Catalytic Microstrider at the Air–Liquid Interface

Solovev, Alexander A.; Mei, Yongfeng; Schmidt, Oliver G.

doi:10.1002/adma.201001468

Cited by 63 publications

(56 citation statements)

References 18 publications

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“…A rapid disassembly of CBMs is taking place upon an addition of hydrogen peroxide to PC (Video S4, Supporting Information), Figure f (H 2 O 2 : c 1 = 3.5% v/v, c 2 = 7% v/v, c 3 = 10.5% v/v). Previously, a similar dynamic behavior was observed for bubble‐propelled meniscus‐climbing bubble‐propelled microtubes …”

supporting

confidence: 74%

“…Previously, a similar dynamic behavior was observed for bubble-propelled meniscus-climbing bubblepropelled microtubes. [34] In our approach, stable compound microbubbles based on the air-in-oil-in-water (A/O/W) emulsions are generated using microfluidic techniques, followed by Ti/Pt catalyst e-beam deposition. Gas-cored micromotors form static bubble rafts at the air-solvent interface, while an addition of aqueous hydrogen peroxide fuel leads to a disassembly of bubble rafts and micromotors' self-propelled motion.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 99%

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Nanoparticle‐Shelled Catalytic Bubble Micromotor

Adams

Lee

Mei

et al. 2020

Adv Materials Inter

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Nanoparticle‐shelled bubbles, prepared with glass capillary microfluidics, are functionalized to produce catalytic micromotors that exhibit novel assembly and disassembly behaviors. Stable microbubble rafts are assembled at an air–solvent interface of nonaqueous propylene carbonate (PC) solvent by creating a meniscus using a glass capillary. Upon the addition of hydrogen peroxide fuel, catalytic microbubbles quickly break free from the bubble raft by repelling from each other and self‐propelling at the air–fuel interface (a mixture of PC and aqueous hydrogen peroxide). While most of micromotors generate oxygen bubbles on the outer catalytic shell, some micromotors contain cracks and eject bubbles from the hollow shells containing air. Nanoparticle‐shelled bubbles with a high buoyancy force are particularly attractive for studying novel propulsion modes and interactions between catalytic bubble micromotors at air–fuel interfaces.

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supporting

confidence: 74%

Section: Wwwadvmatinterfacesdementioning

confidence: 99%

Nanoparticle‐Shelled Catalytic Bubble Micromotor

Adams

Lee

Mei

et al. 2020

Adv Materials Inter

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“…Then phorbol 12-myristate 13-acetate activated neutrophils were seeded into aH BSS soaked cell culture substrate before being placed into the center of ap etri dish filled with Dox and PtNP loaded stomatocytes.Atanobservation time of 1.5 h, the nanomotors were found to be translating towards the activated neutrophils.A sac ontrol, we placed only HBSS soaked substrate into the nanomotor-filled petri dish. No such phenomenon was observed in this case.A st he substrate was immersed in the HBSS solution for 30 min and was kept inside the solution during the experiment, no capillary forces [19] between the substrate and air were expected to cause any directional motion of the nanomotors.Furthermore alack of directional motion was also observed when activated neutrophils were placed into asolution of Dox-only loaded stomatocytes.After normalizing the starting point of anumber of stomatocytes to zero,the trajectories of particles over fine consecutive frames (total time interval = 1.34 s) from three groups could be compared. Theo nly group with active neutrophils and nanomotors showed directional movement (Figure 4d).…”

Section: Methodsmentioning

confidence: 99%

Self‐Guided Supramolecular Cargo‐Loaded Nanomotors with Chemotactic Behavior towards Cells

Peng¹,

Tu²,

Hest³

et al. 2015

Angewandte Chemie

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Delivery vehicles that are able to actively seek and precisely locate targeted tissues using concentration gradients of signaling molecules have hardly been explored. The directed movement toward specific cell types of cargo-loaded polymeric nanomotors along ahydrogen peroxideconcentration gradient (chemotaxis) is reported. Through self-assembly,bowl-shaped poly(ethylene glycol)-b-polystyrene nanomotors,o rs tomatocytes,w ere formed with platinum nanoparticles entrapped in the cavity while am odel drug was encapsulated in the inner compartment. Directional movement of the stomatocytes in the presence of afuel gradient (chemotaxis) was first demonstrated in both static and dynamic systems using glass channelsa nd am icrofluidic flow.T he highly efficient response of these motors was subsequently shown by their directional and autonomous movement towards hydrogen peroxides ecreting neutrophil cells.

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“…reported the swarming of gold microparticles triggered by the addition of hydrazine, and the reversible swarming and separation of chemically powered Pt‐Au nanowire nanomotors under acoustic fields . Schmidt and Sanchez described that chemically powered tubular microengines can organize into more complex entities . These recent examples indicate common mesoscopic to large‐scale phenomena, including swarming, out of equilibrium disorder–order transitions, and pattern formations.…”

Section: Figurementioning

confidence: 96%

Light‐Activated Active Colloid Ribbons

Lin

et al. 2017

Angew Chem Int Ed

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We report a dynamic self-organization of self-propelled peanut-shaped hematite motors from non-equilibrium driving forces where the propulsion can be triggered by blue light. They result in one-dimensional, active colloid ribbons with a positive phototactic characteristic. The motion of colloid motors is ascribed to the diffusion-osmotic flow in a chemical gradient by the photocatalytic decomposition of hydrogen peroxide fuel. We show that self-propelled peanut-shaped colloids readily form one-dimensional, slithering ribbon structures under the out-of-equilibrium collisions. This self-organization intrinsically results from the competition among the osmotically driven motion, the phoretic attraction and the inherent magnetic moments. The giant size number fluctuation in colloid ribbons is observed above a critical point 4.1 % of the surface density of colloid motors. Such phototactic colloid ribbons may provide a model system to understand the emergence of function in biological systems and have potential to construct bioinspired active materials based on different active building blocks.

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Catalytic Microstrider at the Air–Liquid Interface

Cited by 63 publications

References 18 publications

Nanoparticle‐Shelled Catalytic Bubble Micromotor

Nanoparticle‐Shelled Catalytic Bubble Micromotor

Self‐Guided Supramolecular Cargo‐Loaded Nanomotors with Chemotactic Behavior towards Cells

Light‐Activated Active Colloid Ribbons

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