Pulsating Nanotubules Push Out Buckyballs | Chemical & Engineering News
Volume 90 Issue 39 | p. 30 | Concentrates
Issue Date: September 24, 2012

Pulsating Nanotubules Push Out Buckyballs

Stacked rings contract and expand in response to heating and cooling
Department: Science & Technology
News Channels: Nano SCENE, Materials SCENE
Keywords: Nanotubules, self-assembly, pulsating, C60, buckyballs
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Self-assembled nanotubule diameter shrinks from 11 nm to 7 nm when heated.
Credit: Myongsoo Lee
Two green tubes with silver coils around it. The one on the left is wider. A reversible-reaction arrow indicates that heat causes the expansion/contraction.
 
Self-assembled nanotubule diameter shrinks from 11 nm to 7 nm when heated.
Credit: Myongsoo Lee

Scientists have designed nanotubules that pulsate when exposed to changes in temperature. This motion, which mimics the pulsing of biological systems such as car­diac muscle cells, can be used to squeeze out encapsulated buckyball molecules, report Myongsoo Lee of Seoul National University and colleagues (Science, DOI: 10.1126/science.1224741). The work is “stunning and seminal,” Wei Zhang and Takuzo Aida of Japan’s RIKEN Advanced Science Institute say in an accompanying perspective, because the nanotubes could be made to convert thermal energy into anisotropic motion. Lee’s group’s design involves six bent amphiphilic aromatic molecules, which self-assemble to form rings. The bent molecules can slide past each other to expand or contract the ring’s diameter. The rings stack on top of each other to form tubes with a hydrophobic interior. In aqueous solution, the tubes contract and expand from 7 nm to 11 nm in diameter in response to being heated to 60 °C and cooled to room temperature, respectively. The group also made self-assembled tubes containing C60, which was expelled from the tube upon heating.

 
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