Selective encapsulation by Janus particles

Li, Wei; Ruth, Donovan; Gunton, J. D.; Rickman, J. M.

doi:10.1063/1.4922781

Cited by 11 publications

(7 citation statements)

References 42 publications

(72 reference statements)

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“…Very recently, we have proposed heteronuclear dimers as encapsulating agents for spherical particles [33]. Aside from its fundamental interest, the reversible formation of capsules [34,35] around a dissolved target species ("guest") is an issue of growing importance in the pharmaceutical field, where it finds application in drug delivery [36][37][38], and for food industry as well, as a tool to improve the delivery of bioactive substances into foods [39,40].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly in a model colloidal mixture of dimers and spherical particles

Prestipino

Munaò

Costa

et al. 2017

The Journal of Chemical Physics

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We investigate the structure of a dilute mixture of amphiphilic dimers and spherical particles, a model relevant to the problem of encapsulating globular "guest" molecules in a dispersion. Dimers and spheres are taken to be hard particles, with an additional attraction between spheres and the smaller monomers in a dimer. Using Monte Carlo simulation, we document the low-temperature formation of aggregates of guests (clusters) held together by dimers, whose typical size and shape depend on the guest concentration χ. For low χ (less than 10%), most guests are isolated and coated with a layer of dimers. As χ progressively increases, clusters grow in size becoming more and more elongated and polydisperse; after reaching a shallow maximum for χ ≈ 50%, the size of clusters again reduces upon increasing χ further. In one case only (χ = 50% and moderately low temperature) the mixture relaxed to a fluid of lamellae, suggesting that in this case clusters are metastable with respect to crystal-vapor separation. On heating, clusters shrink until eventually the system becomes homogeneous on all scales. On the other hand, as the mixture is made denser and denser at low temperature, clusters get increasingly larger until a percolating network is formed.

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Section: Introductionmentioning

confidence: 99%

Self-assembly in a model colloidal mixture of dimers and spherical particles

Prestipino

Munaò

Costa

et al. 2017

The Journal of Chemical Physics

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“…Although much activity so far has focused on two-faced JPs, theoretical studies have also concerned multiblock colloidal spherical particles and particles of different shapes. , Self-assembly of JPs in various environments has been studied, including different solvents, mixtures with isotropic particles, − interfaces, and magnetic or electric fields …”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Amphiphilic Janus Particles Confined between Two Solid Surfaces

2020

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We use Monte Carlo simulations to investigate the behavior of Janus spheres confined between two parallel surfaces. Janus particles are composed of attractive and repulsive parts. The slits with identical and competing walls are considered. In the studied systems, we have found (i) the two-dimensional crystallization of clusters, (ii) the surface-induced formation of “levitating” slabs, and (iii) “inverted” adsorption in Janus-like pores. The mechanism of the formation of particular structures is discussed in detail. Bond orientation analysis is used to identify crystalline phases. We have analyzed the impact of selected parameters on the morphology of the considered systems.

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“…Finite clusters can serve, for instance, as prototypes of micro-robots to perform tasks at the micro-scale such as delivery and targeting. Recent and successful examples of anisotropic patchy particles assembling into finite clusters are colloidal asymmetric dumbbells that show a rotational propulsion under electric field [15], dielectric cubes with one metallic facet that reconfigure on demand [16], or Janus spheroids that act as encapsulating agents [17].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical self-assembly of patchy colloidal platelets

2020

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Anisotropy at the level of the inter-particle interaction provides the particles with specific instructions for the self-assembly of target structures. The ability to synthesize non-spherical colloids, together with the possibility of controlling the particle bonding pattern via suitably placed interaction sites, is nowadays enlarging the playfield for materials design. We consider a model of anisotropic colloidal platelets with regular rhombic shape and two attractive sites placed along adjacent edges and we run Monte Carlo simulations in two-dimensions to investigate the two-stage assembly of these units into clusters with well-defined symmetries and, subsequently, into extended lattices. Our focus is on how the site positioning and site-site attraction strength can be tuned to obtain micellar aggregates that are robust enough to successively undergo to a second-stage assembly from sparse clusters into a stable hexagonal lattice. arXiv:2001.00373v1 [cond-mat.soft]

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Selective encapsulation by Janus particles

Cited by 11 publications

References 42 publications

Self-assembly in a model colloidal mixture of dimers and spherical particles

Self-assembly in a model colloidal mixture of dimers and spherical particles

Self-Assembly of Amphiphilic Janus Particles Confined between Two Solid Surfaces

Hierarchical self-assembly of patchy colloidal platelets

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