Chiral Plastic Crystal of Solid-State Dual Rotators

Sato, Chuichiro; Takeda, Takashi; Dekura, Shun; Suzuki, Yasutaka; Kawamata, Jun; Akutagawa, Tomoyuki

doi:10.1021/acs.cgd.3c00495

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…18,23,24 From the viewpoint of chemical design and synthesis, molecules exhibiting spherical geometries are often utilized to cultivate plastic crystals with desirable properties such as high symmetry, plasticity, and long-range order. [25][26][27] Besides, because of their high barocaloric effect, they are currently attracting a lot of attention as potential environmentally friendly solidstate refrigeration solutions in the future. [28][29][30] To systematically design plastic crystals, organic molecules with a globular conformation, such as quinuclidine and DABCO, are often paired with anions like perchlorate, perrhenate, etc.…”

Section: Introductionmentioning

confidence: 99%

Plastic phase transitions in tris(hydroxymethyl)aminomethane perchlorate

Zhou,

Weng,

Shi

et al. 2024

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Plastic phase transitions in tris(hydroxymethyl)aminomethane perchlorate

Zhou,

Weng,

Shi

et al. 2024

Dalton Trans.

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Solid Solutions of Plastic/Ferroelectric Crystals: Toward Tailor-Made Functional Materials

Harada,

Takehisa,

Kawamura

et al. 2024

J. Am. Chem. Soc.

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Plastic crystals that show ferroelectricity are highly promising materials for a wide range of applications. Their inherent remarkable malleability and highly symmetric cubic structures in the plastic crystal phase ensure that their ferroelectricity and related properties are retained in their bulk polycrystals. To develop functional materials based on such plastic/ferroelectric crystals, methods to tune their properties for specific applications are required. Here, we report the preparation of solid solutions of plastic/ferroelectric ionic crystals by mixing crystals with a common anion but different cations, or crystals with a common cation but different anions, which allows a continuous modification of the Curie temperature of the ferroelectric system over a range of 100 K. This adjustment of the Curie temperature allows the flexible tuning of the pyroelectric properties of the solid solutions, including a significant enhancement of room-temperature performance. The solid solutions also exhibit morphotropic phase boundaries in the composition−temperature phase diagrams, which shows an abrupt change in crystal structures with a variation of composition. This study showcases a simple and versatile property-tuning method that can be expected to pave the way for major progress in the development of materials based on plastic/ferroelectric crystals, which will eventually advance to the stage of pursuing tailor-made functional materials with desired properties.

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Geometric modeling of phase ordering for the isotropic–smectic A phase transition

Zamora Cisneros,

Wang,

Dorval Courchesne

et al. 2024

Front. Soft Matter

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BackgroundLiquid crystal (LC) mesophases have an orientational and positional order that can be found in both synthetic and biological materials. These orders are maintained until some parameter, mainly the temperature or concentration, is changed, inducing a phase transition. Among these transitions, a special sequence of mesophases has been observed, in which priority is given to the direct smectic liquid crystal transition. The description of these transitions is carried out using the Landau–de Gennes (LdG) model, which correlates the free energy of the system with the orientational and positional order.MethodologyThis work explored the direct isotropic-to-smectic A transition studying the free energy landscape constructed with the LdG model and its relation to three curve families: (I) level-set curves, steepest descent, and critical points; (II) lines of curvature (LOC) and geodesics, which are directly connected to the principal curvatures; and (III) the Casorati curvature and shape coefficient that describe the local surface geometries resemblance (sphere, cylinder, and saddle).ResultsThe experimental data on 12-cyanobiphenyl were used to study the three curve families. The presence of unstable nematic and metastable plastic crystal information was found to add information to the already developed smectic A phase diagram. The lines of curvature and geodesics were calculated and laid out on the energy landscape, which highlighted the energetic pathways connecting critical points. The Casorati curvature and shape coefficient were computed, and in addition to the previous family, they framed a geometric region that describes the phase transition zone.Conclusion and significanceA direct link between the energy landscape’s topological geometry, phase transitions, and relevant critical points was established. The shape coefficient delineates a stability zone in which the phase transition develops. The methodology significantly reduces the impact of unknown parametric data. Symmetry breaking with two order parameters (OPs) may lead to novel phase transformation kinetics and droplets with partially ordered surface structures.

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Chiral Plastic Crystal of Solid-State Dual Rotators

Cited by 3 publications

References 58 publications

Plastic phase transitions in tris(hydroxymethyl)aminomethane perchlorate

Plastic phase transitions in tris(hydroxymethyl)aminomethane perchlorate

Solid Solutions of Plastic/Ferroelectric Crystals: Toward Tailor-Made Functional Materials

Geometric modeling of phase ordering for the isotropic–smectic A phase transition

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