Goran Ungar
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View article: Control of Magnetic Properties of Liquid-Crystalline Dendron-Modified FePt Nanoparticles through Thermal Phase Transition for Tunable Magnetic Materials
Control of Magnetic Properties of Liquid-Crystalline Dendron-Modified FePt Nanoparticles through Thermal Phase Transition for Tunable Magnetic Materials Open
FePt nanoparticles (NPs) with thermally responsive array structures were prepared by surface modification with a liquid-crystalline phenylethyl ether-type dendron. Dendron modification was carried out in two steps. In the first step, COOH …
View article: On the Mechanism of Soft Self‐Assembly from Melt: The Ubiquitous Heat Capacity Hump and Spontaneous Melt Chirality
On the Mechanism of Soft Self‐Assembly from Melt: The Ubiquitous Heat Capacity Hump and Spontaneous Melt Chirality Open
We investigate two unusual phenomena in self‐assembly of anisotropic molecules from isotropic (Iso) melt: a heat‐capacity ( C p ) maximum and spontaneous formation of the recently discovered chiral liquid (Iso*). Based on experiments on ne…
View article: On the Mechanism of Soft Self‐Assembly from Melt: The Ubiquitous Heat Capacity Hump and Spontaneous Melt Chirality
On the Mechanism of Soft Self‐Assembly from Melt: The Ubiquitous Heat Capacity Hump and Spontaneous Melt Chirality Open
We investigate two unusual phenomena in self‐assembly of anisotropic molecules from isotropic (Iso) melt: a heat‐capacity ( C p ) maximum and spontaneous formation of the recently discovered chiral liquid (Iso*). Based on experiments on ne…
View article: Tuning Aggregation in Liquid‐Crystalline Squaraine Chromophores
Tuning Aggregation in Liquid‐Crystalline Squaraine Chromophores Open
For a series of novel hydroxy anilino squaraines (SQ), separated via short flexible spacers from bulky dendrons, hexagonal columnar (Col hex ) liquid‐crystalline (LC) phase behavior is detected. The optical properties of these SQ systems, …
View article: Thermotropic “Plumber's Nightmare”—A Tight Liquid Organic Double Framework
Thermotropic “Plumber's Nightmare”—A Tight Liquid Organic Double Framework Open
Gyroid, double diamond and the body‐centred “Plumber's nightmare” are the three most common bicontinuous cubic phases in lyotropic liquid crystals and block copolymers. While the first two are also present in solvent‐free thermotropics, th…
View article: Thermotropic “Plumber's Nightmare”—A Tight Liquid Organic Double Framework
Thermotropic “Plumber's Nightmare”—A Tight Liquid Organic Double Framework Open
Gyroid, double diamond and the body‐centred “Plumber's nightmare” are the three most common bicontinuous cubic phases in lyotropic liquid crystals and block copolymers. While the first two are also present in solvent‐free thermotropics, th…
View article: Molecular Simulations of Quantized Lamellar Thickening in Polyethylenes with Regularly Spaced Brominated Groups
Molecular Simulations of Quantized Lamellar Thickening in Polyethylenes with Regularly Spaced Brominated Groups Open
Polyethylene (PE) chains, with CH2 groups replaced by CBr2 at regular intervals ("precision PE"), have been observed to exhibit competing polymorphs driven by a preference for quantized fold lengths by Tasaki et al. Motivated by this recen…
View article: Supertwisted Chiral Gyroid Mesophase in Chiral Rod‐Like Compounds
Supertwisted Chiral Gyroid Mesophase in Chiral Rod‐Like Compounds Open
Among the intriguing bicontinuous self‐assembled structures, the gyroid cubic is the most ubiquitous. It is found in block and star polymers, surfactants with or without solvent, in thermotropic liquid crystals with end‐ or side‐chains, an…
View article: Supertwisted Chiral Gyroid Mesophase in Chiral Rod‐Like Compounds
Supertwisted Chiral Gyroid Mesophase in Chiral Rod‐Like Compounds Open
Among the intriguing bicontinuous self‐assembled structures, the gyroid cubic is the most ubiquitous. It is found in block and star polymers, surfactants with or without solvent, in thermotropic liquid crystals with end‐ or side‐chains, an…
View article: Quantitative Model of Multiple Crystal Growth Rate Minima in Polymers with Regularly Spaced Substituent Groups
Quantitative Model of Multiple Crystal Growth Rate Minima in Polymers with Regularly Spaced Substituent Groups Open
A simple theory has been developed to explain quantitatively the multiple crystal growth rate minima observed experimentally in polyethylene brassylates (PEBs), polymers with regularly spaced "chemical defects", in this case, diester group…
View article: Orientational transitions of discotic columnar liquid crystals in cylindrical pores
Orientational transitions of discotic columnar liquid crystals in cylindrical pores Open
Configurations of soft columns confined in a hard cylindrical pore tuned by pore size, column flexibility and surface anchoring.
