In this work, superwetting alumina coating was coated onto flexible copper mesh by one-step laser cladding treatment. In order to understand the formation mechanism of microstructured coating, the dynamic temperature field distribution during laser cladding is investigated by establishing a three-dimensional finite element simulation model based on the transient thermal analysis method. As the heat source moves, the temperature of the substrate surface increases from room temperature to over 660℃, allowing the aluminum to reach its melting point where melting occurs on the substrate surface. The effect of laser power on the distribution of alumina nanoparticles deposited on copper mesh was further investigated in consideration of temperature field distribution. When the laser power was increased to 1.2 times the initial power, the maximum temperature of the cladding layer increased to about 1930℃, which facilitated the formation of smaller size nanoparticles. It was found that the as-prepared substrate transits from hydrophobicity in air with WCA~125 ° to superhydrophilicity in air with WCA near 0°, while turning oleophobicity with OCA 110°to superoleophobicity with OCA~160°underwater. Oil/water separation was performed on as-prepared superwetting alumina coating coated copper meshes to reveal the enhancement mechanism behind.
Metal nanoparticles fabricated from chemical methods exhibit various excellent properties with their unique physicochemical properties and structures. To address the problems of the complicated manufacturing process and the side products generation, laser ablation in aqueous environment is proposed as a facile and environment friendly method to fabricate nanoparticles, producing very limited impurities. Ag, TiO2 and Ag/TiO2 composite nanoparticles are fabricated under the irradiation of pulsed laser with surfactant dodecyl trimethyl ammonium bromide (DTAB) as the stabilizer. Assembly shape of surfactants could be tuned by controllable concentrations, resulting in different nanostructures of nanoparticles. The laser processing parameters and the stabilizer showed collaborative effect on the morphology design of metal colloid nanoparticles. SEM images showed different morphologies of Ag nanoparticles and evenly distributed TiO2 nanoparticles are obtained. Typical silver crystals and rutile titanium dioxide crystals was characterized by XRD patterns. The UV-visible spectrum reflected the effects of Ag nanoparticles synthesized under different concentrations of DTAB on the absorption wavelengths of silver and titanium dioxide composites.
Superhydrophobic surface has been widely studied on its theories and applications. Oil/water separation as one of its various applications shows great potential and attracts attention of researchers. In this paper, a round copper piece was used to fabricate an oil/water separation mesh by pulsed laser ablation and one-step simple chemical treatment. Based on the mechanism of hydrophobicity/lipophilicity, the fabricated copper mesh shows tunable excellent oil/water separation ability. Field emission scanning electron microscope (FESEM) was taken to study the surface morphology. Energy dispersive X-ray detector (EDX) shows the changes in surface chemical elements. Furthermore, by immersing in aqueous solutions with different PH values and the mechanical abrasion testing, the mesh still exhibits good superhydrophobicity, showing excellent stability in both harsh chemical environments and physical conditions. The fabrication approach can be flexibly scaled up to large-scale production, which has great potential applications in solving the problems of oil pollution.
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