Biomimetic-engineering design can replace spaghetti tangle of nanotubes in nove...(imited by the physical size of the heat ...)

Date:6/1/2009

imited by the physical size of the heat source itself. Buehler and Xu demonstrate that a simple geometric structure a branched-tree hierarchy of at least two branches sprouting off each branch is far more effective at heat dissipation than the non-hierarchical "spaghetti" of most existing CNT-based material.

They show that a single fiber (or branch) connected to the heat source, with 99 additional branched links between it and the heat sink, will provide the same dissipation effect as if 50 long fibers were connected directly to the heat source. If five carbon nanotubes are arranged in direct connection to the heat source, each of which uses this branched-tree hierarchical structure, the heat dissipation will be the equivalent of 250 direct connections from the heat source to an external heat sink.

"Our paper provides a breakthrough in the understanding of how nanostructural elements can be utilized effectively to bridge scales from the nano to macro through formation of hierarchical structures," said Xu. "The results could change the way nanodevices are designed and fabricated by enabling technological innovations for highly integrated systems."

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Contact: Denise Brehm brehm@mit.edu 617-253-8069 Massachusetts Institute of Technology, Department of Civil and Environmental Engineering Source:Eurekalert

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