Materials Literature
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ZnO films were grown at 450°C by metalorganic vapor phase epitaxy on GaN∕Si(111) substrate and subsequently annealed in situ at 900°C for times ranging from 0 to 8min. The epitaxial layers were characterized by atomic force microscopy, x-ray diffraction, and cathodoluminescence measurements. The as-grown ZnO layers co…
While the crystal thickness and melting point in crystallizable homopolymers are kinetically controlled, an equilibrium degree of chain folding is predicted for crystalline−amorphous block copolymers. We demonstrate this effect in a series of diblock copolymers of hydrogenated polynorbornene and hydrogenated poly(ethy…
The deposition of (La 0.85 Sr 0.15 ) 0.95 MnO 3 - δ films on an yttria-stabilized zirconia substrate was studied by the electrostatic spray deposition (ESD) technique. Films with various morphologies were obtained. The surface morphology was strongly influenced by the precursor solution flow rate and deposition temper…
Abstract Oxo‐ or hydroxo‐bridged diiron centers are ubiquitous in metalloenzymes such as hemerythrin (Hr), ribonucleotide reductase, methane monooxygenase, and rubrerythrin. In each enzyme the diiron core plays a central role in the highly specific reaction. To elucidate mechanisms of these reactions, many experimenta…
Using the Gemini surfactant [C 12 H 25 N + (CH 3 ) 2 -(CH 2 ) 2 -N + (CH 3 ) 2 -C 12 H 25 ]·2Br - (abbreviated as C 12-2 - 12 ) with the short spacer group ( s = 2) as structure-directing agent and sodium silicate as precursor, high-quality ordered cubic mesoporous silica (space group Ia 3 d ) was prepared through the…
The correlation between thermoelectric properties and texture strength is discussed within the framework of Ca3Co4O9 textured ceramics. Based on an innovative method of x-ray diffraction analysis, the distribution density (i.e., the degree of orientation) of composite material composed of Ca3Co4O9 powder and single cr…
Using a synchrotron-radiation source and a diamond-anvil cell, we measured the pressure dependence of the lattice parameters of a polycrystalline Zr2InC sample. Up to a pressure of 52GPa, no phase transformations were observed. As observed in Ti3SiC2 and Ti3Si0.5Ge0.5C2, the compressibility of Zr2InC along the c axis…
Bismelamine supramolecular synthon featuring a flexible methylene tether shows excellent gelation ability in organic solvents on binding with amphiphilic cyanurate or barbiturates. Physical properties of the resulting gel can be facilely tunable by changing the cyanurate/barbiturate components.
Vanadium environments in Keggin oxopolytungstates were characterized by (51)V solid-state MAS NMR spectroscopy. (C(4)H(9))(4)N(+)-, K(+)-, Cs(+)-, as well as mixed Na(+)/Cs(+)- salts of the mono-, di-, and trivanadium substituted oxotungstates, [VW(11)O(40)](4-), [V(2)W(10)O(40)](5-), and [V(3)W(9)O(40)](6-), have bee…
We have examined the stability of double wall carbon nanotubes under hydrostatic pressures up to 10 GPa. The tangential optical phonon mode observed by inelastic light scattering is sensitive to the in-plane stress and splits into a contribution associated with the external and internal tube. While the pressure coeffi…
This paper describes, for the first time, a simple sonochemical method for the synthesis of nanoparticles of a series of rare earth orthoferrites. This sonochemical process is enabling synthesis of nanoparticles of the rare earth orthoferrites at a substantially lower calcination temperature by using simple precursors…
A bulk composite superhard material was synthesized from graphitelike BC3 at 20GPa and 2300K using a multianvil press. The material consists of intergrown boron carbide B4C and B-doped diamond with 1.8at.%B. The material exhibits semiconducting behavior and extreme hardness comparable with that of single-crystal diamo…
Designing nanoparticles for practical applications requires knowledge and control of how their desired properties relate to their composition and structure. Here, we present a detailed systematic study of mixed iron−manganese oxide nanoparticles, showing that ultrasonication provides the high-energy reaction condition…
Optical absorption spectra of the ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ single crystals and luminescence spectra of the ${\mathrm{Y}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}:\mathrm{Yb}$ (1%) polycrystalline samples were registered at temperatures $4.2--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. These spec…
Reported is the preparation and characterization of phosphonic acid-modified and alkoxy silane-modified multiwalled carbon nanotubes (MWCNTs). Also reported is the use of these modified MWCNTs to template the assembly of titanium dioxide and silica nanoparticles, respectively. Some potential applications of these find…
Looking beyond the traditional applications of polyurethanes (PUR), Polyurethanes as Specialty Chemicals presents a different approach to polyurethane chemistry by examining a range of new products and new research for both environmental and medical applications. This book is also the first in its field to provide use…
We determined the vanadium oxidation state and local coordination environment in disordered samples of magnetic $\mathrm{V}{[\mathrm{TCNE}]}_{x}(x\ensuremath{\approx}2)$ prepared by chemical vapor deposition (CVD). Systematic studies of the x-ray absorption near-edge structure (XANES) in this material and reference co…
Highly ordered Mg/Al-based layered double hydroxide (LDH) nanocrystals on Si substrates were successfully obtained by ultrasonic treatment in organic solvents. LDHs intercalated with aliphatic α,ω-dicarboxylate were prepared through anion exchange by solvothermal treatment at around 100 °C. Binary solvent mixtures of…
Atom transfer radical polymerization (ATRP) was used to prepare a new series of ABA triblock copolymers that are photoactive thermoplastic elastomers. The samples synthesized have the same rubbery midblock of poly( n -butyl acrylate) (PnBA) but differ in the degree of polymerization of the end blocks of a methacrylate…
The correlation between optical, structural, and light-emitting properties of annealed Si-rich silica samples containing different amounts of Si nanocrystals is studied. The intensity of the 1.6eV emission band weakens when the Raman signal coming from the Si nanocrystals gets stronger. On the contrary, the absorption…