Chemotaxis of nonbiological colloidal rods

Yiying Hong, Nicole M.K. Blackman, Nathaniel D. Kopp, Ayusman Sen, Darrell Velegol

Research output: Contribution to journalArticlepeer-review

310 Scopus citations


Chemotaxis is the movement of organisms toward or away from a chemical attractant or toxin by a biased random walk process. Here we describe the first experimental example of chemotaxis outside biological systems. Platinum-gold rods 2.0μm long exhibit directed movement toward higher hydrogen peroxide concentrations through "active diffusion." Brownian dynamics simulations reveal that no "temporal sensing" algorithm, commonly attributed to bacteria, is necessary; rather, the observed chemotaxis can be explained by random walk physics in a gradient of the active diffusion coefficient.

Original languageEnglish (US)
Article number178103
JournalPhysical Review Letters
Issue number17
StatePublished - Oct 26 2007

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Chemotaxis of nonbiological colloidal rods'. Together they form a unique fingerprint.

Cite this