Materials Literature
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A novel pentadecatungstate, [H 6Ce 2(H 2O)Cl(W 5O 18) 3] (7-) ( 1), constructed by a dinuclear cerium unit and 15-member ring WO 6 units was prepared and characterized by single-crystal X-ray diffraction. Polyanion 1 exhibits blue photoluminescence with an emission maximum at 488 nm, which is characteristic of cerium(…
Modifications of the quantum dot (QD) surface are routinely performed via covalent biomolecule attachment, and poly(ethylene glycol) (PEG) derivatization has previously been shown to limit nonspecific cellular interactions of QD probes. Attempts to functionalize ampiphilic QDs (AMP-QDs) with custom PEG derivatives hav…
A small-angle light scattering (SALS) instrument with a high resolution at low angles and a high signal-to-noise ratio has been developed. Both a wide dynamic range and a wide scattering vector range are achieved using a two-dimensional array of complementary metal oxide semiconductor image sensors. These instrument c…
We describe the new nanostructured Pt/Ge/Se materials prepared from the molecular units [Ge2Se6](4-) and [GeSe4](4-) and linking Pt(2+) ions in the presence of surfactant micelles. X-ray diffraction coupled with transmission electron microscopy images reveals hexagonal pore symmetry. The solvent dependence and solutio…
Nanostructured ZnO thin films have been grown on quartz substrates by metal organic chemical vapor deposition. Zn(tta) 2 •tmeda (H-tta = 2-thenoyltrifluoroacetone, tmeda = N, N, N ′, N ′-tetramethylethylenediamine) has been used as Zn precursor. The impact of deposition temperature, in the range 400−750 °C, on film na…
Gold oxide cluster cations, containing one to four gold atoms and between one and five oxygen atoms, were investigated employing guided-ion-beam mass spectrometry to gain insight into their reactivity with CO. Clusters with one atomically bound oxygen atom (AuO +, Au 2 O +, and Au 3 O + ) were found to be reactive and…
The large-size domain and continuous para-sexiphenyl (p-6P) ultrathin film was fabricated successfully on silicon dioxide (SiO2) substrate and investigated by atomic force microscopy and selected area electron diffraction. At the optimal substrate temperature of 180 degrees C, the first-layer film exhibits the mode of…
Due to their tunable optical properties and their well-defined nanometric size, core/shell nanocrystals (quantum dots, QDs) are extensively used for the design of biomarkers as well as for the preparation of nanostructured hybrid materials. It is thus of great interest to understand their interaction with soft lipidic…
Unsymmetrical 1-(arylimino)-3-(2-hetarylimino)isoindolines have been prepared from 1,3-diiminoisoindoline, an arylamine (aniline, 2-methylaniline, 2-iodoaniline), and a heteroaromatic amine (2-amino-6-methylpyridine, 2-amino-4-methylthiazole) in a stepwise manner by two consecutive condensations. The metalation reacti…
The Coats and Redfern method for the determination of the activation energy has been extensively used in the kinetic analysis of thermal decomposition of coal and biomass. The relative errors involved in the apparent activation energy obtained from the Coats and Redfern method have been calculated by some researchers.…
Nanowire arrays of cubic zinc sulfide are synthesized on zinc foil by a simple thermal evaporation route at relatively low temperature (<500 °C). A self-catalytic liquid–solid growth is proposed for the formation of the nanowires. Influence of the synthesis temperatures on the morphological features of the ZnS nanowir…
Bridging the catalyst: The dimeric complex [(μ-oxo){Nb(salan)}2] catalyzes asymmetric epoxidation of allylic alcohols by hydrogen peroxide to give epoxy alcohols with good to high enantioselectivities irrespective of the olefin geometry (see scheme).
The elasticity of spider MAA silks containing varying proline content was investigated and compared with that of silkworm ( Bombyx mori) silk. For silks with similar breaking strain (suggesting similar molecular order), the elasticity appears to increase with increasing proline content. Particularly, across all spider…
Abstract In this paper we present lattice constant values for cubic perovskite solids with the product of ionic charges and average ionic radii r av (Å). The lattice constant of these compounds exhibit a linear relationship when plotted on a log–log scale against the average ionic radii r av (Å), but fall on different…
The amino poly(trimethylene carbonate)-NHt-Boc (PTMC-NHt-Boc) and poly(epsilon-caprolactone)-NH -Boc (PCL-NHt-Boc) were synthesized by ring-opening polymerization (ROP) of TMC or CL and subsequently deprotected into the corresponding PTMC-NH2 and PCL-NH2. These functional homopolymers were used as macroinitiators for…
The thermal decomposition of manganese dihydrogenphosphate dihydrate Mn(H 2 PO 4 ) 2 ·2H 2 O was investigated in air using differential thermal analysis-thermogravimetry. Mn(H 2 PO 4 ) 2 ·2H 2 O decomposes in two steps and the final decomposition product (Mn 2 P 4 O 12 ) was studied by X-ray powder diffraction and FT-…
The magnetic properties of Co(N 3) 2(4acpy) 2 have been thoroughly reexamined on both powder and well-oriented single crystal samples. This azido-bridged cobalt compound of (4, 4) layer shows a weak-ferromagnetic state below T C = 11.2 K. The magnetic axes were determined to be along the crystallographic a*, b, and c…
Diatoms are a species-rich group of photosynthetic eukaryotes, with enormous ecological significance and great potential for biotechnology. During the last decade, diatoms have begun to be studied intensively using modern molecular techniques and the genomes of four diatoms have been wholly or partially sequenced. Alt…
The solution behavior of a model compound, tetrolic acid (TTA), is studied via molecular dynamics simulations in four organic solvents. The results suggest that strong interactions between TTA and solvent molecules (ethanol or dioxane) prevent the formation of carboxylic acid dimers in solution and thus promote the cr…
Microstructure evolution of a low hard segment (<10 mol %) thermoplastic polyurethane (LHS-TPU) has been followed by in-situ wide-angle X-ray (WAX) and small-angle X-ray scattering (SAX) with a focus on elucidating peculiar microstructural changes during uniaxial deformation (λ = 1−3.5). For the LHS-TPU, the hard segm…