Materials Literature
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A trimethylsilyl (SiMe(3)) group is the basis of a strategy that emulates the three fundamental proposed processes in ladder polyether biosynthesis: chain homologation, stereoselective epoxidation (>95% ee or >95:5 dr), and endo-selective, stereospecific (inversion) hydroxyepoxide cyclization (>95:5 endo:exo, >95% dr)…
Iron-rich and highly ordered 2D-hexagonal mesoporous ferrisilicates containing predominantly tetrahedrally coordinated Fe 3+ in the silica network have been prepared using cetyltrimethylammonium bromide (CTAB) as the structure-directing agent (SDA) under mild alkaline hydrothermal conditions (initial pH = 8−8.5 in the…
The field of applications of polyelectrolyte complexes ranges from large-scale industrial products up to special uses in biotechnology and medicine. An important problem is their stability against environmental conditions, particularly the presence of different salts, that is, the colloidal stability as well as the st…
A tridentate Schiff base carboxylate ligand, derived from the condensation of pyridine 2-carboxaldehyde with anthranilic acid, reacts with copper trifluoroacetate salt to give rise to the helical chain complex [Cu(C(13)H(9)N(2)O(2))(F(3)CCO(2))](n)() (1) and with copper nitrate to give rise to the tetranuclear complex…
Pure (unstabilized) zirconia nanoparticles in the fluorite-type cubic phase are observed by transmission electron microscopy. Microscopic observations at a pressure of 5 × 10 -5 Pa suggest that the phase transition from the cubic to tetragonal phase arises for particles near 2 nm in diameter. First principles computer…
In this report, we show controlled in-situ doping of a single crystalline metal oxide nanowire, using indium-doped tin oxide (In−SnO 2 ) as an example, during a heteroepitaxial growth process. Highly regular and high-density arrays of In−SnO 2 nanowires, which demonstrate three- and four-fold growth symmetry, are obta…
Films and arrays of 200 and 50 nm diameter wires of Bi 2 Te 3 - x Se x have been electrodeposited in the following general reaction: 2Bi 3+ + (3− y )HTeO 2 + + ( y )H 2 SeO 3 + (9+ y )H + + 18e - → Bi 2 Te 3 - y Se y + (6+ y )H 2 O. Films produced from an electrolyte of 0.0075 M Bi, 0.0090 M Te, and 0.0010 M Se in 1 M…
Talc has been known to nucleate poly(ethylene terephthalate) (PET) for a long time, but the exact nucleation mechanism involved had remained unknown. This study presents evidence of an epitaxial relationship between the polymer and the inorganic substrate. Electron diffraction results suggest a contact between the (10…
A photoswitchable double-shell structure on Au nanoparticles, consisting of photochromic spiropyran as the first shell, which regulates the assembly and release of an outer shell of amino acid derivatives upon irradiation, is being reported for the first time. The light-regulated changes in the topographic properties…
Computer simulations of double-walled carbon nanotubes show that if the inner nanotube is pulled out part of the way and then released, then the inner tube exhibits damped oscillatory behavior at gigahertz frequencies. A simple mathematical model, formulated in terms of macroscopic ideas of friction, is shown to predi…
The oxidation of CO at MgO supported gold aggregates is studied by means of density functional theory calculations. In addition to serving as a structural promoter holding the gold particles, the supporting oxide also takes an active role in the bonding and activation of adsorbates bound to the gold. The oxide stabili…
We describe a new approach to peptide-amphiphile (PA) nanofiber preparation that allows PAs with different bioactive amino acid sequences to be combined into a single fiber. Oppositely charged PAs are synthesized separately and then mixed to produce gels of nanofiber networks at physiological pH. Transmission electron…
Nanoparticles provide key tools for bridging the gap between "bottom-up" synthetic methods and "top-down" fabrication. In this Account we describe some of the unique structural aspects of nanoparticles and the use of these attributes to the creation of devices with tunable specificity and environmental response. We al…
Substituted nitrobenzene, a toxic series of molecules with its wide application in pesticides needs to be removed by a suitable sorbent, whose characteristic is to be determined using the reactivity index theory within the helm of the density-functional theory and as well inside the broad subject range of the hard–sof…
Abstract Carbon‐11 labelled befloxatone ((5R)‐5‐(methoxymethyl)‐3‐[4‐[(3R)‐4,4,4‐trifluoro‐3‐hydroxybutoxy]phenyl]‐2‐oxazolidinone) is a reversible and selective monoamine oxidase‐A (MAO‐A) inhibitor and appears to be a new potent PET tracer for the in vivo imaging of MAO‐A density. In this paper, the radiosynthesis o…
The phase diagram of solutions of semiflexible macromolecules consisting of N=20 effective monomer units has been studied by means of grand canonical Monte Carlo computer simulation using the bond fluctuation model and the configurational bias scheme. Two different types of interactions were taken into account: an int…
The heterogeneity in segmental chain order of grafted polymers was investigated by 1 H multiple-quantum NMR. The measurements were performed on a series of samples of poly(dimethylsiloxane) (PDMS) layers chemically attached to the surface of hydrophilic silica. These grafted PDMS layers consist of partially immobilize…
Epitaxial Nd2Fe14B films with the c axis (easy magnetization axis) perpendicular to the film plane were prepared on a Ta(110) buffer on single crystalline Al2O3(0001) substrates using pulsed laser deposition. Due to the epitaxial film growth an almost perfect alignment of all magnetic moments perpendicular to the film…
We use molecular dynamics to investigate the instantaneous structure of a fourth generation (dansyl terminated) dendrimer of propylene amine dissolved in CH(2)Cl(2), and of the same system upon the subsequent encapsulation of several eosin Y dyes. Calculations, in a cubic box with up to approximately 3500 solvent mole…
A wafer bending method has been devised to impose biaxial strains on Pb(Zr0.35Ti0.65)O3 (PZT) thin films ranging in thickness from 700 to 4000 Å grown by metal-organic chemical vapor deposition. The ferroelectric and dielectric properties of PZT capacitors were investigated while the film was placed under biaxial tens…