Dynamic interactions between fast microscale rotors

Yang Wang, Shih To Fei, Young Moo Byun, Paul Edward Lammert, Vincent Henry Crespi, Ayusman Sen, Thomas E. Mallouk

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

(Figure Presented) Trimetallic catalytic microrotors were fabricated by electrodeposition of cylindrical Au-Ru rods in the pores of anodic alumina membranes, dissolution of the template membrane, and then sequential vapor deposition of Cr, SiO2, Cr, Au, and Pt on one side of each rod. This design provides two force vectors for the catalytic motor, including one perpendicular to the rod axis. The rods rotated rapidly (∼180 rpm) in 15% aqueous H2O2 solution with minimal orbital or translational movement. The rotation was rapid enough to observe qualitatively different interactions between pairs of co- and counter-rotating rods. Counter-rotating rods were able to approach each other closely and underwent frequent tip-to-tip collisions. Co-rotating rods could approach each other only to a distance of ∼0.9 μm. This difference is rationalized on the basis of shear forces generated by the catalytically driven rotation of the rods.

Original languageEnglish (US)
Pages (from-to)9926-9927
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number29
DOIs
StatePublished - Jul 29 2009

Fingerprint

Rotors
Electroplating
Membranes
Vapor deposition
Aluminum Oxide
Electrodeposition
Dissolution
Alumina

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Wang, Yang ; Fei, Shih To ; Byun, Young Moo ; Lammert, Paul Edward ; Crespi, Vincent Henry ; Sen, Ayusman ; Mallouk, Thomas E. / Dynamic interactions between fast microscale rotors. In: Journal of the American Chemical Society. 2009 ; Vol. 131, No. 29. pp. 9926-9927.
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Dynamic interactions between fast microscale rotors. / Wang, Yang; Fei, Shih To; Byun, Young Moo; Lammert, Paul Edward; Crespi, Vincent Henry; Sen, Ayusman; Mallouk, Thomas E.

In: Journal of the American Chemical Society, Vol. 131, No. 29, 29.07.2009, p. 9926-9927.

Research output: Contribution to journalArticle

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AU - Wang, Yang

AU - Fei, Shih To

AU - Byun, Young Moo

AU - Lammert, Paul Edward

AU - Crespi, Vincent Henry

AU - Sen, Ayusman

AU - Mallouk, Thomas E.

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N2 - (Figure Presented) Trimetallic catalytic microrotors were fabricated by electrodeposition of cylindrical Au-Ru rods in the pores of anodic alumina membranes, dissolution of the template membrane, and then sequential vapor deposition of Cr, SiO2, Cr, Au, and Pt on one side of each rod. This design provides two force vectors for the catalytic motor, including one perpendicular to the rod axis. The rods rotated rapidly (∼180 rpm) in 15% aqueous H2O2 solution with minimal orbital or translational movement. The rotation was rapid enough to observe qualitatively different interactions between pairs of co- and counter-rotating rods. Counter-rotating rods were able to approach each other closely and underwent frequent tip-to-tip collisions. Co-rotating rods could approach each other only to a distance of ∼0.9 μm. This difference is rationalized on the basis of shear forces generated by the catalytically driven rotation of the rods.

AB - (Figure Presented) Trimetallic catalytic microrotors were fabricated by electrodeposition of cylindrical Au-Ru rods in the pores of anodic alumina membranes, dissolution of the template membrane, and then sequential vapor deposition of Cr, SiO2, Cr, Au, and Pt on one side of each rod. This design provides two force vectors for the catalytic motor, including one perpendicular to the rod axis. The rods rotated rapidly (∼180 rpm) in 15% aqueous H2O2 solution with minimal orbital or translational movement. The rotation was rapid enough to observe qualitatively different interactions between pairs of co- and counter-rotating rods. Counter-rotating rods were able to approach each other closely and underwent frequent tip-to-tip collisions. Co-rotating rods could approach each other only to a distance of ∼0.9 μm. This difference is rationalized on the basis of shear forces generated by the catalytically driven rotation of the rods.

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