Ionic Effects in Ionic Diffusiophoresis in Chemically Driven Active Colloids

Zhou, Xuemao; Wang, Shuo; Xian, Longbin; Shah, Zameer Hussain; Li, Yurou; Lin, Guanhua; Gao, Yongxiang

doi:10.1103/physrevlett.127.168001

Cited by 40 publications

(45 citation statements)

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“…μ < 0 ( μ > 0) corresponds to the colloid moving toward a high (low) chemical concentration. Experimentally, these two parameters can be manipulated by modifying the surface chemistry of the colloidal particles ( Lyu et al, 2021 ; Zhou et al, 2021 ).…”

Section: Methodsmentioning

confidence: 99%

“…In this work, we numerically investigated the collective behavior of binary active/passive colloids systems in which colloidal particles interact and respond via diffusiophoresis. Here the active colloids present the catalytic active colloids, such as Pt and hematite ( Howse et al, 2007 ; Zhou et al, 2021 ), which will decompose the chemicals, for example, H 2 O 2 in the solution, while the passive colloids will not decompose the chemicals, but they will respond to the chemical gradient, such as TPM particles ( Zhou et al, 2021 ). By altering the surface parameters, size ratio, and area fractions of each component, we demonstrate that the binary mixtures can self-organize into structures, such as the yolk/shell, binary active/passive alloy, dynamical clusters, and moving clusters.…”

Section: Introductionmentioning

confidence: 99%

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Self Organization of Binary Colloidal Mixtures via Diffusiophoresis

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Catalytic activity of the colloids and chemotactic response to gradients of the chemicals in the solution leads to effective interaction between catalytic colloids. In this paper, we simulate mixtures of active and passive colloids via a Brownian dynamics algorithm. These particles interact via phoretic interactions, which are determined by two independent parameters, surface activity and surface mobility. We find rich dynamic structures by tuning passive colloids’ surface mobility, size, and area fractions, which include schools of active colloids with exclusion zone, yolk/shell cluster, and stable active–passive alloys to motile clusters. Dynamical cluster can also be formed due to the nonreciprocity of the phoretic interaction. Increasing the size ratio of passive colloids to active colloids favors the phase separation of active and passive colloids, resulting in yolk/shell structure. Increasing the area fraction of active colloids tends to transfer from dynamical clusters into stable alloys. The simulated binary active colloid systems exhibit intriguing nonequilibrium phenomena that mimic the dynamic organizations of active/passive systems.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self Organization of Binary Colloidal Mixtures via Diffusiophoresis

et al. 2022

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“…Polymeric organic, silica, or organo-silica particles are mostly used as tracers with inorganic semiconductors. [9,13,14,22] We demonstrate the prototypical pumping activity under different lights in a fuel-free condition as the overall band structure of as-synthesized colloids (diameter ≈1. which creates an exclusion zone around the active particles (Figure 4a).…”

Section: Fuel-free Polymeric Colloidal Micropumpsmentioning

confidence: 94%

“…Typically, prehydrolyzed 3-trimethoxysilyl propyl methacrylate (hTPM) was prepared by the addition of TPM oil (1mL) into DI water (10 mL) through vigorous stirring at room temperature for 1 h. [22,50] Afterward, DI water (13.3 mL) and ammonia solution (3.5 µL) were first added in a glass vial (30 mL) followed by the addition of hTPM (0.7 mL). This mixture was gently mixed with handshaking and left undisturbed for 0.4 h. Afterward, the as-prepared colloidal mixture was photo-polymerized with HCPK (50 mg) under UV illumination (365 nm, 5.6 mW cm −2 ) for 20 min with Spectroline XX-15A benchtop UV lamp.…”

Section: Synthesis Of 3-trimethoxysilyl Propyl Methacrylate Colloidsmentioning

confidence: 99%

“…Second, these micromachines require a high concentration of toxic hydrogen peroxide (H 2 O 2 ) as the fuel to function. [4,19,[22][23][24] Most importantly, the rigid inorganic composition limits their chemical modularity, and additional posttreatments are often needed to overhaul their photophysical properties. [19] Recently, metal-free active organic systems such as graphitic carbon nitride microtubes (micromotor, bubble propulsion, and H 2 O 2 ) and extended π-conjugated donoracceptor photocatalysts have been reported.…”

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Inorganic–Organic Hybrid Copolymeric Colloids as Multicolor Emission, Fuel‐Free, UV‐ and Visible‐Light‐Actuated Micropumps

Basharat

Shah

Ikram

et al. 2022

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Light‐actuated micromachines are of enormous interest due to their ability to harvest light for triggering catalytic reactions to acquire free energy for mechanical work. This work presents an inorganic–organic hybrid copolymeric poly(cyclotriphosphazene‐co‐barbituric acid) colloid, which displays multiwavelength excited emission and catalytic activities, exploiting the unique structural, chemical, and optical features of inorganic heterocyclic ring hexachlorocyclotriphosphazene and organic co‐monomer barbituric acid. Specifically, this work reveals particle‐resolved unusual multicolor emission under excitation with the same or different wavelengths of light using fluorescence microscopy. The result is rationalized by density functional theory studies. In this work, the authors find that emission is coincident with fluorometric measurements, and the photocatalytic properties are anticipated from the overall band structure. This work also demonstrates the use of these colloids as micropumps, which can be remotely activated by UV, blue, and green lights under fuel‐free conditions, and ascribe the behavior to ionic diffusiophoresis arising from light‐triggered generation of H+ and other charged species. This work offers a new class of polymeric colloids with multiple‐wavelength excited emission and catalytic activities, which is expected to open new opportunities in the design of fuel‐free, photo‐actuated micromachines and active systems.

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Micromotors with Spontaneous Multipattern Motion and Microvortex for Enhanced “On‐the‐Fly” Molecule Enrichment

Lin,

Xiong,

et al. 2023

Advanced Intelligent Systems

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“On‐the‐fly” molecule enrichment by micro/nanomotors obviously improves heterogeneous catalysis, trace detection, and environmental monitoring, yet faces challenges of the trade‐off between collection range and interaction time. Inspired by the versatile foraging process of predators, this work demonstrates that micromotors doing spontaneous multipattern motion with microvortex can greatly enhance “on‐the‐fly” enrichment, demonstrated by highly sensitive surface‐enhanced Raman scattering detection. It leverages an axis‐asymmetric bowl‐shaped structure and the nonlinear Ag–AgCl reaction, realizing alternating low‐velocity swinging forward and accelerated steering motions for prolonged interaction and large work area. Moreover, the bowl‐shaped microstructure bestows a micro‐vortex above the Ag side due to the competition of electric potential and pressure gradient, also extending interaction time during the acceleration. Consequently, it exhibits at least an order of magnitude larger enhancement of detection signals than the counterparts. This proof‐of‐concept study highlights the significance of motion mode and structure design in guiding flow field, offering substantial benefits for applications.

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Ionic Effects in Ionic Diffusiophoresis in Chemically Driven Active Colloids

Cited by 40 publications

References 50 publications

Self Organization of Binary Colloidal Mixtures via Diffusiophoresis

Self Organization of Binary Colloidal Mixtures via Diffusiophoresis

Inorganic–Organic Hybrid Copolymeric Colloids as Multicolor Emission, Fuel‐Free, UV‐ and Visible‐Light‐Actuated Micropumps

Micromotors with Spontaneous Multipattern Motion and Microvortex for Enhanced “On‐the‐Fly” Molecule Enrichment

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