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Highly absorbent patch

26.12.2022

Scientists have been able to turn the hydrogel into a patch that can be folded like regular tissue and torn like paper.

Usually it is not a big problem for us to wipe the meadow with a rag or kitchen paper. But if you spilled a lot of water on the table, then cleaning can sometimes be annoying.

Scientists from the University of Maryland in the USA came to the rescue under the leadership of Srinivasa Raghavan. They developed a hydrogel fabric that absorbs three times more water or other water-based liquids than conventional fabric.

A hydrogel is a material consisting of polymer molecules that absorbs water well, but is not as macroscopically porous as cloth or paper.

The essence of the achievement of Raghavan and his colleagues is that they were able to turn the hydrogel into a patch that can be folded like a regular fabric and torn like paper.

To obtain the result, the researchers first soaked the hydrogel in acid, alkali, and other substances. Just like a mixture of baking soda and vinegar, the hydrogel then began to form bubbles of carbon dioxide, causing the material to foam a little.

The researchers then pressed the material thinly between two sheets of glass and treated it with ultraviolet light. Finally, they dipped it in a solution of alcohol and glycerin and dried it with a hair dryer. Thus, a soft and elastic hydrogel patch was made. A flat sheet retains its useful properties for at least a year when stored under everyday conditions.

The experiment showed that the hydrogel pad absorbed 25 milliliters of water thrown on the table in 20 seconds. On the other hand, an ordinary cloth left 40 percent water on the table under the same conditions.

During the experiment, the hydrogel also worked well with liquids thicker than water, such as blood.

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