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Technology using microwave heating may impact electronics manufacture
Date:6/10/2014

CORVALLIS, Ore. Engineers at Oregon State University have successfully shown that a continuous flow reactor can produce high-quality nanoparticles by using microwave-assisted heating essentially the same forces that heat up leftover food with such efficiency.

Instead of warming up yesterday's pizza, however, this concept may provide a technological revolution.

It could change everything from the production of cell phones and televisions to counterfeit-proof money, improved solar energy systems or quick identification of troops in combat.

The findings, recently published in Materials Letters, are essentially a "proof of concept" that a new type of nanoparticle production system should actually work at a commercial level.

"This might be the big step that takes continuous flow reactors to large-scale manufacturing," said Greg Herman, an associate professor and chemical engineer in the OSU College of Engineering. "We're all pretty excited about the opportunities that this new technology will enable."

Nanoparticles are extraordinarily small particles at the forefront of advances in many biomedical, optical and electronic fields, but precise control of their formation is needed and "hot injection" or other existing synthetic approaches are slow, costly, sometimes toxic and often wasteful.

A "continuous flow" system, by contrast, is like a chemical reactor that moves constantly along. It can be fast, cheap, more energy-efficient, and offer lower manufacturing cost. However, heating is necessary in one part of the process, and in the past that was best done only in small reactors.

The new research has proven that microwave heating can be done in larger systems at high speeds. And by varying the microwave power, it can precisely control nucleation temperature and the resulting size and shape of particles.

"For the applications we have in mind, the control of particle uniformity and size i
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Contact: Greg Herman
greg.herman@oregonstate.edu
541-737-2496
Oregon State University
Source:Eurekalert  

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