Materials Literature
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Vanadium dioxide (VO(2)) undergoes a reversible metal-insulator transition, normally at approximately 68 degrees C. While the properties of continuous semi-transparent coatings of VO(2) are well known, there is far less information available concerning the potential use of discrete VO(2) nanoparticles as a thermochrom…
Abstract Five different homoleptic gallium complexes with malonic diester anions [Ga(ROCOCHOCOR) 3 ] [R = Me ( 1 ), Et ( 2 ), i Pr ( 3 ), t Bu ( 4 ) and SiMe 3 ( 5 )] have been synthesised and characterised by 1 H and 13 C NMR, IR spectroscopy, electron ionisation mass spectrometry (EI‐MS), and single‐crystal X‐ray di…
Abstract The many faces of crystals : Silica mesoporous crystals were synthesized by using a co‐structure directing method. Structural defects in the crystals with Fd $\bar 3$ m symmetry—described as tetrahedrally close‐packed and consisting of 5 12 and 5 12 6 4 polyhedra—were found (see figure). These defects were ex…
ZnO recently receives extensive interest owing to its potential applications in the dilute magnetic semiconductor. In this work, Al was deposited onto the surface of ZnO film followed by high vacuum annealing. The film showed the room temperature ferromagnetism (RTF). The saturation magnetization (Ms) highly depends o…
Amorphous calcium carbonate (ACC) plays important roles in biomineralization, and its synthesis in vitro has been of keen interest in the field of biomimetic materials. In this report, we describe the synthesis of ACC films using a novel acid polysaccharide, maleic chitosan, as an additive. We prepared the films by di…
X-ray fluorescence (XRF) measurements on solutions or crystals of biological macromolecules provide additional information that can be used in structure determination and/or refinement protocols. Here details are presented of an experimental setup, employed on all the ESRF Macromolecular Crystallography Group beamline…
The aim of this study was to evaluate the safety and tissue compatibility of an injectable biodegradable poly(ester-anhydride) copolymer of ricinoleic acid (RA) and sebacic acid (SA) in rats. The absorbable biomaterial containing 70% w/w of RA and 30% w/w of SA [P(SA-RA) 3:7] was implanted in rats in two separate stud…
In this Letter, we calculate the density of states of graphene under a highly uniform magnetic field and white-noise random potential. We discover that the disorder-broadened zero-energy Landau band has a Gaussian shape and its width is proportional to the random potential variance and the square root of magnetic fiel…
A method to determine the thickness of a nonabsorbing thin film on an absorbing substrate is presented. A linear relation between the thin-film thickness and the tangent wavelength of the reflectance spectrum for a specific interference order is revealed, which permits the calculation of the thickness provided that th…
This paper reports the accurate measurement of the ReO 3 cell parameter as a function of temperature. The thermal expansion is confirmed to be negative over most of the temperature range from 5 to 300 K. The main problems with the measurements are the very small variations (in the range of 10 −5 Å) in the cell paramet…
Abstract A comparative study of ethylene vinyl acetate nanocomposites based on expanded graphite, multiwalled carbon nanotubes, and carbon nanofibers has been carried out to investigate the effect of different carbon nanofillers on the electrical properties of the corresponding composites. The composites were prepared…
A tetragonal perovskite PbMnO(3) was obtained by treating the 6H hexagonal perovskite phase at 15 GPa and 1273 K. Structural analysis using synchrotron X-ray diffraction suggested that PbMnO(3) crystallizes in the centrosymmetric space group P4/mmm, unlike PbTiO(3) and PbVO(3) which have a polar structure in space gro…
Manganese(II/III) complexes of a phenol-based tetradentate ligand L(2-) [H(2)L = N,N'-dimethyl-N,N'-bis(2-hydroxy-3,5-dimethylbenzyl)-ethylenediamine], namely, [Mn(4)(L)(2)(PhCOO)(6)] (1), [Mn(3)(L)(2)(CH(3)CH(2)COO)(2)(OMe)(2)].H(2)O (2), and [Mn(L){(CH(3))(3)CCOO}(CH(3)OH)].CH(3)OH (3), have been synthesized. The ba…
Abstract Two valencies instead of one! Stoichiometric valence and structural valence are two distinct properties of atoms. The former, stoich V , is derived from the composition of a compound and has integer values; the latter, struct V , depends on the structure of a compound and has non‐integer values. The scheme sh…
Control yourself! The mesoporous silica nanofibers (MSNFs) from dual structure-directing agents were fabricated inside the pores of porous alumina (AAO, see figure) by using vapor phase synthesis. The pore structures could be controlled to form a range of structures from mesocellular foams to cylindrical mesopores wit…
We report the results of a fast thermal desorption spectroscopy study of the H/D isotopic exchange kinetics in a few micrometer thick, pure polycrystalline ice film and in ice films doped with HCl. Using the isotopic exchange reaction as a probe of transport processes in ice, we determined the effective H/D interdiffu…
A pH-insensitive fluorophore is made to give pH-driven responses through its covalent incorporation within a nanostructure derived from pH-responsive polymers. Fluorophore-shell-crosslinked nanoparticles (SCKs) demonstrate notable enhancement of photophysical properties, in the physiological pH region. Fluorophore-SCK…
Whether adsorbates might effectively lower the ionization potential (IP) of open-ended boron nitride nanotubes (BNNTs) in order to design BNNTs based on flat-panel display devices is an unanswered question. In the present work, through density functional theory (DFT) calculations we present the first attempt on the ef…
Abstract Preparation of E‐glass/waterborne epoxy prepregs containing natural nanoclay and properties of their composites are presented. Prepregs were prepared by wetting randomly oriented, chopped glass fiber preforms with aqueous dispersion of EpiRez 3522‐W‐60 resin, dicyandiamide, 2‐methylimidazole and natural nanoc…
Abstract In order to prevent the properties, especially transparency, color and health security, of PET/clay nanocomposites from being deteriorated due to the thermal degradation of clay organo‐modifer, we had directly modified sodium montmorillonite (Na + ‐MMT) with PET's monomer, bis (hydroxyethyl) terephthalate (BH…