title: Magnetic microkayaks: propulsion of microrods precessing near a surface by kilohertz frequency, rotating magnetic fields.
abstract: Surface-swimming nano- and micromotors hold significant potential for on-chip mixing, flow generation, sample manipulation, and microrobotics. Here we describe rotating microrods magnetized nearly orthogonally to their long axes. When actuated near a solid surface, these microrods demonstrate precessing motion, with rods describing a double cone similar to the motion of a kayaker's paddle. The precessing motion induces translation. At 1 kHz, these "microkayaks" move at translational velocities of ≈14 μm s-1and generate advective flows up to 10 μm s-1.
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: L O
authors.initials: LO
authors.lastname: Mair
authors.affiliation: Department of Physics, Elon University, CB# 2625, Elon, North Carolina 27244, USA.
authors.forename: E E
authors.initials: EE
authors.lastname: Evans
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Nacev
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: P Y
authors.initials: PY
authors.lastname: Stepanov
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: R
authors.initials: R
authors.lastname: Hilaman
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Chowdhury
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Jafari
authors.affiliation: School of Material Sciences and Engineering, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, China 518055.|Center for Soft and Living Matter, Institute of Basic Sciences, Ulsan, Korea.
authors.forename: W
authors.initials: W
authors.lastname: Wang
authors.affiliation: Fischell Department of Bioengineering, University of Maryland, College Park, USA.
authors.forename: B
authors.initials: B
authors.lastname: Shapiro
authors.affiliation: Weinberg Medical Physics, Inc., North Bethesda, Maryland 20817, USA. Lamar.Mair@gmail.com.
authors.forename: I N
authors.initials: IN
authors.lastname: Weinberg