Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 44, Pages 6933-6938Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201402229
Keywords
bioinspired materials; cactus stems; cone arrays; fog collection
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Funding
- National Research Fund for Fundamental Key Projects [2013CB933000, 2012CB934100]
- National Natural Science Foundation [21121001, 91127025]
- Chinese Academy of Sciences [KJZD-EW-M01]
- 111 project [B14009]
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With the increasing world population and the rapid development of the global industry, clean water is becoming scarcer and scarcer. Means of translating latent water in fog to dominant available water, i.e., fog collection, therefore becomes highly desirable. Previously, it was demonstrated that the cactus O. Microdasys has an integrated fog collection system arising from the evenly distributed clusters of spines and trichomes on the cactus stem. Here, it is reported that the intersite of the clusters on the cactus stem is densely covered with cones, which are also capable of collecting water from fog efficiently. Inspired by these cones, using a simple method combining mechanical perforating and template replica technology, polydimethylsiloxane (PDMS) cone arrays are fabricated with different arrangements and the one in hexagonal arrangement proves to be more efficient due to the more turbulent flow filed around the staggered cones and the rapid directional movement of water drops along each cone. This investigation opens up new avenue to collect water efficiently and may also provide clues to research about dust filtering and smog removal, which is attracting increasing attention worldwide.
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