Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Using a first-principles pseudopotential method we have studied the interaction processes involved in the adsorption of ammonia on the germanium surfaces. We have found that ammonia adsorbs molecularly on the germanium surface and, in contrast to the interaction of the same species with the silicon surface, no dissoci…
The crystal growth of x Pb(In 1/2 Nb 1/2 )O 3 - y Pb(Mg 1/3 Nb 2/3 )- z PbTiO 3 (PIMNT 100 x /100 y /100 z ) and x 'Pb(Sc 1/2 Nb 1/2 )O 3 - y 'Pb(Mg 1/3 Nb 2/3 )- z 'PbTiO 3 (PSMNT 100 x '/100 y '/100 z ') ternary systems was investigated by the solution Bridgman method using PbO-B 2 O 3 flux. A PIMNT single crystal 2…
We report total-energy electronic structure calculations that provide the energetics of encapsulation of C 70 fullerenes in carbon nanotubes. The encapsulation processes for C 70 in tubes thicker than (17,0) are all exothermic. We find that the lying arrangement is energetically favourable for the thin nanotubes, wher…
Abstract For Abstract see ChemInform Abstract in Full Text.
Uniaxial compressive stress and electrical field responses were investigated using the X5R-type multilayer ceramic capacitor with Ni internal electrode (Ni-MLCC). Capacitance change was dependent on the applied direction of the stress. TCC curve under compressive stress and electrical field was measured. The peak of t…
Abstract Analytical studies of sponges have recently become a matter of interest, since these organisms have been reported to accumulate high levels of some elements, including heavy metals, which may have an anthropogenic origin, allowing their application as environmental pollution indicators. In the present work, 3…
PbTiO 3 nano-islands were prepared on Pt(111)/SiO 2 /Si(100), Pt(111)/SrTiO 3 (111) and Pt(110)/SrTiO 3 (110) substrates by metalorganic chemical vapor deposition (MOCVD). When PbTiO 3 was deposited on Pt(111)/SiO 2 /Si, PbTiO 3 nano-islands on different Pt grains had different in-plane orientations. On the other hand…
The interactions of antithrombin (AT) and the contact phase clotting factors with two commercially available heparinized surfaces are reported. The Carmeda (CBAS) and Corline surfaces along with controls (a sulfonated polyethylene surface and a CBAS analog in which the heparin used was devoid of specific AT-binding se…
A new form of Y(2)Si(2)O(7) (diyttrium heptaoxodisilicate) has been synthesized which is isotypic with thortveitite, Sc(2)Si(2)O(7), and crystallizes in the centrosymmetric space group C2/m, both at 100 and 280 K. The Y(3+) cation occupies a distorted octahedral site, with Y-O bond lengths in the range 2.239 (2)-2.309…
Elastic, electronic and vibrational properties of seven models of nanoporous carbon are reported. The studied structures are periodic graphitic arrangements with heptagonal and octagonal rings of carbon, known as Schwarzites. The calculations were performed within a non-orthogonal tight binding framework which has bee…
Dielectric and Electromechanical Properties of Pb(Zr,Ti)O3 Thin Films for Piezo-Microelectromechanical System Devices, Kim, Seung-Hyun, Yang, Jeong-Suong, Koo, Chang Young, Yeom, Jung-Hoon, Yoon, Euijoon, Hwang, Cheol Seong, Park, Joon-Shik, Kang, Sung-Goon, Kim, Dong-Joo, Ha, Jowoong
The reactions of [fac-Re(CO)(3)(bpy)(MeOH)](PF(6)), bpy = 2.2'-bipyridine, with the TCNX ligands (TCNE = tetracyanoethene, TCNQ = 7,7,8,8-tetracyano-p-quinodimethane, and TCNB = 1,2,4,5-tetracyanobenzene) in CH(2)Cl(2) gave very different results. No reaction was observed with TCNB whereas TCNE produced very labile in…
The conformational studies of peptide derivatives A and B in a gel state were studied by using circular dichroism (CD), Fourier transformed infrared (FTIR), and fluorescence spectroscopic techniques. Birefringence and electron microscopic studies were carried out to characterize the morphological aspects of the fibril…
Studies in developmental and cell biology have established the fact that responses of cells are influenced to a large degree by morphology and composition of the extracellular matrix. Goal of this work is to use this basic principle to improve the biological acceptance of implants by modifying the surfaces with compon…
A study was conducted on the effects of compositional modifications on the temperature coefficient of resonance frequency (TCF) in the disc planar vibration mode for the bismuth layer-structured compound SrBi 2 Nb 2 O 9 (SBN)-based ceramics. The substitution of the strontium site by divalent and trivalent ions improve…
Low-temperature sintering of LiBiO 2 -coated 0.375Pb(Mg 1/3 Nb 2/3 )O 3 -0.25PbZrO 3 -0.375PbTiO 3 (PMN-PZT) powders was investigated with surface modification through the hydrolysis of lithium ethoxide and bismuth tri-t-amiloxide on the surface of PMN-PZT powders, and their microstructure and piezoelectric properties…
This paper reviews recent results in the field of carbon nanotube (CNT) research obtained at our institute at EPFL. We show in particular that CNTs can be synthesized by the catalytic vapour deposition (CVD) technique with high efficiency and purity. Furthermore, we present recent examples of advances in the large-sca…
We report on vacancy induced half-metallicity in the prototype Mott-insulating substances MnO and NiO. By embedding a cation vacancy into a magnetic system a new road opens up to the construction of half-metallic antiferromagnets. For ${\mathrm{Ni}}_{0.97}\mathrm{O}$ we find a half-metallic antiferromagnet, a system h…
Polyelectrolyte multilayers constructed from polypeptides present secondary structures similar to those found in proteins (α-helices and β-sheets). These secondary structures are used as a tool to investigate the buildup and internal stability of multilayer films by means of Fourier transform infrared spectroscopy. Sp…
Using tight-binding molecular dynamics we simulate the formation of single wall carbon nanotube T junctions via the fusing of two nanotubes. We propose energetically efficient pathways for this process in which all atoms maintain their sp(2) arrangements throughout. Recent experimental advances have greatly increased…