Materials Literature
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Abstract Low‐cost, uniform, and monodisperse spherical particles are desirable for a variety of applications. We report the realization of uniform spherical magnesium oxide with a diameter of 10.5 μm and specific surface area of 140.9 m 2 g –1 resulting from a facile seed‐induced precipitation in the presence of a tra…
A complex light switch: Photoreversible fluorescence modulation was achieved by supramolecular complexation of a guest rhodamine molecule (RhB) with spiropyran-modified cyclodextrin (see picture). Upon UV irradiation, the chromophore within the cyclodextrin cavity can transfer its energy to the spiropyran moiety, whil…
OBJECTIVE: To identify medications and other potential risk factors, in addition to renal dysfunction, for developing gadolinium-induced nephrogenic systemic fibrosis (NSF). DATA SOURCES: Information was obtained from PubMed, International Pharmaceutical Abstracts, Iowa Drug Information Service, and Google Scholar, us…
Three samples of SBA-15 functionalised with -(CH(2))(3)COOH groups have been prepared by co-condensation, starting from solutions of TEOS and 4-(triethoxysilyl)butyronitrile, acting as -(CH(2))(3)COOH precursor, of different molar compositions. Materials were characterised by X-ray diffraction, nitrogen adsorption, an…
In the present work the optical properties of In 2 O 3 nanowires, grown by the vapour transport process, have been investigated by means of photo- (PL) and cathodo-luminescence (CL), applied in the ultraviolet (UV)–visible range. Although In 2 O 3 is expected not to emit light at room temperature, a complex photo-lumi…
Abstract One of the most challenging tasks encountered in developing highly efficient electro‐optic (EO) devices is to find a material system that possesses all desirable properties such as large EO coefficients, good thermal and mechanical stability, and low optical loss. In order to meet this stringent requirement,…
Magnetic field alignment of rod-coil block copolymers is shown to proceed through coupling to the diamagnetic moment of individual rod blocks. Block copolymer self-assembly then leads to alignment of the interfaces perpendicular to the field lines and long range order on a 10 nm lengthscale. This is in contrast to pre…
Superhydrophobic surfaces with a contact angle of about 160° and a tilt angle lower than 4° were fabricated on copper plates via a simple solution-immersion step. Interconnected Cu(OH) 2 nanowires were constructed on the copper surface by immersing copper plates in an aqueous solution of sodium hydroxide and potassium…
Two distinct marine organisms, diatoms and sponges, deposit dissolved silicates to construct highly architectural and species-specific body supports. Several factors such as proteins, long-chain polyamines (LCPAs), or polypeptides modified with LCPAs are known to be involved in this process. The LCPAs contained in the…
The cyanide switch. The bonding of the cyanide ligand of Ni(CN)2⋅n H2O changes dramatically on dehydration to Ni(CN)2, equalizing the NiC and NiN bonds and switching the Ni2+ ion bound to nitrogen from high spin to low spin. Total neutron diffraction studies on Ni(CN)2 provide for the first time accurate structural…
We investigate the two-dimensional flow of a liquid foam around a circular obstacle by measuring all the local fields necessary to describe this flow: velocity, pressure, and bubble deformations and rearrangements. We show how our experimental set-up, a quasi-two-dimensional ‘liquid pool’ system, is adapted to the det…
Uniform NiO, α-Fe2O3, ZnO, CuO and Ga2O3 hollow nanospheres consisting of a shell of closely packed nanoparticles with a shell wall thickness of a few tens of nanometers have been successfully synthesized on a large scale by controlled precipitation of metal cations with urea in the presence of carbonaceous saccharide…
The dielectric properties of metamaterials consisting of periodically arranged metallic nanoparticles of spherical shape are calculated by rigorously solving Maxwell's equations. Effective dielectric functions are obtained by comparing the reflectivity of planar surfaces limiting these materials with Fresnel's formula…
We report highly efficient single photon generation from InGaAs self-assembled quantum dots emitting within a two-dimensional photonic bandgap. A strongly suppressed multiphoton probability is obtained for single quantum dots in bulk GaAs and those emitting into the photonic bandgap. In the latter case, photoluminesce…
Abstract Diatoms are single‐celled micro‐algae that possess an exoskeleton (called frustule) comprised of diverse and highly ordered 3D porous silica structures and that hold considerable promise for biological or biomimetic fabrication of nanostructured materials and devices. We have used, for the first time, a soft…
We investigate the magnetocaloric properties of certain antiferromagnetic spin systems that have already been or very likely can be synthesized as magnetic molecules. It turns out that the special geometric frustration which is present in antiferromagnets that consist of corner-sharing triangles leads to an enhanced m…
Tunneling data on $\mathrm{La_{1.28}Sr_{1.72}Mn_2O_7}$ crystals confirm Coulomb interaction effects through the $\sqrt{\mathrm{E}}$ dependence of the density of states. Importantly, the data and analysis at high energy, E, show a pileup of states: most of the states removed from near the Fermi level are found between…
We present a first principles $\mathrm{LSDA}+\mathrm{U}$ study of the magnetic coupling constants in the spinel magnets $\mathrm{Co}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}$ and $\mathrm{Mn}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}$. Our calculated coupling constants highlight the possible importance of $AA$ interactions in spinel s…
Abstract The present work reports on key factors that influence the degree of order in anodic TiO 2 nanotube layers. We show that the anodization voltage and the Ti purity are of crucial importance for the ideality of self‐organization within the nanotube layers and that repeated anodization can significantly improve…
We present the results of a comparative ab initio study of single-walled SiC, BN, and BeO nanotubes (NTs) in zigzag and armchair configurations. Within density functional theory, we employ self-interaction-corrected pseudopotentials that were shown previously to yield reliable results for both structural and electroni…