Materials Literature
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Abstract The present work revealed that the chemical polymerization of ortho ‐ethoxyaniline yields two types of polymers not only with different spectroscopic properties but also with different molecular weights: (1) a green form, which corresponds to the high molecular weight fraction of the polymer with a molecular…
Abstract Carbon fiber (CF) filled low‐density polyethylene (LDPE) composites were prepared by the conventional melt‐mixing method. The distribution of CF in the composite was studied by wide‐angle X‐ray diffraction (WAXD) and scanning electron microscope (SEM) observations. A phenomenological model was proposed to ill…
Abstract A detailed study of the novel melt transetherification polycondensation process, which was recently developed in our laboratory, is presented. The efficacy of different catalysts, such as p ‐toluenesulfonic acid (PTSA), camphorsulfonic acid, and their pyridinium salts, was examined. The pyridinium salts, espe…
Raman spectra of ${\mathrm{C}}_{60}$ and ${\mathrm{C}}_{70}$ encapsulated in single-wall carbon nanotubes (so-called peapods) were measured at different excitation wavelengths in the range 458--568 nm and at hydrostatic pressure up to 9 GPa. We present the excitation profiles for some intense high-frequency peaks of $…
Abstract Four kinds of polyaniline (PANI)‐coated glass fibers (GF–PANI) combined with bulk PANI particles were synthesized. GF–PANI fillers containing different PANI contents were incorporated into an epoxy–anhydride system. The best conductivity behavior of the epoxy/GF–PANI composites was obtained with a GF–PANI fil…
Depletion forces in homogeneous and inhomogeneous binary colloidal mixtures in two dimensions are accounted for by a theoretical approach based on a contraction of the description of liquid mixtures, as well as by computer simulations. We study the depletion interactions in concentrated binary mixtures of additive and…
The crystal structure of a ternary complex of the alcohol dehydrogenase from the archaeon Sulfolobus solfataricus (SsADH) has been determined at 2.3 A. The asymmetric unit contains a dimer with a NADH and a 2-ethoxyethanol molecule bound to each subunit. The comparison with the apo structure of the enzyme reveals that…
We have used a microscopic lattice dynamical model to study phonon modes in germanium (Ge) NC with size varying between 47 to 7289 atoms $(\mathrm{diameter}\ensuremath{\sim}6.8\mathrm{nm}).$ By separating these atoms into bulk and surface atoms we have found that surface modes can exist in Ge NC both at low frequencie…
During recent years, the understanding of the modification of the structure and dynamics of water confined in different environments has been the focus of much interest in scientific research. This topic is in fact of great relevance in a lot of technological areas and, in living systems, essential water-related pheno…
The multidimensional potential-energy “landscape” formalism offers useful insights into the properties of supercooled liquids and glasses. However, its mathematical fundamentals present formidable subtlety and complexity. In the interests of developing a useful approximation for the statistical mechanics of landscapes…
A variation of A−B−A-type triblock copolymers consisting of poly( l -lactide) (PLLA) and poly(ethylene glycol) (PEG) was synthesized and examined for complexation with α-cyclodextrins (α-CDs). Although the PLLA block has bulky methyl groups as side chains, stable polypseudorotaxanes of PLLA−PEG−PLLA triblock copolymer…
Ferroelectric domain walls are atomically thin, and consequently their dynamics are sensitive to the periodic potential of the underlying lattice. Despite their central role in domain dynamics, lattice-scale effects have never been directly observed. We investigate local domain dynamics in thin film ferroelectrics usi…
We have synthesized and characterized polycrystalline $n$- and $p$-type ${\mathrm{CoGe}}_{1.5}{\mathrm{Se}}_{1.5},$ a member of the class of compounds with the skutterudite crystal structure. Both specimens have large room temperature Seebeck coefficients and resistivities. The carrier type depends very sensitively on…
We analyze how the interaction between two hydrophobic surfaces in water depends on the amount of dissolved gas. At equilibrium there is, for a truly hydrophobic surface with contact angle θ > 90°, a long range attractive force. The attraction is due to the formation of a gaseous film between the surfaces. For a compl…
The interaction of NO with the stoichiometric RuO 2 (110) surface, exposing coordinatively unsaturated Ru-cus and O-bridge atoms, was studied by thermal desorption spectroscopy (TDS) and high-resolution electron energy loss spectroscopy (HREELS). At low exposure (≤0.5 L) and 85 K, NO is adsorbed on-top of Ru-cus with…
Abstract Polystyrene‐clay nanocomposite (PsCN) materials were synthesized and their properties of crystallinity, thermal behavior, and dielectric characteristics were investigated. A polymerizable cationic surfactant, [2‐(dimethylamino)ethyl]triphenylphonium bromide, was used for the intercalation of montmorillonite (…
The structural transformations occurring in fibers of syndiotactic polypropylene (sPP) during stretching have been studied by wide-angle X-ray diffraction measurements, using syncrotron radiation. sPP samples were cyclically stretched and relaxed at controlled rate, while recording X-ray fiber diffraction patterns and…
Fragmentation of the SF6 molecule upon F 1s excitation has been studied by resonant photoemission. The F atomiclike Auger line exhibits the characteristic Doppler profile that depends on the direction of the photoelectron momentum relative to the polarization vector of the radiation as well as on the photon energy. Th…
Highly ordered, several nanometers thick films of alkylated large planar, polycyclic aromatic hydrocarbon (PAH) molecules have been grown on semi-metallic molybdenum disulfide substrates. The films are characterized by a two-dimensional lateral arrangement of columns standing at the surface on a macroscopic scale. The…
Sequential structure-factor data have been collected during the transformation from relaxed high-density to low-density amorphous ice at temperatures above 105 K. Trends in the measured structure factor and in particular the height of the first sharp diffraction peak as a function of its position show that, at ambient…