Rapid Fabrication of Bimetallic Spherical Motors

Wheat, Philip M.; Marine, Nathan A.; Moran, Jeffrey L.; Posner, Jonathan D.

doi:10.1021/la102218w

Cited by 121 publications

(152 citation statements)

References 31 publications

Supporting

Mentioning

148

Contrasting

Unclassified

Order By: Relevance

“…We previously reported that spherical bimetallic motors swim in H 2 O 2 in the same manner as bimetallic nanorods [30]. In addition to the translational velocities typical of bimetallic nanomotors, the spherical motors are also observed to possess a rotational velocity.…”

Section: Resultsmentioning

confidence: 79%

“…The motor translational swimming velocities are shown in Fig. 2 in hydrogen peroxide [6,26,27,30,36]. The motor angular velocities are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As seen in Fig. 2 of Wheat et al [30] the fabrication method results in uneven distribution of mass on the surface of the motors and the extra mass on one side of the sphere results in an asymmetric drag profile of the sphere. The swimming motor would experience a slight spin towards the region of higher drag (the area with extra mass) and the magnitude of the spin would scale linearly with the translational velocity since the drag force scales linearly with translational velocity at low Reynolds number [32].…”

Section: Resultsmentioning

confidence: 99%

“…We fabricate 3-μm bimetallic gold and platinum spherical micromotors using a multistep metal deposition process on polystyrene microspheres that we reported earlier [30]. In brief, a 1% volume fraction aqueous dispersion of 3-μm fluorescent polystyrene spheres (ρ = 1.05 g/cm 3 , Duke Scientific Inc, Fremont, CA, USA) are deposited onto a 2.5 × 2.5-cm 2 square glass substrate.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…We fabricate the motors using the multistep metal deposition process on polystyrene microspheres that we reported earlier [30]. We compare the behavior of these motors to Brownian dynamics simulations, simple analytical theory, and to previously published work by Ebbens et al [10].…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Diffusive behaviors of circle-swimming motors

Marine

Wheat

Ault³

et al. 2013

Phys. Rev. E

Self Cite

View full text Add to dashboard Cite

Spherical catalytic micromotors fabricated as described in Wheat et al. [Langmuir 26, 13052 (2010)] show fuel concentration dependent translational and rotational velocity. The motors possess short-time and long-time diffusivities that scale with the translational and rotational velocity with respect to fuel concentration. The short-time diffusivities are two to three orders of magnitude larger than the diffusivity of a Brownian sphere of the same size, increase linearly with concentration, and scale as v 2 /2ω. The measured long-time diffusivities are five times lower than the short-time diffusivities, scale as v 2 /{2D r [1 + (ω/D r ) 2 ]}, and exhibit a maximum as a function of concentration. Maximums of effective diffusivity can be achieved when the rotational velocity has a higher order of dependence on the controlling parameter(s), for example fuel concentration, than the translational velocity. A maximum in diffusivity suggests that motors can be separated or concentrated using gradients in fuel concentration. The decrease of diffusivity with time suggests that motors will have a high collision probability in confined spaces and over short times; but will not disperse over relatively long distances and times. The combination of concentration dependent diffusive time scales and nonmonotonic diffusivity of circle-swimming motors suggests that we can expect complex particle responses in confined geometries and in spatially dependent fuel concentration gradients.

show abstract

Section: Resultsmentioning

confidence: 79%

“…The motor translational swimming velocities are shown in Fig. 2 in hydrogen peroxide [6,26,27,30,36]. The motor angular velocities are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%