跷跷板分子几何学
蒸发器
蒸发
缩放比例
海水淡化
太阳能淡化
材料科学
微尺度化学
化学工程
物理
化学
热力学
热交换器
数学
几何学
中微子
生物化学
数学教育
膜
核物理学
工程类
作者
Yi‐Zhou Chen,Hao‐Cheng Yang,Haonan Li,Jia‐Hui Xin,Chao Zhang,Ling‐Shu Wan,Zhi‐Kang Xu
出处
期刊:Small
[Wiley]
日期:2024-02-20
被引量:4
标识
DOI:10.1002/smll.202310952
摘要
Abstract Salt scaling poses a significant obstacle to the practical implementation of solar‐driven evaporation for desalination. Attempts to mitigate scaling by enhancing mass transfer often lead to a compromise in evaporation efficiency due to associated heat loss. In the present work, a novel seesaw evaporator with a Janus structure to harness scaling for periodic self‐descaling is reported. The seesaw evaporators are facilely fabricated by delignifying balsa wood and subsequently single‐sided spray‐coating it with soot and polydimethylsiloxane (PDMS). This unique Janus structure enables the evaporator to float on the brine while ensuring an ample supply of solution for evaporation. During evaporation, salt ions are transported directionally toward the cocked end of the evaporator to form scaling, triggering the seesaw evaporator to flip once a threshold is reached. The accumulated salts re‐dissolve back into the solution. By adjusting the tilt angle, the evaporator can achieve an impressive evaporation rate of up to 2.65 kg m −2 h −1 when evaporating an 8 wt.% NaCl solution. Remarkably, these evaporators maintain a stable evaporation rate during prolonged 120 h operation and produce ≈3.93–6.35 L m⁻ 2 ·day⁻¹ of freshwater from simulated brines when assembled into an evaporation device.
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