Entries with tag chemical concentration.

Researchers Replicate Mona Lisa in Miniature on Substrate

Georgia Institute of Technology researchers have drawn the Mona Lisa on a substrate surface approximately 30 microns in width. They created the black-and-white Mini Lisa to demonstrate a nanomanufacturing technique known as thermochemical nanolithography. The researchers generated the image pixel by pixel—each 125 nanometers from its neighbor—using varying heat intensities from a controlled, nanoscale chemical reaction in each location to produce the image’s different shades of gray. The demonstration shows the precision and control with which this process can produce chemical concentration gradients and variations on a sub-micrometer scale. The researchers say thermochemical nanolithography is accessible because atomic force microscopes are used, which are fairly common. . The method is also fast, and it could be used for patterning gradients in nanoelectronics, optoelectronics, and bioengineering. Researchers from the US Lawrence Berkeley and Pacific Northwest National Laboratories and from the University of Illinois at Urbana-Champaign collaborated on the project. The scientists published their work in the online journal Langmuir. (EurekAlert)(Georgia Institute of Technology)(Langmuir) 

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