Encapsulation by Janus spheroids

Li, Wei; Liu, Ya; Brett, Genevieve; Gunton, J. D.

doi:10.1039/c2sm00005a

Cited by 19 publications

(18 citation statements)

References 32 publications

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“…In this study, we utilize the same model for the encapsulation system as proposed in the earlier work. 32 In the system, the encapsulating agents are Janus spheroids and the encapsulated guests are isotropic spheres (as shown in Figs. 1(a) and 1(b)).…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

“…This is particularly true for an aspect ratio equal to 0.6. 32 In this article, we continue our study of this new proposed encapsulation system and further investigate the associated thermodynamics of self-assembly. The phase diagram of this blended system remains unknown, and our main focus is on the encapsulation properties.…”

Section: Introductionmentioning

confidence: 91%

“…[23][24][25][26][27][28][29][30][31] Moreover, the micelle and vesicle structures formed by different Janus particles have been studied. 24,[26][27][28][29][30] In a previous report, 32 we proposed a new encapsulation system, consisting of Janus oblate spheroids and isotropic spheres, in which the spheroids act as the encapsulating agents and the spheres as encapsulated guests. As in the case of self-assembling lipids and block copolymers described above, the ability to form shells by self-assembly makes the Janus spheroid a good candidate for an encapsulating agent.…”

Section: Introductionmentioning

confidence: 99%

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Selective encapsulation by Janus particles

Ruth

Gunton

et al. 2015

The Journal of Chemical Physics

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We employ Monte Carlo simulation to examine encapsulation in a system comprising Janus oblate spheroids and isotropic spheres. More specifically, the impact of variations in temperature, particle size, inter-particle interaction range, and strength is examined for a system in which the spheroids act as the encapsulating agents and the spheres as the encapsulated guests. In this picture, particle interactions are described by a quasi-square-well patch model. This study highlights the environmental adaptation and selectivity of the encapsulation system to changes in temperature and guest particle size, respectively. Moreover, we identify an important range in parameter space where encapsulation is favored, as summarized by an encapsulation map. Finally, we discuss the generalization of our results to systems having a wide range of particle geometries.

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Section: Model and Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Selective encapsulation by Janus particles

Ruth

Gunton

et al. 2015

The Journal of Chemical Physics

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“…The experimental fabrication of such particles is of research interest in itself [48,58,59], as is the theoretical understanding of the interactions between spherical [60,61] or between non-spherical Janus particles [62,63], because they are considered to be promising building-blocks for selfassembling materials.…”

Section: Dashed Lines) the Center Of The Colloid Is Located At (A Anmentioning

confidence: 99%

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

et al. 2014

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Recent experiments have demonstrated a fluctuation-induced lateral trapping of spherical colloidal particles immersed in a binary liquid mixture near its critical demixing point and exposed to chemically patterned substrates. Inspired by these experiments, we study this kind of effective interaction, known as the critical Casimir effect, for elongated colloids of cylindrical shape. This adds orientational degrees of freedom. When the colloidal particles are close to a chemically structured substrate, a critical Casimir torque acting on the colloids emerges. We calculate this torque on the basis of the Derjaguin approximation. The range of validity of the latter is assessed via mean-field theory. This assessment shows that the Derjaguin approximation is reliable in experimentally relevant regimes, so that we extend it to Janus particles endowed with opposing adsorption preferences. Our analysis indicates that critical Casimir interactions are capable of achieving well-defined, reversible alignments both of chemically homogeneous and of Janus cylinders.

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“…The systematical study about the dependence of shape and surface interaction of Janus particle is necessary. [39][40][41][42] However, their model is only suitable for Monte Carlo simulation because of the inconsecutive potential and the accurate dynamics of the system is unavailable. In experiments, Janus ellipsoids have been successfully synthesized and the self-assemblies of Janus ellipsoids with different shapes were studied in the past.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of Janus ellipsoids: a Brownian dynamics simulation with a quantitative nonspherical-particle model

Wang

2015

Soft Matter

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Janus ellipsoids as mesoscale building blocks can aggregate into various micelle-like structures in solution that have potential applications in many fields such as novel surfactants, photonic crystals, drug delivery and biochemical sensors. In this work, we present a novel nonspherical-particle model to investigate the self-assembly of Janus ellipsoids, which quantitatively reflects interaction dependence on the particle shape. The phase diagrams of Janus ellipsoids depending on the aspect ratio and the component ratio are achieved and various aggregates are observed such as a sandwich-type structure, columnar aggregates, vesicles, liquid crystals, random aggregation structures, spherical micelles and wormlike micelles. The specific heat capacity curves and temperature evolutions illustrate the formation processes of assembled superstructures detailedly. We analyze the potential energy surfaces (PESs) of interaction between two Janus ellipsoids and the minimum energy paths (MEPs) between saddle points on the PESs. It is found that the number of metastable conformation and the activation energy along MEPs rely not only on the ellipsoidal shape but also on the component ratio. This work provides rich and valuable information for a deep understanding of the self-assembly mechanism of Janus ellipsoids and design of new mesoscale building blocks.

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Encapsulation by Janus spheroids

Cited by 19 publications

References 32 publications

Selective encapsulation by Janus particles

Selective encapsulation by Janus particles

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Self-assembly of Janus ellipsoids: a Brownian dynamics simulation with a quantitative nonspherical-particle model

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