter of 20-120 microns, a depth of 10-50 microns, and a spacing of 20-120 microns; nanoparticles Or the size of the nanofluff is less than 800 nanometers. The ultrafast laser is femtosecond laser, picosecond laser or nanosecond laser.
[0039] 2) The surface of the sample processed by laser is modified. After the modification, the surface of the sample shows superhydrophobic characteristic...
Embodiment 1
[0046] 1) Sample preparation, use alcohol or acetone to ultrasonically clean the aluminum alloy plate with a thickness of 4 mm, and dry it for use;
[0047] 2) The first pulse laser treatment: femtosecond laser is used, combined with x-y scanning galvanometer, to ablate periodically distributed peak-pit microstructures on the sample, and these microstructures will have abundant nanostructures. The height of the micro-peaks to the micro-pits is 48 microns, the diameter of the micro-peaks is 20 microns, and the pitch is 35 microns. The diameter of the micro-pit is 20 microns, the depth is 10 microns, the pitch is 35 microns, and the size of the nanostructure is less than 800 nanometers.
[0048] 3) Carry out liquid-phase modification to the sample, make lauric acid into a methanol or ethanol dilute solution with a mass concentration of 1%, then place the treated surface in the dilute solution to soak for 2 hours, and then heat and dry in a drying oven When dry, a super-hydropho...
Embodiment 2
[0053] 1) Iron-carbon alloy sample preparation, ultrasonic cleaning of 4mm thick iron-carbon alloy with alcohol or acetone, and drying for later use;
[0054] 2) The first pulse laser treatment: Picosecond laser is used, combined with x-y scanning galvanometer, to ablate periodically distributed peak-pit microstructures on the sample, and these microstructures will have abundant nanostructures. The diameter of the micron peak is 20 microns, the height is 20 microns, and the interval is 20 microns; the diameter of the micron pit is 20 microns, the depth is 10 microns, and the interval is 20 microns. The nanostructure size is less than 800 nanometers.
[0055] 3) Carry out gas-phase modification of the sample in a high-temperature bellows, put the sample and 1 gram of perfluorodecyltrimethoxysilane into the high-temperature bellows at the same time, adjust the temperature to 120°C, and heat for 0.5 hours to obtain a superhydrophobic surface. The contact angle of water can reach...
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