Materials Literature
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The results of fabrication and performance of an ionization vacuum gauge using a carbon nanotube electron source are presented. The electron source was constructed with multiwall nanotubes, which were grown using thermal chemical vapor deposition. The electron emission of the source was stable in vacuum pressure up to…
Tactics with taci: Strong ferromagnetic interactions (up to ≈150 cm−1) and an S=3 ground state have been observed in the octanuclear vanadyl cluster [V8O14(H−2taci)2] (taci=1,3,5-triamino-1,3,5-trideoxy-cis-inositol; see structure: V yellow, O red, N blue, C black) where the polydentate taci ligand forces some of the…
Imperfect oriented attachment of nanoparticles over specific surfaces is rationalized to cause accretion and defects for the rutile condensates. Analytical electron microscopy indicates that rutile nanoparticles prepared by Nd:YAG laser ablation on Ti targets have well-developed {110} and {011} surfaces with steps. Th…
Photoinduced charge-separation (CS) and recombination (CR) processes of porphyrin (H 2 P)-oligothiophene ( n T)-fullerene (C 60 ) linked triads (H 2 P- n T-C 60, n = 4, 8, and 12), which were designed to reveal the function of n T as a molecular wire for the electron-transfer (ET) process, have been investigated by ti…
Transient and spectral photovoltage (PV) have been investigated for charge injection from a dye [Ru(dcbpyH2)2(NCS)2] into transparent hole (CuSCN, CuI, CuAlO2) and electron (TiO2, SnO2:F) conductors. The PV signal rises to a maximum within 10ns to 10μs, depending on the transparent hole or electron conductor and on th…
We provide exact results for the Laplace-transformed partition function of a wormlike chain subject to a tensile force and in a nematic field, in both two and three dimensions. The results are in the form of infinite continued fractions, which are obtained by exploiting the hierarchical structure of a moment-based exp…
The successive ionic layer adsorption and reaction method was used to deposit CdSe thin films on glass substrates at room temperature (300 K). The films were characterized by x-ray diffraction, energy dispersive x-ray analysis, scanning electron microscopy, atomic force microscopy and high-resolution transmission elec…
The thermal expansion behavior of polystyrene $(\mathrm{PS})$ thin films was investigated using x-ray reflectivity, focusing on ultrathin films below $10\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. It was found that the glass transition temperature ${T}_{\mathrm{g}}$ decreases with thickness as reported by many researcher…
Abstract Nanocomposites based on poly(hydroxybutyrate‐ co ‐hydroxyvalerate) (PHBV) and multi‐walled carbon nanotubes (MWNTs) were prepared by solution processing. Ultrasonic energy was used to uniformly disperse MWNTs in solutions and to incorporate them into composites. Microscopic observation reveals that polymer‐co…
A “peelable banana” is formed when a bent-core molecule is linked to a rodlike mesogen through a flexible aliphatic spacer. This is an appropriate description of this novel low-molar-mass organic system, which displays a transition from a biaxial nematic (Nb) phase to a biaxial smectic A phase. The illustration gives…
Wheel meet again: The titanium(IV) substituted [{β-Ti2SiW10O39}4]24− (1) consists of four β-Keggin moieties that are linked via Ti-O-Ti bonds leading to a cyclic arrangement (see picture; red WO6, green TiO6, and blue SiO4). The wheels stack to give a tunnel-like structure. Synthesis of 1 is from the dilacunary precur…
To develop a good host material for red phosphors as well as a model for clarifying the underlying correlation between structure and properties, tetragonal phased LaVO4:Eu was synthesized via an ethylenediamine tetra-acetic acid (EDTA) assisted hydrothermal method. The challenging transformation from monazite to the m…
Using event-driven molecular dynamics simulations, we study a three-dimensional one-component system of spherical particles interacting via a discontinuous potential combining a repulsive square soft core and an attractive square well. In the case of a narrow attractive well, it has been shown that this potential has…
Many crystallographic protein structures are being determined using molecular replacement (MR), a model-based phasing method that has become increasingly important with the steady growth of the PDB. While there are several highly automated software packages for MR, the methods for preparing optimal search models for M…
The monomeric D-glucose/D-galactose-binding protein (GGBP) from Escherichia coli (M(r) 33000) is a periplasmic protein that serves as a high-affinity receptor for the active transport and chemotaxis towards both sugars. The effect of D-glucose binding on the thermal unfolding of the GGBP protein at pH 7.0 has been mea…
Small-angle X-ray scattering and size-exclusion chromatography have been combined within a unified experimental set-up to obtain molecular size information. Besides providing simultaneous corroborative data bearing on the same question from two distinct experimental techniques, passing the samples over a gel filtratio…
Abstract The kinetics of magnesia hydration to produce magnesium hydroxide is crucial for process design and control, and for the production of an Mg(OH) 2 powder with desirable particle morphology. In this study, highly pure magnesia has been hydrated in a batch reactor. The effects of the following variables were ev…
The synchrotron powder diffraction beamline B2 at HASYLAB/DESY is described. The beamline is capable of high-resolution powder diffraction as well as time-resolved studies and offers several sophisticated ancillary equipments for special applications. A newly developed image-plate system allows for kinetic studies wit…
The stability and bonding of the ternary complex K$_2$PtCl$_6$ structure hydrides is discussed using first principles density functional calculations. The cohesion is dominated by ionic contributions, but ligand field effects are important, and are responsible for the 18-electron rule. Similarities to oxides are discu…
Structural and superconducting properties of magnesium diboride thin films grown by pulsed laser deposition on zirconium diboride buffer layers were studied. We demonstrate that the ZrB2 layer is compatible with the MgB2 two step deposition process. Synchrotron radiation measurements, in particular anomalous diffracti…