Materials Literature
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ZnS powders with primary crystallite sizes of only a few nanometers were prepared by three different synthesis routes at temperatures below 130 degrees C. The reaction of zinc acetate dihydrate with thioacetamide (TAA) in the presence of pyridine and triphenylphosphite (TPP) was carried out using either conventional h…
Phase diagrams of the binary mixtures of the title compounds were constructed to investigate the effect of different polar substituents, on the pyridine-based derivatives, as well as the alkoxy-chain length, on the acids, on the extent and stability of the supramolecular liquid crystal phases induced by intermolecular…
Chemical vapor deposition of carbon nanotubes (CNTs) in a horizontal tube-flow reactor has been investigated with a fully coupled reactor-scale computational model. The model combined conservation of mass, momentum, and energy equations with gas-phase and surface chemical reactions to describe the evolution of a hydro…
OBJECTIVE: Infection at time of MR contrast administration has been reported to predispose patients with renal failure to development of nephrogenic systemic fibrosis (NSF). We assessed the frequency of infection at the time of MR contrast administration in a group of NSF patients. MATERIALS AND METHODS: Eight patient…
Stepwise acetylenic scaffolding provides cruciform-conjugated molecules with vertically disposed pi-systems, one being an extended tetrathiafulvene (TTF) unit. Two synthetic routes for a cruciform dimer incorporating a total of two extended TTFs was developed, employing either an oxidative Hay coupling reaction as the…
Surkhobite, a new mineral related to the members of the jinshajiangite-perraultite series, was approved in 2002 (IMA No. 2002-037) and later discredited (IMA decision 06-E). It is redefined here with a new formula and revalidated with the original name (IMA 07-A). It occurs as platy crystals up to 1 mm and grains up t…
Viewing angle control of a patterned vertical alignment (PVA) liquid crystal display using only one panel is investigated. In conventional PVA modes, a vertically aligned liquid crystal (LC) director tilts down in four directions making 45° with respect to crossed polarizers to exhibit a wide viewing angle. In the vie…
Supramolecular synthesis emerged recently as a new formalism to devise complex architectures held through noncovalent forces. Much of the research endeavor has been devoted to the use of H-bonds as the alphabet for chemical information encoding, and the structures expressed have spanned the range of dimensions and sha…
Abstract Single crystals of pure and lithium substituted L‐alanine are successfully grown by slow evaporation method at constant temperature of 32°C. The effect of lithium dopant on crystal properties has been studied. Powder and single crystal XRD analysis confirms the structure and change in lattice parameter values…
Fringing-field-induced phase separation dynamics in liquid-crystal-(LC-)monomer mixtures is investigated via a microscope. At a low LC concentration, the fringing field converts the randomly dispersed LC droplets to an ordered droplet array, while at a high LC concentration the fringing field converts the amorphous LC…
The kinetics of the removal of ozone from air by granular activated carbon (GAC) has been investigated. Twenty GACs with different textural and chemical surface properties were used in this study. The kinetic experiments were carried out in an expanded bed reactor (EBR) and in a packed bed reactor (PBR). A rate equati…
We employ dissipative particle dynamics (DPD) to examine the effects of composition and interaction parameter on the resulting phase behavior of ABC star copolymers. Here, we assume that the interaction parameters among the three components are equal. When the three components have comparable volume fractions, our DPD…
Lead-free piezoelectric ceramics (1 − x)(K0.5Na0.5)NbO3–x(Bi0.5Na0.5)TiO3 [(1 − x)KNN–xBNT] were synthesized by conventional solid-state sintering. The phase structure and electrical properties of (1 − x)KNN–xBNT ceramics are investigated. The polymorphic phase transition (from the orthorhombic to the tetragonal phase…
Superhydrophobic Sb(2)O(3) films with micro-nanoscale hierarchical structures have been successfully synthesized for the first time. The resultant materials were characterized in detail by x-ray diffraction, scanning electron microscopy, energy-dispersive x-ray spectroscopy, transmission electron microscopy and water…
A unique modeling approach is introduced, which can track the hysteretic evolution of volume fractions of magnetic moments in several directions and has the potential to predict the magnetomechanical behavior accurately along several important crystallographic directions. The model is benchmarked against the [110] ori…
Desmosomes are cadherin-based intercellular junctions that primarily provide mechanical stability to tissues such as epithelia and cardiac muscle. Desmosomal cadherins, which are Ca(2+)-dependent adhesion molecules, are of central importance in mediating direct intercellular interaction. The close association of these…
Way station. Quinonoid intermediates play a key role in the catalytic mechanism of pyridoxal 5′-phosphate (PLP)-dependent enzymes. Whereas structures of other PLP-bound reaction intermediates have been determined, a high-quality structure of a quinonoid species has not been reported. We present the crystal structure o…
Most ceramic-carbon nanotube (CNT) composite processing utilizes solid state sintering, hence the concept of wetting of CNTs by molten ceramic is absolutely new. In the present work on a plasma sprayed Al(2)O(3)-CNT nanocomposite, it is observed that molten Al(2)O(3) spreads uniformly on the CNT surface by forming a t…
Low-frequency noise measurements on individual single-walled carbon nanotube transistors exhibiting ambipolar characteristics have been carried out. With a polymer electrolyte as gate medium, low-frequency noise can be monitored in both p- and n-channel operation of the same nanotube under the same chemical environmen…
A combination of X-ray, neutron and electron diffraction, and high-resolution electron microscopy have been used to establish the 5H structural type of a new hexagonal-type perovskite BaMn 0.2 Co 0.8 O 2.80 . The structure can be described as a (cc′chh) 5H hexagonal polytype with ordered oxygen vacancies where the cub…