Magnets harnessed to clean artwork
Sponges filled with iron nanoparticles make lifting dirt easy.
When a priceless work of art becomes dirty, running it through the dishwasher obviously isn't an option. But even the most sensitive of modern cleaning techniques come with problems — which one researcher says he can solve with a gel sponge and a magnet.

Comments
In this article, you mention "as the upper surface of the gel dries during the cleaning process, and osmotic pressure gradient...pulls the cleaning solution back into the sponge." I have been scouring the Langmuir paper, and I cannot find where that comes from! Is there a reference I should see? Thank you!
Posted by: Katie Brown | September 13, 2007 07:28 PM