Nano-scaled In:SnO₂ TCOs as a novel technology for minimizing water evaporation.

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Surface water evaporation is a significant issue in arid regions and water resource management.
• Conventional methods for reducing evaporation often have limitations in efficiency, cost, or environmental impact.

Purpose of the Study:

• To validate a novel technique for reducing surface water evaporation using nanoscale Transparent Conducting Oxide (In:SnO2) coatings on a flexible polymeric substrate.
• To evaluate the optical and thermal properties of the In:SnO2 coatings and their effect on water temperature and evaporation rates.

Main Methods:

• Coating a flexible polymeric substrate with a nanoscale Indium Tin Oxide (In:SnO2) layer.
• Measuring the optical properties of the coating, specifically infrared radiation blockage and ultraviolet/visible light transmission.
• Monitoring water and coating surface temperatures under simulated solar exposure.
• Quantifying the reduction in surface water evaporation.

Main Results:

• The In:SnO2 coating effectively blocked over 60% of infrared solar radiation while allowing significant transmission of UV and visible light (up to 72.4%).
• The coatings maintained lower temperatures on the water surface and reservoir bottom, with temperature differences (TUP-Down) ranging from 5.01°C to 10.11°C.
• Significant reduction in surface water evaporation was observed as a direct result of the temperature regulation.

Conclusions:

• The In:SnO2/PET coatings present a viable and effective method for reducing surface water evaporation.
• This technique offers advantages over conventional methods, including optical selectivity, buoyancy, hydrophobicity, anti-biofouling properties, and potential cost-effectiveness.