Materials Literature
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Self-assembled systems with polyamidoamine (PAMAM) dendrimers combined with gold nanoparticles have been widely studied because of their potential applications in molecular electronics, catalyst carriers, chemical sensors, and biomedical devices. In our work, gold nanoparticle monolayers and multilayers with pure and…
NAD(+)-dependent glycerol-3-phosphate dehydrogenase (G3PDH) is generally absent in archaea, because archaea, unlike eukaryotes and eubacteria, utilize glycerol-1-phosphate instead of glycerol-3-phosphate for the biosynthesis of membrane lipids. Surprisingly, the genome of the hyperthermophilic archaeon Archaeoglobus f…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMatched Random Ionomers: Carboxylate vs SulfonateNeena K. Tierney, Scott T. Trzaska, and Richard A. RegisterView Author Information Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544 Cite this: Macromolecules 2004, 37, 26, 10205–10207Publicati…
The electronic structure and residual resistivity of diluted (Ga, Mn)As magnetic semiconductors are calculated from first principles using the linear muffin-tin orbital method, the coherent potential approximation, and the Kubo–Greenwood linear response theory. Particular attention is paid to the role of native compen…
Hydrogenated amorphous silicon carbide (a-Si 1− x C x : H) films with different carbon concentrations have been deposited using the helicon wave plasma-enhanced chemical vapour deposition technique under the condition of strong hydrogen dilution. The a-Si 1− x C x :H films with carbon content x up to 0.64 have been de…
A series of copolymers was prepared by ring-opening polymerization of ε-caprolactone and ( R, S )-β-butyrolactone using zinc lactate as catalyst. The resulting PCL/PBL copolymers were characterized by various analytical techniques such as NMR, SEC, DSC, and X-ray diffraction. The CL/BL ratio was higher in the copolyme…
The influence of intrinsic defects in half-metals is calculated in the case of NiMnSb. Of the 14 cases of intrinsic defects, five affect the half-metallic properties. They are energetically very unlikely to occur. Circumstances are discussed under which defects may even have a beneficial effect on the spin polarizatio…
Thermoelectric material Bi 1 - x Sb x nanowire arrays have been successfully synthesized by pulsed electrochemical deposition from aqueous solutions into porous anodic alumina membranes. X-ray diffraction results show that the as-synthesized nanowires are single-crystalline and have a highly preferential orientation.…
The electronic structure, magnetic and electric properties, and lattice stability of multiferroic BiMnO 3 as a typical system in perovskite Bi transition-metal oxides (BiMO 3 ) are studied from first principles. It is demonstrated theoretically for the first time that the orbital ordering within the Mn e g orbitals is…
Two new complexes, [BrBzPy]2[Ni(tdas)2] (1) and [BrFBzPy]2[Ni(tdas)2] (2), have been prepared by reaction of disodium 1,2,5-thiadiazole-3,4-dithiolate (Na2tdas), NiCl2·6H2O and 1-(4′-bromobenzyl) pyridinium bromide (BrBzPyBr) or 1-(4′-bromo-2′-fluorobenzyl)pyridinium) bromide (BrFBzPyBr). Crystallographic data for 1:…
Edge effects on possible magnetism appearing in finite hydrogenated zigzag nanotubes are investigated using the DFT–LSDA calculations. Our result shows that two types of edges, i.e. a mono-hydrogenated zigzag edge (MHZE) and a di-hydrogenated zigzag edge (DHZE), can give magnetic moments in finite nanotubes. Due to cu…
Structural properties of GaN layers doped with magnetic impurities (Mn, Cr) were investigated by Raman scattering. In the case of Mn-doping, an impurity mode was observed at around 585 cm−1 with concentrations of Mn up to 1–2%. This mode was assigned to a local vibrational mode of Mn substituting the Ga site, and inte…
cis,trans -1,3,5-Trihydroxy-1,3,5-triisopropylcyclotrisiloxane was prepared as the first example of a cyclotrisiloxanetriol stabilized by relatively small substituents. A new synthetic pathway including dearylchlorination and subsequent hydrolysis of each stereoisomer of the cyclotrisiloxanes [Ar( i -Pr)SiO] 3 (Ar = P…
The S-UNIFAC model of Spiliotis and Tassios ( Fluid Phase Equilib. 2000, 173, 39), developed for systems containing sugars, is modified here by replacing the LLE-UNIFAC model with the modified UNIFAC model of Larsen et al. ( Ind. Eng. Chem. Res . 1987, 26, 2274). This modification was motivated after an extensive eval…
We discuss an application of the self-interaction-corrected local spin density (SIC-LSD) approximation to study electronic structure of some half-metallic ferromagnets and ferromagnetic insulators of current interest in spintronics. Both d- and f-electron materials are considered, and we concentrate on the nominal val…
[structure: see text] A lanthanide luminescent probe that was functionalized with quinoline-alkylated diaza-18-crown-6 showed dual-component recognition of concentrations of H+ and K+ at four independent pH ranges, including in the physiological pH window. Moreover, it exhibited pH- and [K+]-independent long-lived lan…
Previous studies, e.g., by NMR, 1,2 fluorescence photobleaching, 3 and dynamic light scattering (DLS), 4,5 have shown that the diffusion of noninteracting probe particles in polymer solutions and gels primarily depends
ADVERTISEMENT RETURN TO ISSUEPREVNoteHydrogen-Bonding-Directed Layer-by-Layer Films: Effect of Electrostatic Interaction on the Microporous Morphology VariationShilong Bai, Zhiqiang Wang, Xi Zhang, and Bin WangView Author Information Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry…
Six new diethynylsilane compounds with the general formula Si(C⋮C−R) 2 R‘ 2 (R = p - N- indolylphenyl, R‘ = Me, 1; R‘ = Ph, 2; R = p - N- 7-azaindolylphenyl, R‘ = Me, 3; R‘ = Ph, 4; R = p- 2,2‘-dipyridylaminophenyl, R‘ = Me, 5; R‘ = Ph, 6 ) have been synthesized and fully characterized. Compounds 1, 2, and 4 have been…
GaN-based magnetic semiconductors are expected to exhibit ferromagnetism even at high temperatures. We have studied the magnetic and optical properties of transition-metal- and rare-earth-doped GaN. GaCrN showed ferromagnetic characteristics at 7–400 K. Clear hysteresis and clear saturation were observed in the magnet…