[Todos] CHARLA IFLYSIB VIRTUAL - Viernes 29/4/2022 10:30 hs - Self-assembly in mixtures with competing interactions

[Charlas IFLYSIB]

*Dada la situación actual en relación al COVID-19, el IFLySIB realiza sus
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participar a través del link *https://utn.zoom.us/j/89038134365
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*Charla IFLYSIB VIRTUAL*
*Viernes 29/4/2022, 10:30hs. *
*Link: **https://utn.zoom.us/j/89038134365
<https://utn.zoom.us/j/89038134365>*


*Título: *
*Self-assembly in mixtures with competing interactions*


*Expositor:*

*Alina Ciach *
*Institute of Physical Chemistry of the Polish Academy of Sciences (Warsaw,
Poland)*


*Resumen:*
*A binary mixture of particles interacting with spherically-symmetrical
potentials leading to microsegregation is studied by theory and molecular
dynamics (MD) simulations. We consider spherical particles with equal
diameters and volume fractions. Motivated by the mixture of oppositely
charged particles with different adsorption preferences immersed in a
near-critical binary solvent, we assume short-range attraction long-range
repulsion for the interaction between like particles and short-range
repulsion long-range attraction for the interaction between different ones.
Both theory and MD simulations show coexistence of a low-density disordered
phase with a high-density phase with alternating layers rich in the first
and second components. In these layers, crystalline structure is present in
the solid and absent in the liquid crystals that are stable at lower and
higher temperature, respectively. At the phase coexistence of the
disordered and ordered phases, the density and the degree of order of the
ordered phase decrease with increasing temperature, up to a temperature
where the theory predicts a narrow two-phase region with increasing density
of both phases for increasing temperature. MD simulations show that
monocrystals of the solid and liquid crystals have a prolate shape with the
axis parallel to the direction of concentration oscillations, and the
deviation from the spherical shape increases with increasing periodic
order.*

[image: image.png]


Ref.: Oksana Patsahan, Marek Litniewski and Alina Ciach. "Self-assembly in
mixtures with competing interactions." *Soft Matter* 17.10 (2021):
2883-2899. <https://doi.org/10.1039/D0SM02072A>




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