View article: Continuous Spectrum of Morphologies and Phase Behavior across the Contact Zone from Poly(<scp>l</scp>-lactide) to Poly(<scp>d</scp>-lactide): Stereocomplex, Homocrystal, and Between
Continuous Spectrum of Morphologies and Phase Behavior across the Contact Zone from Poly(<span>l</span>-lactide) to Poly(<span>d</span>-lactide): Stereocomplex, Homocrystal, and Between Open
The enantiomeric ratio is a key factor affecting the crystallization behavior and morphology of poly-l-lactide/poly-d-lactide (PLLA/PDLA) blends. Despite a number of studies on crystallization of nonequimolar PLLA/PDLA blends, a full pictu…
View article: Enantiomers Self-Sort into Separate Counter-Twisted Ribbons of the <i>Fddd</i> Liquid Crystal─Antiferrochirality and Parachirality
Enantiomers Self-Sort into Separate Counter-Twisted Ribbons of the <i>Fddd</i> Liquid Crystal─Antiferrochirality and Parachirality Open
The recently discovered orthorhombic liquid crystal (LC) phase of symmetry Fddd is proving to be widespread. In this work, a chiral hydroxybutyrate linkage is inserted into the molecular core of hexacatenar rodlike compounds, contai…
View article: 3D Morphology of Different Crystal Forms in β-Nucleated and Fiber-Sheared Polypropylene: α-Teardrops, α-Teeth, and β-Fans
3D Morphology of Different Crystal Forms in β-Nucleated and Fiber-Sheared Polypropylene: α-Teardrops, α-Teeth, and β-Fans Open
Polymorphism of semicrystalline polymers has significant influence on their physical properties, with each form having its advantages and disadvantages. However, real-life polymer processing often results in different coexisting crystal po…
View article: Reentrant 2D Nanostructured Liquid Crystals by Competition between Molecular Packing and Conformation: Potential Design for Multistep Switching of Ionic Conductivity
Reentrant 2D Nanostructured Liquid Crystals by Competition between Molecular Packing and Conformation: Potential Design for Multistep Switching of Ionic Conductivity Open
The front cover artwork is provided by Takashi Kato at the University of Tokyo. The image shows three assembled structures of smectic liquid crystals that show reentrant behavior. Read the full text of the Research Article at 10.1002/cphc.…
View article: Cover Feature: The Effect of Mesogenic Coronas on the Type and Anisotropy of Gold Nanoparticle Superlattices: When Can the Tail Wag the Dog? (Chem. Eur. J. 11/2023)
Cover Feature: The Effect of Mesogenic Coronas on the Type and Anisotropy of Gold Nanoparticle Superlattices: When Can the Tail Wag the Dog? (Chem. Eur. J. 11/2023) Open
Graphical Abstract Gold nanoparticles are giants compared to the ligands grafted to their surfaces. The particles weigh several hundred kDa, an organic ligand just 1 kDa. Yet by designing the shape of these small ligands, particularly the …
View article: Poisoning by Purity: What Stops Stereocomplex Crystallization in Polylactide Racemate?
Poisoning by Purity: What Stops Stereocomplex Crystallization in Polylactide Racemate? Open
Formation of stereocomplex crystals (SC) is an effective way to improve the heat resistance and mechanical performance of poly(lactic acid) products. However, at all but the slowest cooling rates, SC crystallization of a high-molecular-wei…
View article: Reentrant 2D Nanostructured Liquid Crystals by Competition between Molecular Packing and Conformation: Potential Design for Multistep Switching of Ionic Conductivity
Reentrant 2D Nanostructured Liquid Crystals by Competition between Molecular Packing and Conformation: Potential Design for Multistep Switching of Ionic Conductivity Open
Reentrant phenomena in soft matter and biosystems have attracted considerable attention because their properties are closely related to high functionality. Here, we report a combined experimental and computational study on the self‐assembl…
View article: A Columnar Liquid Quasicrystal with a Honeycomb Structure that Consists of Triangular, Square and Trapezoidal Cells
A Columnar Liquid Quasicrystal with a Honeycomb Structure that Consists of Triangular, Square and Trapezoidal Cells Open
Source data for the paper to be published on Nature Chemsitry.
