Kinetically Controlled Self-Assembly of Latex–Microgel Core–Satellite Particles

Tagliazucchi, Mario; Zou, Fengwei; Weiss, Emily A.

doi:10.1021/jz5013609

Cited by 17 publications

(20 citation statements)

References 45 publications

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“…the effective potential describes the whole dynamics of the system as it approaches its NESS. We start by writing down the Fokker-Planck equation for the system, 42 ( , )ˆ( , ) p t Lp t t ∂ = ∂ r r (9) where p(r, t) is the probability density at time t, i.e. the probability to find the system at r (where r is the vector of the positions of all particles in the system) at time t. The Fokker-Planck operator L is defined as:…”

Section: Analytical Analysis Of the Dynamical Evolution Of Particles mentioning

confidence: 99%

Dynamics of dissipative self-assembly of particles interacting through oscillatory forces

Tagliazucchi

Szleifer

2016

Faraday Discuss.

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Dissipative self-assembly is the formation of ordered structures far from equilibrium, which continuously uptake energy and dissipate it into the environment. Due to its dynamical nature, dissipative self-assembly can lead to new phenomena and possibilities of self-organization that are unavailable to equilibrium systems. Understanding the dynamics of dissipative self-assembly is required in order to direct the assembly to structures of interest. In the present work, Brownian dynamics simulations and analytical theory were used to study the dynamics of self-assembly of a mixture of particles coated with weak acids and bases under continuous oscillations of the pH. The pH of the system modulates the charge of the particles and, therefore, the interparticle forces oscillate in time. This system produces a variety of self-assembled structures, including colloidal molecules, fibers and different types of crystalline lattices. The most important conclusions of our study are: (i) in the limit of fast oscillations, the whole dynamics (and not only those at the non-equilibrium steady state) of a system of particles interacting through time-oscillating interparticle forces can be described by an effective potential that is the time average of the time-dependent potential over one oscillation period; (ii) the oscillation period is critical to determine the order of the system. In some cases the order is favored by very fast oscillations while in others small oscillation frequencies increase the order. In the latter case, it is shown that slow oscillations remove kinetic traps and, thus, allow the system to evolve towards the most stable non-equilibrium steady state.

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Section: Analytical Analysis Of the Dynamical Evolution Of Particles mentioning

confidence: 99%

Dynamics of dissipative self-assembly of particles interacting through oscillatory forces

Tagliazucchi

Szleifer

2016

Faraday Discuss.

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“…Heteroaggregation was frequently studied to test theories on the interactions between oppositely charged particles [43] and/or the fractal nature of the resulting 3D gels and aggregates [40,44]. However, as mentioned, it is only recently that groups have started to explore heteroaggregation as a way to arrive at regular clusters of a small number of oppositely charged building blocks [7,27,29,45].…”

Section: Introductionmentioning

confidence: 99%

Long-Ranged Oppositely Charged Interactions for Designing New Types of Colloidal Clusters

et al. 2015

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Getting control over the valency of colloids is not trivial and has been a long-desired goal for the colloidal domain. Typically, tuning the preferred number of neighbors for colloidal particles requires directional bonding, as in the case of patchy particles, which is difficult to realize experimentally. Here, we demonstrate a general method for creating the colloidal analogs of molecules and other new regular colloidal clusters without using patchiness or complex bonding schemes (e.g., DNA coating) by using a combination of long-ranged attractive and repulsive interactions between oppositely charged particles that also enable regular clusters of particles not all in close contact. We show that, due to the interplay between their attractions and repulsions, oppositely charged particles dispersed in an intermediate dielectric constant (4 < ε < 10) provide a viable approach for the formation of binary colloidal clusters. Tuning the size ratio and interactions of the particles enables control of the type and shape of the resulting regular colloidal clusters. Finally, we present an example of clusters made up of negatively charged large and positively charged small satellite particles, for which the electrostatic properties and interactions can be changed with an electric field. It appears that for sufficiently strong fields the satellite particles can move over the surface of the host particles and polarize the clusters. For even stronger fields, the satellite particles can be completely pulled off, reversing the net charge on the cluster. With computer simulations, we investigate how charged particles distribute on an oppositely charged sphere to minimize their energy and compare the results with the solutions to the well-known Thomson problem. We also use the simulations to explore the dependence of such clusters on Debye screening length κ −1 and the ratio of charges on the particles, showing good agreement with experimental observations.

