Materials Literature
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As a candidate for lead-free piezoelectric materials, (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics have been successfully synthesized via a solid state reaction. In this study, KNN-based ceramics were sintered under atmospheric pressure by adding the newly developed sintering aid (K 5.4 Cu 1.3 Ta 10 O 29 , KCT). The effe…
A newly developed cathode material, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 − δ , was synthesized and characterized. X-ray diffraction results identified it as a cubic perovskite structure. Thermogravimetric results showed that lattice oxygen loss was about 2% in weight between 50 and 1000°C. Thermal expansion coefficient res…
Ceramic materials based on the fluorite structure and its derivatives are important for applications in solid oxide fuel cells, sensors, catalysts, gate dielectrics, thermal barrier coatings, and nuclear waste immobilization. The interplay of oxygen vacancy formation and short and long range ordering of vacancies and…
A cartilage engineering bioreactor has been developed that provides joint-specific kinematics. This study investigated the effect of articular motion on the gene expression of superficial zone protein (SZP) and hyaluronan synthases (HASs) and on the release of SZP and hyaluronan of chondrocytes seeded onto biodegradab…
This article discusses the development of synthetic supramolecular systems derived from hydrogen bond driven base-pairing, with a focus on the self-assembly of individual nucleobase analogues.
The influence of synthesis time and temperature on the properties of SBA-15 is investigated for the samples prepared by using two different silica sources, tetraethylorthosilicate (TEOS) and sodium metasilicate. The samples studied were obtained via two-step synthesis, which involved an initial self-assembly of polyme…
The development of cross sections for the inelastic interaction of low-energy electrons with condensed tissue-like media is best accomplished within the framework of the dielectric theory. In this work we investigate the degree to which various model approximations, used in the above methodology, influence electron si…
Five new materials built from polyoxotungstates and Cu(ii) ions as linkers have been synthesized by hydrothermal reactions from a mixture of sodium tungstate, copper chloride and bipyridine. The value of the initial pH, the nature of the heteroelement (P or Si) and of the ligand (2,2'- and/or 4,4'-bipyridine) permit t…
The formation of porous Ta 2 O 5 on tantalum was investigated in H 2 SO 4 electrolytes containing low concentrations of HF (0.15 wt %). Under optimized electrochemical conditions, porous Ta 2 O 5 consisting of self-assembled pore arrays with single pore diameters of ∼ 20 nm and a pore spacing of ∼ 15 nm forms. The por…
An Au/Fe2O3 catalyst prepared using a two-stage calcination procedure achieves target conversion and selectivity for the competitive oxidation of dilute CO in the presence of moist excess H2 and CO2.
Biology often uses hierarchical self-assembly to produce complex functional structures from smaller components. At each level of this stepwise process, non-covalent interactions bring together the subunits of a lower level of complexity, using the information encoded in their structures. Applying this approach to synt…
Adsorption of serum proteins to the liposomal surface plays a critical role in the clearance of liposomes from the blood circulation. In this review, we will discuss the role of the liposomal opsonins proposed so far in liposome clearance. Additional, related topics that will be addressed are the cell-surface receptor…
Crystallization of DL-alanine by cooling of a supersaturated solution in the presence of a chiral double-hydrophilic block copolymer poly(ethylene glycol)-block-poly(ethylene imine)-S-isobutyric acid (PEG4700-PEI1200-S-iBAc) yields crystal superstructures with an astonishing morphology. Although analysis by light micr…
We investigate the feasibility of all-optical regeneration based on self-phase modulation in single mode As2Se3 chalcogenide fiber. By combining the chalcogenide fiber with a bandpass filter, we achieve a near step-like power transfer function with no pulse distortion. The device is shown to operate with 5.8 ps durati…
A highly fluorescent diarylethene in the closed-ring form was synthesized by the oxidation of 1,2-bis(2-methyl-1-benzothiophene-3-yl)perfluorocyclopentene (BTF6).
Aqueous polyaniline colloids can be readily prepared by purifying polyaniline nanofibers and controlling the pH and self-stabilized via electrostatic repulsions without the need for any chemical modification or steric stabilizer, thus providing a simple and environmentally friendly way to process the conducting polyme…
CASP has now completed a decade of monitoring the state of the art in protein structure prediction. The quality of structure models produced in the latest experiment, CASP6, has been compared with that in earlier CASPs. Significant although modest progress has again been made in the fold recognition regime, and cumula…
Nanoscale structures, such as nanoparticles, nanorods, nanowires, nanocubes, and nanotubes, have attracted extensive synthetic attention as a result of their novel size-dependent properties. Ideally, the net result of nanoscale synthesis is the production of structures that achieve monodispersity, stability, and cryst…
This article highlights our recent achievement on directing nanoparticles to self-assemble at the water/oil interface. We demonstrate that the contact angle of 90° is prerequisite for nanoparticles to localize at the interface, which is determined by the terminal groups of the capping ligands. With this peculiar surfa…
A method of inducing specific polymorph transformations is exemplified with two single-component systems, whereby a given crystal form undergoes conversion when subjected to solid state grinding in the presence of a minor quantity of a certain solvent.