Fuel‐Free Nanocap‐Like Motors Actuated Under Visible Light

Wang, Xu; Sridhar, Varun; Guo, Surong; Talebi, Nahid; Miguel-López, Albert; Hahn, Klaus-Uwe; Aken, Peter A. van; Sánchez, Samuel

doi:10.1002/adfm.201705862

Cited by 57 publications

(69 citation statements)

References 69 publications

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“…In addition to quantum dots, other inorganic photosensitive materials were considered to generate motion including Au/TiO 2 nanocaps and Janus swimmers made of Ag/AgCl deposited onto polystyrene spheres (Figures C‐i,ii), taking advantage of the surface plasmon resonance of Au and Ag, reaching velocities up to ≈2.8 and 4.9 µm s −1 , respectively. The trajectories of swimmers were assessed (Figure C‐iii), showing a general decrease in velocity, ranging from 3.5–4.0 µm s −1 , or 2.5–3.5 µm s −1 for two‐ and three‐particle assemblies, respectively.…”

Section: Externally Driven Nano‐ and Micromotorsmentioning

confidence: 99%

Recent Advances in Nano‐ and Micromotors

Fernández-Medina

Ramos-Docampo

Hovorka

et al. 2020

Adv Funct Materials

160

143

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Nano‐ and micromotors are fascinating objects that can navigate in complex fluidic environments. Their active motion can be triggered by external power sources or they can exhibit self‐propulsion using fuel extracted from their surroundings. The research field is rapidly evolving and has produced nano/micromotors of different geometrical designs, exploiting a variety of mechanisms of locomotion, being capable of achieving remarkable speeds in diverse environments ranging from simple aqueous solutions to complex media including cell cultures or animal tissue. This review aims to provide an overview of the recent developments with focus on predominantly experimental demonstrations of the various motor designs developed in the past 24 months. First, externally driven motors are discussed followed by considering fuel‐driven approaches. Finally, a short future perspective is provided.

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Section: Externally Driven Nano‐ and Micromotorsmentioning

confidence: 99%

Recent Advances in Nano‐ and Micromotors

Fernández-Medina

Ramos-Docampo

Hovorka

et al. 2020

Adv Funct Materials

160

143

View full text Add to dashboard Cite

show abstract

“…Similar interaction of plasmons with light in TiO2-coated Au nanoparticles was presented in [28]. The reflectance level near ω0 is decreased significantly, and the transmittance bandwidth is expanded with by thinning the individual layers and increasing their number.…”

Section: Features Of Light Reflection Spectramentioning

confidence: 59%

“…Similar interaction of plasmons with light in TiO 2 -coated Au nanoparticles was presented in [28]. Figure 6 demonstrates the complex influence of the Ag/TiAlN coatings architecture on their reflectance.…”

Section: Features Of Light Reflection Spectramentioning

confidence: 61%

Interconnections between Electronic Structure and Optical Properties of Multilayer Nanolaminate TiAlN/Ag and Al2O3/Ag Coatings

et al. 2018

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Abstract:Multilayer nanolaminate TiAlN/Ag and Al 2 O 3 /Ag metal-insulator-metal (MIM) coatings with thicknesses of individual layers from a few to several hundreds of nanometers were fabricated by direct current magnetron sputtering. Their optical transmittance and reflectance spectra were measured for photon energies 1-5 eV (1240-248 nm). The spectra were non-monotonous as their transmission and reflection bands were strongly dependent on the coating architecture. A set of advanced electron spectroscopy methods was used to analyse the electronic structure of the coatings controlling optical properties. Energies of plasmons peaks and the distribution of their intensities are functions of the Ag layers thickness as well as the composition and thickness of the dielectric nanolayers in the MIM nanocomposite. Statistical analysis established the cross-correlations between geometrical parameters of the coatings, transmissions and reflection bands on the optical spectra and parameters of the electronic structure. Particularly, the blue side of the transmittance band is controlled by plasmons while the dielectric band gap determines the transmittance of the red side. The obtained experimental results allowed us to fulfil the computed architectural design of a multilayer Al 2 O 3 /Ag coating with a narrow bandwidth in the visible light region and strong reflection in the infrared and ultraviolet regions.

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“…Compared with other physical sources, light is becoming an attractive external stimulus to propel both nano/micromotors and macromotors owing to its unlimited, nonintrusive, clean, and easily controllable capability. Light‐driven nano/micromotors are promising candidates for biomedical and environmental applications . For example, Baraban and co‐workers.…”

mentioning

confidence: 99%

Bubble‐Enabled Underwater Motion of a Light‐Driven Motor

Luan

Meng

Tao

et al. 2019

Small

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This work reports the photothermally driven horizontal motion of a motor as well as the suspending and vertical movements underwater. A motor is designed by attaching two polydimethylsiloxane‐coated oxidized copper foams (POCF) to the two opposite sides of an oxidized copper foam (OCF). When the hydrophobic POCF is immersed in water, it serves as both an air bubble trapper and a light‐to‐heat conversion center. As bubbles grow under photothermal heating, they provide lifting force and result in the revolving motion of the motor. With removal of light illumination, bubbles are cooled by the surrounding water and shrink, and the buoyance is lowered. The resultant force of gravitational force, buoyance, and fluid resistance drives the motor to move forward horizontally. Furthermore, the motors are utilized as oil collectors and oil/water separation is achieved successfully. To effectively control the suspending motion, a polydimethylsiloxane foam doped with carbon black (C‐foam) is designed under the photothermal principle. It is maintained at a certain position underwater by controlling the on/off of light. The vertical motion is also studied and utilized to generate electricity. It is expected that different types of underwater motion will open up new opportunities for various applications including drug delivery, collection of heavy oil underwater, and electricity generation.

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Fuel‐Free Nanocap‐Like Motors Actuated Under Visible Light

Cited by 57 publications

References 69 publications

Recent Advances in Nano‐ and Micromotors

Recent Advances in Nano‐ and Micromotors

Interconnections between Electronic Structure and Optical Properties of Multilayer Nanolaminate TiAlN/Ag and Al2O3/Ag Coatings

Bubble‐Enabled Underwater Motion of a Light‐Driven Motor

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