arXiv subjects

Peter Oleynikov

Publications and source records attributed to Peter Oleynikov.

3 recordsLinked to original sources

arXiv2019

Self-assembly of orthorhombic Fddd network in simple one-component liquids

Triply periodic continuous morphologies arising a result of the microphase separation in block copolymer melts have so far never been observed self-assembled in systems of particles with spherically symmetric interaction. We report a molecular dynamics simulation of two simple one-component liquids which self-assemble upon cooling into equilibrium orthorhombic continuous network morphologies with the Fddd space group symmetry reproducing the structure of those observed in block copolymers. The finding that the geometry of constituent molecules isn't relevant for the formation of triply periodic networks indicates the generic nature of this class of phase transition.

cond-mat.soft↗

arXiv2015

New kind of dodecagonal quasicrystal

We report a novel kind of dodecagonal quasicrystal that has so far never been observed, nor theoretically predicted. It is composed of axially stacked hexagonal particle layers, with 12-fold rotational symmetry induced by 30 degrees rotation of adjacent layers with respect to each other. The quasicrystal was produced in a molecular-dynamics simulation of a single-component system of particles interacting via a spherically-symmetric potential, as a result of a first-order phase transition from a liquid phase under constant-density cooling. This finding implies that a similarly structured quasicrystal can possibly be produced by the mesogens of the kind that produce smectic-B crystals and in a system of spherically-shaped colloidal particles with appropriately tuned potential.

cond-mat.soft↗

arXiv2014

Formation of a New Archetypal Metal-Organic Framework from a Simple Monatomic Liquid

We report a molecular-dynamics simulation of a single-component system of particles interacting via a spherically symmetric potential that is found to form, upon cooling from a liquid state, a low-density porous crystalline phase. Its structure analysis demonstrates that the crystal can be described by a net with a topology that belongs to the class of topologies characteristic of the metal-organic frameworks (MOFs). The observed net is new, and it is now included in the Reticular Chemistry Structure Resource database (RCSR). The observation that a net topology characteristic of MOF crystals, which are known to be formed by a coordination-driven self-assembly process, can be reproduced by a thermodynamically stable configuration of a simple single-component system of particles opens a possibility of using these models in studies of MOF nets. It also indicates that structures with MOF topology, as well as other low-density porous crystalline structures can possibly be produced in colloidal systems of spherical particles, with an appropriate tuning of interparticle interaction.

cond-mat.mtrl-sci↗