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Nano workers achieve consistent 3D structures
Before ultrasmall biological computing devices can be consistently created, scientists must master the difficult task of regularly assembling elements at the molecular level. A step in that direction occurred this week. IBM and university researchers have described precision methods developed to chemically size magnetic and semiconducting nanoparticles envisioned for use in future molecular computing systems.
This type of work could lead to 3D crystal structures, as opposed to the random mixtures of nanoparticles that have so far marked molecular computing. This is essential for consistent, predictable computing.
In a statement, IBM said lab workers had succeeded in manipulating particles' sizes in increments of less than one nanometer and had managed to tailor the experimental conditions so the particles would assemble themselves into repeating 3-D patterns.
"What excites us the most is that this is a modular assembly method that will let us bring almost any materials together," said Christopher Murray, manager of nanoscale materials and devices at IBM Research. "We've demonstrated the ability to bring together complementary materials with an eye to creating materials with interesting custom properties."
Materials for the experiments included lead selenide and magnetic iron oxide. Lead selenide is a semiconductor that has applications in infrared detectors and thermal imaging. Magnetic iron oxide is commonly used in the coatings for magnetic recording media.
For related images and animations: http://domino.research.ibm.com/Comm/bios.nsf/pages/selfassembly.html
For more information about IBM's nanotechnology research projects: http://www.research.ibm.com/pics/nanotech/
For Colin Johnson's take at EETimes
http://www.eet.com/story/OEG20030625S0025
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