Materials Literature
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Surface magnetic properties of the pseudomorphic Fe(110) monolayer on a W(110) substrate are investigated from first principles as a function of the substrate thickness (up to eight layers). Analyzing the magnetocrystalline anisotropy energies, we find stable (with respect to the number of substrate layers) in-plane e…
To examine whether catalyst-transfer polycondensation, which affords well-defined polythiophenes, has generality for other conjugated polymers, the synthesis of poly(p-phenylene) (PPP) with various Ni catalysts was investigated. Monomer 1, 1-bromo-4-chloromagnesio-2,5-dihexyloxybenzene, was polymerized with Ni(dppe)Cl…
We have used a suspended carbon nanotube as a frequency mixer to detect its own mechanical motion. A single gate-dependent resonance is observed, which we attribute to the fundamental bending mode vibration of the suspended carbon nanotubes. A continuum model is used to fit the gate dependence of the resonance frequen…
BACKGROUND: Instructions to fabricate mineralized structures with distinct nanoscale architectures, such as seashells and coral and vertebrate skeletons, are encoded in the genomes of a wide variety of animals. In mollusks, the mantle is responsible for the extracellular production of the shell, directing the ordered…
We recently demonstrated that, in gas phase clusters containing aluminum and iodine atoms, an Al(13) cluster behaves like a halogen atom, whereas an Al(14) cluster exhibits properties analogous to an alkaline earth atom. These observations, together with our findings that Al(13)(-) is inert like a rare gas atom, have…
We provide the theoretical framework to understand the phenomenology and statistics of single molecule (SM) signals arising in surface enhanced Raman scattering (SERS) under the presence of so-called electromagnetic hot spots. We show that most characteristics of the SM-SERS phenomenon can be tracked down to the prese…
Abstract Natural fiber‐based thermoplastic composites are generally lower in strength performance compared to thermoset composites. However, they have the advantage of design flexibility and recycling possibilities. Hybridization with small amounts of synthetic fibers makes these natural fiber composites more suitable…
We show that equivalent circuits offer a qualitative and even quantitative simple explanation for the behavior of various types of left-handed (or negative-index) metamaterials. This allows us to optimize design features and parameters while avoiding trial and error simulations or fabrications. In particular, we apply…
Utilizing the coupled piezoelectric and semiconducting dual properties of ZnO, we demonstrate a piezoelectric field effect transistor (PE-FET) that is composed of a ZnO nanowire (NW) (or nanobelt) bridging across two Ohmic contacts, in which the source to drain current is controlled by the bending of the NW. A possibl…
Based on a first-principles approach, we present scaling rules for the band gaps of graphene nanoribbons (GNRs) as a function of their widths. The GNRs considered have either armchair or zigzag shaped edges on both sides with hydrogen passivation. Both varieties of ribbons are shown to have band gaps. This differs fro…
Introduction. Peptidoglycan biosynthesis is initiated with the formation of UDP-N-acetylmuramic acid via the stepwise action of two enzymes, UDP-N-acetylglucosamine enolpyruvyl transferase (MurA) and UDP-N-acetylenolpyruvylglucosamine reductase (MurB), which has proven to be attractive targets for the development of a…
Figure 3(c) and figure 4 given in the above paper for Mg + stoichiometric Zr-based AB2 [Mg + x wt\% Ti0.1Zr0.9Mn0.9V0.1Fe0.5Ni0.5 (x = 5, 15, 25, 30, 35, 40, 50, 60 and 75)] composites are incorrect. These two figures are for Mg + non-stoichiometric Zr-based AB2 [Mg + x wt\% (Ti0.1Zr0.9)1.1Mn0.9V0.1Fe0.5Ni0.5 (x = 5,…
Abstract Summary: In a previous paper ( Macromolecules , 2005 , 38 , 9221), the enthalpy of mixing in poly( DL ‐lactide) /poly(vinyl phenol) blends was directly measured by DSC. The first DSC scan for solution/precipitation blends showed phase separation, but miscibility was observed in the second DSC scan. Hence, mis…
Abstract Summary: Aromatic copolyesters containing bio‐based furanic units in the main chain were obtained by ester‐interchange reaction between poly(ethylene terephthalate) (PET) and poly[ethylene 5,5′‐isopropylidene‐bis(2‐furoate)] (PEF) at high temperatures in the bulk. Various copolyesters were synthesized by usin…
The spin dynamics of plate-shaped nanoparticles of NiO has been studied by inelastic neutron scattering and Mössbauer spectroscopy. A value of the in-plane anisotropy energy constant significantly larger than the bulk value has been measured. The temperature and field dependence of the energy of the antiferromagnetic…
Polyacrylamide (PAM)–silver nanocomposite materials have been synthesized by the reduction of the silver salt in the polyacrylamide matrix. Silver nanoparticles embedded in the polymer matrix, observed through transmission electron microscopy (TEM), suggests attractive polymer–particle interaction. Detailed spectrosco…
Among the various biomaterials available for tissue engineering and therapeutic applications, microbial polyhydroxyalkanoates offer the most diverse range of thermal and mechanical properties. In this study, the biocompatibility of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB); containing 50 mol % of 4-h…
The structural transitions of the pyrochlore, ${\mathrm{Cd}}_{2}{\mathrm{Nb}}_{2}{\mathrm{O}}_{7}$, at pressures up to $32.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ have been investigated by in situ Raman scattering and angle-dispersive x-ray diffraction (ADXRD) methods. The x-ray diffraction results reveal that small…
Gallium oxide nanoparticles embedded in silica matrix with different molar ratios were synthesized by the sol–gel method. Powdered nanocomposite samples were annealed at 400, 500 and 900 °C. The gallium oxide nanoparticles (2–5 nm) crystallized in the β-phase at a very low temperature (∼400 °C) as against the expected…
Energy dispersive EXAFS (EDE) and diffuse reflectance infrared spectroscopy (DRIFTS) are combined synchronously at high time resolution (17 Hz) to probe how NO(g) reacts with gamma-Al(2)O(3) supported, metallic Rh nanoparticles of an average 11 A diameter; a bent nitrosyl species is considered to be the key to the for…