Materials Literature
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The self-assembly of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (TPyP) on Au(111) electrodes was investigated. The adlayer structure was found to depend on the electrode potential. At positive potentials (>0.5V(SCE)), a disordered layer of TPyP is formed on the Au(111) electrode. STM images showed that the disordere…
The coordination−insertion ring-opening polymerization of ε-caprolactone was initiated from amine or hydroxyl groups spread over the surface of silica (ca. 30 nm) or cadmium sulfide (ca. 1.5 nm) nanoparticles, respectively. The initiation selectively occurred from the surface functional groups after activation into al…
The structure and chemistry of the $a[100]$ edge-dislocation core in ${\mathrm{SrTiO}}_{3}$ was investigated by high-resolution transmission electron microscopy and electron-energy-loss spectroscopy. The dislocation core is found to be compact, with only a slight dissociation on the {100} plane. This indicates that th…
Abstract The effect of nucleating agents on the crystallization behavior of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) was studied. A differential scanning calorimeter was used to monitor the energy of the crystallization process from the melt and melting behavior. During the crystallization process from the…
The mechanical stability of SBA-15 mesoporous silicas has been assessed using powder X-ray diffraction; nitrogen, benzene, and n -heptane adsorption; and mercury porosimetry. SBA-15 was found to possess rather low mechanical stability as compared to other mesoporous materials, viz., MCM-41 and MCM-48. These results ca…
PREFACE.I: BASIC THERMODYNAMICS.1. Energy and the First Law of Thermodynamics.1.1. Fundamental Concepts.1.2. The First Law of Thermodynamics.1.3. The Enthalpy.2. The Entropy Concept.2.1. The Entropy Defined.2.2. The Second Law of Thermodynamics.2.3. Applications of the Entropy Concept.3. The Free Energy.3.1. Propertie…
Magnetic properties of high-quality Al-free nonsuperconducting GdBa_2Cu_3O_{6+y} single crystals grown by flux method have been studied. The magnetic anisotropy below the Néel temperature T_N~2.3K corresponds to the direction of Gd^{3+} magnetic moments along the tetragonal c-axis. At T < T_N clear indications of spin…
Quasicrystals can carry, in addition to the classical phonon displacement field, a phason displacement field, which requires a generalized theory of elasticity. In this paper, the third-order strain invariants (including phason strain) of icosahedral quasicrystals are determined. They are connected with 20 independent…
In this study, we examine the dynamics of a one-dimensional Frenkel-Kontorova chain consisting of nanosize clusters (the ''particles'') and photochromic molecules (the ''bonds''), and being subjected to a periodic substrate potential. Whether the whole chain should be running or be locked depends on both the frequency…
A first-principles disordered local moment (DLM) picture within the local-spin-density and coherent potential approximations (LSDA+CPA) of the actinides is presented. The parameter free theory gives an accurate description of bond lengths and bulk modulus. The case of $δ$-Pu is studied in particular and the calculated…
Polycrystalline samples of LiBC compounds, which were predicted as possible candidate for high-Tc superconductivity, have been synthesised by a flux method and investigated by means of electrical resistivity and magnetic susceptibility. Scanning electron microscopy and X-ray diffraction patterns showed a plate-like mo…
We report experimental evidence of the existence of two variants of the ${E}_{\ensuremath{\gamma}}^{\ensuremath{'}}$ centers induced in silica by \ensuremath{\gamma} rays at room temperature. The two variants are distinguishable by the fine features of their line shapes in paramagnetic resonance spectra. These feature…
We give a brief review of some generalized continuum theories applied to the crystals with complicated microscopic structure. Three different ways of generalization of the classical elasticity theory are discussed. One is the high-gradient theory, another is the micropolar type theory and the third one is the many-fie…
To characterize porous media, use is often made of the Lucas−Washburn equation, which relates the rate of capillary penetration of a given liquid to an effective cylindrical pore radius and the contact angle between the liquid and the medium. Here, we extend previous large-scale molecular dynamics simulations develope…
This letter describes the preparation, characterization, material properties, and biodegradability of polylactide (PLA)-layered silicate nanocomposite. Montmorillonite modified with trimethyl octadecylammonium cation was used as an organically modified layered silicate (OMLS) for the nanocomposite preparation. WAXD an…
The structural, electronic, and magnetic properties of ${\mathrm{Co}}_{2}\mathrm{Mn}X$ $(X=\mathrm{Si},$ Ge, Sn) Heusler compounds have been determined by means of all-electron full-potential linearized augmented plane wave (FLAPW) calculations. We focus on the effects on the electronic and magnetic properties induced…
The structure of poly(l-lysine) (PLL)/hyaluronan (HA) polyelectrolyte multilayers formed by electrostatic self-assembly is studied by using confocal laser scanning microscopy, quartz crystal microbalance, and optical waveguide lightmode spectroscopy. These films exhibit an exponential growth regime where the thickness…
Birds in a cage: The highly absorbent nitrogen-rich compounds SrN and SrN2 hide their secrets from Raman scattering experiments, but when observed using inelastic neutron scattering, the dinitrogen can be shown to lie trapped within a cage of strontium atoms. Such a structure is shown in the graphic for SrN2, in which…
The alpha relaxation process of the fragile glass former salol is investigated in the T-P domain by means of photon correlation spectroscopy. We find that a time-pressure superposition principle is obeyed for the relaxation function in addition to the time-temperature superposition. The behavior of the relaxation time…
Dendrite morphology and evolution during coarsening is examined by the authors using measurements of the three-dimensional microstructure. Such experiments are made possible by recent progress in serial-sectioning techniques. The dendrite-matrix interface is characterized by the local interfacial curvature, which in t…