Materials Literature
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High-resolution X-ray diffraction of high-purity multiwall carbon nanotubes has been performed and unusual diffraction physics was observed. Fourier analysis confirms that the multiwall nanotubes are made of concentric cylinders and that there is a non-uniform distribution of inner tube diameter. The interference effe…
The purpose of this study was to clarify the effect of the reducing agent on the oxygen-inhibited layer of the cross-linked reline material. A commercial autopolymerizing reline resin containing 1,6-hexanediol dimethacrylate as cross-linking agent and 1 wt.% sodium sulphite solution as a reducing agent was prepared. T…
Confocal laser scanning microscopy (CLSM) is used to follow the dynamic structural evolution of several phase-separated mixed biopolymer gel composites. Two protein/polysaccharide mixed gel systems were examined: gelatin/maltodextrin and gelatin/agarose. These materials exhibit 'emulsion-like' structures, with include…
Abstract Light emission generated by a high‐energy electron passing through surfaces, thin films and particles of several materials were studied using a light detection system combined with a transmission electron microscope with an accelerating voltage of 200 kV. A silver film with a rough surface gives rise to inhom…
COLO 205 is a cell line derived from a human colon carcinoma with high degradative activity towards extracellular matrix (ECM). It has been shown that COLO 205 cells produce matrix metalloproteinases (MMPs). MMPs are a family of enzymes known to degrade components of the ECM and have been implicated in tumor invasion.…
Abstract Rengeite, Sr 4 ZrTi 4 Si 4 O 22 , is a new member of the perrierite–chevkinite group found in the jades from the Itoigawa-Ohmi district, central Japan. It is monoclinic, P2 1 / a , a = 13.97(1), b = 5.675(7), c = 11.98(1)Å, β = 114.26(8)°, V = 866 Å 3 and Z = 2. The six strongest lines in the X-ray powder dif…
Well-defined diblock copolymers of isoprene and 2-vinylpyridine (2VP) were prepared by sequential anionic polymerization at temperatures of 45 and 6−8 °C, respectively, in benzene solution using sec -BuLi as initiator in the presence of lithium chloride ([LiCl]/[PLi] = 5−11). Rapid quenching with acidic methanol 4−7 m…
The stimulation of planar silica surfaces through catalytic activation and methane exposure leads to the formation of radial patterns of carbonated silica fibers (see Figure). The growth originates from circular patterns, which result from the interaction of nickelocene with the silica substrate during annealing.
A combination of the shape selectivity of zeolites and the chemical sensitivity of solvatochromic dyes (e.g., Cu(tmen)(acac)+, the title complex in the Figure) provides the potential to develop highly selective optical sensors. The dye incorporated into the nanopores of hexagonal faujasite-type zeolites has been studi…
SiCN and CN films were prepared by nitrogen ion-assisted pulsed-laser deposition. The dependence of silicon addition in CN film on the chemical bonds between carbon and nitrogen was examined. The formation of the sp 3 bond between carbon and nitrogen is promoted by the addition of silicon. The binding energies in X-ra…
Intracavitary vaginal applicators typically incorporate internal shielding to reduce dose to the bladder and rectum. While dose distributions about a single colpostat have been extensively measured and calculated, these studies neglect dosimetric perturbations arising from the contralateral colpostat or the intrauteri…
The aim of this work is to investigate the performance of molten carbonate fuel cells (MCFCs), with external sensible heat reformer and gas turbine/steam turbine (GT/ST) combined cycles. The analysis of these MCFC-GT/ST combined cycles has been carried out using the thermo economic modular program (TEMP) modified to a…
Samples of pure (Ca 2 FeAlO 5 ) and lightly doped (Ca 2 Fe 0.95 Al 0.95 Mg 0.05 Si 0.05 O 5 ) brownmillerite have been synthesized. Synchrotron X-ray and neutron diffraction data have been collected so that the structures can be refined using, simultaneously, both diffraction data sets and known compositional informat…
To investigate the effects of silicon, additions of 0.3, 1, and 1.5% were made to an Mg–6Al master alloy. Two types of Mg2Si particle morphology were observed, namely, squarelike and ‘Chinese script’. Silicon improved the fluidity, hardness, and microhardness, but decreased the impact toughness of Mg–6Al alloy. High…
Using the local-density approximation, and calculating the Hellmann–Feynman forces, the stability of the perovskite-like structures of CaTiO3 have been studied by applying the direct method and deriving the phonon dispersion relations. The cubic Pm3̄m phase shows dispersionless soft phonon branch spreading from R to M…
The effect of Er ion incorporation into the stoichoimetric BaTiO 3 on the dielectric properties and microstructural developement was studied. In the case of Er addition to the stoichoimetric BaTiO 3 up to 2.0 mol%, there was no change in the Curie temperature. The presence of excess Er greater than 3.0 mol% led to an…
Abstract The reciprocal lattices of a range of rare earth titanate and zirconate pyrochlores have recently been shown to exhibit an extremely characteristic diffuse intensity distribution identical in form to that characteristic of β -cristobalite implying the existence of β -cristobalite-like orientational disorder o…
Semiconducting germanium clathrates are thermoelectric materials with cage-like structures that exhibit “phonon glass, electron crystal” behavior. We report an improvement by at least a factor of 3 in the dimensionless thermoelectric figure of merit for the clathrate semiconductor Sr8Ga16Ge30 upon compression to 7 GPa…
A series of RE(Nc)(TBPP) (1−12) complexes [RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Y, Ho, Er, Tm; Nc = 2,3-naphthalocyaninate; TBPP = meso-tetrakis(4-tert-butylphenyl)porphyrinate] and Eu[Nc(tBu)4](TClPP) [Nc(tBu)4 = tetra(tert-butyl)-2,3-naphthalocyaninate; TClPP = meso-tetrakis(4-chlorophenyl)porphyrinate] (13) have be…
We determine surface tensions σ of smectic liquid crystals from the curvature pressure of smectic films. A new technique is introduced for the comparison of surface tensions of different smectic materials. The method is based on the relation of curvatures of smectic films drawn on communicating vessels. The measuremen…