Influence of PEG on the clustering of active Janus colloids

Kalil, Mohammed A.; Baumgartner, Nicky R.; Issa, Marola W.; Ryan, Shawn D.; Wirth, Christopher L.

doi:10.1016/j.colsurfa.2021.127191

Cited by 4 publications

(5 citation statements)

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“…Imaging processing has been used to track the quantity of clusters from each population to evaluate whether living crystals have been formed or growth of a cluster continues in an unbounded fashion. In our previous work, 10 we tracked cluster formation by measuring the number of objects of a given population (doublets, triplets, etc..) in the entire ensemble. This measurement provided the fraction of a given population or % Observed.…”

Section: Mechanism and Analysis Framework For Propulsionmentioning

confidence: 99%

“…Further, interactions with nearby boundaries and between neighboring particles strongly influence dynamics. Our group further explored this phenomenon by probing the influence of PEG on the collective behavior of catalytic active Janus particles . We measured the effect of PEG on this clustering behavior in catalytic active particle systems at intermediate particle concentration.…”

Section: Control Via Nonspecific Interactionsmentioning

confidence: 99%

Section: Control Via Nonspecific Interactionsmentioning

confidence: 99%

“…Micrometer scale Janus colloids are chemically anisotropic particles that have garnered broad interest over the past two decades. − “Active” Janus colloids generate a mechanical force in response to environmental cues, which can be either locally or externally applied. − These systems undergo deterministic motion because of a break in symmetry, enabled by the patchy chemical morphology . The synergism between environmental cues and the local break in symmetry actuates motion. ,, Environmental cues that induce a mechanical force include light, chemical reactions, acoustic, magnetic, electric fields, and even enzymatic driven reactions. − Ensembles of active Janus particles display a wide variety of intriguing individual (i.e., near interfaces) and collective (i.e., near neighboring particles) dynamics in response to local crowding. − These complex dynamics will often influence local assembly and bulk fluid properties . Further, these phenomena allow active Janus particles to serve as analogs for microorganisms (i.e., multiflagellar bacteria), controlled cargo microscale transport, and biosensing. − …”

Section: Introductionmentioning

confidence: 99%

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Engineered Polypeptides as a Tool for Controlling Catalytic Active Janus Particles

Issa

Calderon

Kamlet

et al. 2023

ACS Appl. Eng. Mater.

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Active Janus colloids are functional particles that combine two distinct chemical or physical surface properties. The anisotropic nature of this class of patchy particles allows them to harvest and redirect energy to create a local force that leads to autonomous motion. Modulating the surface forces experienced by or the responsiveness of a Janus particle's surface offer an avenue of further control. There are broad efforts in the community to advance the fundamental understanding of and engineer such control into active systems. This article aims to summarize recent work in catalytic active Janus colloids, peptide and polypeptide engineering and design, and present work showing how engineered polypeptides can be used to control motion of catalytic active particles. Experiments probing nonspecific effects are reviewed that measured the active motion of 5 μm catalytic Janus spheres in the presence of low molecular weight polyethylene glycol (PEG). Previous work has found that at infinitely dilute concentrations of particles, the addition of PEG in solution reduced particle propulsion speed. Further increasing particle concentration led to increased clustering at low concentrations of PEG, but clustering was then reduced at high concentrations of PEG. These results inspired work presented herein with 3 μm particles that shows platinum binding peptides that specifically attach to the platinum cap reduced the propulsion speed. These data support a pathway for using engineered peptides as tools for controlling the activity of catalytic active Janus particles. Overall, this article highlights how nonspecific and specific molecular interactions can achieve control in active systems.

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Section: Mechanism and Analysis Framework For Propulsionmentioning

confidence: 99%

Section: Control Via Nonspecific Interactionsmentioning

confidence: 99%

Section: Control Via Nonspecific Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Engineered Polypeptides as a Tool for Controlling Catalytic Active Janus Particles

Issa

Calderon

Kamlet

et al. 2023

ACS Appl. Eng. Mater.

Self Cite

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“…Also, experiments on diffusiophoretically propelled Si/Pt Janus particles in dilute polyvinylpyrrolidone solutions, as well as in semi-dilute and entangled polyacrylamide solutions, have shown that active motion in the polymer networks is restricted, leading to changes in motor translational diffusion. [36] Studies of the influence of polyethylene glycol on the clustering dynamics of active Janus colloids have shown that as its concentration increases clustering initially increases and then decreases; the mitigation of clustering at higher concentrations is attributed to suppressed propulsion [37].…”

mentioning

confidence: 99%

Self-propelled motors in complex fluids and as constituents of active materials

Thakur

Qiao

Kapral

2022

EPL

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Simulation has played an important part in studies of active matter systems, and this paper considers some aspects of the use of stochastic models for the behavior of active particles in complex media and in applications to active functional materials. The scope of the work is primarily focused on small active particles whose activity is derived from chemical reactions and diffusiophoretic mechanisms that operate in the presence of fluctuations. Both Langevin and particle-based models are considered, and their relative merits are discussed.

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