Materials Literature
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New layered oxides M II 0.5 LaTiO 4 (M = Co, Cu, and Zn) were synthesized via the ion-exchange reaction of parent NaLaTiO 4 in molten salts at 300−450 °C. Eutectic-like mixtures of MCl 2 (M = Co and Cu) and KCl were required for the 1:2 exchange reaction of divalent cobalt and copper ions for monovalent sodium ion at…
The crystalline structure of poly(decamethylene sebacate) has been studied using transmission electron microscopy and X-ray diffraction. The polymer shows polymorphism, since fibers corresponding to both monoclinic and orthorhombic unit cells can be obtained depending on the draw and annealing conditions. The second s…
Synthesis and characterization of the first stable α,ω-bis(silanetriols) containing phenylene, biphenylene, α,ω-bis(phenylene)vinylene, α,ω-bis(phenylene)ethynylene, and α,ω-bis(phenylene)buta-1,3-diynylene organic bridging groups are described. They were obtained by controlled hydrolysis of the corresponding bis(tria…
A model for the dissolution of oxides has been developed recently. It has been tested with silica. The model describes the overall rate constant of dissolution as composed of several reversible elementary reactions. By this way the overall rate constant of dissolution can be expressed in dependence on pH and ionic str…
The observed shifts of the vibrational SERS frequencies with respect to those of the Raman spectrum of pyrazine have allowed us to conclude that the molecule adsorbs to the metal through the unshared electron pair of one of the nitrogen atoms. The same conclusion is reached by observing the behavior of the molecular v…
Nucleation and growth of nanoparticle crystals is often difficult. Recent progress has been made by linking dilute solution properties, such as the osmotic second virial coefficient, B 2, to equilibrium phase behavior of nanoparticle suspensions. These studies show that, at the same values of B 2, broad classes of nan…
This work is a contribution to better knowledge of the influence of the structure of films obtained from emulsions based on arabinoxylans, hydrogenated palm kernel oil, and emulsifiers on their functional properties. The sucrose esters (emulsifiers) have a great effect on the stabilization of the emulsified film struc…
Single walled carbon nanotubes (SWNTs) have been shown to be highly sensitive gas sensors. However, attaching functional groups with selective sensing functions on nanotubes without destroying the intrinsic electronic property of the nanotubes is still challenging. Here, we report a new method of coating SWNTs with a…
We show that two basic mechanical processes, the collision of particles and rolling motion of a sphere on a plane, are intimately related. According to our recent findings, the restitution coefficient for colliding spherical particles ε, which characterizes the energy loss upon collision, is directly related to the ro…
The transmission of kinetic energy through chains of inelastically colliding spheres is investigated for the case of constant coefficient of restitution ε=const and impact-velocity dependent coefficient ε(v) for viscoelastic particles. We derive a theory for the optimal distribution of particle masses which maximize t…
This paper reports on the characteristics and use of a new mode of measurement: High Performance DSC (HPer DSC), which represents a major step forward in high-speed calorimetry, as compared to standard DSC. It facilitates the study of the kinetics and metastability of macromolecular systems, especially the analysis of…
Carbon nanotubes are functionalized by bovine serum albumin (BSA) proteins via diimide-activated amidation under ambient conditions. The nanotube-BSA conjugates thus obtained are highly water-soluble, forming dark-colored aqueous solutions. Results from characterizations using atomic force microscopy (AFM), thermal gr…
An anodic oxidized film has been deposited in pure water at room temperature. Film thickness increases linearly as a function of total charge during oxidation. High film deposition rate and low surface roughness are obtained by alternately changing the polarity of the applied voltage. The film growth mechanism is disc…
Rationally controlled growth of inorganic semiconductor nanowires is important for their applications in nanoscale electronics and photonics. In this article, we discuss the rational growth, physical properties, and integration of nanowires based on the results from the authors' laboratory. The composition, diameter,…
Ion generation and recombination have been characterized in nematic liquid crystal displays. A model for dispersive generation may explain the time dependency of the leakage current through the cell. This current leads to the build-up of a charge layer near the electrodes depending on the resistivity of the alignment…
A symmetric binary mixture containing mobile nanoscale rods is quenched from a one-phase state into an unstable phase-separating region. Incorporating the motion of rods, the system undergoes spinodal decomposition to form a dropletlike structure. The rod-rod interaction and the preferential adsorption of one of the t…
A doubly symmetric electrostatic corrector which compensates for the axial chromatic and the axial third-order aberration of charged-particle lenses is outlined. Due to the double symmetry the corrector does not introduce linear off-axis aberrations and yields in combination with a round objective lens an electron-opt…
Structural models obtained using classical molecular dynamics (MD) simulations and realistic interatomic potentials for solid metals are tested using experimental results obtained by x-ray absorption spectroscopy (XAS). Accurate L-edge extended x-ray absorption fine-structure (EXAFS) measurements of Pb grains disperse…
Gd 2 SiO 5 is among the interesting and suitable hosts for Er 3+ which find extensive applications in the infrared, visible and ultraviolet spectral regions. In order to investigate its potentialities, a prior study of the spectroscopic behaviour of Er 3+ substituting for Gd 3+ ions in the two crystallographic sites o…
The anisotropic thermal expansion of BiB3O6 (BIBO) has been studied in the temperature range 25 °C to 299.5 °C. The three values of principal expansion coefficients α1, α2, and α3 and the orientation of the principal axes are −26.43×10−6 K−1, 50.4×10−6 K−1, 8.53×10−6 K−1, and 8.9°, respectively. Large anisotropic ther…