Materials Literature
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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…
Dense KNbO 3 ceramics have been successfully synthesized by pressure-less sintering under optimized heat-treatment conditions using a small amount of La 2 O 3 and Fe 2 O 3 additives. KNbO 3 forms (K 1- x La x )(Nb 1- x Fe x )O 3 solid solutions and changes in the crystal system, depending on the additive content, from…
PURPOSE: To determine the maximum tolerated dose of the combination of Carboplatin and Caelyx, a pegylated liposomal doxorubicin, with promising activities in various solid tumors. PATIENTS AND METHODS: Twenty-two patients with various advanced solid tumors were included. Three dose levels of Caelyx were explored: 30,…
We propose a technique to measure in situ the refractive index changes induced by ionizing radiation in single-mode optical fibers. This change can be derived from the channel drift appearing in narrow channel wavelength-division-multiplexing couplers exposed to gamma radiation. We measured a radiation-induced refract…
Here we investigate the stabilization process on the active outer/inner surfaces (or the end plane of a graphene sheet) for shortened cup-stacked-type carbon nanotubes caused by annealing, utilizing both analytic and electrochemical techniques. The suggested schematic procedure for loop formation is as follows: (a) fo…
The residual stress of multilayer ceramic capacitors (MLCCs) has been studied. The capacitance decreased significantly under external compressive stress applied to MLCCs in the thickness direction, on the other hand, the capacitance increased under external stress in the width direction. These capacitance changes depe…
Effects of oxygen adsorption on the structural and transport properties of single wall carbon nanotubes (SWCN's) are investigated in detail using ab initio and generalized tight-binding molecular-dynamics methods. We find that the oxygen-SWCN interaction depends strongly on the spin configuration which, in turn, speci…