Passive water ascent in a tall, scalable synthetic tree
Passive water ascent in a tall, scalable synthetic tree
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DOI：
10.1038/s41598-019-57109-z
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发表时间：
2020-01-14
影响因子：
4.6
通讯作者：
Boreyko, Jonathan B.
中科院分区：
文献类型：
--
作者：
Shi, Weiwei;Dalrymple, Richard M.;Boreyko, Jonathan B.
树木的蒸腾循环是由叶片内产生的负水势提供动力的，负水势将水泵入密集的木质部导管阵列。合成树可以模仿这种蒸腾循环，但一直局限于通过单个微毛细管或微流体通道泵送水。在这里，我们制造了高大的合成树，水沿着一系列大直径管道上升，以使蒸腾作用在与天然树木相同的宏观尺度上。将19个毫米直径的管的阵列在一端嵌入纳米多孔陶瓷盘内，而它们的自由端浸没在蓄水池中。在通过在水下煮沸使合成树饱和之后，即使陶瓷盘被提升到水库上方3米以上，水也可以连续地沿着管道向上流动。一个理论的发展，揭示了两种不同的蒸腾模式：蒸发限制制度和流量限制制度。
The transpiration cycle in trees is powered by a negative water potential generated within the leaves, which pumps water up a dense array of xylem conduits. Synthetic trees can mimic this transpiration cycle, but have been confined to pumping water across a single microcapillary or microfluidic channels. Here, we fabricated tall synthetic trees where water ascends up an array of large diameter conduits, to enable transpiration at the same macroscopic scale as natural trees. An array of 19 tubes of millimetric diameter were embedded inside of a nanoporous ceramic disk on one end, while their free end was submerged in a water reservoir. After saturating the synthetic tree by boiling it underwater, water can flow continuously up the tubes even when the ceramic disk was elevated over 3 m above the reservoir. A theory is developed to reveal two distinct modes of transpiration: an evaporation-limited regime and a flow-limited regime.