Dynamic interfaces for contact-time control of colloidal interactions

Xu, Yongjian; Choi, Kyu Hwan; G., Nagella, Sachit; Takatori, Sho C.

doi:10.1039/d3sm00673e

Cited by 3 publications

(2 citation statements)

References 66 publications

(77 reference statements)

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“…9,12,13 Relaxation of surface-species out of equilibrium can occur on timescales that are relevant to bulk colloidal transport. 67,68 Further study into colloidal transport mechanisms in "dynamic" porous materials may enable controlled design of tracer particles (e.g., drug) by tuning timescales of dynamic interactions between obstacles (fluid-mediated hydrodynamics) and surfacespecies (direct particle interaction) that govern long-time diffusion.…”

Section: Discussionmentioning

confidence: 99%

Colloidal transport phenomena in dynamic, pulsating porous materials

Nagella,

Takatori

2023

AIChE Journal

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We study the transport phenomena of colloidal particles embedded within a moving array of obstacles that mimics a dynamic, time‐varying porous material. While colloidal transport in an array of stationary obstacles (“passive” porous media) has been well studied, we lack the fundamental understanding of colloidal diffusion in a nonequilibrium porous environment. We combine Taylor dispersion theory, Brownian dynamics simulations, and optical tweezer experiments to study the transport of tracer colloidal particles in an oscillating lattice of obstacles. We discover that the dispersion of tracer particles is a nonmonotonic function of oscillation frequency and exhibits a maximum that exceeds the Stokes–Einstein–Sutherland diffusivity in the absence of obstacles. By solving the Smoluchowski equation using a generalized dispersion framework, we demonstrate that the enhanced transport of the tracers depends critically on both the direct interparticle interactions with the obstacles and the fluid‐mediated, hydrodynamic interactions generated by the moving obstacles.

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Section: Discussionmentioning

confidence: 99%

Colloidal transport phenomena in dynamic, pulsating porous materials

Nagella,

Takatori

2023

AIChE Journal

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“…29 As a separate example, Xu and Choi et al recently demonstrated that polymer-coated colloids exhibit dynamic pairwise forces which slowly relax over time when colloids are driven towards each other at speeds comparable to polymer surface diffusion. 30 While such nonequilibrium effects are important in dictating the macroscopic behavior of driven suspensions, developing models for out-of-equilibrium particle interactions remains a challenge. Previous work has primarily focused on bath particle organization around fixed colloids, while colloids in a free suspension are able to undergo motion under various forces such as Brownian diffusion and advection.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium interactions between multi-scale colloids regulate the suspension microstructure and rheology

Xu,

Takatori

2023

Soft Matter

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Dynamic surfactants drive anisotropic colloidal assembly

Xu,

Jandhyala,

Takatori

2024

The Journal of Chemical Physics

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Colloidal building blocks with re-configurable shapes and dynamic interactions can exhibit unusual self-assembly behaviors and pathways. In this work, we consider the phase behavior of colloids coated with surface-mobile polymer brushes that behave as “dynamic surfactants.” Unlike traditional polymer-grafted colloids, we show that colloids coated with dynamic surfactants can acquire anisotropic macroscopic assemblies, even for spherical colloids with isotropic attractive interactions. We use Brownian Dynamics simulations and dynamic density functional theory to demonstrate that time-dependent reorganization of the dynamic surfactants leads to phase diagrams with anisotropic assemblies. We observed that the microscopic polymer distributions impose unique geometric constraints between colloids that control their packing into lamellar, string, and vesicle phases. Our work may help discover versatile building blocks and provide extensive design freedom for assembly out of thermodynamic equilibrium.

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Dynamic interfaces for contact-time control of colloidal interactions

Abstract: Understanding pairwise interactions between colloidal particles out of equilibrium has a profound impact on dynamical processes such as colloidal self assembly. However, traditional colloidal interactions are effectively quasi-static on colloidal...

Cited by 3 publications

References 66 publications

Colloidal transport phenomena in dynamic, pulsating porous materials

Colloidal transport phenomena in dynamic, pulsating porous materials

Nonequilibrium interactions between multi-scale colloids regulate the suspension microstructure and rheology

Dynamic surfactants drive anisotropic colloidal assembly

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