Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSurface Engineering of Poly(lactic acid) by Entrapment of Modifying SpeciesRobin A. Quirk, Martyn C. Davies, Saul J. B. Tendler, and Kevin M. ShakesheffView Author Information School of Pharmaceutical Sciences, The University of Not…
The new complexes of formula AsPh4[Cr(phen)(ox)2]·H2O (1), [NaCr(phen)(ox)2(H2O)]·2H2O (2) and {[Cr(phen)(ox)2]2[Mn2(bpy)2(H2O)2(ox)]}·6H2O (3) (AsPh4=tetraphenylarsonium cation; phen=1,10-phenanthroline; ox=oxalate dianion; bpy=2,2′-bipyridine) have been prepared and characterized by single-crystal X-ray diffraction.…
Octylsilane-grafted hexagonal mesoporous silica removed low-concentrated nonylphenol, an endocrine disrupter, in water with high efficiency comparable to that of activated carbon, while the adsorbent showed no detectable uptake of phenol.
The biotic and abiotic degradation of poly (L-lactide) (PLLA) has been studied with pyrolysis gas chromatography mass spectrometry (Py-GC-MS). A mixed culture of compost micro-organisms was used as the biotic medium. Size-exclusion chromatography (SEC), gas chromatography-mass spectrometry (GC-MS), Fourier transform i…
Diatoms studies of French running waters over more than twenty-five years revealed the recent appearance of a number of species which could not have been overlooked before because of their abundance or size. Their absence in modern European floras supports the idea fo a recent introduction of these taxa in Europe; The…
In this letter, BaSrTiO/sub 3/ (BST) interdigitated capacitors on sapphire substrates have been investigated. The tunability and quality factor of interdigital capacitors have been optimized for microwave and millimeter wave applications. A monolithic K-band phase shifter circuit that employs voltage tunable BaSrTiO/s…
The atmospheric corrosion of zinc has been studied at 4, 22, and 38°C. The samples were exposed to synthetic air with careful control of CO 2 concentration, relative humidity, and flow conditions. The relative humidity was 95%, and the concentrations of CO 2 were <1 and 350 ppm, respectively. Sodium chloride was added…
The title compounds have a molecular tube-like structure topologically related to the α-M(dca)2 rutile structure, and display unusual field-dependent magnetic moments at low temperature but without long-range order.
The deformation and fracture behavior of several dynamic vulcanizate blends of isotactic polypropylene with ethylene-propylene-diene rubber (EPDM) was examined and compared with those of uncrosslinked blends of PP/EPDM. These blends were prepared by melt mixing in an internal mixer at 190°C in a composition range of 1…
Employing a broadband microwave reflection configuration, we have measured the complex surface impedance, ${Z}_{S}(\ensuremath{\omega},T),$ of single-crystal ${\mathrm{La}}_{0.8}{\mathrm{Sr}}_{0.2}{\mathrm{MnO}}_{3},$ as a function of frequency $(0.045--45 \mathrm{GHz})$ and temperature $(250--325 \mathrm{K}).$ Throug…
Mesoporous TiO2 is prepared stable up to 500 °C with BET surface area of 603 m2 g−1 and pore size 6.9 nm, and Sn–TiO2 composites based on the mesoporous TiO2 show good potential as an electrode for lithium batteries with large capacity and structural integrity.
We propose an oxygen surface exchange model in which the effect of vacancies at the gas‐mixed ionic electronic conductor interface are included and apply the model to isotope exchange, oxygen permeability, and electrical conductivity relaxation. We deduce relationships between the surface‐exchange coefficients associa…
The bulk polycondensation of L-aspartic acid (ASP) with an acid catalyst under batch and continuous conditions was established as a preparative method for producing poly(succinimide) (PSI). Although sulfuric acid, p-toluenesulfonic acid, and methanesulfonic acid were effective at producing PSI in a high conversion of…
Hexakis(phenylamino)cyclotriphosphazene, hexakis(phenoxy)cyclotriphosphazene, tris(o-phenylenediamino)cyclotriphosphazene, tris(phenylene-1,2-dioxy)cyclotriphosphazene and tris(phenylene-1-amino-2-oxy)cyclotriphosphazene have been prepared and characterized by IR and NMR spectroscopy. Phospham, a crosslinked phosphaze…
The crystal structures of Ca0.6Sr0.4TiO3 and Ca0.8Sr0.2TiO3 perovskites have been studied at high temperatures by X-ray powder diffraction. The most likely sequence of phase transitions with increasing temperature in Ca0.6Sr0.4TiO3 is the same as that shown by the system CaTiO3–SrTiO3 with increasing Sr content at roo…
By impregnating γ-Al2O3 with cerium/zirconium citrate solutions and subsequent calcination, nanostructured CemZr1−mO2 mixed oxides supported on Al2O3 are obtained, which feature remarkably high oxygen storage even after calcination at 1100 °C for 24 h.
The diffusion coefficient and solubility of water molecules were measured in polyglycolide (PGA), poly(L-lactide) (PLLA), poly[(R)-3-hydroxybutyrate] (PHB), poly(ϵ-caprolactone) (PCL), and SkygreenR (SG). The diffusion coefficient and equilibrium solubility decreased in the order SG > PCL > PLLA > PHB > PGA and PGA >…
We present a Monte Carlo method for the direct evaluation of the difference between the free energies of two crystal structures. The method is built on a lattice-switch transformation that maps a configuration of one structure onto a candidate configuration of the other by "switching" one set of lattice vectors for th…
The successive phase transformations in MgO‐doped BaTiO 3 were studied. Upon MgO doping, dielectric anomalies corresponding to lower phase transformations were broadened and depressed, while an anomaly for a cubic–tetragonal transformation remained and shifted to a lower temperature. XRD peak splitting upon tetragonal…
A precursor was synthesized from a heterogeneous alkoxide solution that contained fine MgO powder, which allowed the preparation of MgAl 2 O 4 spinel powder with high sinterability characteristics. The precursor consisted of a mixture of boehmite (AlO(OH)) and a mixed hydroxide (Mg 4 Al 2 (OH) 14 · 3H 2 O). The spinel…