Catalytic Janus Motors on Microfluidic Chip: Deterministic Motion for Targeted Cargo Delivery

Baraban, Larysa; Makarov, Denys; Streubel, Robert; Mönch, Ingolf; Grimm, Daniel; Sánchez, Samuel; Schmidt, Oliver G.

doi:10.1021/nn300413p

Cited by 367 publications

(394 citation statements)

References 61 publications

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“…The production rate, which corresponds to the distribution of the reactivity of the catalyst on an actual microswimmer, is assumed to be axisymmetric in the z-axis. This is a reasonable reduction for particles created using vapour deposition [51,52]. Thus, in spherical polar coordinates the production rate can be described by a function…”

Section: Discussion and Outlookmentioning

confidence: 99%

The efficiency of self-phoretic propulsion mechanisms with surface reaction heterogeneity

Kreissl

Holm

Graaf

2016

The Journal of Chemical Physics

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We consider the efficiency of self-phoretic colloidal particles (swimmers) as a function of the heterogeneity in the surface reaction rate. The set of fluid, species, and electrostatic continuity equations is solved analytically using a linearization and numerically using a finite-element method. To compare spherical swimmers of different size and with heterogeneous catalytic conversion rates, a 'swimmer efficiency' functional η is introduced. It is proven, that in order to obtain maximum swimmer efficiency the reactivity has to be localized at the pole(s). Our results also shed light on the sensitivity of the propulsion speed to details of the surface reactivity, a property that is notoriously hard to measure. This insight can be utilized in the design of new self-phoretic swimmers.

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Section: Discussion and Outlookmentioning

confidence: 99%

The efficiency of self-phoretic propulsion mechanisms with surface reaction heterogeneity

Kreissl

Holm

Graaf

2016

The Journal of Chemical Physics

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“…Relation (6) says that the same swimmer following essentially similar strokes may be a pusher or a puller depending on the precise parameter values of the forces it faces. For instance, the nature of the swimmer can be changed by simply applying the driving at a different rate ( Fig.…”

Section: Effect Of Driving Parameters On the Velocity And Nature Of Smentioning

confidence: 99%

Forces and shapes as determinants of micro-swimming: effect on synchronisation and the utilisation of drag

Pande

Smith

2015

Soft Matter

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“…Different techniques haven been developed to achieve cargo pickup, such as electrostatic attraction (51), specific or nonspecific binding (51)(52)(53)(54)(55)(56), magnetic interactions (57,58), hydrodynamic interactions (59), hydrophobic affinity (31), molecular imprinting (60), and even purely mechanical force (46,61). Most of these cargo transport systems require the cargo and/or the cargo carrier to be functionalized in some way (31,51,(53)(54)(55)(56)60).…”

Section: Significancementioning

confidence: 99%

Catalytically powered dynamic assembly of rod-shaped nanomotors and passive tracer particles

Wang

Duan

Sen

et al. 2013

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

173

169

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Nano-and microscale motors powered by catalytic reactions exhibit collective behavior such as swarming, predator-prey interactions, and chemotaxis that resemble those of biological microorganisms. A quantitative understanding of the catalytically generated forces between particles that lead to these behaviors has so far been lacking. Observations and numerical simulations of pairwise interactions between gold-platinum nanorods in hydrogen peroxide solutions show that attractive and repulsive interactions arise from the catalytically generated electric field. Electrokinetic effects drive the assembly of staggered doublets and triplets of nanorods that are moving in the same direction. None of these behaviors are observed with nanorods composed of a single metal. The motors also collect tracer microparticles at their head or tail, depending on the charge of the particles, actively assembling them into close-packed rafts and aggregates of rafts. These motor-tracer particle interactions can also be understood in terms of the catalytically generated electric field around the ends of the nanorod motors.dynamic interactions | self-assembly | colloidal transport T he dynamic interactions between moving objects, in particular their response to external stimuli and their communication with each other, govern their collective behavior on many length scales. Schooling of fish and flocking of birds are good examples of emergent phenomena that are orchestrated by communication between individuals in a large group. In these systems, macroscale organization is typically driven by nearest neighbor interactions that follow simple rules. To reach the level of organization seen in such living assemblies, fast and precise (in terms of distances, angles, and velocities) communication and control are required from the members. It is now straightforward to create computational models from which such dynamic structures emerge, but artificial systems that mimic behaviors as complicated as fish schooling have very rarely been realized experimentally in macroscopic engineered systems (1). On the other hand, self-assembly at the nano-and molecular levels already demonstrates a certain level of complexity and has furthered our understanding of dynamic interactions at small scales (2, 3).There are already many examples of particle assembly driven by local forces or externally applied fields. Externally applied light, magnetic, electric, and acoustic fields can drive symmetric particles into ordered arrays (4-7). Colloidal Janus particles selfassemble into complex structures by various mechanisms (8-12). However, in these examples the particle aggregates hardly approach the complexity of assemblies of living organisms; the interactions are passive responses to local forces and external fields with very limited interparticle communication or active response to the behavior of nearest neighbors.Interactions between active particles, on the other hand, can more closely mimic those of living organisms (13-17). Powered particles generate signals, t...

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Catalytic Janus Motors on Microfluidic Chip: Deterministic Motion for Targeted Cargo Delivery

Cited by 367 publications

References 61 publications

The efficiency of self-phoretic propulsion mechanisms with surface reaction heterogeneity

The efficiency of self-phoretic propulsion mechanisms with surface reaction heterogeneity

Forces and shapes as determinants of micro-swimming: effect on synchronisation and the utilisation of drag

Catalytically powered dynamic assembly of rod-shaped nanomotors and passive tracer particles

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