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L1.08 - Dynamic Coupling at the Nanoscale 
April 7, 2015   11:15am - 11:30am

Understanding collective and emergent behaviors of active colloidal assemblies provides useful insights into the statistical physics of out-of-equilibrium systems, thereby enabling researchers to better engineer and utilize many body dynamics at the submicroscopic regime. Recently, there has been a surge in the development of model systems to investigate controlled transfer of energy from self-propelled microswimmers � such as bacteria, algae, and inorganic catalysts to their immediate surroundings. Herein with a series of experiments, we demonstrate that nanoscale catalytic swimmers also can distribute momentum around their vicinity, significantly influencing the motion of nearby passive tracers. We measured diffusion of polymer tracers during enzymatic catalysis using various analytical techniques such as dynamic light scattering, fluorescence correlation spectroscopy, and diffusion nuclear magnetic resonance spectroscopy. In all the measurements, the diffusion of tracers was found to enhance substantially during enzymatic turnover of substrates. The increase in tracer diffusion was found not only to depend on the tracer size but also on the total rate of reaction, which is similar to the observations reported for particles near active micron-scale swimmers.

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