Assembly of One-Patch Colloids into Clusters via Emulsion Droplet Evaporation

Hai, Pham Viet; Fortini, Andrea; Schmidt, Matthias

doi:10.3390/ma10040361

Cited by 7 publications

(4 citation statements)

References 39 publications

(62 reference statements)

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“…The parameter Y measures the strength of the Yukawa repulsion and the inverse shielding length κ controls the range of the Yukawa interaction. Models of this type, as illustrated in Figure 1a, have proven useful in studies of the formation of colloidal shells [31] and the clustering of colloidal particles [29,30,32,33]. Emulsion droplets stabilized by colloidal particles, so-called Pickering emulsions, are considered to be highly stable, due to a significant reduction in the surface free energy [34].…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

Two-Dimensional Clusters of Colloidal Particles Induced by Emulsion Droplet Evaporation

et al. 2020

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The minimization principle of the second moment of the mass distribution ( M 2 ) is responsible for the unique structure of three-dimensional clusters by using emulsion droplet evaporation. Herein we study the structure of two-dimensional clusters of colloidal particles bound at the interface of liquid droplets in the plane. We found that, differently from the three-dimensional system, the two-dimensional clusters have multiple degenerate configurations (isomers). An interesting feature of such two-dimensional clusters is that they have the same packings as those belonging to a class of geometric figures known as polyiamonds. In particular, except for the six-particle cluster, many higher order clusters of polyiamond have not been reported previously. Using a simple geometrical approach, based on the number of ways to generate a packing, we calculated the occupation probabilities of distinct isomeric clusters. The level of agreement with the results of metropolis Monte Carlo simulations was good for clusters containing up to nine particles, suggesting that our two-dimensional cluster structures are not a result of the minimization of the second moment. In addition, the structure of these clusters is somewhat insensitive to the range and depth of the interparticle potential, in good agreement with the results in the literature.

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Section: Model and Simulation Methodsmentioning

confidence: 99%

Two-Dimensional Clusters of Colloidal Particles Induced by Emulsion Droplet Evaporation

et al. 2020

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“…The majority of currently fabricated particle capsules (and therefore studied in the context of controllable release) consist of monolayer or multilayer shells, each composed of one type of material. − However, the functionality of microcapsules can be significantly extended if a shell layer is composed of multiple components with different chemical or physical properties. Such patchy capsules, supplemented by functionalities similar to those offered by well-studied patchy particles, − have advantageous properties when compared with their homogenous counterparts. For example, patchy capsules cannot only be propelled, aligned, and oriented in a controlled manner but also may release their cargo in a specific direction .…”

Section: Introductionmentioning

confidence: 99%

Direction-Specific Release from Capsules with Homogeneous or Janus Shells Using an Ultrasound Approach

Kubiak

Banaszak

Józefczak

et al. 2020

ACS Appl. Mater. Interfaces

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A variety of approaches have been developed to release contents from capsules, including techniques that use electric or magnetic fields, light, or ultrasound as a stimulus. However, in the majority of the known approaches, capsules are disintegrated in violent way and the liberation of the encapsulated material is often in a random direction. Thus, the controllable and direction-specific release from microcapsules in a simple and effective way is still a great challenge. This greatly limits the use of microcapsules in applications where targeted and directional release is desirable. Here, we present a convenient ultrasonic method for controllable and unidirectional release of an encapsulated substance. The release is achieved by using MHz-frequency ultrasound that enables the inner liquid stretching, which imposes mechanical stress on the capsule’s shell. This leads to the puncturing of the shell and enables smooth liberation of the liquid payload in one direction. We demonstrate that 1–4.3 MHz acoustic waves with the intensity of a few W/cm2 are capable of puncturing of particle capsules with diameters ranging from around 300 μm to 5 mm and the release of the encapsulated liquid in a controlled manner. Various aspects of our route, including the role of the capsule size, ultrasound wavelength, and intensity in the performance of the method, are studied in detail. We also show that the additional control of the release can be achieved by using capsules having patchy shells. The presented method can be used to facilitate chemical reactions in micro- and nanolitre droplets and various small-scale laboratory operations carried in bulk liquids in microenvironment. Our results may also serve as an entry point for testing other uses of the method and formulation of theoretical modeling of the presented ultrasound mechanism.

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“…All the observed configurations follow the structure of a 2D hexagonal lattice but differ in their degree of compactness. To quantify this parameter, the second moment of area M 2 of each configuration was calculated as follows: , where n denotes the number of beads, r i is the coordinate of the i th bead’s center, and r 0 is the coordinate of the cluster’s centroid (see Supporting Information). In Figures and , as well as later in this letter, M 2 is normalized to the number of beads n and to the squared radius of the beads R 2 for the sake of clarity: As a general rule, our observations show that for a given number of assembled beads, the most compact configuration is also the one with the highest probability of occurrence.…”

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Seven at One Blow: Particle Cluster Stability in a Single Plasmonic Trap on a Silicon Waveguide

Magno

Ecarnot

et al. 2020

ACS Photonics

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Relying on localized surface plasmons, plasmonic nanotweezers enable trapping and handling nanoparticles in the near-field of nanoscale optical hotspots. In this work, we uncover new functionalities offered by plasmonic nanotweezers integrated in hybrid photonic–plasmonic platforms. Using a periodic chain of gold nanorods coupled to a silicon photonic waveguide, we demonstrate the optical trapping of single dielectric nanobeads as well as the formation of well-defined self-assembled nanobead clusters. Based on experimental observations and particle tracking analysis, we measure the trapping efficiency and analyze the statistical trends of the clusters’ topology and stability. We demonstrate that vacancy-free cluster configurations composed of four and seven beads benefit from an enhanced stability thanks to the concomitant actions of both the optical forces and the bead–waveguide electrostatic interactions. This effect could enable further optimization of integrated plasmonic nanotweezers for efficient particle assembly and manipulation at the nanoscale in future lab-on-a-chip applications.

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Assembly of One-Patch Colloids into Clusters via Emulsion Droplet Evaporation

Cited by 7 publications

References 39 publications

Two-Dimensional Clusters of Colloidal Particles Induced by Emulsion Droplet Evaporation

Two-Dimensional Clusters of Colloidal Particles Induced by Emulsion Droplet Evaporation

Direction-Specific Release from Capsules with Homogeneous or Janus Shells Using an Ultrasound Approach

Seven at One Blow: Particle Cluster Stability in a Single Plasmonic Trap on a Silicon Waveguide

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