研究目的
To develop an artificial functional metal surface with multi-directionally anisotropic wettability by selective laser texturing of aluminum alloy plates.
研究成果
The first time quadri-directionally anisotropic droplets sliding surface is prepared by a simple strategy of layer-by-layer selective laser subtractive ablation on the aluminum alloy surface. The periodic asymmetric multi-directional stairway (AMDS) pattern on the sample surfaces with the same riser height (RH) and unique unequal tread depth (TD) in four directions are ingeniously devised. Hierarchical laser-induced micro/nanostructures are superimposed to the AMDS arrayed superhydrophobic surface, which is endowed with the anisotropic adjustable droplets sliding property.
研究不足
The technical and application constraints of the experiments include the difficulty in improving the accurate sliding motion of the water droplets on a metallic surface because of its superhydrophobic nature. Potential areas for optimization include the development of an artificial functional metal surface with multi-directionally anisotropic wettability requiring the simultaneous precise control of both macro-scale anisotropic pattern and micro-nano scale superhydrophobic structures.
1：Experimental Design and Method Selection:
A self-built laser precision scanning system is used for the laser surface texturing process. The system includes an ultraviolet nanosecond pulsed laser, a beam expander, an X-Y galvo-scanner, and the telecentric lens. AISI 6061 aluminum alloy plates are selected as the sample substrates.
2：Sample Selection and Data Sources:
The as-received samples are cleaned in ethanol bath by an ultrasonic cleaner for 10 min and air-dried.
3：List of Experimental Equipment and Materials:
The system is comprised of an ultraviolet (355 nm wavelength) nanosecond pulsed laser (Awave-355, AptoWave, USA), a beam expander, an X-Y galvo-scanner, and the telecentric lens. AISI 6061 aluminum alloy plates (Nilaco Corp., Japan) with a dimension of 4 mm (width) × 4 mm (length) × 1 mm (thickness) are selected as the sample substrates.
4：Experimental Procedures and Operational Workflow:
A simple strategy of layer-by-layer selective laser subtractive ablation is designed to construct the unique periodic asymmetric multi-directional stairway (AMDS) pattern on the sample surfaces. Then the as-prepared samples are chemically modified by immersing into an alcohol solution with
5：3 wt% stearic acid at ambient temperature for 30 min, and baked on a hot plate at 120 °C for 60 min to achieve the superhydrophobicity. Data Analysis Methods:
A field-emission scanning electron microscope (FESEM, JSM-6500F, Jeol Co., Japan) is used to obtain the details of laser-ablated aluminum alloy surface morphology. A 3D laser scanning confocal microscope (OSL4100, OLYMPUS, Japan) is employed in mapping the geometric profiles. Static contact angles (SCAs), sliding angles (SAs) and the video of water droplets sliding process are measured using a video optic CA instrument (OCA15EC, Dataphysics) equipped with a goniometer.
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