Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies

Jason J. Benkoski, Jennifer L. Breidenich, O. Manuel Uy, Allen T. Hayes, Ryan M. Deacon, H. Bruce Land, Jane M. Spicer, Pei Yuin Keng, Dong-Chul Pyun

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Modeled after the design of eukaryotic protozoa, we fabricated artificial microscopic swimmers through the dipolar assembly of a bidisperse mixture of 250 nm superparamagnetic magnetite colloids and 24 nm ferromagnetic cobalt nanoparticles. The cobalt nanoparticles self-assemble into long, 1-D chains measuring approximately 24 nm × 5 m. These chains then co-assemble with the magnetite beads to form "head" + "tail" structures. These types of asymmetric "flagella-like" colloidal assemblies were formed and maintained solely through dipolar interactions and is the first demonstration using randomly mixed dispersions of disparate magnetic colloids. When actuated by a pair of orthogonal static and sinusoidal magnetic fields, they undergo an asymmetric undulation that is the essential condition for locomotion at low Reynolds numbers. Based upon their shape, size, and articulation, these assemblies are potentially among the smallest structures capable of overcoming Brownian motion to perform useful locomotion. In addition to the head and tail structure, a variety of irregular structures formed that were incapable of swimming. A design of experiments (DOE) study was therefore implemented to optimize the production of artificial swimmers within a large parameter space that included concentration, the amount of sonication, and magnetic field strength. The artificial swimmers were most prevalent for intermediate concentrations of Co and magnetite particles. Statistical analysis suggested that the permanent dipole of the Co nanoparticles stimulated the assembly of the bidisperse mixture into complex, heterogeneous structures. Demonstration of in situ imaging of the magnetic actuation of these dipolar NP assemblies was conducted by optical microscopy.

Original languageEnglish (US)
Pages (from-to)7314-7325
Number of pages12
JournalJournal of Materials Chemistry
Volume21
Issue number20
DOIs
StatePublished - May 28 2011

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Ferrosoferric Oxide
Nanoparticles
Magnetite
Colloids
Cobalt
Demonstrations
Protozoa
Magnetic fields
Sonication
Brownian movement
Dispersions
Design of experiments
Optical microscopy
Statistical methods
Reynolds number
Imaging techniques

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Benkoski, J. J., Breidenich, J. L., Uy, O. M., Hayes, A. T., Deacon, R. M., Land, H. B., ... Pyun, D-C. (2011). Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies. Journal of Materials Chemistry, 21(20), 7314-7325. https://doi.org/10.1039/c0jm04014b

Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies. / Benkoski, Jason J.; Breidenich, Jennifer L.; Uy, O. Manuel; Hayes, Allen T.; Deacon, Ryan M.; Land, H. Bruce; Spicer, Jane M.; Keng, Pei Yuin; Pyun, Dong-Chul.

In: Journal of Materials Chemistry, Vol. 21, No. 20, 28.05.2011, p. 7314-7325.

Research output: Contribution to journalArticle

Benkoski, JJ, Breidenich, JL, Uy, OM, Hayes, AT, Deacon, RM, Land, HB, Spicer, JM, Keng, PY & Pyun, D-C 2011, 'Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies', Journal of Materials Chemistry, vol. 21, no. 20, pp. 7314-7325. https://doi.org/10.1039/c0jm04014b
Benkoski JJ, Breidenich JL, Uy OM, Hayes AT, Deacon RM, Land HB et al. Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies. Journal of Materials Chemistry. 2011 May 28;21(20):7314-7325. https://doi.org/10.1039/c0jm04014b
Benkoski, Jason J. ; Breidenich, Jennifer L. ; Uy, O. Manuel ; Hayes, Allen T. ; Deacon, Ryan M. ; Land, H. Bruce ; Spicer, Jane M. ; Keng, Pei Yuin ; Pyun, Dong-Chul. / Dipolar organization and magnetic actuation of flagella-like nanoparticle assemblies. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 20. pp. 7314-7325.
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