Materials Literature
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A photoswitchable nanomaterial is presented, electrospun organic nanofibers based on 1',3'-dihydro-1',3',3'-trimethyl-6-nitrospiro [2H-1-benzopyran-2,2'-(2H)-indole]. The switching properties of the nanofibers were investigated by studying the evolution of absorbance with different UV exposure times, photoluminescence…
Large-scale orthorhombic V 2 O 5 single-crystalline nanowires with diameters of 60–80 nm and lengths of up to hundreds of micrometers, which is by far the longest reported one-dimensional nanostructure of vanadium oxide fabricated, were synthesized by a template-free mild and direct hydrothermal reaction between VOSO…
We present detailed investigations on the optical properties of PbSe nanocrystals. The absorption spectra of monodisperse, quasispherical nanocrystals exhibit sharp features as a result of distinct optical transitions. To study the size dependence, absorption spectra of nanocrystals ranging from 3.4 to 10.9 nm in diam…
A multifunctional multilayered film containing TiO(2) nanoparticles as contact-active antibacterial agent and nanosilver as a release-active antibacterial agent was fabricated via layer-by-layer assembly. TiO(2) nanoparticles with the anatase crystalline dominant structure were synthesized via a sol-gel method. The QC…
Anderson localization of electron states on graphene lattice with diagonal and off-diagonal (OD) disorders in the absence of magnetic field is investigated by using the standard finite-size scaling analysis. In the presence of diagonal disorder all states are localized as predicted by the scaling theory for two-dimens…
Room-temperature fabrication of an ultimately thin seed layer using 2D oxide nanosheets is demonstrated. Flat nanosheets are tiled to form a highly organized monolayer with a thickness of ca. 1 nm on a glass substrate (see figure). Monolayer films of nanosheets such as Ca2Nb3O10 (2D square lattice) and MnO2 (2D hexago…
The homoditopic ligand 6,6'-[methylenebis(1-methyl-1H-benzimidazole-5,2-diyl)]bis(4-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}pyridine-2-carboxylic acid) (H(2)L(C2)) has been tailored to self-assemble with lanthanide ions (Ln(III)), which results in the formation of neutral bimetallic helicates with the overall composition…
Superposed series of arcs were observed in extracellular matrices of diverse tissues in plants and animals, and also within certain chromosomes. These bow-shaped patterns were shown to originate from oblique sections in a three-dimensional arrangement of fibrils, which was reminiscent of a well-known structure present…
According to common perception, glass has a chemical durability superior to most other materials. Nevertheless, when a piece of glass is exposed to an aqueous solution, corrosion takes place. In the first part of the paper, the different equilibrium‐like states related to glass dissolution are discussed. This refers t…
This paper presents an in-depth analysis of the scattering characteristics of the Cummer–Schurig acoustic cloaking design proposed by Cummer and Schurig (2007 New J. Phys. 9 45). The analysis uses an analytical solution for orthotropic media in conjunction with approximating the radially varying properties by multiple…
A general Ostwald ripening process combined with colloidal soft-matter self-assembly has been developed for coaxing the solid nanoparticle rods into the tubular mesocrystals: self-assembled ZnO microtubules with surface grafting of nanorods, in which the polyelectrolyte is exploited to tailor the forces between the co…
A new mate for vanadate: The platinum(IV)-containing polyoxovanadate [H2PtIVV9O28]5− (1) has been synthesized and structurally characterized (see polyhedral representation). The characterization of polyanion 1 in solution by 195Pt NMR spectroscopy is unprecedented in POM chemistry. The facile synthetic procedure with…
Semiconductor single crystalline NiO nanosheets with well-defined hexagonal holes having the appearance of a nanometer-scale spanner are prepared via an efficient wet chemical route. The main surfaces of the NiO nanosheets are (111) facets and the sizes of both the sheets and the holes can be controlled. The NiO(111)…
Carbazole-based donor-acceptor compounds 1,2-dicyano-trans-1,2-bis-4-(carbazolyl)phenylethylene (1) and 1,2-dicyano-trans-1,2-bis-4-(3,6-di-tert-butylcarbazolyl)phenylethylene (2) were synthesized. 1 and 2 show negative solvatochromic absorption behavior, but show both positive and negative solvatochromic behavior in…
Greater than the sum of its parts: Hydrogen storage in complex hydrides is accelerated by using the ternary composite 2 LiNH2/LiBH4/MgH2, which exhibits a “self-catalyzing” reaction pathway that results in faster H2 desorption, lower desorption temperatures, and suppression of NH3 release in comparison to the constitu…
Lanthanide β-diketonate complexes are found to exhibit a smectic A and a nematic phase over a broad temperature range. Polarized luminescence is observed for the europium(III) complex dissolved in the nematic liquid-crystal mixture E7 and for the aligned vitrified mesophase.
Polycrystalline samples and submillimeter size single crystals of Na-doped Ca2CuO2Cl2 have been synthesized under high pressure. A series of experiments showed that the Na content depends not only on the pressure during the synthesis but also on the synthesis temperature and time. From a comparison of the Na-CCOC data…
We study the effects of a partial substitution of Ba with the smaller cation Ca in the layered cobaltites $\mathrm{Y}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\delta}}$ for $\ensuremath{\delta}\ensuremath{\approx}0.5$. Neutron thermodiffractograms are reported for the compounds $\mathrm{Y}{\mathrm{Ba}}_{…
Superelasticity and shape memory down to the nanometer scale are successfully demonstrated in micro- and nanometer-scale pillars of a Cu-Al-Ni shape memory alloy. Microcompression tests show superelastic behavior with recoverable strains above 5 % during more than 100 cycles. In addition, shape memory behavior with co…
The calculation of electronic properties of materials is an important task of solid state theory, albeit particularly difficult if electronic correlations are strong, for example in transition metals, their oxides and in f-electron systems. The standard approach to material calculations, the density functional theory…