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“…For example, Janus polymer microgels were synthesized by surface‐masking technique or surfactant‐free Pickering emulsion‐based modification . Satellite‐like microgels with multi‐site surface modification were prepared by electrostatic assembly between oppositely charged microgel and latex . Based on the above advantages of microgels, an idealized microgel model was constructed.…”

Section: Methodsmentioning

confidence: 99%

Directed Self‐Assembly of Patchy Microgels into Anisotropic Nanostructures

Wang

Zhang

et al. 2019

Macromol. Rapid Commun.

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recent years, some DSA strategies have been developed. [4] The building blocks were organized into ordered structures indirectly using templates (e.g., DNA, [5] capillary, [6] topographically patterned substrates [7,8] ) or external fields (e.g., electric [9] and magnetic fields, [10] flow field [11] ). Besides, a rich interplay of multiple chemically distinct components and geometrical complexity of assembly units could be directly tailored to achieve the DSA behavior. Obviously, the latter is a simple and robust "bottom-up" way.The DSA process can be controlled precisely by the intrinsic characteristics of nanoparticles, like imparting directionality in molecular interactions and controlling particle geometry. Recent attention in particle design and synthesis has focused on the "patches" onto the particle surface to effectively regulate the interaction directionality. Soft patchy assemblies with different symmetries from triblock terpolymers could be further co-assembled into substructured and compartmentalized materials with predictable and tunable nanoscale periodicities. [12] Triblock Janus colloidal spheres with two hydrophobic poles and an electrically charged middle band were induced to form a complex predetermined colloidal crystal-kagome structure via the hydrophobic attraction and electrostatic repulsion. [13] By utilizing the anion-π interaction as the driving force, long-distance self-assembly with coherent particle formation was achieved, on which the cavity orientation of the bismacrocycle components had a significant influence. [14] On the basis of "patch" strategy, the geometry of nanoscale building blocks also plays key roles in the hierarchical assembly of ordered superstructures, especially for anisotropic nanoparticles with nonspherical shapes. [15] Patchy ellipsoidal polymer particles with sticky interactions near the tips were produced by the thermo/mechanical stretching and following wet chemical treatment. [16] The patchy, inverse pom-pom ellipsoids could interact directionally and self-assemble into chains or denser structures in bulk. Snowman-type Janus nanoparticles (JNPs) were used as a model to study the effect of colloidal geometries on their assembled superstructures. [17] Both finite (capsules with different curvatures) and nonfinite superstructures (free-standing single-layered or double-layered JNPs sheets) Multi-geometry nanostructures with high-order, complex, and controllable geometries have attracted extensive attention in the development of functional nanomaterials. A simple and versatile strategy is proposed to construct various anisotropic nanostructures through the directed self-assembly (DSA) of patchy microgels. A general criterion for interaction parameters is developed by the variance analysis method to achieve the formation of 1Dnanorods by the single directional DSA process, and 2D or 3D polymorphs including V/T/h/cross shapes, multiple arms, multi-directional bending, single/multiple rings, nanocages, etc., by the multi-directional DSA process of binary microgel b...

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Kinetically Controlled Self-Assembly of Latex–Microgel Core–Satellite Particles

Cited by 17 publications

References 45 publications

Dynamics of dissipative self-assembly of particles interacting through oscillatory forces

Dynamics of dissipative self-assembly of particles interacting through oscillatory forces

Long-Ranged Oppositely Charged Interactions for Designing New Types of Colloidal Clusters

Directed Self‐Assembly of Patchy Microgels into Anisotropic Nanostructures

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