Materials Literature
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Adsorption of carbon, nitrogen, and oxygen on the (111) surface of delta-Plutonium has been studied within the framework of density functional theory using the full-potential linear augmented plane wave plus local basis (FP-LAPW+lo) method. All adatoms prefer to bind at the higher coordinated hollow sites, with the ch…
Magnesium dihydride contains 7.7 wt % hydrogen. However, its application for hydrogen storage is impeded by its high stability and slow kinetics. Bringing the size of Mg(H 2 ) into the nanometer range will not only enhance the reaction rates but has also been theoretically predicted to change the thermodynamic stabili…
No foaming at the mouth here: A calcium(II) derivative of ammonia–borane, Ca(NH2BH3)2 (see picture; green Ca, red O, blue N, yellow B, gray C, small green H), has thermal properties that are quite different from those of ammonia–borane. Ca(NH2BH3)2 releases hydrogen over a temperature range of 100 to 170 °C without fo…
We describe experiments pertaining to the formation of surface-anchored poly(acrylic acid) (PAA) brushes with a gradual variation of the PAA grafting densities on flat surfaces and provide detailed analysis of their properties. The PAA brush gradients are generated by first covering the substrate with a molecular grad…
We carry out numerical simulations to study transport behavior about the jamming transition of a model granular material in two dimensions at zero temperature. Shear viscosity $\ensuremath{\eta}$ is computed as a function of particle volume density $\ensuremath{\rho}$ and applied shear stress $\ensuremath{\sigma}$, fo…
Based upon the observations (i) that their in-plane lattice constants match almost perfectly and (ii) that their electronic structures overlap in reciprocal space for one spin direction only, we predict perfect spin filtering for interfaces between graphite and (111) fcc or (0001) hcp Ni or Co. The spin filtering is q…
This paper presents the results of PL spectrum studies for Si nano-crystallites embedded in amorphous silicon matrix. Investigated layers were deposited by the hot-wire CVD method on glass substrates at the wafer temperature 300°C and different filament temperatures from the range 1650-1950°C. It was shown that variat…
The Raman spectra of two $G$ bands and a radial breathing mode (RBM) of unfilled and filled single-wall semiconducting and metallic carbon nanotubes have been investigated theoretically in the presence of electron-phonon and phonon-phonon interactions. Excitation of low frequency optical plasmons in the metallic nanot…
Abstract In the present paper the growth of MoO 3 thin films on common glass substrates are described. The films were prepared by evaporation of a MoO 3 target with a CO 2 laser (10.6 μm), operating in the continuous wave mode. The effect of substrate temperature on the crystallographic structure and electrical proper…
The aim of this work is to study optical properties of Si nanohills formed on the SiO2/Si interface by the pulsed Nd:YAG laser radiation. Nanohills which are self-organized on the surface of Si, are characterized by strong photoluminescence in the visible range of spectra with long wing in the red part of spectra. Thi…
Abstract ZrO 2 ‐8% mol. Y 2 O 3 (8YSZ) thin films were deposited onto silicon [100] and AISI 304 stainless steel substrates by r.f. (13.56 MHz) multi‐target magnetron sputtering. To improve the adhesion of a YSZ monolayer to the stainless steel substrate, a buffer layer of Al 2 O 3 was incorporated too. Crystal struct…
Electrochemistry is a powerful tool for initiating new umpolung reactions. In this paper, two examples are provided. One demonstrates the use of electrochemistry for reversing the polarity of known functional groups and triggering carbon-carbon bond formation. The second demonstrates the use of electrochemistry for re…
Abstract Films of two isotactic propylene homopolymers prepared with different catalysts and a propylene/ethylene copolymer were biaxially oriented under conditions of temperature and strain rate that were similar to those encountered in a commercial film process. The draw temperature was varied in the range between t…
Abstract BiMnO 3 thin films were deposited on single‐crystal (001)‐oriented SrTiO 3 substrates by rf‐magnetron sputtering method. X‐ray diffraction was used to analyze the crystal structure of the thin films, indicating that the films were monoclinic with two dominant orientation relationships along the substrate. The…
We find that electrons in single-wall carbon nanotubes may propagate substantial distances (tens of nanometers) under metal contacts. We perform four-probe transport measurements of the nanotube conductance and observe significant deviations from the standard Kirchhoff's circuit rules. Most noticeably, injecting curre…
Periodic mesoporous organosilica (PMO) thin films with long-range molecular order within the organosilica framework have been successfully prepared by spin-coating a solution of 1,4-bis(triethoxysilyl)benzene (BTEB), water, ethanol, HCl, and cetyltrimethylammonium bromide (CTAB) on silicon substrates. Powder XRD patte…
The electrochemical characteristics and stability of poly(1,5-diaminoanthraquinone) (P15DAAQ) has been investigated in different acidic aqueous solution by electrochemical methods and Fourier transform infrared spectroscopy (FTIR). Cyclic voltammetry (CV) analysis suggests that electropolymerization consists of two ph…
Abstract The thermal oxidation of unstabilised POM homopolymer has been studied at 90, 110, and 130°C under various oxygen pressures ranging from 0 to 2.0 MPa by gravimetry and IR spectrometry. This latter reveals essentially the formation of formate (F) groups and alcohols in smaller quantities. The formate growth an…
Abstract A negative donor center D – in a spherical Gaussian potential quantum dot is studied. The calculations have been performed by means of the exact diagonalization of the Hamiltonian matrix within the effective‐mass approximation. The dot‐radius and confinement‐height dependences of the binding energies of the D…
A ligand family of macrocycle polyamines was first used to assist the construction of elegant inorganic microstructures. As an example, hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene (CT) was applied to the morphology control of NiS microstructures at a suitable temperature and ambient atmosphere. Highly unifor…