Coatings have simple recipe for success

Cheap approach, natural ingredients may prove useful in foods, medicines

By Rachel Ehrenberg, 11:11 AM July 26, 2013

It’s not often that chemists find a quick, simple and cheap method for making things using widely available ingredients, but researchers have done just that: They’ve created elegant little capsules and coatings in water simply by mixing iron and a compound from plants called tannic acid. The soft coatings form on their own around whatever else is in the water — glass beads, bacteria, gold nanoparticles and more. Just changing the solution’s pH can prompts the coatings to disassemble.

The coati...

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