Confinement of Colloids with Competing Interactions in Ordered Porous Materials

Serna, Horacio; Noya, Eva G.; Góźdź, Wojciech T.

doi:10.1021/acs.jpcb.0c08148

Cited by 7 publications

(6 citation statements)

References 44 publications

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“…Local density isosurfaces ρ * iso = 0.30 for all the ordered microphases obtained at different slit widths, W * . Note that the density chosen for the isosurfaces is somewhat lower than that in our previous work on SALR systems modelled with the square-well linear model (in which we chose ρ * iso = 0.40) [25][26][27]. The reason for this new choice is that the clusters obtained with the Lennard-Jones plus Yukawa model used in this work are appreciably smaller [17].…”

Section: Equilibrium Propertiesmentioning

confidence: 95%

“…In particular, the cluster-crystal is able to survive up to T * = 0.30 when confined in pores of sizes W * = 5, 7 and 11, whereas in bulk it melts at T * = 0.20 − 0.25 depending on the density. Shifts in the coexistence lines between two phases are common under confinement and have been observed either in complex [26,27,35] and simple [36] fluids. On the contrary, for the pore size W * = 9, the structure remains only partially ordered down to T * = 0.20.…”

Section: Low Density: the Cluster-crystalmentioning

confidence: 99%

“…We also found that new phases that are not stable in bulk can be stabilised when confined by the appropriate pore geometry. In this way, cluster-crystals with different symmetries were obtained by confinement in bicontinuous porous materials [27]. Surprisingly, the study of confinement in simple geometries, such as a slit pore, has not been sufficiently explored.…”

Section: Introductionmentioning

confidence: 99%

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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: Equilibrium Propertiesmentioning

confidence: 95%

Section: Low Density: the Cluster-crystalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Serna

Góźdź

Noya

2021

IJMS

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“…Besides the obvious technological applications, the described material can be useful for basic research on the relationship between the geometry of confining walls and topology of structures that appear in such confinement. The fact that such correlations do exists have been pointed out in recent papers on structures formed by particles interacting with short-range-attraction-long range-repulsion (SARL) potential 44 , 45 . The plastics can be easily confined in narrow capillaries with diameters below 100 μm, and we can expect that structures of polypropylene scaffold will depend on the capillary diameter.…”

Section: Discussionmentioning

confidence: 93%

A camphene-camphor-polymer composite material for the production of superhydrophobic absorbent microporous foams

Löffler

Hanczyc

Górecki

2022

Sci Rep

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In a recently published paper (doi.org/10.3390/molecules26113116) on self-propelled motion of objects on the water surface, we described a novel surface-active plastic material obtained by dissolution of camphor and polypropylene in camphene at 250 $$^\circ$$ ∘ C. The material has wax-like mechanical properties, can be easily formed to any moldable shape, and allows for longer and more stable self-propelled motion if compared with pure camphor or pure camphene or of a camphene-camphor wax. Here we use scanning electron microscopy to visualize and characterize the microporous structure of the solid polypropylene foam formed in the plastic for different polypropylene contents. The topology of foams remaining in the material after camphor and camphene molecules have been removed through evaporation or dissolution is similar to polypropylene foams obtained using thermally-induced phase separation. We show that the foams have a superhydrophobic surface but strongly absorb non-polar liquids, and suggest an array of potential scientific and industrial applications.

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“…Additionally, structure of colloidal systems has been extensively studied by molecular dynamics and Monte Carlo simulations and the presence of patterns have been found for 3D bulk [42], 2D bulk [60][61][62] and confined systems [52,[63][64][65][66][67][68][69][70][71]. Significant differences are reported when going from a 2D to a quasi-2D system.…”

Section: Of 12mentioning

confidence: 99%

How Dimensionality Affects the Structural Anomaly in a Core-Softened Collo

Krott¹,

Bordin²

2023

Preprint

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The interaction between hard-core soft-shell colloids are characterized by having two characteristic distances: one associated with the penetrable, soft corona and another one corresponding to the impenetrable core. Isotropic core-softened potentials with two characteristic length scales have long been applied to understand the properties of such colloids. Those potentials usually show waterlike anomalies, and recent findings have indicated the existence of multiple anomalous regions in the 2D limit under compression, while in 3D only one anomalous region is observed. In this direction, we perform Molecular Dynamics simulations to unveil the details about the structural behavior in the quasi-2D limit of a core-softened colloid. The fluid was confined between highly repulsive solvophobic walls, and the behavior at distinct wall separation and colloid density was analyzed. Our results indicated a straight relation between the 2D or 3D-like behavior and the layers separation. We can relate that if the system behaves as independent 2D-layers, it will have a 2D-like behavior. However, for some separations the layers are connected, with colloids hopping from one layer to another – having then a 3D-like structural behavior. Those findings fill the gap in the depiction of the anomalous behavior from 2D to 3D.

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Confinement of Colloids with Competing Interactions in Ordered Porous Materials

Cited by 7 publications

References 44 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

A camphene-camphor-polymer composite material for the production of superhydrophobic absorbent microporous foams

How Dimensionality Affects the Structural Anomaly in a Core-Softened Collo

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