以树木为灵感的结构分级气凝与协同作用的水,盐和热传输用于高盐度的太阳能蒸发
Xiaomeng Zhao1, Heng Zhang1, Kit-Ying Chan1,2
1Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People's Republic of China.
Nano-micro letters
|June 17, 2024
概括
一种新型的气凝模仿树木运输,以实现有效的太阳能水蒸发. 这种设计优化了水,盐和热传输,即使在高盐度条件下也实现了高蒸发率.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 太阳能驱动的界面蒸发提供了一种节能的方法来解决全球缺水问题.
- 有效的太阳能蒸发需要材料,以促进水的运输,局部化热量,并防止盐的积累.
- 同时优化水,盐和热传输是具有挑战性的,因为它们的结合性质.
研究的目的:
- 开发一种由天然树木运输系统启发的新型结构分级气凝.
- 为了集体优化水,盐和热传输,以增强太阳能蒸发.
- 为了克服太阳能海水淡化中合运输现象的局限性.
主要方法:
- 一种形气凝的设计,具有类似根的风扇形微通道,用于吸水和盐的扩散.
- 在表面附近加入水平对齐的毛孔,以定位热量并最大限度地吸收太阳能.
- 在一个阳光照明下对气凝的蒸发性能进行实验测试,采用不同的NaCl度.
主要成果:
- 在3.5%重量%的NaCl溶液中,在7天内没有降解的情况下,达到2.09kg m−2 h−1的稳定蒸发率.
- 在20%重量%的NaCl溶液中,稳定的蒸发速率为1.94kgm−2h−1维持了8小时.
- 气凝设计成功地防止了盐晶的形成,并证明了长期的稳定性.
结论:
- 结构分级的气凝有效地优化了水,盐和热传输,以实现有效的太阳能蒸发.
- 这种仿生设计为太阳能净化水的挑战提供了一个新的微观结构解决方案.
- 开发的气凝显示出在海水淡化和水资源管理方面的实际应用的巨大潜力.
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