Abstract
It has been mentioned in Chap. 3, that cactus spines and spider silk take advantage of the conical geometry to drive water droplets by Laplace pressure gradient for water transport and storage/use, before they are evaporated. Bioinspired surfaces with conical geometry for water harvesting from fog and/or condensation of water vapor have been inspired by the cactus spine and spider silk (Bhushan in Biomimetics: bioinspired hierarchical-structured surfaces for green science and technology. Springer International, Cham, 2018; Philos. Trans. R. Soc. A 377:20190119, 2019). In addition, triangular geometries on flat surfaces, inspired by cactus spines, have been pioneered by Song and Bhushan (Philos Trans R Soc A 377:20180335, 20190127, 20190128, 2019a; J Colloid Interface Sci 557:528–538, 2019d) for water harvesting from fog and/or condensation of water vapor.
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