Topological phases in nanoparticle monolayers: can crystalline, hexatic, and isotropic-fluid phases coexist in the same monolayer?

Bhattacharjee, Kaustav; Vaidya, Salil S.; Pathak, Tushar; Shimpi, Jayesh R.; Prasad, Bhagavatula L. V.

doi:10.1039/d3sm00290j

Soft Matter

2023

DOI: 10.1039/d3sm00290j

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Topological phases in nanoparticle monolayers: can crystalline, hexatic, and isotropic-fluid phases coexist in the same monolayer?

Kaustav Bhattacharjee,

Salil S. Vaidya,

Tushar Pathak

et al.

Abstract: Topological phases are stable configurations of matter in 2-dimension formed via spontaneous symmetry breaking. We show that due to local deviation in particle size, different topological phases can coexist in a self-assembled nanoparticle monolayer.

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2024

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Random close packing of semi-flexible polymers in two dimensions: Emergence of local and global order

Martínez-Fernández,

Pedrosa,

Herranz

et al. 2024

The Journal of Chemical Physics

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Through extensive Monte Carlo simulations, we systematically study the effect of chain stiffness on the packing ability of linear polymers composed of hard spheres in extremely confined monolayers, corresponding effectively to 2D films. First, we explore the limit of random close packing as a function of the equilibrium bending angle and then quantify the local and global order by the degree of crystallinity and the nematic or tetratic orientational order parameter, respectively. A multi-scale wealth of structural behavior is observed, which is inherently absent in the case of athermal individual monomers and is surprisingly richer than its 3D counterpart under bulk conditions. As a general trend, an isotropic to nematic transition is observed at sufficiently high surface coverages, which is followed by the establishment of the tetratic state, which in turn marks the onset of the random close packing. For chains with right-angle bonds, the incompatibility of the imposed bending angle with the neighbor geometry of the triangular crystal leads to a singular intra- and inter-polymer tiling pattern made of squares and triangles with optimal local filling at high surface concentrations. The present study could serve as a first step toward the design of hard colloidal polymers with a tunable structural behavior for 2D applications.

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Random close packing of semi-flexible polymers in two dimensions: Emergence of local and global order

Martínez-Fernández,

Pedrosa,

Herranz

et al. 2024

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

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Topological phases in nanoparticle monolayers: can crystalline, hexatic, and isotropic-fluid phases coexist in the same monolayer?

Abstract: Topological phases are stable configurations of matter in 2-dimension formed via spontaneous symmetry breaking. We show that due to local deviation in particle size, different topological phases can coexist in a self-assembled nanoparticle monolayer.

Cited by 1 publication

References 62 publications

Random close packing of semi-flexible polymers in two dimensions: Emergence of local and global order

Random close packing of semi-flexible polymers in two dimensions: Emergence of local and global order

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