期刊
SOFT MATTER
卷 8, 期 18, 页码 5038-5042出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sm07282c
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资金
- Department of Science and Technology, Government of India
Slithering, crawling, slipping, and gliding are various modes of limbless locomotion that have been mimicked for micro-manipulation of soft, slender and sessile objects. A lesser known mode is rolling which involves periodic, asymmetric and lateral muscular deformations. Here we enable an elastomeric cylinder of poly( dimethylsiloxane) to roll on a substrate by releasing a small quantity of a solvent like chloroform, toluene, hexane, heptane and so on, which swells differentially a portion of the cylinder, but evaporates from the portion of it which remains exposed to the atmosphere. In a dynamic situation, this asymmetric swelling-shrinking cycle generates a torque which drives the cylinder to roll. The driving torque is strong enough that the cylinder can roll up an inclined plane, within a range of inclination, its velocity even increases. The cylinder can even drag a dead weight significantly larger, similar to 8 to 10 times its own weight. A scaling law is derived for optimizing the rolling velocity.
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