Penn State Center for Nanoscale Science
This presentation is the property of its rightful owner.
Sponsored Links
1 / 1

Moses Chan, Director, DMR-0213623 PowerPoint PPT Presentation


  • 62 Views
  • Uploaded on
  • Presentation posted in: General

Penn State Center for Nanoscale Science. Direction of motion. Pt. Au. Moses Chan, Director, DMR-0213623. Nano- and Microscale Motors Powered by Catalytic Reactions.

Download Presentation

Moses Chan, Director, DMR-0213623

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Moses chan director dmr 0213623

Penn State Center for Nanoscale Science

Direction of motion

Pt

Au

Moses Chan, Director, DMR-0213623

Nano- and Microscale Motors Powered by Catalytic Reactions

We are investigating micro/nanoscale motors driven by interfacial tension gradients generated in catalytic reactions. While catalytically driven motion on the nanoscale is ubiquitous in biology, it was previously unknown in artificial systems. Our first achievement was to make segmented nanorods with catalysts at one end. In aqueous hydrogen peroxide we observed directional autonomous movement up to 9 m/sec. By adding magnetic Ni stripes for “steering,” we have made magnetotactic rods that are propelled parallel to an applied magnetic field. The speed of this movement is comparable to that of multi-flagellar bacteria, such as bacillus cereus). We have also demonstrated controlled rotational movement of a free gear measuring ~100 m in diameter using interfacial tension gradients, and are developing microfluidic pumps based on catalytically driven movement of fluids over patterned surfaces.

Real-time video of catalyzed motion: Au-Pt nanorods in hydrogen peroxide solution

W. Paxton et al., J. Am. Chem. Soc. 2004, 126, 13424.

T. Kline et al., Angew. Chem. Int. Ed. Engl., in press.

J. Catchmark, et al., Small, in press.

A fabricated Au gear with Pt catalysts on the gear teeth.

MRI


  • Login