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  • 07 December, 2020

  • 3 Min Read



A team of researchers at the Indian Institute of Technology-Guwahati (IIT-G) have developed a method for harvesting water from humid air.

About the Method

  • This method involves spraying a sponge-like porous polymeric material on a normal printer paper.
  • This method can also be used in underwater hulls of ships and submarines to prevent bio-fouling; and to prevent icing on aircraft windows.
  • The method mainly uses the principle of hydrophobicity. The lotus leaves exhibit the property of hydrophobicity.
  • They used ‘Slippery liquid-infused porous surface’ (SLIPS) to effectively harvest water from foggy air.
  • The SLIPS are capable of harvesting water from air without the use of an external cooling arrangement.
  • Conventionally, the Atmospheric water generator (AWG) that extracts water from humid ambient air, uses condensation, exposing to desiccants or pressurizing water.

Atmospheric Water Generator

  • The main principle of operation is condensation.
  • Here the water vapour in the air is extracted as water by pressuring the air, cooling the air below its dew point and exposing the air to dessicants.
  • A Dessicant is a hygroscopic substance.
  • Dew Point is the point to which air should be cooled to make its saturated with water vapour. When cooled further, it will condense into liquid water (or dew).

Source: TH

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