"How nonstick pans transfer to nonstick toilets" - Jing Wang - Webinar on EASF скачать в хорошем качестве

"How nonstick pans transfer to nonstick toilets" - Jing Wang - Webinar on EASF

LESS Coating Technology is published on Nature Sustainability: https://www.nature.com/articles/s4189... 4 billion people in the world are facing severe water scarcity. To address this problem, mainstream research has been focused on desalination of brine, water harvesting from air, etc. However, the effort to reduce water consumption in daily life has not received enough attention. For example, more than 141 million m^3 of fresh water is flushed away in toilets every day globally, nearly 6 times as much as the daily water consumption of the entire Africa population. To reduce the flushing water, toilet surfaces need to repel sticky viscoelastic solid (e.g. human fecal waste). Here, we create a design criterion for viscoelastic solid repellent coatings, and develop a facile, scalable coating method for materials in toilets, which significantly reduces the adhesion of the human fecal waste and saves considerable amount of flushing water. Specifically, we demonstrate that our designed liquid-entrenched smooth surfaces (LESS) [1] are only 10% of the adhesion of untreated smooth surfaces to synthetic human feces, and saves up to 90% of water used for cleaning untreated surfaces. In addition, LESS show great anti-bacteria performance, even better comparing to slippery liquid-infused porous surfaces (SLIPS) with underlying surface roughness. With all the function of LESS, we provide a lubricant replenishment strategy to address the concern of coating longevity, and we demonstrate its effectiveness on maintaining the coating’s functionality from both physics modeling and real testing. We believe that the slippery coating in this study provides new possibilities in solving small problems in daily life; while contributing globally to the mitigation of the water scarcity, as well as improving quality of life in developing regions. [1] Jing Wang, Lin Wang, Nan Sun, Ross Tierney, Hui Li, Margo Corsetti, Leon Willams, Pak Kin Wong, and Tak-Sing Wong, “Viscoelastic Solid Repellent Coatings for Extreme Water-Saving and Global Sanitation ”, Nature Sustainability, doi:10.1038/s41893-019-0421-0 (2019).