As rising global temperatures threaten water security, particularly in regions like southern Africa, researchers are exploring innovative ways to prevent evaporation in dams and reservoirs. A recent study led by physicist Daniel Kwasi Kpeglo introduces a potential solution: a lightweight, floating nanomaterial cover designed to act as a selective filter for solar radiation.
The technology consists of a thin layer of transparent conducting oxide applied to a flexible plastic sheet. Unlike traditional covers or shade cloths that may block all light, this design is engineered to permit more than 60% of visible light to penetrate the surface, which is vital for maintaining aquatic ecosystems. Simultaneously, the material reflects over 80% of infrared radiation, the primary driver of heat-induced evaporation.
Laboratory tests demonstrated that the cover significantly cooled the water beneath it, with temperatures dropping by 10°C during peak sunlight hours. Because the material is water-repellent and lightweight, it floats directly on the surface without requiring heavy support structures. Furthermore, the researchers noted that the coating appears resistant to algae growth, which could reduce long-term maintenance requirements.
While the laboratory results are promising, the research team emphasizes that significant hurdles remain before the technology can be deployed in the field. Future efforts must focus on large-scale trials to assess the material's durability against wind, rain, and UV degradation. Additionally, engineers must develop robust anchoring systems to keep the sheets in place on large, active bodies of water and ensure the plastic substrate can withstand years of environmental exposure.
Source: The Conversation
暂无评论。快来发表第一条评论吧。