Investigating Time‐Dependent Active Motion of Janus Micromotors using Dynamic Light Scattering

McGlasson, Alex; Bradley, Laura C.

doi:10.1002/smll.202104926

Cited by 9 publications

(9 citation statements)

References 69 publications

(111 reference statements)

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“…The results reported here provide an inroad modeling framework for hydrodynamics of active colloids 2,13,57,58 . The present study also helps us understand the rheology of JP oligomers that may be realized in the experiments.…”

Section: Discussionmentioning

confidence: 93%

Effects of Tunable Hydrophobicity on the Collective Hydrodynamics of Janus Particles under Flows

Fu¹,

Ryham²,

Quaife³

et al. 2022

Preprint

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Active colloidal systems with non-equilibrium self-organization is a long-standing, challenging area in biology. To understand how hydrodynamic flow may be used to actively control self-assembly of Janus particles (JPs), we use a model recently developed for the many-body hydrodynamics of amphiphilic JPs suspended in a viscous background flow (JFM, 941, 2022). We investigate how various morphologies arise from tuning the hydrophobic distribution of the JP-solvent interface. We find JPs assembled into uni-lamella, multi-lamella and striated structures. To introduce dynamics, we include a linear shear flow and a steady Taylor-Green mixing flow, and measure the collective dynamics of JP particles in terms of their (a) free energy from the hydrophobic interactions between the JPs, (b) order parameter for the ordering of JPs in terms of alignment of their directors, and (c) strain parameter that captures the deformation in the assembly.We characterize the effective material properties of the JP structures and find that the uni-lamellar structures increases orientation order under shear flow, the multilamellar structure behaves as a shear thinning fluid, and the striated structure possesses a yield stress. These numerical results provide insights into dynamic control of non-equilibrium active biological systems with similar self-organization.

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Section: Discussionmentioning

confidence: 93%

Effects of Tunable Hydrophobicity on the Collective Hydrodynamics of Janus Particles under Flows

Fu¹,

Ryham²,

Quaife³

et al. 2022

Preprint

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“…Reproduced with permission. [96] Copyright 2021, Wiley-VCH GmbH. microscope (500×) set with a depression angle of 25°for the side view to simultaneously achieve a 3D motion observation (Figure 11c).…”

Section: Current 3d Motion Observation and Tracking Techniquementioning

confidence: 99%

“…Similar to the widely used tracking system in nanomotors, McGlasson and Bradley employed the dynamic light scattering (DLS) system as an alternative characterization method to investigate 3D micromotor motion in bulk dispersions (Figure 11f). [96] The field of motion tracking and analysis, particularly in the vertical direction, has not received much attention, and there are limited systematic studies on this topic. [93a, 94,96] Therefore, there is a need for further research to enrich the motion tracking and analysis system, with an emphasis on the vertical direction.…”

Section: Current 3d Motion Observation and Tracking Techniquementioning

confidence: 99%

3D Motion Manipulation for Micro‐ and Nanomachines: Progress and Future Directions

Huang,

Yang,

Ying

et al. 2023

Advanced Materials

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In the past decade, micro‐ and nanomachines (MNMs) have made outstanding achievements in the fields of targeted drug delivery, tumor therapy, microsurgery, biological detection, and environmental monitoring and remediation. Researchers have made significant efforts to accelerate the rapid development of MNMs capable of moving through fluids by means of different energy sources (chemical reactions, ultrasound, light, electricity, magnetism, heat, or their combinations). However, the motion of MNMs is primarily investigated in confined two‐dimensional (2D) horizontal setups. Furthermore, three‐dimensional (3D) motion control remains challenging, especially for vertical movement and control, significantly limiting its potential applications in cargo transportation, environmental remediation, and biotherapy. Hence, an urgent need is to develop MNMs that can overcome self‐gravity and controllably move in 3D spaces. This review will delve into the latest progress made in MNMs with 3D motion capabilities under different manipulation approaches, discuss the underlying motion mechanisms, explore potential design concepts inspired by nature for controllable 3D motion in MNMs, and present the available 3D observation and tracking systems.This article is protected by copyright. All rights reserved

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“…Catalytic active particles are typically visualized with a light microscope in a fluid cell, but there is one other excellent example in which light scattering was used to track activity. 120 Previously published and new experiments described in this article were conducted with light microscopy. Polystyrene beads with nominally 3 μm diameter were obtained from Fisher Scientific (Lot #2307860).…”

Section: Fabrication Of Janus Particles and Assembly Of Experimental ...mentioning

confidence: 99%

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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Investigating Time‐Dependent Active Motion of Janus Micromotors using Dynamic Light Scattering

Cited by 9 publications

References 69 publications

Effects of Tunable Hydrophobicity on the Collective Hydrodynamics of Janus Particles under Flows

Effects of Tunable Hydrophobicity on the Collective Hydrodynamics of Janus Particles under Flows

3D Motion Manipulation for Micro‐ and Nanomachines: Progress and Future Directions

Engineered Polypeptides as a Tool for Controlling Catalytic Active Janus Particles

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