Directed rotational motion of microscale objects using interfacial tension gradients continually generated via catalytic reactions

Jeffrey M. Catchmark, Shyamala Subramanian, Ayusman Sen

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

The controlled, continuous directed rotational motion of microscale objects can be achieved using spatially defined catalytic regions. SiO 2 of 0.25μm was grown on n+ Si wafer and a seed metal layer consisting of 25 nm of chromium and 75 nm of gold was evaporated onto the oxide surface. A shipley 1827 positive photoresist was spun on the surface at 4000 rpm for 40 s, soft baked for 90 s at 110°C, was exposed through a mask for 3.5 s using a mercury lamp uv source calibrated to an exposure output of 12mWcm -2 on a Karl Suss MA-6 optical contact aligner. At the molecular scale, natural biological systems implement biomolecular motors, which acts as delivery vehicles and perform a wide variety of inter cellular functions. It was found that these motors are driven chemically through the catalytic hydrolysis of ATP, a chemical fuel present in the intercellular solution suspending these continuously operating motors.

Original languageEnglish (US)
Pages (from-to)202-206
Number of pages5
JournalSmall
Volume1
Issue number2
DOIs
StatePublished - Feb 1 2005

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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