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A new kind of soft-matter quasicrystal
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-0237-7250
(English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723Article in journal (Refereed) Submitted
Abstract [en]

Quasiperiodic order in mesoscopic soft-matter systems is now a new research frontier of rapidly growing interest \cite{DUB}. Here, we report a novel kind of soft-matter quasicrystal that has so far never been observed, nor theoretically predicted. It represents a structure composed of hexagonally densely packed particle layers axially stacked in a $ABA...$ order, resembling smectic-$B$ crystal \cite{CHANDR}. In contrast to the latter, $A$ and $B$ layers in this structure are rotated by $30^{\circ}$ with respect to each other, in the layer plane, which induces 12-fold global rotational symmetry. So far, the only kind of quasiperiodic order observed in smectic phases \cite{CHANDR} has been twist grain boundaries (TGB) structure induced by commensurate helical rotation of the smectic slabs around the axis parallel to the layer plane \cite{LUB, GOOD}. The quasicrystal we report 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. The simple isotropic form of the pair potential used in this simulation makes it possible to expect that this type of quasicrystal can also be produced in a system of spherically-shaped colloidal particles with appropriately tuned force field.

Keyword [en]
smectic-b, quasicrystal, soft matter, condensed matter, molecular dynamics
National Category
Condensed Matter Physics
Research subject
Physical Chemistry
Identifiers
URN: urn:nbn:se:su:diva-115848OAI: oai:DiVA.org:su-115848DiVA: diva2:800394
Available from: 2015-04-03 Created: 2015-04-03 Last updated: 2017-12-04
In thesis
1. On the nature of self-assembly in low-density condensed matter: A classical molecular dynamics approach
Open this publication in new window or tab >>On the nature of self-assembly in low-density condensed matter: A classical molecular dynamics approach
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The study of the physics of self-assembly in low-density condensed matter is an extremely interesting, mostly unexplored field of scientific research. The contribution reported in this thesis explains how this problem can be addressed using molecular dynamics simulation of 3D systems composed by simple, identical particles, interacting via a spherically symmetric pair potential, which belongs to the class of Dzugutov potentials. Such approach resulted in four, self-assembled archetypal structures, which are reported in the included papers I, II, III, IV. In order to produce the reported results, a major effort of software development has been done by the author, both in the simulation and the analysis programs used. This thesis will start with a brief introduction to the field, highlighting the important aspects needed to have a more complete, general understanding of the reported scientific results. Some conclusions will be drawn, together with some possible future endeavors.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2015. 96 p.
National Category
Condensed Matter Physics Physical Chemistry
Research subject
Physical Chemistry
Identifiers
urn:nbn:se:su:diva-115849 (URN)978-91-7649-149-2 (ISBN)
Public defence
2015-05-12, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Submitted. Paper 4: Submitted. Paper 5: Submitted.

Available from: 2015-04-20 Created: 2015-04-03 Last updated: 2015-04-23Bibliographically approved

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