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Technology at the tip of a golden hair

23.10.2006

Scientists from the USA figured out how to add a single molecule of a substance to the reactor, and at a strictly defined moment.

"Chemists have known for a long time that it is technically possible to control the release of individual molecules of drugs or reagents, but no one has tried to implement this idea. We have brought it to the end," says Professor Peter Searson from Johns Hopkins University. He and his colleagues specialize in growing nanowires from various metals using photolithography methods.

In this case, two pure gold electrode wires were needed. A long hydrocarbon molecule was attached to one of them using a gold-sulfur bond. A biomolecule was attached to the other end of the molecule, which needed to be introduced into the reactor at the right time.

When this moment came, a short current pulse was passed through the electrodes, the bond between gold and sulfur was broken and the molecule set off to float freely. After that, you can attach a new molecule to the electrode and repeat everything from the beginning.

"Our system is quite suitable for implantable chips, which ensure the timely release of drugs into the human body," says Professor Searson. "It will also help to carry out chemical reactions with extremely small amounts of a substance."

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>> Forward: The Polymer Diode Revolution Is Coming 22.10.2006

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