Materials Literature
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An eggshell finish: Designed peptides can be used as a tool to unravel the structure–activity relationships of eggshell matrix proteins. The ordered arrangement of doublets of charged residues on the peptide and its self-assembling characteristics play a key role in the biomimetic nucleation of polycrystalline calcite…
The effects of Ta barrier thickness on electromigration reliability of dual-damascene Cu/porous methylsilsesquioxane interconnects were investigated. With decreasing Ta barrier thicknesses, the threshold product of current density and line length (jL)c was found to be reduced due to less structural confinement from th…
Abstract This study demonstrates the first observation of energy transfer from the doublet state of the nitronyl nitroxide radical ligand in Ln III complexes, exerting the light‐harvesting antenna effect on the NIR luminescence for the first time. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Abstract An overview of recent density‐functional‐based studies on the structure, surface structure and electronic and optical properties of CdS, CdSe and CdS/CdSe semiconductor nanoparticles is given. In particular, the effects of organisation, embedding and surfactants on the properties of these particles are discus…
Binuclear complexes of cobalt(III) have been prepared with 3,3',4,4'-tetrahydroxy-benzaldazine (H4thB), 3,3',4,4'-tetrahydroxy-5,5'-dimethoxybenzaldazine (H4thM), and 3,3',4,4'-tetrahydroxydimethylbenzaldazine (H4thA) as bis(catecholate) ligands that link metal ions separated by 16 A through a conjugated bridge. In on…
The structural and electronic properties of fully-relaxed $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}(001)$ surfaces with oxygen vacancies are investigated by first-principles calculations. The large displacements of ions deviated from their crystalline sites to lead to the formation of the surface rumpling have been obta…
The salt [K(18-crown-6)][Mn(H2O)2Cr(ox)3.0.5(18-crown-6) (1) has been prepared and structurally and magnetically characterized. It crystallizes in the P2(1)/c space group [a = 21.011(2) A, b = 11.265(2) A, c = 15.748(3) A, beta = 105.952(6) degrees , V = 3584(1) A3, and Z = 4] and contains [Mn(H2O)2Cr(ox)3]infinity ch…
In Minutenschnelle: Die hydrothermale Bildung von faserförmigem MoO3 wurde mit komplementären In-situ-Methoden verfolgt. Die In-situ-EDXRD-Untersuchungen zeigen, dass die quantitative Bildung innerhalb weniger Minuten beendet ist (Bild: zeitaufgelöste Pulverdiffraktogramme bei 120 °C). Eine speziell konstruierte In-si…
The H 3 PW 12 O 40 and H 4 SiW 12 O 40 heteropolyacids supported on silica were studied by 1 H MAS NMR as a function of both the coverage and the dehydroxylation temperature. The signal at ca. 8 ppm attributed to the highly acidic protons of the anhydrous form of the heteropolyacid was never observed in the case of th…
Formula unit volume, Vm, has recently been identified as the key link to a number of thermodynamic functions and has given rise to an alternative approach to thermodynamics for modern inorganic materials (volume-based thermodynamics, VBT). In an earlier publication, we reported over 400 ion volumes for commonly encoun…
Micropatterns of silica on a gold substrate were generated by a biomimetic approach, namely, the biosilicification of silicic acids. The procedure consists of three simple steps: pattern generation of a polymerization initiator, (BrC(CH(3))(2)COO(CH(2))(11)S)(2), by microcontact printing; surface-initiated, atom-trans…
PVC is the most common insulation material used for wiring in low-voltage (LV) service. ‘Low-voltage’, in the context of this paper, is taken to be 120–240 VAC. The electrotechnical products considered include insulated wires, cables and cords, and also appurtenant termination devices, e.g. male plugs or female taps.…
Used in the preparation of Si3N4 components, rare-earth elements promote the growth of needlelike grains essential to elevated toughness; evidently, La is significantly more effective than Lu. To explore this difference, we determine the three-dimensional organization of rare-earth atoms in the amorphous phase near pr…
By calculating the elastic stability using the full-potential linearized augmented plane waves (FLAPW) method, three noble metal nitrides ($\mathrm{Ir}{\mathrm{N}}_{2}$, $\mathrm{Ag}{\mathrm{N}}_{2}$, and $\mathrm{Au}{\mathrm{N}}_{2}$) were found to be stable with the fluorite structure. Together with $\mathrm{Pt}{\ma…
Just a minute: The hydrothermal formation of fibrous MoO3 is monitored with complementary in situ methods. The quantitative formation is complete within a few minutes, as shown by in situ EDXRD investigations (see picture: time-dependent powder diffractograms at 120 °C). A special in situ EXAFS cell permits the simult…
Tungsten trioxide adopts a variety of structures which can be intercalated with charged species to alter the electronic properties, thus forming ``tungsten bronzes.'' Similar effects are observed upon removing oxygen from $\mathrm{W}{\mathrm{O}}_{3}$. We present a computational study of cubic and hexagonal alkali bron…
Nb-doped SrTiO$_{3}$ epitaxial thin films have been prepared on (001) SrTiO$_{3}$ substrates using pulsed laser deposition. A high substrate temperature ($>1000^{\circ}{C}$) was found to be necessary to achieve 2-dimensional growth. Atomic force microscopy reveals atomically flat surfaces with 3.9 Å$ $ steps. The film…
The properties of antiferromagnetic ferromagnetic bilayer have been studied using self-consistent mean-field approximation for Heisenberg Hamiltonian. The perpendicular exchange coupling has been revealed in a bilayer with a compensated interface. For a uniform antiferromagnetic film a symmetrical hysteresis loop has…
We demonstrate that surface plasmon polaritons can be guided by nanometer scale dielectric waveguides. In a test experiment plasmons were coupled to a curved 3 micrometer radius dielectric stripe, which was 200 nm wide and 138 nm thick using a parabolic surface coupler. This experiment demonstrates that using surface…
A modification of the Frenkel-Kontorova model is presented in which particles are allowed to move in the vertical direction. This model is used to study the formation of islands for a monolayer of 1D interfaces and the corresponding roughness transition. Both analytical and numerical approaches are employed, and the n…