Modern Liquid Phase Kinetics
Empirical treatment of reaction sites Complex reactions Solvent effects on reaction rates Fast reactions in solution Two-phase liquid-liquid reactions.
Materials Literature
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Imaging of boron dopant in highly oriented diamond films by cathodoluminescence in a transmission electron microscope
Boron-doped, highly oriented, (100) textured diamond films have been examined by cathodoluminescence in a transmission electron microscope to assess the distribution of the defects and boron dopant within the films. Dislocation-related luminescence, which is believed to be unrelated to boron, was found to originate in…
New Materials for Liquid Crystal Displays: Structure–Property Relationship of 2‐Fluoropyridines
The synergy of theory and experiment also works for liquid crystals. Relatively simple calculations offer explanations for the unexpected effect of an alkoxy terminus on the dipole moment of liquid crystal molecules such as 1 and point the way to efficient syntheses of new materials with highly attractive properties f…
Electron localization effects on the conducting state in polyaniline
Electron localization effects in polyaniline have been investigated through the dependence of DC conductivity and magnetic susceptibility on thermal aging. A dramatic effect of thermal aging on conductivity is reported in the insulator-to-metal transition region, which is interpreted as due to the onset of structural…
Structure and properties of polyvinyl alcohol amidoxime chelate fiber
Abstract Polyvinyl alcohol amidoxime (PVAAO) chelate fiber prepared in our laboratory is a good adsorbent. Comparing with other adsorbents, it has many advantages, such as higher hydrophilicity, better adsorbability and easier synthesis. In this work, the synthesis course, structure and properties of PVAAO fiber have…
Fractionated crystallization in polyolefins–nylon 6 blends
Abstract The crystallization behavior of polyolefins–nylon 6 polymer blends was studied by differential scanning calorimetry (DSC) measurements. In these blends, the crystallization of the minor component often starts with distinctly deeper supercooling than that of the pure polymer, and proceeds in several separate s…
Ferromagnetism of the Me3(Fe(CN)6)2.H2O compounds, where Me=Ni and Co
We have studied the structural and magnetic properties of two compounds from the Me 3 2+ (Fe 3+ (CN) 6 - ) 2 3- .H 2 O family, where Me=Ni and Co. From x-ray analysis we find that the compounds crystallize in the face-centred cubic structure with the space group of F43m. Both the Fe and Me ions are coordinated octahed…
Interfacial Energies Providing a Driving Force for Ge/Si Heteroepitaxy
Epitaxy of Ge on Si(001) from undersaturated solutions demonstrates a novel principle: minimization of interfacial energy between solution and solid in a system provides the driving force for heteroepitaxy. Growth according to this principle leads to sharp heterointerfaces and Ge layers free of nucleation sites for di…
A Mossbauer and X-ray diffraction investigation of Li-Ti ferrites
Li 0.5+0.5x Ti x Fe 2.5-1.5x O 4 , x<or=0.7, has been investigated using X-ray powder diffraction (17-70 degrees 2 theta ) and Mossbauer spectroscopy (300 and 77 K). All compositions show single cubic spinel structure with a constant lattice parameter of 0.833 nm. The room temperature Mossbauer spectra gave magnetic s…
Aqueous dispersion of polyurethane anionomers from H12MDI/IPDI, PCL, BD, and DMPA
Abstract Polyurethane anionomer dispersions were prepared from hydrogenated diphenylmethane diisocyanate (H 12 MDI) or isophorone diisocyanate (JPDI), poly(caprolactone) (PCL) diol, 1,4‐butane diol (BD), and dimethylolpropionic acid (DMPA). Upon neutralization of the DMPA with triethylamine (TEA), the NCO‐terminated p…
New Porphyrin Isomers
Examples of only the second known man-made isomer of porphyrin (1, Ar = C6H5, C6H4CH3) have recently been prepared by two groups working independently on opposite sides of the globe. These groups, led by L. Latos-Grażyński and H. Furuta, have shown that this isomer displays characteristics expected for a porphyrin whi…
Stable Silanetriols as Building Blocks for the Synthesis of Titanasilasesquioxanes—Model Compounds for Titanium‐Doped Zeolites
The first Ti4Si4 heterocubane with twelve edges bridged by O atoms was prepared in good yields and characterized by X-ray crystallography. According to the IR spectrum of 1, the characteristic band for Ti-containing zeolites at approximately 960cm−1, the assignment of which had been debated, arises from the SiOTi st…
Wetting Behavior of Homopolymer Films on Chemically Similar Block Copolymer Surfaces
The wetting properties of thin polystyrene (PS) homopolymer films (polymerization index ${N}_{H}$) were studied on the surfaces of polyvinylpyridine-polystyrene (PVP-PS) block copolymer films (polymerization indices ${N}_{\mathrm{PS}}$ and ${N}_{\mathrm{PVP}}$) oriented into lamellae with the PS block present at the v…
Melting behavior of ultra‐high modulus and molecular weight polyethylene (UHMWPE) fibers
Abstract Superheating and double‐melting endotherms are the characteristic melting behaviors of gel‐spun ultra‐high modulus and molecular weight polyethylene (UHMWPE) fibers in differential thermal analysis (DTA). A mostly orthorhombic structure with very little amorphous content is indicated by wide angle x‐ray scatt…
Evidence for grain boundary hopping transport in polycrystalline diamond films
We have investigated electrical transport in undoped diamond films prepared by chemical vapor deposition. Using an electrolytic decoration scheme we prove that currents flow predominantly on grain boundaries. From the temperature and the frequency dependencies we conclude that hopping transport takes place. The conduc…
Thermal conductivity of sputtered and evaporated SiO2 and TiO2 optical coatings
The thermal conductivity of SiO2 and TiO2 optical coatings are measured in the temperature range 80–400 K. For SiO2, the thermal conductivity of sputtered and evaporated films are 77% and 55% of the bulk value, respectively, independent of temperature. Similarly, the thermal conductivity of evaporated TiO2 is 63% of t…
Effects of the rare-earth ions on some properties of a nickel-zinc ferrite
The effect of Fe substitutions by rare-earth ions on magnetic and electrical properties of a Ni-Zn ferrite prepared by the classical method is investigated. A set of seven compounds with formula Ni 0.7 Zn 0.3 Fe 1.98 R 0.02 O 4 , where R identical to Yb, Er, Dy, Tb, Gd, Sm or Ce, was prepared. Emphasis is placed on cu…
Dielectric dispersion in aluminium doped zinc—manganese ferrites
The dielectric constant ε, loss tan δ, and conductivity σ of aluminium doped zinc—manganese ferrites of general formula Zn0.3Mn0.7Fe2−xAlxO4 (with x values ranging from 0.2 to 1.0) are studied as a function of frequency, in the range 5 to 500 kHz and in the temperature range 30 to 150 °C. All these samples are found t…
Fundamental optical absorption edge and compositional disorder in γ1-(GaxIn1−x)2Se3 single crystals
Results are given of an investigation of the absorption processes at the absorption edge of the ternary system (GaxIn1−x)2Se3 in the In-rich region. In E ∥ c polarization, the absorption coefficient for all investigated concentrations exhibits an exponential dependence on photon energy following Urbach's rule. The ana…
Radiation amorphization and recovery of crystal structure in Gd3Ga5O12 single crystals
Single crystals of gallium-gadolinium garnet (GGG) irradiated by fluences of fast neutrons (0 to 3.8 × 1024 m−2) are investigated by X-ray and magnetic methods. It is found that irradiation with high fluences leads to complete amorphization of the samples. Besides, the samples recover their single crystalline structur…