Janus-gradient composite wettability copper wire capable of achieving ultra-fast transmission of liquid drops and preparation method of Janus-gradient composite wettability copper wire
A wettability, ultra-fast technology, applied in the direction of nanotechnology, nanotechnology, metal material coating technology, etc. for materials and surface science, can solve the instability of surface micro-nano structure, large contact angle hysteresis, liquid Droplet transmission resistance and other problems, to achieve long-distance directional transport high efficiency, low cost, and solve the effect of large contact angle hysteresis
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Embodiment 1
[0036] A preparation method of a Janus-gradient composite wettability copper wire capable of realizing ultra-fast droplet transport, comprising the steps of:
[0037] Step 1, pretreating the copper wire;
[0038] First, straighten a copper wire with a diameter of 0.5 mm, then ultrasonically clean it in acetone, absolute ethanol, and deionized water with a concentration of 1 mol / L for 10 minutes, and then take out the copper wire;
[0039] Then, immerse the cleaned copper wire in a 1mol / L hydrochloric acid solution, take it out after 10s, and remove the oxide layer on the surface of the copper wire;
[0040] Finally, rinse the surface of the copper wire with deionized water to remove possible residual hydrochloric acid solution, and finally dry it at 25°C for 30 minutes to complete the pretreatment of the copper wire.
[0041] Step 2: Etching the pretreated copper wire with an alkaline ammonia solution to obtain a superhydrophilic copper wire.
[0042] First, prepare the alka...
Embodiment 2
[0053] (1) Pretreatment: Straighten copper wires with diameters of 0.3 mm and 1 mm, then ultrasonically clean them in 1 mol / L acetone, absolute ethanol, and deionized water for 15 minutes, and then immerse in 1 mol / L hydrochloric acid solution. To remove the oxide layer, take it out after 10s, rinse the hydrochloric acid solution that may remain on the surface with deionized water, and finally dry it at 25°C for 30min.
[0054] (2) Preparation of superhydrophilic copper wire: Weigh 4g sodium hydroxide and 1.14g ammonium persulfate, add to 100mL deionized water simultaneously, fully stir, and use the copper wire obtained in step (1) as alkali ammonia solution Put it into the alkaline ammonia solution for etching, take it out after 15 minutes, clean it with absolute ethanol, and dry it at room temperature.
[0055] (3) Preparation of Janus-gradient composite wettability copper wire: configure 20mmol / L octadecyl mercaptan (C 18 h 38 S) and ethanol (C 2 h 6 O) mixed solution i...
Embodiment 3
[0058] (1) Pretreatment: straighten a copper wire with a diameter of 0.5 mm, then ultrasonically clean it in 1 mol / L acetone, absolute ethanol, and deionized water for 15 minutes, and then immerse it in 1 mol / L hydrochloric acid solution to remove oxidation. layer, take it out after 15s, rinse the hydrochloric acid solution that may remain on the surface with deionized water, and finally dry it at 30°C for 10min.
[0059] (2) Preparation of superhydrophilic copper wire: Weigh 4g sodium hydroxide and 1.14g ammonium persulfate, add to 100mL deionized water simultaneously, fully stir, and use the copper wire obtained in step (1) as alkali ammonia solution Put it into the alkaline ammonia solution for etching, take it out after 10 minutes, wash it with absolute ethanol, and dry it at room temperature.
[0060] (3) Preparation of Janus-gradient composite wettability copper wire: configure 10mmol / L octadecyl mercaptan (C 18 h 38 S) and ethanol (C 2 h 6 O) the mixed solution is u...
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