Materials Literature
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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…
Improved endothelialization without platelet adhesion is essential to enhance the long-term patency of synthetic vascular grafts and other blood-contacting devices. We have developed a dually modified polyurethaneurea by incorporating endothelial cell adhesive YIGSR peptide sequences as chain extenders and nonthrombog…
Abstract Chitosan coatings prominently improved both the gloss and oxygen barrier properties of paper. The gloss value in the machine direction was increased as a function of added chitosan. An oxygen‐permeability value of 1.1 cm 3 /m 2 d was obtained when 6.9 g/m 2 chitosan was applied to 80 g/m 2 copy paper. In addi…
The combination of combinatorial techniques for the synthesis as well as for the screening of novel star-shaped block copolymers consisting of a poly(ethylene glycol) core and a poly(caprolactone) shell leads to a fast evaluation of interesting properties of these materials. The polymers could be synthesized in a full…
We use transient photoluminescence to spectrally resolve the emission from 1, 2, and 3 electron-hole pairs states in $\mathrm{CdSe}$ colloidal quantum dots with radii ranging between 2.3 and $5.2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The power dependence of the triexciton, biexciton and single exciton emission inten…
Room-temperature ferromagnetism is observed in chemically synthesized powder samples of Sn1−xCoxO2 with x=0.005 and 0.01. Magnetic hysteresis loops are observed at 300K with coercivity Hc∼630Oe, saturation magnetization Ms∼0.133μB∕Co ion, and about 31% remanence. Analyses of the magnetization data of paramagnetic samp…