Materials Literature
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Abstract New frontiers in materials and polymer science include the development of assembly processes that are flexible, allow the access and implementation of nanoscale structure and order, can provide access to a broad range of materials systems, and yet can be implemented at relatively low cost. The ability to fine…
Abstract A new crystalline complex zinc nickel sulfate heptahydrate (ZNSH) has been prepared. The crystal structure was investigated by x‐ray single crystal diffraction method and the empirical formula is Zn 0.24 Ni 0.76 (SO 4 )·7H 2 O. The ZNSH crystal belongs to the orthorhombic space group P2 1 2 1 2 1 with cell pa…
Inelastic neutron scattering spectra from polycrystalline NaH, KH, RbH and CsH, measured at low temperature in the energy transfer range 3 meV< E < 500 meV, are reported. From the medium-energy regions, coinciding with the optical phonon bands, accurate hydrogen-projected densities of phonon states are extracted and c…
Abstract d‐ or f‐mononuclear and d,f‐heterodinuclear complexes with the [1+1] asymmetric compartmental macrocycles H 2 L A , H 2 L B , H 2 L C or H 2 L D , derived from the condensation of 1,2‐diaminoethane or 1,3‐diaminopropane with 3,3′‐(3‐oxapentane‐1,5‐diyldioxy)bis(2‐hydroxybenzaldehyde) or 3,3′‐(3,6dioxaoctane‐1…
There are two growth modes, tip- and base-growth modes, in carbon nanotube (CNT) synthesis. We have shown that the determining factor for the growth mode is the adhesion force of the catalytic metal particles to the substrate through a systematic study of the synthesis in the plasma-enhanced chemical vapour deposition…
Abstract The work is devoted to investigation of stable color centers (CC) that are created in Gd 3 Ga 5 O 12 (GGG) crystals under irradiation with γ‐quanta ( E = 1.25 MeV, D = 10 5 Gy ) as well as transient CC created in the crystals under irradiation with pulsed electron beam ( E = 0.25 MeV, pulse duration 10 ns, fl…
The crystal and magnetic structures of the manganite Pr 0.75 Na 0.25 MnO 3 with non-integer mean valence (Mn 3+ /Mn 4+ ) have been studied by means of powder neutron diffraction at high pressures up to 8 GPa in the temperature range 1.5–295 K. At ambient pressure, the system undergoes a charge ordering at T CO = 220 K…
Abstract Summary: The stability of nanoporous materials as a result of surface interaction forces has been considered in this paper. We show that cylindrical pores in linear elastic materials will collapse if α = γ / μ A > 2. As one would expect physically, smaller cavities tend to be more unstable for the same sur…
The structures of orthorhombic GdAlO3 and GdFeO3 perovskites have been refined at room temperature and pressure using single-crystal x-ray diffraction and their equations of state have been measured to pressures of 7.95 and 7.58 GPa, respectively. Both structures are distorted through the tilting and distortion of the…
The crystal structure, its variation within the homogeneity range and some physical properties of the new zinc-rich, partly disordered phase Ir7+7deltaZn97-11delta (0.31< or =delta< or =0.58) are reported. The structures of three phases with distinct composition were determined by means of single crystal X-ray diffrac…
Abstract Summary: The 3,4‐ethylenedioxythiophene (EDOT) monomer in a chiral nematic liquid‐crystal electrolyte was polymerized by application of a voltage to yield a thin film. Circular dichroism measurements indicated a Cotton effect for the film. Optical texture suggests that the polymer shows a finger‐print texture…
This work measures the C and O K-edge x-ray absorption near-edge structure (XANES) spectra of hydrogenated amorphous carbon (a-C:H) films deposited at various baking temperatures T b ( T b = 300–500 °C at 50 °C). The C–H σ * peak related to the content of the sp 2 graphite-like bonding in the C K-edge spectra was foun…
A theory of heterostructures comprised of ${\mathrm{LaTiO}}_{3}$ (a Mott insulator) and ${\mathrm{SrTiO}}_{3}$ (a band insulator) is presented. The band structure of the $\mathrm{Ti}$ $d$-electrons is treated with a nearest neighbor tight-binding approximation; the electric fields arising from the ${\mathrm{La}}^{3+}∕…
Carbon nanotubes (CNTs) and carbon nanofibres (CNFs) were synthesized by the thermal chemical vapour deposition (CVD) process using an Ni-MgO catalyst. The Ni-MgO catalyst was treated by a mechanochemical (MC) process to govern its size and morphology. The grinding time in the MC process and pyrolytic temperature in t…
A well-described animal model was used to understand the molecular mechanisms of carcinogenesis and metastasis of gastric cancer at the protein level. Gastric cancer was induced in 12 Wistar rats by oral administration of N-methyl-N'-Nitro-N-Nitrosoguanidine (MNNG). The protein expression patterns of normal gastric ti…
The applicability of a European numerical diatom index, the Specific Pollution sensitivity Index (SPI), was tested in a river system where the SPI scores were compared both to chemical water quality and to scores yielded using a macro-invertebrate index of riverine health namely the South African Scoring System (SASS…
Polyelectrolyte multilayer microcapsules were recently suggested as a new type of nanoengineered microstructures and are potentially important in many areas of science and technology. The present review focuses on the mechanics of these microstructures, emphasizing novel experimental approaches and the main experiment…
It is shown that a bare ${\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{3}$ cluster can oxidize CO to form ${\mathrm{C}\mathrm{O}}_{2}$ and reduce NO to form ${\mathrm{N}}_{2}$ by undergoing compositional changes between ${\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{2}$ and ${\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{3}$ states. Inv…
Introductory chapter for the book "Halfmetallic Alloys - Fundamentals and Applications" to be published in the series Springer Lecture Notes on Physics, P. H. Dederichs and I. Galanakis (eds). It contains a review of the theoretical work on the half-metallic Heusler alloys.
Spherical (S) and tesseral (T) tensor operators (TOs) have been extensively used in, for example, EMR and optical spectroscopy of transition ions. To enable a systematic review of the published tables of the operators and their matrix elements (MEs) we have generated the relevant tables by computer, using Mathematica…