Materials Literature
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We present the design of a micropillar array that leads to the formation of stable and uniform liquid crystal (LC) thin films for sensing applications. Photolithography and electroplating methods were employed to fabricate the micropillar array. By using this microfabricated structure, thin films of LC (5CB: 4'-pentyl…
BaTiO 3 (BT) ceramics with various grain sizes are prepared by spark plasma sintering (SPS), two-step sintering, and conventional sintering. The field-induced displacement and piezoelectric constant measured by a resonant–antiresonant frequency method are evaluated. The BT ceramics prepared by SPS are characterized by…
We develop a model based on Fick's law of diffusion as a phenomenological description of the molecular motion, and on the coupled mode theory, to describe single-beam surface relief grating formation in azopolymer thin films. The model allows us to explain the mechanism of spontaneous patterning, and self-organization…
In a basic solution of Ni(ClO 4 ) 2 ·6H 2 O and pyridine-2-amidoxime (H 2 pyaox), tetranuclear [Ni 4 (Hpyaox) 2 (pyaox) 2 ] 2+ fragments are formed that self-assemble to generate single-, double-, or triple-decker clusters [Ni 4 (Hpyaox) 2 (pyaox) 2 (Him) 4 ](ClO 4 ) 2 ( 1 ), [Ni 8 (Hpyaox) 4 (pyaox) 4 (H 2 O) 4 ](ClO…
Regioselective CH bond activation and more: A combined mass spectrometric/computational study on the reactions of “bare” [P4O10].+ with ethane and propane permits insight into mechanistic aspects of both homo- and heterolytic CH bond activations (see picture).
Bi 1.1 Sr x Fe 0.9 Zn 0.1 O 3 ( x =0.05,0.1) (BSFZO), Bi 1.1 Sr x Fe 0.9 O 3 ( x =0.05,0.1) (BSFO), and Bi 1.1 Fe 0.9 Zn 0.1 O 3 (BFZO) thin films have been prepared on Pt/TiO 2 /SiO 2 /Si substrates by pulsed laser deposition, and their ferroelectric and ferromagnetic properties have been characterized. X-ray diffrac…
Novel walnut-like multihollow polymer particles were first prepared by gamma-ray radiation emulsion polymerization using cross-linked and sulfonated polystyrene spheres (CSPs) as the template. The formation process was studied in detail, and the morphology of walnut-like multihollow polystyrene particles could be cont…
A series of amphiphilic poly(L-leucine)-block-poly(ethylene glycol)-block-poly(L-leucine) (PLL-PEG-PLL) hybrid triblock copolymers have been synthesized. All the blocks in this system have good biocompatibility and low toxicity. The PLL-PEG-PLL copolymers could self-assemble into micelles with PLL blocks as the hydrop…
We have investigated the changes in crossed polariser optical textures produced by adsorption and UV polymerisation of a range of polymerisable surfactants at the interface between a nematic liquid crystal and water. Similar to non-polymerisable surfactants, the adsorption of polymerisable surfactants with sufficientl…
Homocitrate synthase (HCS) catalyzes the first and committed step in lysine biosynthesis in many fungi and certain Archaea and is a potential target for antifungal drugs. Here we report the crystal structure of the HCS apoenzyme from Schizosaccharomyces pombe and two distinct structures of the enzyme in complex with t…
Pendry's perfect lens has spurred intense interest for its practical realization at visible frequencies. However, fabrication of low-loss isotropic left-handed metamaterials is a current challenge. In this work, we theoretically show that under specific conditions anisotropic metamaterial slabs can emulate Pendry's pe…
Ceroxid wächst auf einem Kupfersubstrat unter Bildung kleiner Inseln auf den Terrassen (2–5 nm, CeOx-I) und großer Inseln auf den Stufen (30–50 nm, CeOx-II; siehe Bild; 100×100 nm2). Die CeOx/ Cu(111)-Systeme wirken außerordentlich stark auf des Wassergas-Gleichgewicht und demonstrieren, dass Oxide die Leistungsfähigk…
${\text{CuCrS}}_{2}$ is a triangular lattice Heisenberg antiferromagnet with a rhombohedral crystal structure. We report on neutron and synchrotron powder diffraction results which reveal a monoclinic lattice distortion at the magnetic transition and verify a magnetoelastic coupling. ${\text{CuCrS}}_{2}$ is therefore…
The radio-frequency (RF) electrical response of monolayer graphene is reported. From the measured S -parameter in the range of 10 MHz to 50 GHz, a simple equivalent resistor–inductor–capacitor (R–L–C) circuit is established to analyze frequency impedance. The impedance magnitude shows significant frequency dependence…
A new processing route for high‐performance graded ceramic filters is presented. The direct foaming process is based on the transition of a surfactant‐stabilized alkane dispersion in a stabilized aqueous ceramic powder suspension into mechanically stable ceramic foams with porosities up to 90%. The cell size distribut…
The confinement of functionalized graphene sheets (FGS) in the polystyrene (PS) domains of a nanostructured poly(styrene- b -isoprene- b -styrene) (SIS) block copolymer is reported in this paper. The addition of FGS showed a drastic effect on the nanostructured morphology of the block copolymer (BC) matrix switching f…
Electrostatic self-assembly can be used to form supramolecular vesicles in aqueous solution. Vesicles consist of cationic G8 poly(amidoamine) dendrimers and the trivalent sulfonate dye Ar27. No classical amphiphiles are present but the interplay of electrostatics, π-π interaction and geometric factors influences the s…
By carrying out density functional theory calculations, we studied the CO oxidation promoted by cationic, neutral, and anionic Au trimers, which represent the prototypes of Au-cluster-based catalysts with different charge states. The reaction is explored along three possible pathways: one involves the reaction of the…
We assess heat and mass transfer limitations in in situ studies of model catalysts with a first-principles based multiscale modeling approach that integrates a detailed description of the surface reaction chemistry and the macro-scale flow structures. Using the CO oxidation at RuO 2 (110) as a prototypical example we…
Bimodal fiber meshes with fiber diameters differing by one order of magnitude, are electrospun in a simple one-step process, using a standard single syringe electrospin setup. The nano- and microfiber meshes combine the benefits of nanofibers (cell adhesion, proliferation) with those of microfibers (open structure, la…