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Showing 1–11 of 11 results
Advanced filters: Author: Goran Ungar Clear advanced filters

  • Coordinated osmotic shocks within ordered materials lead to nanoperforated multilayer structures that may find application in photonics, optoelectronics and ultrafiltration.

    • Patrick Theato
    • Goran Ungar
    News & Views
    Nature Materials
    Volume: 11, P: 16-17

  • T- and X-shaped polyphilic liquid crystals can generate ordered structures with potential nanotechnology applications. Here, the inability of polyphiles to achieve optimal packing and complete nanophase separation is exploited to produce a flexible two-dimensional honeycomb with giant octagonal and square cylinders.

    • Feng Liu
    • Robert Kieffer
    • Carsten Tschierske
    Research
    Nature Communications
    Volume: 3, P: 1-7

  • A 3D‐ordered liquid crystal phase of regular right and left helically twisted columns self‐assembles from straight‐ and bent‐rod molecules. Here calculations indicate that, among four alternative models, the observed complex Fddd structure provides the lowest packing energy for twisted ribbons.

    • Ya-xin Li
    • Hong-fei Gao
    • Goran Ungar
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-11

  • Melting is considered a strictly first-order transition and therefore cannot proceed continuously. Here the authors challenge this concept for long-chain compounds by demonstrating continuous melting of thin layers on graphite where the barrier for such melting, the interface crowding, is removed.

    • Ruibin Zhang
    • William S. Fall
    • Goran Ungar
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-7

  • The morphology of semicrystalline plastics on the 1-100 μm scale, such as spherulites, strongly affect mechanical and other properties of the material but currently only 2D imaging techniques are available. Here, the authors use fluorescence labels and confocal microscopy to visualize the internal structure of neat polymers and composites in 3D and reveal unsuspected morphologies.

    • Shu-Gui Yang
    • Zhen-Zhen Wei
    • Goran Ungar
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • Quasicrystals are intriguing structures that exhibit long-range positional correlations but no periodicity in real space. Now, T-shaped amphiphilic molecules featuring rigid cores have been found to self-assemble into a columnar liquid quasicrystal with dodecagonal symmetry. The honeycomb structure observed arises from a strictly quasiperiodic tessellation of square, triangular and trapezoidal tiles, rather than from random tiling.

    • Xiangbing Zeng
    • Benjamin Glettner
    • Carsten Tschierske
    Research
    Nature Chemistry
    Volume: 15, P: 625-632

  • Zeolites with regular porous structures are widely used as gas adsorbents and scaffolding for catalysts. Poppe et al. report a liquid crystal with zeolite-like structure by self-assembly of polyphilic molecules with π-conjugated rod-like cores into a honeycomb formed by pentagonal/octagonal channels.

    • Silvio Poppe
    • Anne Lehmann
    • Carsten Tschierske
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-7

  • The structural order of supramolecular assemblies typically depends on the enantiomeric purity of their building blocks. Now, a perylene bisimide (PBI) derivative has been described that assembles into a single-handed supramolecular helix, which in turn packs into domains with an identical crystalline order irrespective of the PBI's chirality. A cogwheel mechanism is proposed.

    • Cécile Roche
    • Hao-Jan Sun
    • Virgil Percec
    Research
    Nature Chemistry
    Volume: 8, P: 80-89

  • Hall-Petch behaviour dictates that with a reduction in grain size the strength of a polycrystalline material increases. Here, the authors model glass-crystal composites of soft and hard particles uncovering a power-law strengthening behaviour beyond the Hall-Petch and inverse-Hall-Petch regimes when grain size is reduced to below 3 nm.

    • Huijun Zhang
    • Feng Liu
    • Yilong Han
    ResearchOpen Access
    Communications Physics
    Volume: 5, P: 1-9