Materials Literature
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The determination of dislocation distribution parameters is discussed for specimens where both strain broadening caused by dislocations and size broadening occur. If the strain broadening is well described by a model due to Wilkens, several methods are possible for the analysis of the broadening of diffraction lines.…
Polyaniline (PANi) with grafted poly(styrenesulfonic acid) (PSSA) side chains from atom transfer radical polymerization (ATRP), and covalently immobilized on the hydrogen-terminated Si(100) surface (Si–H surface), was prepared via: (i) UV-induced coupling of 4-vinylaniline (VAn) on the Si–H surface (Si–VAn surface), (…
We have devised a new technique for producing and studying giant pendant colloidosomes based on transferring particle-coated pendant water drops in oil through a planar oil–water interface.
Ga2(NMe2)6 is transformed into highly porous GaN based materials via ammonolysis in solution and subsequent pyrolysis at 673 K in an ammonia stream. The addition of long chain aliphatic amines (n-C6H13NH2-n-C12H25NH2) in solution allows the condensation reaction to be directed and results in microporous GaN based mate…
We have investigated the induction of ferroelectric SmC* liquid crystals using an atropisomeric biphenyl dopant (R)-1 in binary SmC host mixtures consisting of a 2-phenylpyrimidine host, either 2-PhP1 or 2-PhP2, and one of three structurally similar smectic components (co-hosts). The co-hosts include two 5-phenylpyrim…
We report the crystal structure and phase transitions of Mo2P4O15 which, despite a simple chemical formula, has 441 crystallographically unique atoms in its asymmetric unit and thus has the most complex structure of any extended oxide reported to date.
Polymer impregnation and pyrolysis (PIP) is one of the most attractive fabrication processes for silicon carbide (SiC) composites due to the shape flexibility, mass production and relatively low cost. In particular, advanced PIP SiC/SiC composite with high-crystallinity and near-stoichiometric composition is expected…
The present paper describes the grain size refinements of Mg alloys (AZ61, AZ91, ZK60) by HDDR treatment. As a result of the HDDR treatment at 350°C under a hydrogen pressure of 7 MPa for 24 h, following by evacuation at 350°C for 3 h, the grain size of AZ61 alloys was reduced from 10∼20 μm to 100∼200 nm. At the hydro…
Abnormal salt content dependence of conductivity is observed in solid electrolytes exclusively composed of small molecules of 3-hydroxypropionitrile (HPN) and lithium iodide (LiI) induced by reinforced hydrogen bonding and formation of ionic clusters at high salt content.
Powdered [Cu(L2NH2)2][ClO4]2 (1; L2NH2 = 2,6-bis{hydrazonomethyl}pyridine) and [Cu(L2OH)2][ClO4]2 (2; L2OH = 2,6-bis{oximomethyl}pyridine) exhibit EPR spectra that are consistent with {dz2}1 Cu(II) centres at 295 K. These slowly transform upon cooling to 5 K, to show g-values that more closely resemble {dy2−z2}1, pseu…
The nature of intrinsic emission bands of yttrium orthoaluminate in the UV spectral region at max=220 nm (5.63 eV) and 330 nm (4.13 eV) is studied on the basis of the luminescence of single crystals and single-crystal films of YAlO3 and Ce: YAlO3 excited by synchrotron radiation sources with an energy of 3–25 eV at 9…
Abstract A novel water swellable rubber (WSR) was prepared by blending chlorohydrin rubber (CHR) with crosslinked polyacrylate (CPA), poly(vinyl alcohol)‐g‐poly(butyl acrylate) (PVA‐g‐PBA), precipitated silica (PSA), and poly(ethylene glycol) (PEG). The amphiphilic graft copolymer PVA‐g‐PBA was incorporated as the com…
In previous study, the extremely high reaction rate obtained by the mechanical milling has been reported. It was found that the phenomena were quite complicated and the many factors were affected on the reactivity. Among these factors, the crystal state of hematite and atmosphere (air and argon) during the milling wer…
Abstract Einkristalle von Lanthanoid‐Sesquiseleniden (M 2 Se 3 ; hier: M = Ce, Gd, Lu) gewinnt man bei der Umsetzung der Elemente (Lanthanoid und Selen) im molaren Verhältnis von 2:3 innerhalb von sieben Tagen bei 850 °C in evakuierten Quarzglasampullen, wenn äquimolare Mengen an NaCl als Flußmittel zugegen sind. Im F…
Nanowires with polymer shells were produced via radical grafting polymerization of methyl methacrylate using treated carbon nanotube bundles as macro-initiators, thereby providing an efficient way to produce high grafting ratio nanocomposites.
We present here the synthesis of hierarchical calcite, grown in the presence of acidic glycoproteins isolated from adult spines of the sea urchin Evechinus chloroticus. Hierarchical growth is only achieved when kinetic growth control (attained for high concentrations of calcium ion) is superimposed on the thermodynami…
The physical vapor deposition process of serial bideposition is adapted to the fabrication of uniaxial optical coatings. During the coating process the vapor impinges at an angle of incidence of about 70 on to the substrate, and a stepwise axial rotation with 90 increments causes a columnar structure to grow normal to…
The cathodoluminescence and optical-transmission spectra of ZnS were analyzed to study the effect of a high hydrostatic gas pressure (1500 atm at 1000°C) on the equilibrium between intrinsic point defects in zinc sulfide grown by chemical vapor deposition (CVD) with an excess of zinc. The cathodoluminescence spectra w…
The effect of carbon topology on nitrogen adsorption at zero coverage on a variety of carbonaceous materials: graphite, a nanotube bundle, C60 fullerite, C168 schwarzite, and a nanoporous carbon is studied systematically using full atomistic Monte Carlo simulations. The pairwise additive site–site Lennard-Jones potent…
There are two eutectic systems in the Al2O3-rich portion of the Al2O3–Y2O3 system: one is the Al2O3–YAG equilibrium eutectic system and the other is the Al2O3–YAP metastable eutectic system. Heating the Al2O3–YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the e…