miércoles, 14 de noviembre de 2007

Glue That Sticks to Nearly Everything

Researchers at Northwestern University designed the polymer to mimic a protein-based glue that mussels use to attach themselves to rocks, wood, plastic, and steel--indeed, just about any material they encounter. The researchers, led by Phillip Meessersmith, a professor of biomedical engineering and materials science and engineering at Northwestern, identified an easy-to-make compound similar to active elements in this mussel glue. They found that under the right conditions, the compound forms an extremely thin polymer film on the surface of just about any material that it's applied to. This film can in turn chemically bind to a wide variety of materials that have useful functions.
The new adhesive will allow nearly any object to be easily and inexpensively coated with a veneer of metal or some other functional material, including materials that keep objects free of bacteria or encourage the growth of specific types of cells. The coatings would be thin enough that they wouldn't change the shape of the underlying object; a surgical instrument. One application that the Northwestern researchers have been exploring is water filters that use tiny pellets coated with the adhesive. As water runs through a cylinder full of the pellets, the adhesive pulls toxic metals out of the water by binding to them.
The researchers have also demonstrated that the adhesive can be carved into intricate patterns through conventional microlithography. If a solution containing metal salts washes over such a pattern, metal will stick only to the adhesive. This could be a way to print electronic circuits onto just about any object. Deposited on a flexible substrate, such circuits could be useful for flexible displays. The ability to create microscopic patterns of organic materials could also be useful to biologists. The Northwestern researchers have demonstrated that it's possible to create coatings that bind to a specific type of acid important for blood-vessel growth and stem-cell differentiation. The ability to deposit precise patterns of this and other organic materials could make it easier to build microfluidic devices that help explain biological mechanisms.

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