Synergistic chemomechanical dynamics of feedback-controlled microreactors

Milster, Sebastian; Darwish, Abeer; Göth, Nils; Dzubiella, Joachim

doi:10.1103/physreve.108.l042601

Cited by 3 publications

(1 citation statement)

References 67 publications

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“…[44][45][46] Here, much more intricate transient dynamics and responses, including regimes of mono-and bistability, excitability, damped oscillations, as well as sustained oscillatory states can be expected during the time evolution. 8,47…”

Section: Discussionmentioning

confidence: 99%

Mean-field models for the chemical fueling of transient soft matter states

Pattloch,

Dzubiella

2023

Soft Matter

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Section: Discussionmentioning

confidence: 99%

Mean-field models for the chemical fueling of transient soft matter states

Pattloch,

Dzubiella

2023

Soft Matter

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Reversible Electron-Beam Patterning of Colloidal Nanoparticles at Fluid Interfaces

Raybin,

Dunsworth,

Guo

et al. 2024

ACS Appl. Mater. Interfaces

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The directed self-assembly of colloidal nanoparticles (NPs) using external fields guides the formation of sophisticated hierarchical materials but becomes less effective with decreasing particle size. As an alternative, electron-beam-driven assembly offers a potential avenue for targeted nanoscale manipulation, yet remains poorly controlled due to the variety and complexity of beam interaction mechanisms. Here, we investigate the beam−particle interaction of silica NPs pinned to the fluid−vacuum interface of ionic liquid droplets. In these experiments, scanning electron microscopy of the droplet surface resolves NP trajectories over space and time while simultaneously driving their reorganization. With this platform, we demonstrate the ability to direct particle transport and create transient, reversible colloidal patterns on the droplet surface. By tuning the beam voltage, we achieve precise control over both the strength and sign of the beam−particle interaction, with low voltages repelling particles and high voltages attracting them. This response stems from the formation of well-defined solvent flow fields generated from trace radiolysis of the ionic liquid, as determined through statistical analysis of single-particle trajectories under varying solvent composition. Altogether, electron-beam-guided assembly introduces a versatile strategy for nanoscale colloidal manipulation, offering new possibilities for the design of dynamic, reconfigurable systems with applications in adaptive photonics and catalysis.

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Tracer dynamics in polymer networks: Generalized Langevin description

Milster,

Koch,

Widder

et al. 2024

The Journal of Chemical Physics

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Tracer diffusion in polymer networks and hydrogels is relevant in biology and technology, while it also constitutes an interesting model process for the dynamics of molecules in fluctuating, heterogeneous soft matter. Here, we systematically study the time-dependent dynamics and (non-Markovian) memory effects of tracers in polymer networks based on (Markovian) implicit-solvent Langevin simulations. In particular, we consider spherical tracer solutes at high dilution in regular, tetrafunctional bead-spring polymer networks and control the tracer–network Lennard-Jones (LJ) interactions and the polymer density. Based on the analysis of the memory (friction) kernels, we recover the expected long-time transport coefficients and demonstrate how the short-time tracer dynamics, polymer fluctuations, and the viscoelastic response are interlinked. Furthermore, we fit the characteristic memory modes of the tracers with damped harmonic oscillations and identify LJ contributions, bond vibrations, and slow network relaxations. Tuned by the LJ interaction parameter, these modes enter the kernel with an approximately linear to quadratic scaling, which we incorporate into a reduced functional form for convenient tracer memory interpolation and extrapolation. This eventually leads to highly efficient simulations utilizing the generalized Langevin equation, in which the polymer network acts as an additional thermal bath with a tunable intensity.

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Synergistic chemomechanical dynamics of feedback-controlled microreactors

Cited by 3 publications

References 67 publications

Mean-field models for the chemical fueling of transient soft matter states

Mean-field models for the chemical fueling of transient soft matter states

Reversible Electron-Beam Patterning of Colloidal Nanoparticles at Fluid Interfaces

Tracer dynamics in polymer networks: Generalized Langevin description

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