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Volume 13 Issue 6, June 2018

When light becomes water

Solar water evaporation has the potential to offer an attractive method of energy harvesting for water desalination and purification. To fare well in real-life applications, this technology requires cost-effective, high-performance and compact solar vapour generators. Zhao, Zhou and co-workers have designed a hierarchically nanostructured gel formulated of hydrophilic polyvinyl alcohol (PVA) and light absorbing polypyrrole (PPy) capable of fast and efficient solar energy conversion into pure water. The water collected in a PVA network can rapidly diffuse via multiple micron channels and internal gaps, allowing the PVA molecular meshes to replenish with water to match high-rate vapour generation. The cover image represents water molecules confined in the molecular mesh of the PVA network.

See Zhao, F et al.

Image: Ella Maru Studio. Cover Design: Alex Wing

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