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Under-oil self-driven and directional transport of water on femtosecond laser-processed superhydrophilic geometry-gradient structure
摘要： Self-driven and continuous directional transport of water droplets in the oil environment has great potential applications in microfluidics, oil-water separation, etc. Nevertheless, most current studies exploit water behaviors occurring in air, and the directional regulation of water under a viscous oil medium remains a challenge. In this work, a superhydrophilic geometry-gradient stainless-steel platform with nanoparticles-covered nanoripples structure is proposed using femtosecond laser direct writing technology. The as-prepared sample spontaneously and directionally transported water droplets in the oil environment from the minor side to the large side of the trapezoidal platform surface, but not in the opposite direction. The transport velocity of water droplets as a function of trapezoid angle and tilt angle of the as-prepared platform was investigated in detail. In addition, the pumpless under-oil water transport platform was successfully prepared on other substrates including Ti and Ni sheets, polyimide film, and C cloth, and exhibited transport capabilities when the platform was flexed and combined into various shapes. This work offers insights for simple fabrication of a flexible and substrate-independent pumpless under-oil directional transport device for water.
关键词： femtosecond laser,superhydrophilic,under-oil,water droplets,directional transport
更新于2025-09-19 17:13:59
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Effects of Strategically Placed Water Droplets on Monolayer Growth of Molybdenum Disulfide
摘要： Two-dimensional (2D) molybdenum disulfide (MoS2) films with a tunable bandgap hold great promise for next-generation electronic and optoelectronic devices. Synthesis of large areas of high-quality MoS2 monolayers lacks experimental reproducibility. Moreover, the outcome of MoS2 growth by chemical vapor deposition is dependent on several interconnected growth parameters. In this study, we present results of MoS2 monolayer growth by strategically placing water droplets on the growth substrate and/or in the source prior to its loading in the growth chamber. The volume and distribution of water on the growth substrate and in the source had a direct impact on the morphology of the as-grown MoS2. Characterized by scanning electron microscopy (SEM), Raman microscopy, and atomic force microscopy (AFM), the number and size of MoS2 layers as well as its distribution on the growth substrate were found to have a strong dependence on the positioning of the water droplet. This study on MoS2 monolayer growth using water droplets as a promoter provides a simple and reproducible experimental technique enabling growth with high reliability.
关键词： molybdenum disulfide,water droplets,Raman microscopy,scanning electron microscopy,chemical vapor deposition,atomic force microscopy,monolayer growth
更新于2025-09-09 09:28:46