Self-Assembly of Micromachining Systems Powered by Janus Micromotors

Maggi, Claudio; Simmchen, Juliane; Saglimbeni, Filippo; Katuri, Jaideep; Dipalo, Michele; Angelis, Francesco De; Sánchez, Samuel; Leonardo, R. Di

doi:10.1002/smll.201502391

Cited by 125 publications

(136 citation statements)

References 42 publications

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“…Furthermore,the design of such an active system can be subtle,inhope of utilizing the activity or energy input to guide the kinetic aspect of the assembly system. Our work with careful choice of the hub particle size and particle activity demonstrated this possibility,a nd even ac ontrolled bifurcation with simple tuning of experimental parameters.Another example is arecent work [13] in which the authors intentionally choose the size ratio of ap assive gear and active particles to guide the anchoring of active particles to the gear for the deterministic assembly of amicromachine device.U nderstanding and exploiting the new possibilities brought by the activity or autonomy of building blocks could open anew perspective and lead to more desired functionality in the field of directed self-assembly. À1 electric field, comparingdifferent Janus particle orientations (q)o nthe x-axis.…”

Section: Angewandte Chemiementioning

confidence: 99%

Directed Self‐Assembly Pathways of Active Colloidal Clusters

2016

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Despite the mounting interest in synthetic active particles,t oo little is knowna bout their assembly into higherorder clusters.H ere,m ixing bare silica particles with Janus particles that are self-propelled in electric fields,w ea ssemble rotating chiral clusters of various sorts,t heir structures consisting of active particles wrapped around central "hub" particles.T hese clusters self-assemble from the competition between standarde nergetic interactions and the need to be stable as the clusters rotate when the energy source is turned on, and fall apart when the energy input is off.T his allows one to guide the formation of intended clusters,a st he final structure depends notably on the sequence of steps in whichthe clusters form.

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Section: Angewandte Chemiementioning

confidence: 99%

Directed Self‐Assembly Pathways of Active Colloidal Clusters

2016

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Section: Spherical Phoretic Microswimmersmentioning

confidence: 99%

Designing Micro- and Nanoswimmers for Specific Applications

et al. 2016

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ConspectusSelf-propelled colloids have emerged as a new class of active matter over the past decade. These are micrometer sized colloidal objects that transduce free energy from their surroundings and convert it to directed motion. The self-propelled colloids are in many ways, the synthetic analogues of biological self-propelled units such as algae or bacteria. Although they are propelled by very different mechanisms, biological swimmers are typically powered by flagellar motion and synthetic swimmers are driven by local chemical reactions, they share a number of common features with respect to swimming behavior. They exhibit run-and-tumble like behavior, are responsive to environmental stimuli, and can even chemically interact with nearby swimmers. An understanding of self-propelled colloids could help us in understanding the complex behaviors that emerge in populations of natural microswimmers. Self-propelled colloids also offer some advantages over natural microswimmers, since the surface properties, propulsion mechanisms, and particle geometry can all be easily modified to meet specific needs.From a more practical perspective, a number of applications, ranging from environmental remediation to targeted drug delivery, have been envisioned for these systems. These applications rely on the basic functionalities of self-propelled colloids: directional motion, sensing of the local environment, and the ability to respond to external signals. Owing to the vastly different nature of each of these applications, it becomes necessary to optimize the design choices in these colloids. There has been a significant effort to develop a range of synthetic self-propelled colloids to meet the specific conditions required for different processes. Tubular self-propelled colloids, for example, are ideal for decontamination processes, owing to their bubble propulsion mechanism, which enhances mixing in systems, but are incompatible with biological systems due to the toxic propulsion fuel and the generation of oxygen bubbles. Spherical swimmers serve as model systems to understand the fundamental aspects of the propulsion mechanism, collective behavior, response to external stimuli, etc. They are also typically the choice of shape at the nanoscale due to their ease of fabrication. More recently biohybrid swimmers have also been developed which attempt to retain the advantages of synthetic colloids while deriving their propulsion from biological swimmers such as sperm and bacteria, offering the means for biocompatible swimming. In this Account, we will summarize our effort and those of other groups, in the design and development of self-propelled colloids of different structural properties and powered by different propulsion mechanisms. We will also briefly address the applications that have been proposed and, to some extent, demonstrated for these swimmer designs.

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“…Such systems commonly referred to as "active matter", are able to convert energy from the environment into directed persistent motion either by metabolic processes, as in the case of bacteria and spermatozoa, or by chemical reactions as in the case of synthetic Janus particles [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Pressure in an exactly solvable model of active fluid

Marconi

Maggi

Paoluzzi

2017

The Journal of Chemical Physics

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We consider the pressure in the steady-state regime of three stochastic models characterized by self-propulsion and persistent motion and widely employed to describe the behavior of active particles, namely the Active Brownian particle (ABP) model, the Gaussian colored noise (GCN) model and the unified colored noise model (UCNA). Whereas in the limit of short but finite persistence time the pressure in the UCNA model can be obtained by different methods which have an analog in equilibrium systems, in the remaining two models only the virial route is, in general, possible. According to this method, notwithstanding each model obeys its own specific microscopic law of evolution, the pressure displays a certain universal behavior. For generic interparticle and confining potentials we derive a formula which establishes a correspondence between the GCN and the UCNA pressures. In order to provide explicit formulas and examples, we specialize the discussion to the case of an assembly of elastic dumbbells confined to a parabolic well. By employing the UCNA we find that, for this model, the pressure determined by the thermodynamic method coincides with the pressures obtained by the virial and mechanical methods. The three methods when applied to the GCN give a pressure identical to that obtained via the UCNA. Finally, we find that the ABP virial pressure exactly agrees with the UCNA and GCN result.

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Self-Assembly of Micromachining Systems Powered by Janus Micromotors

Cited by 125 publications

References 42 publications

Directed Self‐Assembly Pathways of Active Colloidal Clusters

Directed Self‐Assembly Pathways of Active Colloidal Clusters

Designing Micro- and Nanoswimmers for Specific Applications

Pressure in an exactly solvable model of active fluid

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