During rare desert rainfalls, cacti waste no time sopping up and storing a storm's precious precipitation. Inspired by this natural phenomenon, scientists report in a study appearing ACS Macro Letters that they have developed a material that mimics cactus roots' ability to rapidly absorb and retain vast amounts of water with a minimal amount of evaporation.

They say this unique material could lead to new and improved cosmetics, medical devices and other everyday products.

Like all living things, cacti need water to survive. Yet they thrive in some of the world's driest places. The key is the plant's shallow, but extensive root system that quickly soaks up rainfall, which seldom penetrates more than just a few inches into the soil.

During droughts, the roots dehydrate and shrink, creating air gaps that prevent water from escaping back into the soil. Intrigued by these traits, Sang Joon Lee, Hyejeong Kim and Junho Kim wanted to create a durable material that could effectively absorb and store water, without changing other physical properties.

The research team sought to replicate the key features of the cactus root system. To imitate the cactus root and its outer covering, they made a material composed of cellulose fibers, agarose cyrogel and microparticles. Then, they made a cylindrical-shaped gel and freeze-dried it to form a structure that mimics the layered composition of cactus root epidermis.

Laboratory tests suggest that the resulting cactus-root-inspired material (CRIM) is capable of absorbing water nearly 930 times faster than it loses through evaporation. The researchers say the mixture of cellulose fibers, microparticles and cryogel is adjustable for particular needs.

For example, adding water-repellant microparticles to this system could produce CRIMs useful in oil separation and other oil-based engineering processes. They conclude that CRIMs could eventually have a host of applications in agriculture, cosmetics and medicine

Research paper

Related Links
American Chemical Society
Water News - Science, Technology and Politics

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Toxic levels of arsenic in Amazon basin well water: study
Vienna (AFP) April 12, 2018
Shallow wells dug for drinking water in the Amazon basin in order to avoid polluted rivers contain up to 70 times the recommended limit of arsenic, researchers warned Tuesday. Samples taken from 250 sites along the Amazon - the first systematic analysis of the region's well water - also revealed hazardous levels of manganese and aluminium, they reported at a conference in Vienna. "Faced with polluted rivers, many rural communities rely on groundwater as a source of drinking water," lead resea ... read more