Materials Literature
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Micro-Raman spectroscopy of $\mathrm{La}\mathrm{Co}{\mathrm{O}}_{3}$-based perovskites was performed to characterize the vibrational properties of these Raman active rhombohedral perovskites and their temperature and stress induced changes. The cobaltite spectra were found to consist of four Raman active phonon modes…
[Mn4(hmp)6(H2O)2(NO3)2](NO3)2.2.5H2O (1) has been synthesized from the reaction of 2-hydroxymethylpyridine (Hhmp) with Mn(NO3)2.4H2O in the presence of tetraethylammonium hydroxide. 1 crystallizes in the triclinic P space group with two crystallographically independent centrosymmetrical [Mn4(hmp)6(H2O)2(NO3)2]2+ compl…
X-ray scattering measurements on optimally-doped single crystal samples of the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ reveal the presence of three distinct incommensurate charge modulations, each involving a roughly fivefold increase in the unit cell dimension along the {\bf b}-direction. The st…
We present a detailed comparison between ONETEP, our linear-scaling density functional method, and the conventional pseudopotential plane wave approach in order to demonstrate its high accuracy. Further comparison with all-electron calculations shows that only the largest available Gaussian basis sets can match the ac…
Ethenylene groups within the silicate framework of hybrid mesoporous ethenylene-silica (HME) are successfully modified via a two-step chemical modification process (see Figure) to produce a sulfonic acid-functionalized hybrid mesoporous solid acid catalyst. The material exhibits high activity for various acid-catalyze…
Absorption of circularly polarized light in semiconductors is known to result in optical orientation of electron and hole spins. It has been shown here that in semiconductor quantum well structures spin orientation of carriers can be achieved by linearly or even unpolarized light. Moreover, the sign and magnitude of t…
The real-space multiple-scattering approach is applied to model nonresonant inelastic scattering from deep core electron levels over a broad energy spectrum. This approach is applicable to aperiodic or periodic systems alike and incorporates ab initio, self-consistent electronic structure and final state effects. The…
Nano-sized particles of ceramic and metallic materials are generated by high-tech industrial activities, and can be generated from worn-out replacement and prosthetic implants. The interaction with the human body of such nanoparticles has been investigated, with a particular emphasis on innate defence mechanisms. Huma…
Ten specially synthesized polyurethanes (PUs) were used to investigate the effects of surface properties on platelet adhesion. Surface composition and hydrophilicity, fibrinogen (Fg) and von Willebrand's factor (vWf) adsorption, monoclonal anti-Fg binding, and platelet adhesion were measured. PUs preadsorbed with afib…
We discuss the possibility of THz amplification and generation in nano-structures, by means of 2D plasma waves. Numerical estimates have been made for room temperature and for sufficiently good GaAs materials.
Alignment phenomena are characteristic of liquid crystalline materials, and understanding them is critically important in understanding the essential features and behavior of liquid crystals and the performance of Liquid Crystal Devices (LCDs). Furthermore, in LCD production lines, the alignment process is of practica…
Advancement of semiconductor devices requires the realization of an ultrathin diffusion barrier layer between Cu interconnect and insulating layers. The present work investigated the possibility of the self-forming barrier layer in Cu–Mn alloy thin films deposited directly on SiO2. After annealing at 450 °C for 30 min…
A series of novel zinc metalloporphyrins, cyano-3-(2'-(5',10',15',20'-tetraphenylporphyrinato zinc(II))yl)-acrylic acid (Zn-3), 3-(trans-2'-(5',10',15',20'-tetraphenylporphyrinato zinc(II))yl)-acrylic acid (Zn-5), 2-cyano-5-(2'-(5',10',15',20'-tetraphenylporphyrinato zinc(II))yl)-penta-2,4-dienoic acid (Zn-8), 4-(tran…
The synthesis and characterization of nanosized materials is an important issue in basic science research as well as in technological applications, as they have their own charac-teristic optical, electronic, magnetic, and catalytic properties greatly different from the bulk materials. Therefore, considerable effort ha…
<TEX>$Ag_4Br_4$</TEX> nanoclusters have been synthesized in about 75% of the sodalite cavities of fully <TEX>$K^+$</TEX>-exchanged zeolite A (LTA). An additional KBr molecule is retained in each large cavity as part of a near square-planar <TEX>$K_4Br^{3+}$</TEX> cation. A single crystal of <TEX>$Ag_{12}$</TEX>-A, pre…
A simple uniaxial pressure device suitable for closed cycle refrigerator system (CCRS) has been built. This device in principle is applicable to any crystal. In this device the pressure can be varied smoothly and continuously to any desired temperature using a disc-micrometer and a spring – holder attachment, which ar…
In the vapor-diffusion protein-crystallization method, a small drop containing protein sample mixed with a crystallization solution is equilibrated against a reservoir solution in a sealed chamber. Whereas the chemical composition of the crystallization solution is critical for success, the primary role of the reservo…
A finite volume holographic grating coupler (VHGC) normally illuminated with various incident-beam profiles (such as a Gaussian beam, a flat cosine-squared beam, and an exponential-decay beam) with finite beam widths for input coupling is rigorously analyzed by use of the finite-difference frequency-domain method. The…
Durch Variation der Zeit zwischen der Zugabe eines co-strukturdirigierenden Agens und einer Silicatquelle zu einem anionischen Tensidtemplat lassen sich geordnete kubische oder ein neuartiges tetragonales (P42/mnm) Mesokäfigmaterial aus micellaren Kugeln unterschiedlicher Größe erhalten. Das Bild zeigt den hoch aufgel…
$\mathrm{K}{\mathrm{H}}_{2}\mathrm{P}{\mathrm{O}}_{4}$ (KDP) crystals doped with Mn ions were studied by an x-ray multiple diffraction technique using synchrotron radiation at room temperature. Asymmetric peaks were observed for both undoped and doped crystals, a characteristic of perfect crystals. X-ray powder diffra…