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Article

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

1
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
2
Instituto de Química Física Rocasolano, CSIC, C/ Serrano 119, 28006 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Małgorzata Borówko
Int. J. Mol. Sci. 2021, 22(20), 11050; https://doi.org/10.3390/ijms222011050
Received: 16 September 2021 / Revised: 8 October 2021 / Accepted: 10 October 2021 / Published: 13 October 2021
(This article belongs to the Special Issue Advances in Molecular Simulation)
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. View Full-Text
Keywords: colloids with competing interactions; periodic microphases; confinement colloids with competing interactions; periodic microphases; confinement
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MDPI and ACS Style

Serna, H.; Góźdź, W.T.; Noya, E.G. Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores. Int. J. Mol. Sci. 2021, 22, 11050. https://doi.org/10.3390/ijms222011050

AMA Style

Serna H, Góźdź WT, Noya EG. Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores. International Journal of Molecular Sciences. 2021; 22(20):11050. https://doi.org/10.3390/ijms222011050

Chicago/Turabian Style

Serna, Horacio, Wojciech T. Góźdź, and Eva G. Noya 2021. "Structural and Dynamical Behaviour of Colloids with Competing Interactions Confined in Slit Pores" International Journal of Molecular Sciences 22, no. 20: 11050. https://doi.org/10.3390/ijms222011050

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