Materials Literature
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A form of hydrogenated diamond-like-carbon, “near-frictionless carbon,” developed at Argonne National Laboratory has been studied by several spectroscopic techniques to determine the hydrogen content and carbon bonding within the film. The techniques used include hydrogen forward scattering, ultraviolet Raman spectros…
We dispersed bulk crystalline Si into identical hydrogenated nanoparticles with negligible impurities and defects, which provide the opportunity for detailed comparison between measurement and theory. The UV photoluminescence of a dispersion of 1 nm silicon particles was studied. Distinct bands appear in the emission…
The possibility to use Mn2+ co-doping to modify the emission properties of Pr3+-based quantum cutting phosphors—i.e., phosphors that emit one UV and one visible photon for each absorbed vacuum UV (VUV) photon—into phosphors that emit two visible photons, was studied experimentally. In this respect a luminescence excit…
Multistage thermoelectric coolers have been used for a long time because they offer a larger temperature difference than single-stage thermoelectric coolers. Microelectromechanical systems technology leads to the possibility to fabricate multistage thermoelectric microcoolers in batches without much increase in comple…
We observed the field electron emission of the technologically useful current density of 10 mA/cm 2 at an extremely low threshold electric field ( E th ) of 1.0 V/µm, from an array of pillars of aligned carbon nanotube bundles, which were grown on a Si substrate by thermal chemical vapor deposition. Adjusting the dist…
Based on ab initio calculations we find that ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{Si}$ alloys in the Fe-rich region behave as a disordered ferromagnetic half metal. Half metallicity can explain the recently found electronic, magnetic, and transport properties. We can also determine a sharp transit…
The angle dependences of the magnetoresistance of two different isotopic substitutions (deuterated and undeuterated) of the layered organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{ET}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ are presented (where ET is the organic molecule bis(ethylenedithio)-tetrathiaf…
A series of novel palladium catalysts supported on carbon nanofibers of various nanostructures have been prepared, characterized, and tested in gas-phase synthesis of dimethyl oxalate. Significant improvements in both activity and selectivity have been achieved over well-defined carbon nanofiber supported palladium ca…
Several polycrystalline samples of the half-Heusler alloy NiMnSb were grown by arc melting of stoichiometric and nonstoichiometric amounts of high-purity constituent elements. The structure and the phase-purity of the prepared samples were examined systematically by powder x-ray diffraction. The transport properties o…
Electrostatically bonded SiO2.Au nanoparticle clusters form by reaction of 3-aminopropylsilane-modified SiO2 spheres (470 nm) with citrate-coated gold nanoparticles (9.7 nm) in water. Reaction of the clusters with 0.01 M KBr or HCl solution induces desorption of the gold nanoparticles within minutes. Reaction of the c…
Peptide dendrimers incorporating 3,5-diaminobenzoic acid 1 as a branching unit (B) were prepared by solid-phase synthesis of ((Ac-A(3))(2)B-A(2))(2)B-Cys-A(1)-NH(2) followed by disulfide bridge formation. Twenty-one homo- and heterodimeric dendrimers were obtained by permutations of aspartate, histidine, and serine at…
We present theoretical studies of peptide amphiphile nanostructures created by Stupp and co-workers [Hartgerink, J. D.; Beniash, E.; Stupp, S. I. Science 2001, 294, 1684] and show that these amphiphiles exhibit attractive electrostatic interactions between their hydrophilic headgroups. These interactions prevail in th…
Abstract Summary: An attenuated total reflection FT‐IR spectroscopic study of the hydrogen bonding, molecular orientation, and crystalline phase transitions in polyamide 6 (PA6)/clay nanocomposite (PA6CN) fibers is proposed. The nanoscale dispersed clay layers lowered the degree of order of hydrogen bonding, affected…
The thermodynamic interactions in poly(styrene-block-ferrocenyldimethylsilane) and poly(isoprene-block-ferrocenyldimethylsilane) copolymers were systematically tuned by oxidation of the ferrocene moieties with silver nitrate. Small-angle X-ray scattering experiments show that oxidizing 8% of the ferrocene moieties low…
We have performed resistivity and work function measurements on a series of samples with Ln0.7D0.3MnO3 composition, where Ln is a lanthanide (La, Pr, or Nd) and D is a nominally divalent ion (Sr, Ca, or Pb). The resistivity measurements are, within some small variation, in agreement with those previously reported for…
2-Enoyl-CoA hydratase 2, a part from multifunctional enzyme type 2, hydrates trans-2-enoyl-CoA to 3-hydroxyacyl-CoA in the (3R)-hydroxy-dependent route of peroxisomal beta-oxidation of fatty acids. Unliganded and (3R)-hydroxydecanoyl coenzyme A-complexed crystal structures of 2-enoyl-CoA hydratase 2 from Candida tropi…
The complex impedance of a ${\mathrm{Pr}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50--403 K) and is found to be characteristic of relaxation process with a single Debye time relaxation constant, which is interpreted…
Structural characteristics of phase transformations in epitaxial ferroelectric films are analyzed via a Landau–Devonshire thermodynamic formalism. It is shown that the phase transformation temperature, the lattice parameters, and the order of the phase transformation are a strong function of the misfit strain and are…
Apart from a reflecting and a transparent state, rare-earth-Mg alloys (RE-Mg) exhibit also a highly absorbing, black state during loading with hydrogen. The occurrence of such a black state is due to the disproportionation into subwavelength size ${\mathrm{REH}}_{2+\ensuremath{\epsilon}}$ and Mg grains during the firs…
The Mie theory for electromagnetic scattering by spherical particle is extended to the case of magnetic particle with gyromagnetic type of permeability. Specifically, we first construct for the magnetic induction B(I) inside the particle a new set of vector basis functions, which are the solution of the wave equation…