Materials Literature
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1. The avian eggshell is a biomineralised composite ceramic consisting of calcium carbonate embedded in an organic matrix. Matrix components are supposed to be involved in the control of mineralisation, crystallographic texture and biomechanical properties of eggshell. 2. The structure and eggshell matrix composition…
The intercalation of inorganic materials into organized organic assemblies presents many opportunities for the development of new functional materials with superior physicochemical properties. We have designed a composite material comprising Prussian blue intercalated into photoresponsive organic molecules (azobenzene…
A series of polyhedral oligomeric silsesquioxanes (POSS) monomers bearing silane or α-olefin substituents have been prepared and their chemistry explored. Both the POSS silanes and α-olefin monomers readily participate in hydrosilation chemistry and have been used as starting materials for the preparation of POSS sol–…
A novel interatomic potential energy function is proposed for condensed systems composed of silicon and oxygen atoms, from SiO 2 to Si crystal. The potential function is an extension of the Stillinger-Weber potential, which was originally designed for pure Si systems. All parameters in the potential function were dete…
${\mathrm{CaMnO}}_{3\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ with $\ensuremath{\delta}=0,$ 0.06, and 0.11 was prepared by the Pechini citrate gel process at 1100 \ifmmode^\circ\else\textdegree\fi{}C. Oxygen defects were created by quenching the sample from high temperature. Chemical analysis and x-ray abs…
Dense BaTiO 3 ceramics consisting of submicrometer grains were prepared using the spark plasma sintering (SPS) method. Hydrothermally prepared BaTiO 3 (0.1 and 0.5 µm) was used as starting powders. The powders were densified to more than similar/congruent95% of the theoretical X‐ray density by the SPS process. The ave…
This paper considers a mixture of sedimenting particles at low Reynolds numbers and volume fractions. Simple theoretical arguments have long suggested that for a random suspension of particles in an infinite system, the fluctuations in the velocity about the mean should diverge with system size. On the other hand, exp…
Macromolecular phase-refinement and phase-extension calculations using real-space electron-density averaging techniques require accurate envelopes (or masks) to define the boundaries of each domain or molecule whose density is to be averaged. An extensive set of tools, implemented in four computer programs (O, MAMA, C…
Activated sintering in Bi 2 O 3 ‐doped ZnO has been studied with emphasis on the mechanistic role of intergranular amorphous films. The atomic‐level microstructures and bismuth solute distributions in doped powders have been investigated using high‐resolution electron microscopy and scanning transmission electron micr…
Abstract Various π-conjugated polymers have been obtained by using organometallic polycondensations mediated by organotransition metal complexes. For example, Ni(0) complex-promoted dehalogenation polycondensation of dihaloaromatic compounds X–Ar–X affords poly(arylene)s,n. Pd-catalyzed polycondensation gives poly(ary…
Submicron size spheres of silica and alumina prepared by well-known methods were coated sonochemically by nanoparticles of oxides of europium and terbium using the same concentration of ions. We have also used sonochemistry to prepare nanoparticles of silica and alumina doped by the same rare-earth ions for comparison…
An overview of the low-energy dislocation structure (LEDS) theory of low-temperature, that is non-creep, dislocation-based crystal plasticity is presented, as systematically developed over the past 35 years. It is ultimately based on G. I. Taylor's 1934 theory of work hardening wherein he assumed that stress applicati…
Composites consisting of polymer matrix materials and natural or synthetic layered minerals e.g. clays were prepared by using special compatibilizing agents between these two intrinsically non-miscible components. Block or graft copolymers combining one part of the polymer that is identically and/or completely miscibl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Novel Mild Route to Nanocrystalline Selenides at Room TemperatureWenzhong Wang, Yan Geng, Ping Yan, Fuyu Liu, Yi Xie, and Yitai QianView Author Information Structure Research Laboratory and Department of Chemistry University of Science and Technology of China Hefei,…
Conformational changes on complex formation have been measured for 39 pairs of structures of complexed proteins and unbound equivalents, averaged over interface and non-interface regions and for individual residues. We evaluate their significance by comparison with the differences seen in 12 pairs of independently sol…
New lead structures for olefin oxidation catalysts have been obtained from a combinatorial library of 5760 metal–ligand complexes (see the microscopy picture). Iron complexes led to clean epoxide product formation using H2O2 as the terminal oxidant. Parallel libraries were used to determine ligand features important f…
MolScript is one of the most popular programs for the generation of publication-quality figures and the recent re-working of the program should ensure its continued popularity. However, some functionality of particular interest to crystallographers is not part of the standard program. A modified MolScript version 1.4…
This paper presents a methodology for the preparation of a-HgI2 by Physical Vapor Transport and of PbI2 crystals using the Bridgman technique. The results of the growth of HgI2 diluted in PbI2 by the Bridgman technique are shown for the first time, its limit of solubility having been determined at 600 ppm of HgI2 in t…
Boron-doped polycrystalline diamond films have been deposited over silicon substrate by hot-filament chemical-vapor-deposition process. A gas mixture of 0,5 vol. % methane and 1 vol. % methanol on hydrogen at a pressure of 50 Torr, have been used. Boric oxide dissolved in methanol have been used as the boron doping so…