Catalytic micromotor generating self-propelled regular motion through random fluctuation

Yamamoto, Daigo; Mukai, Atsushi; Okita, Naoaki; Yoshikawa, Kenichi; Shioi, Akihisa

doi:10.1063/1.4813791

Cited by 29 publications

(25 citation statements)

References 22 publications

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“…This work relies on previous research that has demonstrated that catalytic Pt micromotors powered by hydrogen peroxide show different forms of propulsion (i.e., active Brownian motion, translation, rotation, and spinning), depending on their shape. [17][18][19] Furthermore, we have clarified that the dynamical mode can be predicted by quantitative analysis of the twodimensional shape; we adapt these previously attested shapes to the tested reductant fuels. 17 Results and discussion Fig.…”

Section: Introductionmentioning

confidence: 97%

Micromotors working in water through artificial aerobic metabolism

et al. 2015

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Most catalytic micro/nanomotors that have been developed so far use hydrogen peroxide as fuel, while some use hydrazine. These fuels are difficult to apply because they can cause skin irritation, and often form and store disruptive bubbles. In this paper, we demonstrate a novel catalytic Pt micromotor that does not produce bubbles, and is driven by the oxidation of stable, non-toxic primary alcohols and aldehydes with dissolved oxygen. This use of organic oxidation mirrors living systems, and lends this new motor essentially the same characteristics, including decreased motility in low oxygen environments and the direct isothermal conversion of chemical energy into mechanical energy. Interestingly, the motility direction is reversed by replacing the reducing fuels with hydrogen peroxide. Therefore, these micromotors not only provide a novel system in nanotechnology, but also help in further revealing the underlining mechanisms of motility of living organisms.

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Section: Introductionmentioning

confidence: 97%

Micromotors working in water through artificial aerobic metabolism

et al. 2015

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“…However, the rods fabricated by Kovtyukho et al (2008) exhibit various types of regulated motions despite the similar shape. On the other hand, we investigated the relationship between the morphology of Pt particles and dynamical modes (Yamamoto et al, 2013). We demonstrated that even a spherical catalytic Pt particle shows more vigorous random motion (active Brownian motion) in hydrogen peroxide water than the usual Brownian motion in pure water, despite the fact that non-composite particles cannot break the symmetry of the local field, that is, the net driving force is zero.…”

Section: Simpler Catalytic Nano/micromotors Made Of a Single Metalmentioning

confidence: 99%

“…6a) (Note that it is not a nano/micromotor!) (Yamamoto et al, 2013) channel without rotations, which resembles a molecular motor walking along a microtubule. Although fluctuations cause random noise in the motion, the particle can exhibit an almost linear motion with constant velocity.…”

Section: Cr (B)mentioning

confidence: 99%

Self-Propelled Nano/Micromotors with a Chemical Reaction: Underlying Physics and Strategies of Motion Control

Yamamoto

Shioi

2015

KONA

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Nano/micromotors exhibiting regulated motions are ubiquitous in nature, with biological ones having highly sophisticated and functional properties. However, nano/micromotors have not been applied in the design of useful man-made chemical systems to our knowledge. In this article, we review artificial nano/micromotors that have been proposed in the last decade. The underlying physics is completely different from that of conventional macroscale motors. The viscous force dominates the regulated motion of a nano/micromotor, in which thermal fluctuation converts into active Brownian motion. To overcome the viscous force and sustain motion, motors driven by various types of mechanisms have been fabricated. We focus on chemical reaction propelled motors classified into catalytic and self-reacted ones because most biomotors move by consuming chemical energy. Furthermore, the directional control of artificial nano/micromotors by chemotaxis, external field, and confined space is also discussed. As this hot and challenging topic is still currently at a fundamental stage, practical research will be required for developing various applications. We expect that chemical systems mimicking elegant biological ones will be realized in the near future.

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“…† The mechanism responsible for these motions can be explained by the assumptions that the spatial unbalance of force or torque affects motion trajectories. 25 The propulsion force was controlled by the catalytic activity of platinum, and constant force/torque would be produced in the same manner as in composite motors. For example, when the platinum in the interior of the microtubule was not uniform, and thereby uneven bubble production in different places, the micromotor would exhibit circular, spin, and rotation motions.…”

Section: Optimization Of Motion Control Conditions Of the Microsensormentioning

confidence: 99%

Magnetic molecularly imprinted microsensor for selective recognition and transport of fluorescent phycocyanin in seawater

Zhong

et al. 2015

J. Mater. Chem. A

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Phycocyanin with excellent fluorescence characteristics and important physiological significance is an effective indicator for cyanobacterial bloom assessment due to its close relationship with cyanobacterial biomass. Molecularly imprinted polymers (MIPs) have attracted great interest owing to their recognition specificity; micromotor-driven targeted transport capability holds considerable promise. Herein, we propose an attractive magnetic microsensor for selective recognition, enrichment and transport of labelfree fluorescent phycocyanin by combining MIPs and catalytic micromotors. The MIP-based catalytic microsensor was fabricated using phycocyanin as the imprinting molecule, Ni (0.55%) as the magnetic navigation material, and Pt (24.55%) as the solid support/catalyst to facilitate free movement in solutions, as well as an additional magnetic field was employed for trajectory control. The autonomous selfpropulsion microsensor vividly displayed their motion states, presenting two different trajectories. The movement velocity was calculated based on the body-deformation model, suggesting a linear positive correlation between the velocity and hydrogen peroxide concentration, with a high average speed of 163 mm s À1. In addition, highly efficient targeted identification and enrichment abilities were demonstrated based on the magnetically imprinted layer. More excitingly, no obvious interference was found from complicated matrices such as seawater samples, along with real-time visualization of phycocyanin loading and transport. The sensing strategy would not only provide potential applications for rapid microscale monitoring of algae blooms, but also enrich the research connotations of protein imprinting.

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Catalytic micromotor generating self-propelled regular motion through random fluctuation

Cited by 29 publications

References 22 publications

Micromotors working in water through artificial aerobic metabolism

Micromotors working in water through artificial aerobic metabolism

Self-Propelled Nano/Micromotors with a Chemical Reaction: Underlying Physics and Strategies of Motion Control

Magnetic molecularly imprinted microsensor for selective recognition and transport of fluorescent phycocyanin in seawater

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