Colloidal molecules and patchy particles: complementary concepts, synthesis and self-assembly

Li, Weiya; Palis, Hervé; Merindol, Rémi; Majimel, Jérôme; Ravaine, Serge; Duguet, Étienne

doi:10.1039/c9cs00804g

Cited by 140 publications

(143 citation statements)

References 169 publications

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“…It is expected that upon decreasing the number of gold patches, the particles could form into the 3D structures with lower coordination numbers, including body-centered-cubic and diamond lattices. Achieving these exotic self-assembly structures by controlling directional DLVO interactions of patchy particles can be universal, and thus many research interests are focused on experimental efforts to improve the purity of nanoparticles and to precisely control the interaction [94].…”

Section: Dlvo Interactionmentioning

confidence: 99%

“…The total entropy of the system increases as the particles come into contact and cause the overlapped excluded volume to increase and allow the depletants to explore more space [110]. The phenomenon can be interpreted as when depletants are absent in the space between two particles, the lower osmotic pressure of the pure solvent in this volume pushes particles toward each other [94]. Depletion attraction has been successfully exploited to trigger self-assembly of micro-sized concave patchy colloids as "lock-and-key" and non-patchy anisotropic nanoparticles with large flat facets (Figure 7a-d), in the presence of surfactant micelles or non-adsorbing watersoluble polymers [111][112][113][114].…”

Section: Other Interactions Of An Entropic Originmentioning

confidence: 99%

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Patchy Nanoparticle Synthesis and Self-Assembly

Kim¹,

Yao²,

Kalutantirige³

et al. 2020

Self-Assembly of Nanostructures and Patchy Nanoparticles

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Biological building blocks (i.e., proteins) are encoded with the information of target structure into the chemical and morphological patches, guiding their assembly into the levels of functional structures that are crucial for living organisms. Learning from nature, researchers have been attracted to the artificial analogues, “patchy particles,” which have controlled geometries of patches that serve as directional bonding sites. However, unlike the abundant studies of micron-scale patchy particles, which demonstrated complex assembly structures and unique behaviors attributed to the patches, research on patchy nanoparticles (NPs) has remained challenging. In the present chapter, we discuss the recent understandings on patchy NP design and synthesis strategies, and physical principles of their assembly behaviors, which are the main factors to program patchy NP self-assembly into target structures that cannot be achieved by conventional non-patched NPs. We further summarize the self-assembly of patchy NPs under external fields, in simulation, and in kinetically controlled assembly pathways, to show the structural richness patchy NPs bring. The patchy NP assembly is novel by their structures as well as the multicomponent features, and thus exhibits unique optical, chemical, and mechanical properties, potentially aiding applications in catalysts, photonic crystals, and metamaterials as well as fundamental nanoscience.

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Section: Dlvo Interactionmentioning

confidence: 99%

Section: Other Interactions Of An Entropic Originmentioning

confidence: 99%

Patchy Nanoparticle Synthesis and Self-Assembly

Kim¹,

Yao²,

Kalutantirige³

et al. 2020

Self-Assembly of Nanostructures and Patchy Nanoparticles

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“…Their synthesis depends on a finely controlled heteroaggregation process. Their assembly give smart supraparticles [14] [15] [16], which may be of great interest for new materials such as metamaterials [17], colloidal crystals [18], or complex nanomachines [19]. Another field of application is the stabilization of emulsions by heteroaggregates [20] [21], which could replace efficiently the use of traditional organic surfactants, which are not healthy nor environmental-friendly.…”

Section: Introductionmentioning

confidence: 99%

An experimental and simulation study of heteroaggregation in a binary mixture of alumina and silica colloids

Aimable

Delomenie

Cerbelaud

et al. 2020

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Heteroaggregation corresponds to an attraction between two different types of particles. It can either lead to stable or instable systems, depending on the conditions. In this paper heteroaggregation in binary mixtures of alumina and silica colloids (size ratio = 8.5) is studied, by coupling an experimental approach and Brownian dynamics simulations. Two main objectives are targeted. The first one is to bridge the gap between coagulation and dispersion, by examining the effect of the relative concentrations of silica and alumina. The second one is to study the effect of the volume fraction of solid, which impacts strongly the aggregation mechanism. The coagulation or the dispersion are evidenced by sedimentation tests, granulometry, and rheological measurements, supported by zeta potential measurements. Heteroaggregates could be observed by transmission electron microscopy. Brownian dynamics simulations give more insight into the very first moments of the process, to predict the adsorption kinetic and the heteroaggregates structure. A very good agreement is obtained between experiments and simulations, which both show adsorption of silica leads to the bridging of alumina particles and thus coagulation at low concentration. This adsorption is rapidly limited by electrostatic interactions, then hindering alumina agglomeration by repulsive interactions. For the higher solid fractions, alumina aggregation is more likely, as two alumina particles can easier encounter before their surface is enough covered by the silica to avoid their aggregation.

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“…Inspired by the precise self-assembly of protein complexes, virial capsids, and other molecular systems, it is becoming increasingly possible to drive the monodisperse self-assembly of specific colloidal structures by either altering the shape of the colloids or by introducing highly selective interactions. Prominent examples of synthetic building blocks include: Janus and patchy particles [8][9][10][11], lock and key colloids [12][13][14], and DNA decorated colloids [15][16][17][18][19]. This approach has been particularly fruitful, and a variety of colloidal materials with promising mechanical and optical properties have been synthesised in this manner over the past decade.…”

Section: Introductionmentioning

confidence: 99%

Universal reshaping of arrested colloidal gels via active doping

Mallory

Bowers

Cacciuto

2020

The Journal of Chemical Physics

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Colloids that interact via a short-range attraction serve as the primary building blocks for a broad range of self-assembled materials. However, one of the well-known drawbacks to this strategy is that these building blocks rapidly and readily condense into a metastable colloidal gel. Using computer simulations, we illustrate how the addition of a small fraction of purely repulsive self-propelled colloids, a technique referred to as active doping, can prevent the formation of this metastable gel state and drive the system toward its thermodynamically favored crystalline target structure. The simplicity and robust nature of this strategy offers a systematic and generic pathway to improving the self-assembly of a large number of complex colloidal structures. We discuss in detail the process by which this feat is accomplished and provide quantitative metrics for exploiting it to modulate self-assembly. We provide evidence for the generic nature of this approach by demonstrating that it remains robust under a number of different anisotropic short-ranged pair interactions in both two and three dimensions. In addition, we report on a novel microphase in mixtures of passive and active colloids. For a broad range of self-propelling velocities, it is possible to stabilize a suspension of fairly monodisperse finite-size crystallites. Surprisingly, this microphase is also insensitive to the underlying pair interaction between building blocks. The active stabilization of these moderatelysized monodisperse clusters is quite remarkable and should be of great utility in the design of hierarchical self-assembly strategies. This work further bolsters the notion that active forces can play a pivotal role in directing colloidal self-assembly.

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Colloidal molecules and patchy particles: complementary concepts, synthesis and self-assembly

Abstract: About the latest developments regarding self-assembly of textured colloids and its prospects.

Cited by 140 publications

References 169 publications

Patchy Nanoparticle Synthesis and Self-Assembly

Patchy Nanoparticle Synthesis and Self-Assembly

An experimental and simulation study of heteroaggregation in a binary mixture of alumina and silica colloids

Universal reshaping of arrested colloidal gels via active doping

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