Materials Literature
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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…
At room temperature, polycrystalline Fe 3 O 4 films with thicknesses in the range 5–1120 nm have been prepared by reactive sputtering. Transmission electron microscopy imaging shows that uniform Fe 3 O 4 grains are well separated by grain boundaries and their size decreases with film thickness. The change of resistivi…
Abstract The influence of different processing methods on the nature of the dispersion achieved in the creation of a polyurethane nanocomposite is presented. The nanocomposites were produced using two different types of organically modified montmorillonite clays and a sample of fine particles of silicon nitride as a r…
Temperature-dependent 1 H NMR and dilute solution viscometry coupled with dynamic light scattering techniques were used to elucidate the aqueous phase conformation of several poly(vinyl alcohol)s (PVAs) differing in their molecular architecture (i.e., degree of blockiness, molecular weight, and degree of hydrolysis).…
We developed a CVD system employing inductively coupled micronplasma generated by applying UHF (UHF microplasma). This system can be operated easily in air at atmospheric pressure with a few tens of watts of UHF power and enables us to deposit material on a wide variety of substrates. Deposition of carbon from CH 4 /A…
PMMA/Pd nanocomposites were prepared by means of free radical polymerization of methyl methacrylate using AIBN initiator in the presence of palladium acetate at 50 °C (48 h), and subsequent thermal conversion of palladium acetate into palladium metal at 120 °C (1 h). Morphological, thermomechanical, and thermal proper…
A polyelectrolyte architecture was fabricated that was composed of chitosan and organophosphorus hydrolase polycations along with thioglycolic acid-capped CdSe quantum dots (QDs) as the polyanion. This film was imaged by epifluorescence microscopy. UV−vis and emission spectroscopies were used to monitor the growth of…
Abstract The first part of this investigation focused on the synthesis and characterization of a new type of intumescent flame‐retardant (IFR) agent. Four steps were used in the synthesis process. The structure was characterized by FTIR, magic‐angle spinning nuclear magnetic resonance (MAS‐NMR) 13 C spectroscopy, and…
PURPOSE: The purpose of this study was to compare contrast enhanced MR angiography (MRA) with gadopentetate dimeglumine (Gd-DTPA) to MRA with gadobenate dimeglumine (Gd-BOPTA), a high relaxivity paramagnetic contrast agent. MATERIALS AND METHODS: Twelve patients referred for carotid artery stenosis were examined with…