Two-dimensional systems with competing interactions: dynamic properties of single particles and of clusters

Schwanzer, Dieter F; Coslovich, Daniele; Kahl, Gerhard

doi:10.1088/0953-8984/28/41/414015

Cited by 14 publications

(17 citation statements)

References 40 publications

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“…Indeed we are only aware of a few studies in which fluids with competing interactions confined between parallel plates were studied, but those were restricted to two-and one-dimensional cases [20,28,29]. The literature on the dynamic behaviour of fluids with competing interactions in confinement is also scarce [30].…”

Section: Introductionmentioning

confidence: 99%

Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores

Serna

Góźdź

Noya

2021

IJMS

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Systems with short-range attractive and long-range repulsive interactions can form periodic modulated phases at low temperatures, such as cluster-crystal, hexagonal, lamellar and bicontinuous gyroid phases. These periodic microphases should be stable regardless of the physical origin of the interactions. However, they have not yet been experimentally observed in colloidal systems, where, in principle, the interactions can be tuned by modifying the colloidal solution. Our goal is to investigate whether the formation of some of these periodic microphases can be promoted by confinement in narrow slit pores. By performing simulations of a simple model with competing interactions, we find that both the cluster-crystal and lamellar phases can be stable up to higher temperatures than in the bulk system, whereas the hexagonal phase is destabilised at temperatures somewhat lower than in bulk. Besides, we observed that the internal ordering of the lamellar phase can be modified by changing the pore width. Interestingly, for sufficiently wide pores to host three lamellae, there is a range of temperatures for which the two lamellae close to the walls are internally ordered, whereas the one at the centre of the pore remains internally disordered. We also find that particle diffusion under confinement exhibits a complex dependence with the pore width and with the density, obtaining larger and smaller values of the diffusion coefficient than in the corresponding bulk system.

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Section: Introductionmentioning

confidence: 99%

Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores

Serna

Góźdź

Noya

2021

IJMS

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“…In certain models, this feature has been identified with the onset of clustering, whose trend it generally follows. 14,[82][83][84] In order to assess this relationship, we separately consider the clustering properties of Eq. ( 1) as detailed in Sec.…”

Section: Discussionmentioning

confidence: 99%

Solution of Disordered Microphases in the Bethe approximation

Charbonneau,

Tarzia

2021

Preprint

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The periodic microphases that self-assemble in systems with competing short-range attractive and long-range repulsive interactions are structurally both rich and elegant. Significant theoretical and computational efforts have thus been dedicated to untangling their properties. By contrast, disordered microphases, which are structurally just as rich but nowhere near as elegant, have not been as carefully considered. Part of the difficulty is that simple mean-field descriptions make a homogeneity assumption that washes away all of their structural features. Here, we study disordered microphases by exactly solving a SALR model on the Bethe lattice. By sidestepping the homogenization assumption, this treatment recapitulates many of the key structural regimes of disordered microphases, including particle and void cluster fluids as well as gelation. This analysis also provides physical insight into the relationship between various structural and thermal observables, between criticality and physical percolation, as well as between glassiness and microphase ordering.

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“…The generated self-assembled structures have applications in medicine, self-driven molecules, catalysis, photonic crystals, stable emulsions, biomolecules and self-healing materials [24]. Experiments [25] and simulations [26,27] showed that in the case of spherical colloids the mechanism behind the formation of these distinct patterns is the presence of competitive interactions. These com-peting forces can appear from the combination of a short range attraction of the core and a long-range repulsion [28] of the grafted polymers [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Waterlike anomalies in hard core–soft shell nanoparticles using an effective potential approach: Pinned vs adsorbed polymers

Marques

Nogueira

Dillenburg

et al. 2020

Journal of Applied Physics

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In this work, a two dimensional system of polymer grafted nanoparticles is analyzed using largescale Langevin Dymanics simulations. Effective core-softened potentials were obtained for two cases: one where the polymers are free to rotate around the nanoparticle core and a second where the polymers are fixed, with a 45 • angle between them. The use of effective core-softened potentials allow us to explore the complete system phase space. In this way, the P T , T ρ and P ρ phase diagrams for each potential were obtained, with all fluid and solid phases. The phase boundaries were defined analyzing the specific heat at constant pressure, the system mean square displacement, the radial distribution function and the discontinuities in the density-pressure phase diagram. Also, due the competition in the system we have observed the presence of waterlike anomalies, such as the temperature of maximum density -in addition with a tendency of the TMD to move to lower temperatures (negative slope)-and the diffusion anomaly. It was observed different morphologies (stripes, honeycomb, amorphous) for each nanoparticle. We observed that for the fixed polymers case the waterlike anomalies are originated by the competition between the potential characteristic length scales, while for the free to rotate case the anomalies arises due a smaller region of stability in the phase diagram and no competition between the scales was observed.

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Two-dimensional systems with competing interactions: dynamic properties of single particles and of clusters

Cited by 14 publications

References 40 publications

Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores

Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores

Solution of Disordered Microphases in the Bethe approximation

Waterlike anomalies in hard core–soft shell nanoparticles using an effective potential approach: Pinned vs adsorbed polymers

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