Materials Literature
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NBT presents an orthorhombic to tetragonal second order phase transition that occurs near 320 °C. It corresponds to the so-called antiferroelectric−paraelectric phase transition. A model is presented in which the diffuse phase transition is achieved by the progressive canceling of the antiphase octahedra tilting preva…
Novel superstructures of multilayered ZnO nanosheets with hierarchically porous structures are successfully synthesized from a hydrothermal preparation and thermal decomposition of a layered precursor of zinc hydroxide carbonate (denoted as ZnHC). Nanosheet-based ZnHC microspheres are self-assembled by the hydrotherma…
Part 1 Natural-fibre composites: Natural fibres for composite applications: Types and properties Matrices for natural-fibre reinforced composites Engineering the fibre/matrix interface in natural-fibre composites Processing techniques for natural and wood-fibre composites Development of non-wood natural-fibre composit…
We examine the conditions necessary for the presence of localized magnetic moments on adatoms with inner shell electrons in graphene. We show that the low density of states at the Dirac point, and the anomalous broadening of the adatom electronic level, lead to the formation of magnetic moments for arbitrarily small l…
Isotropic negative permeability resulting from Mie resonance is demonstrated in a three-dimensional (3D) dielectric composite consisting of an array of dielectric cubes. A strong subwavelength magnetic resonance, corresponding to the first Mie resonance, was excited in dielectric cubes by electromagnetic wave. Negativ…
Nanocrystals of the three-dimensional, spin-crossover, porous coordination framework [Fe(pz)Pt(CN)4]⋅n H2O (pz=pyrazine; n≤2.5) have been synthesized from water-in-oil microemulsions. The surfactant-free nanocrystals readily desorb water and the resulting anhydrous compounds exhibit thermally induced electronic bistab…
This study shows for the first time that the rhombohedral to tetragonal phase transition in Na 0.5 Bi 0.5 TiO 3 (NBT) is a two step phase transition. The transformation begins by a first order phase transition involving the reconstructive transformation of the rhombohedral phase into an orthorhombic one, through the f…
The X-ray diffraction (XRD) tests showed that the diffraction lines of hkO,h-k=3n in the hexagonal closed packing structured (HCPS) ZnO appeared only crystallite broadening effect.The two- fold broadening effects of crystallite-fault could be observed in the diffraction lines of h-k=3n±1,yet the selective broadening w…
Abstract Multiphased ternary and quaternary mixed crystals were grown by the melt method, for the first time, using the miscible alkali halides, viz. NaBr, KBr and KCl. X‐ray powder diffraction measurements indicate the existence of multiple phases. Density and refractive index were measured and the composition was de…
A Comment on the Letter by S. A. Tatarkova et al., [Phys. Rev. Lett. 98, 157801 (2007)]. The authors of the Letter offer a Reply.Received 10 October 2007DOI:https://doi.org/10.1103/PhysRevLett.101.029801©2008 American Physical Society
Abstract A new amphiphilic Pluronic (F68)‐PLGA copolymer, which can be used to prepare the stealth or long‐circulating nanoparticles, was synthesized with Pluronic (F68), DL ‐Lactide, and glycolide. The structures of Pluronic (F68)‐PLGA copolymer as the products were characterized with infrared spectrometry, nuclear m…
A cementation-like process taking place under potential control and introduced in this work as a "potential-controlled displacement" (PCD) is developed as a new method for processing of nanoporous Ag structures with controlled roughness (porosity) length scales. Most of the development work is done in a deoxygenated e…
The Domerian sections from the Lusitanian Basin of São Pedro de Muel, Rabaçal and Tomar have provided us with more than 1100 Ostracods belonging from 18 genus and about 48 species. The faunal diversity and density of the associations decrease in space (from Tomar to Rabaçal and São Pedro de Muel) and time, with favour…
Abstract A series of organic–inorganic hybrid materials consisting of an organic cyclo‐olefin copolymer (COC) and inorganic titania (TiO 2 ) were successfully synthesized by a sol–gel process. TiO 2 was obtained through the hydrolysis of titanium n ‐butoxide (TNBT) with the catalysis of HCl. Differential scanning calo…
Process control in electron beam welding is typically based on control of machine settings, such as accelerating voltage, beam current, focus coil current, and vacuum level. These settings, though important, provide little insight into the characteristics of the beam used to make the weld. With the enhanced modified F…
We report on the electric-field-generated effects in the nematic phase of a twin mesogen formed of bent-core and calamitic units, aligned homeotropically in the initial ground state and examined beyond the dielectric inversion point. The bend-Freedericksz (BF) state occurring at the primary bifurcation and containing…
Abstract Silk grafting with methacrylic and epoxy monomers was studied with the aim to obtain high graft yields. With both monomer types optimum operating conditions of thermal grafting in water bath were established. In particular, three epoxy monomers were tested at various concentrations, at different temperatures…
Photodynamic therapy: The application of porphyrins in photodynamic therapy has been limited by their low solubility and cellular uptake efficiency. The introduction of a charged polyamine moiety to the lipophilic porphyrin ring can enhance the amphiphilicity of a compound of this class and ultimately lead to greater…
The nonlinearity characteristics of a commercially available deuterated L-alanine-doped triglycine sulfate (DLATGS) pyroelectric detector were experimentally investigated at high levels of illumination using the National Physical Laboratory detector linearity characterization facility. The detector was shown to exhibi…
Abstract Linear/branched PP blends at various ratios were used as the matrix for thermoplastic olefin (TPO) compounds, containing an ethylene–octene copolymer dispersed phase. A detailed investigation of the physical properties of these blends revealed that addition of branched PP (BPP) resulted in improved stiffness…