Catalytic Nanomotors: Autonomous Movement of Striped Nanorods.

Paxton, Walter F.; Kistler, Kevin C.; Olmeda, Christine C.; Sen, Ayusman; Angelo, Sarah K. St.; Cao, Yanyan; Mallouk, Thomas E.; Lammert, Paul E.; Crespi, Vincent H.

doi:10.1002/chin.200452205

Cited by 316 publications

(449 citation statements)

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“…1,2,3,4 New lab-made colloids can be now designed not only tailoring precisely the size, surface functionalities and interactions but also rendering their motion directional and controllable, overcoming the limitation of random Brownian walks. 1,2,3,4 New lab-made colloids can be now designed not only tailoring precisely the size, surface functionalities and interactions but also rendering their motion directional and controllable, overcoming the limitation of random Brownian walks.…”

Section: Introductionmentioning

confidence: 99%

Enhanced active motion of Janus colloids at the water surface

et al. 2015

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We have investigated the active motion of self-propelled colloids confined at the air-water interface and explored the possibility of enhancing the directional motion of self-propelled Janus colloids by slowing down their rotational diffusion. The two dimensional motion of micron-sized silica-platinum Janus colloids has been experimentally measured by particle tracking video-microscopy at increasing concentrations of the catalytic fuel, i.e. H2O2. Compared to the motion in the bulk, a dramatic enhancement of both the persistence length of trajectories and the speed has been observed. The interplay of colloid self-propulsion, due to an asymmetric catalytic reaction occurring on the colloid, surface properties and interfacial frictions controls the enhancement of the directional movement. The slowing down of the rotational diffusion at the interface, also measured experimentally, plays a pivotal role in the control and enhancement of active motion.

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Section: Introductionmentioning

confidence: 99%

Enhanced active motion of Janus colloids at the water surface

et al. 2015

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“…Self-phoretic particles (13) induce local gradients (e.g., in the electric potential) that propel particle motions through interfacial "phoretic" effects (e.g., electrophoresis) (14). By engineering the shape and symmetry of such particles, different dynamical behaviors have been realized, including linear (15)(16)(17), rotational (18,19), and circular (20) motions. The variety of possible dynamics for self-phoretic particles in isotropic media is significantly limited by the translational and rotational invariance of particle motions (only helical trajectories have yet to be reported).…”

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confidence: 99%

Shape-directed dynamics of active colloids powered by induced-charge electrophoresis

Brooks

Sabrina

Bishop

2018

Proc. Natl. Acad. Sci. U.S.A.

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The symmetry and shape of colloidal particles can direct complex particle motions through fluid environments powered by simple energy inputs. The ability to rationally design or "program" the dynamics of such active colloids is an important step toward the realization of colloidal machines, in which components assemble spontaneously in space and time to perform dynamic (dissipative) functions such as actuation and transport. Here, we systematically investigate the dynamics of polarizable particles of different shapes moving in an oscillating electric field via induced-charge electrophoresis (ICEP). We consider particles from each point group in three dimensions (3D) and identify the different rotational and translational motions allowed by symmetry. We describe how the 3D shape of rigid particles can be tailored to achieve desired dynamics including oscillatory motions, helical trajectories, and complex periodic orbits. The methodology we develop is generally applicable to the design of shape-directed particle motions powered by other energy inputs.

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“…[1][2] They self-propel by harvesting chemical energies from fuels in suspension, such as hydrogen peroxide. [18][19] Recently, substantial research efforts have been focused on strategically designing and fabricating catalytic nanomotors with an array of compositions and geometries, such as bimetallic nanorods, [18][19][20] catalytic microtubes, [21][22][23] and Janus particles [24][25][26][27] . The efforts lead towards dramatic improvement of propulsion speeds up to hundreds of μm/sec (or 100 body lengths per second), [19][20][21] and readiness in harnessing energy from a variety of fuels, such as hydrazine, 28 urea [29][30] and even pure water 13,26 .…”

Section: Introductionmentioning

confidence: 99%

Electric-Field-Guided Precision Manipulation of Catalytic Nanomotors for Cargo Delivery and Powering Nanoelectromechanical Devices

et al. 2018

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ABSTRACT:We report a controllable and precision approach in manipulating catalytic nanomotors by strategically applied electric (E-) fields in three dimensions (3-D). With the high controllability, the catalytic nanomotors have demonstrated new versatility in capturing, delivering, and releasing of cargos to designated locations as well as in-situ integration with nanomechanical devices (NEMS) to chemically power the actuation. With combined AC and DC E-fields, catalytic nanomotors can be accurately aligned by the AC E-fields and instantly change their speeds by the DC E-fields. Within the 3-D orthogonal microelectrode sets, the in-plane transport of catalytic nanomotors can be swiftly turned on and off, and these catalytic nanomotors can also move in the vertical direction. The interplaying nanoforces that govern the propulsion and alignment are investigated. The modeling of catalytic nanomotors proposed in previous works has been confirmed quantitatively here. Finally, the prowess of the precision manipulation of catalytic nanomotors by E-fields is demonstrated in two applications: the capture, transport, and release of cargos to pre-patterned microdocks, and the assembly of catalytic nanomotors on NEMS to power the continuous rotation. The innovative concepts and approaches reported in this work could further advance ideal applications of catalytic nanomotors, e.g. for assembling and powering nanomachines, nanorobots, and complex NEMS devices.

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Catalytic Nanomotors: Autonomous Movement of Striped Nanorods.

Cited by 316 publications

References 1 publication

Enhanced active motion of Janus colloids at the water surface

Enhanced active motion of Janus colloids at the water surface

Shape-directed dynamics of active colloids powered by induced-charge electrophoresis

Electric-Field-Guided Precision Manipulation of Catalytic Nanomotors for Cargo Delivery and Powering Nanoelectromechanical Devices

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