Generic model for tunable colloidal aggregation in multidirectional fields

Kogler, Florian; Velev, Orlin D.; Hall, Carol K.; Klapp, Sabine H. L.

doi:10.1039/c5sm01103e

Cited by 13 publications

(12 citation statements)

References 61 publications

(205 reference statements)

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“…The overall behavior (including the cluster's fractal dimension and behavior of bond time correlations) is similar to diffusion-limited aggregation. Upon increasing the temperature the clusters "melt" and the system transforms into a fluid phase, consistent with results of a simple mean-field density functional theory [33].…”

Section: Multipolar Particles In Bi-directional Fieldssupporting

confidence: 83%

“…Finally, Fig. 1(f) sketches a particle with crossed, extended dipoles induced by a combination of two external fields [6,33]. Even more complex charge distributions have been suggested in the context of "inverse patchy colloids" [34,35].…”

Section: Modelsmentioning

confidence: 95%

“…Using fields in an orthogonal set-up the particles have been shown to build 2D, percolated networks, whose structure appears to depend on time and whose topological (connectivity) properties can be tuned independently by the two fields [6]. In [33], Brownian Dynamics simulations were carried out on the basis of a simplified, yet generic model suitable for (spherical) particles in crossed fields. The model contains four charges with variable separation δ (see Fig.…”

Section: Multipolar Particles In Bi-directional Fieldsmentioning

confidence: 99%

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Collective dynamics of dipolar and multipolar colloids: From passive to active systems

Klapp

2016

Current Opinion in Colloid & Interface Science

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This article reviews recent research on the collective dynamical behavior of colloids with dipolar or multipolar interactions. Indeed, whereas equilibrium structures and static self-assembly of such systems are now rather well understood, the past years have seen an explosion of interest in understanding dynamicals aspects, from the relaxation dynamics of strongly correlated dipolar networks over systems driven by time-dependent, electric or magnetic fields, to pattern formation and dynamical control of active, self-propelled systems. Unraveling the underlying mechanisms is crucial for a deeper understanding of self-assembly in and out of equilibrium and the use of such particles as functional devices. At the same time, the complex dynamics of dipolar colloids poses challenging physical questions and puts forward their role as model systems for nonlinear behavior in condensed matter physics. Here we attempt to give an overview of these developments, with an emphasis on theoretical and simulation studies. arXiv:1602.00107v1 [cond-mat.soft]

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Section: Multipolar Particles In Bi-directional Fieldssupporting

confidence: 83%

Section: Modelsmentioning

confidence: 95%

Section: Multipolar Particles In Bi-directional Fieldsmentioning

confidence: 99%

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Collective dynamics of dipolar and multipolar colloids: From passive to active systems

Klapp

2016

Current Opinion in Colloid & Interface Science

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“…Examples of models for charged patchy particles include those for evaluating the effect of the charge pattern on protein–protein/solvent interactions 59,71 and the nucleation of protein crystals, 72 as well as those for studying the self-assembly and gelation of both embedded and induced dipolar colloids. 73–75 Notably, recent studies on particles with simple charge patterns, termed inverse patchy colloids, 66,76,77 have illustrated the role of long-range attractions/repulsions on tuning the equilibrium between phases of fluid, solid, and colloidal monolayers. Nonetheless, there remain outstanding questions regarding how the presence of both attractive and repulsive patches will affect the phase behavior of patchy particles in comparison to that of particles with only specific attractions.…”

Section: Introductionmentioning

confidence: 99%

Effect of the surface charge distribution on the fluid phase behavior of charged colloids and proteins

Blanco

Shen

2016

The Journal of Chemical Physics

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A generic but simple model is presented to evaluate the effect of the heterogeneous surface charge distribution of proteins and zwitterionic nanoparticles on their thermodynamic phase behavior. By considering surface charges as continuous “patches”, the rich set of surface patterns that is embedded in proteins and charged patchy particles can readily be described. This model is used to study the fluid phase separation of charged particles where the screening length is of the same order of magnitude as the particle size. In particular, two types of charged particles are studied: dipolar fluids and protein-like fluids. The former represents the simplest case of zwitterionic particles, whose charge distribution can be described by their dipole moment. The latter system corresponds to molecules/particles with complex surface charge arrangements such as those found in biomolecules. The results for both systems suggest a relation between the critical region, the strength of the interparticle interactions, and the arrangement of charged patches, where the critical temperature is strongly correlated to the magnitude of the dipole moment. Additionally, competition between attractive and repulsive charge–charge interactions seems to be related to the formation of fluctuating clusters in the dilute phase of dipolar fluids, as well as to the broadening of the binodal curve in protein-like fluids. Finally, a variety of self-assembled architectures are detected for dipolar fluids upon small changes to the charge distribution, providing the groundwork for studying the self-assembly of charged patchy particles.

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“…8 in the Appendix). 55 However, changing the relative orientation of the two dipoles may result in a complex surface interaction pattern around the particles. The formation of the closed packed clusters in experiments demonstrates that the spatial interaction is more isotropic in the case of electric and magnetic fields mutually inclined at 451 in comparison to 901.…”

Section: Collapse Of Colloidal Network Into 2d Crystalsmentioning

confidence: 99%

Multidirectional colloidal assembly in concurrent electric and magnetic fields

et al. 2016

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a Dipolar interactions between nano-and micron sized colloids lead to their assembly into domains with well-defined local order. The particles with a single dipole induced by an external field assemble into linear chains and clusters. However, to achieve the formation of multidirectionally organized nano-or microassemblies with tunable physical characteristics, more sophisticated interaction tools are needed.Here we demonstrate that such complex interactions can be introduced in the form of two independent, non-interacting dipoles (double-dipoles) within a microparticle. We show how this can be achieved by the simultaneous application of alternating current (AC)-electric field and uniform magnetic field to dispersions of superparamagnetic microspheres. Depending on their timing and intensity, concurrent electric and magnetic fields lead to the formation of bidirectional particle chains, colloidal networks, and discrete crystals. We investigate the mechanistic details of the assembly process, and identify and classify the non-equilibrium states formed. The morphologies of different experimental states are in excellent correlation with our theoretical predictions based on Brownian dynamics simulations combined with a structural analysis based on local energy parameters. This novel methodology of introducing and interpreting double-dipolar particle interactions may assist in the assembly of colloidal coatings, dynamically reconfigurable particle networks, and bidirectional active structures.

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Generic model for tunable colloidal aggregation in multidirectional fields

Cited by 13 publications

References 61 publications

Collective dynamics of dipolar and multipolar colloids: From passive to active systems

Collective dynamics of dipolar and multipolar colloids: From passive to active systems

Effect of the surface charge distribution on the fluid phase behavior of charged colloids and proteins

Multidirectional colloidal assembly in concurrent electric and magnetic fields

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