Materials Literature
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We have carried out resonant x-ray scattering experiments on ${\mathrm{NdNiO}}_{3}$ single crystals aiming at the observation of a predicted orbital ordering that may explain the presence of an antiferromagnetic ordering with unusual modulation wave vector, $q=(\frac{1}{2},0,\frac{1}{2})$. A first-order structural pha…
We investigated the effect of various aluminum sources on the morphology and microstructure of nanoporous Al-SBA-15. With aluminum tri-sec-butoxide (Al-TSB), very large, ordered hexagonal rods of Al-SBA-15 covered by nanostairs and terraces were synthesized. Such a morphology was not obtained with an inorganic Al sour…
The three-dimensional (3D) accessible pore structures (Imm space groups) of continuous mesoporous silica SBA-16 thin films have been prepared by a dip-coating technique in nonaqueous media under acidic conditions on indium-tin oxide glass (ITO). The films are oriented with the (111) crystal plane perpendicular to the…
We present a statistical study of silicon and oxygen neutral defects in a silica glass model. This work is performed following two complementary approaches: first-principles calculations and empirical potential molecular dynamics. We show that the defect formation energies and structures are distributed and that the e…
A series of benzophenone (BP) and norbornadiene (NBD)-labeled poly(aryl ether) dendrimers (Gn-NBD), generations 1-4, were synthesized, and their photophysical and photochemical properties were examined. The phosphorescence of the peripheral BP (donor) chromophore was efficiently quenched by the NBD (acceptor) group at…
Following a combinatorial library approach, 60 organic salts have been prepared by reacting 5 bile acids and 12 secondary amines. Gelation tests with various organic and aqueous solvents reveal that 16 salts are supramolecular gelators of which 6 salts are found to be ambidextrous displaying the ability to form gels w…
Aus alt mach neu: Eine neuartige Methode zur katalytischen Verbrennung von Polypropylen liefert hohe Ausbeuten an mehrwandigen Kohlenstoffnanoröhren (MWNTs, siehe Rasterelektronenmikroskopie-Bild) in Gegenwart eines mit organischen Gruppen modifizierten Tones und eines immobilisierten Nickelkatalysators. Der umweltver…
We present a growth technique which combines wet-chemical growth and molecular beam epitaxy (MBE) to create complex semiconductor nanostructures with nanocrystals as active optical material. The obtained results show that wet-chemically prepared semiconductor nanocrystals can be incorporated in an epitaxally grown cry…
Freestanding Ge nanocrystals that are stable under ambient conditions have been synthesized in a two-step process. First, nanocrystals with a mean diameter of 5nm are grown in amorphous SiO2 by ion implantation followed by thermal annealing. The oxide matrix is then removed by selective etching in diluted HF to obtain…
Synthesis, characterizations, and photophysical properties of new photoactive dyads and triads containing perylenetetracarboxylic diimide (PIm) and porphyrin (free-base porphyrin (H(2)P) and zinc porphyrin (ZnP)), in which both entities were connected with a short ether bond, were examined with the aim of using these…
This communication describes a new synthetic approach to one- (1D) and two-dimensional (2D) NbSe2 nanoscale materials using soft chemical methods. Our one-pot synthesis provides a direct route to control the morphology of nanostructures that can exhibit complex electronic properties, and can produce layered, nanocryst…
The recent observation of pyroelectricity in quasiamorphous thin films of $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ introduced a previously unreported type of polar ionic solid where the appearance of a macroscopic dipole moment is not accompanied by long-range crystal-like order. This poses a question regarding the me…
Bacillus subtilis gene products TenA and TenI have been implicated in regulating the production of extracellular proteases, but their role in the regulation process remains unclear. The structural characterization of these proteins was undertaken to help provide insight into their function. We have determined the stru…
In this study we demonstrate that one-dimensional (1D) nanostructured lead telluride (PbTe) can be synthesized in a hydrothermal reaction between lead foil and tellurium powder. The resulting materials were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The form…
Polyelectrolyte multilayer (PE) deposition and S-layer technology have been combined to make novel robust biomimetic surfaces and membranes. Isolated subunits of the bacterial cell surface layer from Bacillus sphaericus CCM2177 SbpA was self-assembled on PE multilayer supports, with the composition of the multilayer p…
Epitaxial cuprous oxide nanostructures with high aspect ratio were deposited electrochemically on n-InP(111) from aqueous solution at room temperature. High-resolution X-ray diffraction shows that the Cu 2 O and InP form three equivalent epitaxial orientation relationships that are rotated 120° relative to each other:…
Two-dimensional computational fluid dynamics (CFD) simulations are used to study spatially segregated, multifunctional, microchemical devices for hydrogen production. In particular, coupling between homogeneous propane combustion and catalytic ammonia decomposition on a Ru catalyst is studied in a microdevice consisti…
Highly ordered 3D mesostructures of ceria have been obtained by a block-copolymer-assisted assembly of near-monodisperse, highly crystalline ceria nanoparticle sols. The preformed ceria nanoparticles have a diameter of ≈3 nm and are stable in solution without any organic functionalization. The mesoporous materials wer…
The field-emission properties of tungsten oxide nanorods have been shown to depend on phase structure. For example, the turn-on field of WO2.9 nanorods could be as low as 1.2 V μm−1, while that of WO2 nanorods (see picture) was above 7 V μm−1. Thus, the field-emission properties can be tuned by rational control of the…
Incompletely condensed, fluorinated polyhedral oligomeric silsesquioxane with the highly reactive group of trisodium silanolate was used for the synthesis of an initiator for atom transfer radical polymerization. The initiator was applied to solution polymerization of methyl methacrylate (MMA) in the presence of a cop…