Materials Literature
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This work deals with the investigation of the conditions under which a spontaneous degradation municipal waste plastic containing poly(vinyl chloride) (PVC) occurs during the dechlorination on an experimental scale by batch operation using a glass reactor, paying particular attention to the gas−solid reaction between…
The structure factor, viscosity, and diffusivity of four (styrene- b -isoprene- b -styrene- b -isoprene) tetrablock copolymers have been examined as functions of temperature ( T ). The copolymers have styrene compositions ( f ) of 23, 42, 60, and 80 vol % and total degrees of polymerization ca. 120; polystyrene and po…
Thermal degradation of poly(vinyl chloride) has been studied in the presence of metal oxides by a thermogravimetric method. It follows a two-step mechanism. In the first step chlorine free radical is formed as in the case of pure PVC, and in the second step chlorine free radical replaces oxygen from metal oxide to for…
The presence/absence of a Berry phase depends on the topology of the manifold of dynamical Jahn-Teller potential minima. We describe in detail the relation between these topological properties and the way the lowest two adiabatic potential surfaces get locally degenerate. We illustrate our arguments through spherical…
Hartree-Fock and coupled-cluster calculations have been performed for cubic AgCl and for AuCl having a cubic or the observed structure with space group I4_1/amd. Cohesive energies and lattice constants are in excellent agreement with experiment for AgCl; for AuCl we find good agreement, and the experimental structure…
The change in potential during repassivation of titanium in artificial bioliquids was examined, and the regenerated surface oxide film on titanium was characterized using X-ray photoelectron spectroscopy and Auger electron spectroscopy to elucidate the repassivation reaction of titanium in a biological system. The rep…
Lattice modulations induced by magnetic structures in Ho have been studied by X-ray diffraction under magnetic field in a temperature range between 30 K and 110 K. Several satellite reflections caused by the lattice modulations have been observed along the c * -axis only in a helifan phase. The range of the helifan ph…
The time of flight technique is used to study experimentally the charge-carrier transport in porous silicon. The measured drift mobilities of electrons and holes show a decrease with the reduction of the typical size of structural elements of the porous material. The experimental transient characteristics reveal a str…
Single crystals of 1% ${\mathrm{Er}}^{3+}$-doped ${\mathrm{Cs}}_{3}{\mathrm{Lu}}_{2}{\mathrm{Cl}}_{9}$ were grown using the Bridgman technique. From highly resolved polarized absorption spectra measured at 10 and 16 K, and upconversion luminescence and excitation spectra measured at 4.2 K, 114 crystal-field levels fro…
The Raman scattering spectra of amorphous porous silicon are investigated. It is found that the so-called boson peak in the acoustical part of the Raman spectra is more sensitive to the degree of structural disorder than the optical mode, which is normally used to determine the latter. This can be explained by the fac…
The synthesis and magnetic and magnetoelastic properties of PrxTb1−xFe2 and Pr0.15TbxDy0.85−xFe2 are reported. The study on the crystalline structure, magnetization, and Curie temperature shows that PrFe2 has a lattice parameter of 7.463 Å and a magnetic moment of 4.93 μB/f.u. With the addition of Pr, the anisotropy o…
Adiabatic potentials, energy levels and wavefunctions for collective vibrational states of hydrogen isotopes in monohydrides of transition metals with face-centred cubic lattices, and NiH, and with body-centred cubic lattices, and CrH, are investigated by means of ab initio total-energy calculations in the local densi…
The Lyman spectrum of substitutional boron acceptors in diamonds with natural composition and that in a ${}^{13}\mathrm{C}$ diamond exhibit remarkably similar features, but shifted to higher energies in the latter by 0.4--1.5 meV. Additional lines appear when the spectra are recorded as a function of temperature, indi…
Electron energy loss spectroscopy in a high-resolution transmission electron microscope has recently been used with success to characterize the electronic properties of closed cage nanometer-size graphitic particles. In the plasmon region, the experimental data reveal interesting size-dependent variations, which are n…
For the heteroepitaxial deposition of diamond on silicon using the bias-enhanced nucleation procedure, several different processes contributing to the final misalignment of the layers can be identified: (i) The interface of Si/diamond or Si/SiC and SiC/diamond, respectively. (ii) The growth of individual grains during…
The role of protein and cellular components of thrombi in mediating bacterial adhesion on artificial surfaces was investigated in this study. The attachment of Staphylococcus aureus on polyurethane surfaces was observed directly using an automated video microscopy system. Surfaces were preconditioned with components o…
Transport measurements under pressure and magnetic field on low-doped ${\mathrm{La}}_{0.9}{\mathrm{Sr}}_{0.1}{\mathrm{MnO}}_{3}$ single crystals have clearly evidenced the stabilization of the low-temperature charge ordered state when increasing pressure and field. The observation of a pronounced change of magnetizati…
Magnetoresistance properties of compounds with the same formula La0.7−xGdxCa0.3MnO3+δ (x=0, 0.04) but synthesized by the solid-state reaction method from different starting materials are studied. Nearly stoichiometric compounds are obtained when La(OH)3 is used for sample preparation. However, under the same condition…
The initial attachment reaction of most cultured cell types to polymers is based on a linkage of integrin receptors to serum-derived fibronectin and vitronectin that adsorb onto the polymer surface. Recently isolated corneal epithelial cells have an additional attachment mechanism, known to operate on tissue culture p…
Dielectric measurements at very low temperature indicate that in the multicomponent glass $\mathrm{BaO}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\ensuremath{-}{\mathrm{SiO}}_{2}$ a phase transition occurs at 5.84 mK. Below that temperature small magnetic fields of the order of $10\ensuremath{\mu}\mathrm{T}$ cause…