View article: The Effect of Mesogenic Coronas on the Type and Anisotropy of Gold Nanoparticle Superlattices: When Can the Tail Wag the Dog?
The Effect of Mesogenic Coronas on the Type and Anisotropy of Gold Nanoparticle Superlattices: When Can the Tail Wag the Dog? Open
The correlation between the size of nanoparticles, the structure and shape of mesogenic ligands and the ensuing assembly behaviour is not really understood. Closer inspection shows very surprising features. Here, 2‐ and 4‐nm gold nanoparti…
View article: A regime beyond the Hall–Petch and inverse-Hall–Petch regimes in ultrafine-grained solids
A regime beyond the Hall–Petch and inverse-Hall–Petch regimes in ultrafine-grained solids Open
The strength of polycrystal increases as the grain diameter l decreases, i.e. the Hall–Petch behaviour. This trend reverses at about 3 < l < 15 nm, i.e. the inverse-Hall–Petch behaviour. How the grain size affects material’s strength at l …
View article: Morphology of Shear-Induced Polymer Cylindrites Revealed by 3D Optical Imaging
Morphology of Shear-Induced Polymer Cylindrites Revealed by 3D Optical Imaging Open
Two-photon confocal laser microscopy was used to obtain three-dimensional (3D) images of the morphology of poly(lactic acid) after shear-induced crystallization. The necessary fluorescence contrast was achieved by doping the polymer with N…
View article: Understanding and Manipulating Helical Nanofilaments in Binary Systems with Achiral Dopants
Understanding and Manipulating Helical Nanofilaments in Binary Systems with Achiral Dopants Open
Here, we report the relationship between helical pitch of the helical nanofilament (HNF) phase formed by bent-core molecule NOBOW and the concentration of achiral dopants 5CB and octane, using linearly polarized resonant soft X-ray scatter…
View article: Self‐assembly of Gold Nanoparticles into an Adjustable Plasmonic 3D Lattice using Janus‐type Forked Mesogenic Ligands
Self‐assembly of Gold Nanoparticles into an Adjustable Plasmonic 3D Lattice using Janus‐type Forked Mesogenic Ligands Open
We report the formation of a 3D body‐centred self‐assembled superlattice of gold nanoparticles whose interparticle gap, and hence its plasmonic properties, are adjustable exclusively in the xy ‐plane. Thus, even though the particles are sp…
View article: A Columnar Liquid Quasicrystal – Honeycomb with Triangular, Square and Trapezoidal Cells
A Columnar Liquid Quasicrystal – Honeycomb with Triangular, Square and Trapezoidal Cells Open
Quasicrystals are intriguing structures, having long-range positional correlations but no periodicity, typically with rotational symmetries that are “forbidden” in normal crystals. Here we present the discovery of a two-dimensional columna…
View article: A case of antiferrochirality in a liquid crystal phase of counter-rotating staircases
A case of antiferrochirality in a liquid crystal phase of counter-rotating staircases Open
View article: Self-organization of rectangular bipyramidal helical columns by supramolecular orientational memory epitaxially nucleated from a Frank-Kasper σ phase
Self-organization of rectangular bipyramidal helical columns by supramolecular orientational memory epitaxially nucleated from a Frank-Kasper σ phase Open
View article: Bowls, vases and goblets—the microcrockery of polymer and nanocomposite morphology revealed by two-photon optical tomography
Bowls, vases and goblets—the microcrockery of polymer and nanocomposite morphology revealed by two-photon optical tomography Open
View article: Nearly monodisperse unimolecular micelles via chloro-based atom transfer radical polymerization
Nearly monodisperse unimolecular micelles via chloro-based atom transfer radical polymerization Open
Fabrication of unimolecular micelles with uniform sizes and well-controlled structure is currently a big challenge. Herein, we report an easy-to-handle protocol for the preparation of nearly monodisperse unimolecular micelles via atom tran…
View article: Bowls, Vases and Goblets – The Microcrockery of Polymer and Nanocomposite Morphology Revealed by Two-Photon Optical Tomography
Bowls, Vases and Goblets – The Microcrockery of Polymer and Nanocomposite Morphology Revealed by Two-Photon Optical Tomography Open
On the >1µm scale the morphology of semicrystalline plastics like polyethylene or Nylon features spherulites, “shish-kebabs”, cylinddrites and other crystalline aggregates which strongly affect mechanical and other material properties. Cur…