Catalytic Motors—Quo Vadimus?

Dey, Krishna Kanti; Wong, Flory; Altemose, Alicia; Sen, Ayusman

doi:10.1016/j.cocis.2015.12.001

Cited by 72 publications

(64 citation statements)

References 79 publications

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“…Active colloids offer intriguing prospects for materials-based applications,g iven their ability to achieve autonomous motion in fluids and selfassemble in response to their environment. [36][37][38] Most of these systems only exhibit as ingle type of collective behavior, and only afew examples have been reported in which sequential or oscillatory transitions between two different patterns are observed. [10][11][12][13] Synthetic nano-and micromotors that function through the conversion of chemical energy into mechanical motion [14][15][16] have been the subject of growing interest.…”

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confidence: 99%

Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies

et al. 2017

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We report an autonomous oscillatory micromotor system in which active colloidal particles form clusters, the size of which changes periodically. The system consists of an aqueous suspension of silver orthophosphate microparticles under UV illumination, in the presence of varying concentrations of hydrogen peroxide. The colloid particles first attract each other to form clusters. After a short delay, these clusters abruptly disperse and oscillation begins, alternating between clustering and dispersion of particles. After a cluster oscillation initiates, the oscillatory wave propagates to nearby clusters and eventually all the clusters oscillate in phase-shifted synchrony. The oscillatory behavior is governed by an electrolytic self-diffusiophoretic mechanism which involves alternating electric fields generated by the competing reduction and oxidation of silver. The oscillation frequency is tuned by changing the concentration of hydrogen peroxide. The addition of inert silica particles to the system results in hierarchical sorting and packing of clusters. Densely packed Ag PO particles form a non-oscillating core with an oscillating shell composed largely of silica microparticles.

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confidence: 99%

Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies

et al. 2017

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“…More general survey articles about the physics of active colloidal systems are found in [5,25]. Articles on the fabrication of active colloids, the involved chemical processes, or their control and technical applications exist [26][27][28][29][30][31][32][33][34][35][36][37][38]. Non-equilibrium and thermodynamic properties, as well as motility-induced phase separation and active clustering, are discussed in [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Emergent behavior in active colloids

Zöttl

Stark

2016

J. Phys.: Condens. Matter

511

559

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Active colloids are microscopic particles, which self-propel through viscous fluids by converting energy extracted from their environment into directed motion. We first explain how articial microswimmers move forward by generating near-surface flow fields via self-phoresis or the self-induced Marangoni effect. We then discuss generic features of the dynamics of single active colloids in bulk and in confinement, as well as in the presence of gravity, field gradients, and fluid flow. In the third part, we review the emergent collective behavior of active colloidal suspensions focussing on their structural and dynamic properties. After summarizing experimental observations, we give an overview on the progress in modeling collectively moving active colloids. While active Brownian particles are heavily used to study collective dynamics on large scales, more advanced methods are necessary to explore the importance of hydrodynamic and phoretic particle interactions. Finally, the relevant physical approaches to quantify the emergent collective behavior are presented.

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“…Traditionally, the active matter system can be divided into many different categories: living cells [10], microtubule system consisting of actin and myosin [11], undomesticated bacterial system [12], self-oscillated polymer gels [13], synthetic Janus particles [14][15][16][17] such as Au-Pt rods and many other types [18][19][20][21][22] (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Collective motion of bacteria and their dynamic assembly behavior

Feng

2017

Sci. China Mater.

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In recent years, active matter systems have attracted considerable attentions due to their complex dynamic behaviors in physical and material science. In particular, microorganism systems have served as model systems for observing dynamic assembly and collective motility of active particles and significant progresses have been made on in-depth understanding of how high density bacteria colony behaves in the non-equilibrium state. In this mini-review, we mainly focus on the collective motion of bacteria and their dynamic assembly from four aspects: (1) the general phenomenon and biological mechanism of bacterial collective motion; (2) the common experimental techniques for studying bacterial motility; (3) some active systems on exploring bacterial collective behavior, which include both non-restricted free suspensions and those in relative confined geometric space; (4) the phenomenological and descriptive statistical methods and physical models on the underlying laws that lead to large-scale coordinate patterns in multicellular systems. This review aims to give a general picture of the collective motion in bacterial active matter systems experimentally and theoretically in order to reflect the interplays between individuals among populations in motion. It is expected that the general regulation rules related to the boundary effects in the complex systems and materials can be elucidated to some extent.

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Catalytic Motors—Quo Vadimus?

Cited by 72 publications

References 79 publications

Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies

Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies

Emergent behavior in active colloids

Collective motion of bacteria and their dynamic assembly behavior

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