Scientists at Northwestern University have demonstrated a new nano-printing technology by printing the Beijing Olympics emblem 15,000 times, each logo so small the whole print run fits inside one square centimeter. 2,500 of the images, made 20,000 90-nanometer dots, would fit on a grain of rice. The polymer pen lithography uses an array of millions of tiny flexible polymer "pens" that can be used to make marks on various different nano-scales, and in this case deposit "ink" made of 16-mercaptohexadecanoic acid onto a gold substrate (what else would do, in Olympic season?) The team thinks that the technique, which can print out tiny dot-matrix imagery, will find uses in computational tools, medical diagnostics and the pharmaceutical industry. The study is published today in Science Express. [Physorg]

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