Materials Literature
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Polarization effects are studied in surface-enhanced resonant Raman scattering (SERRS) experiments on single-wall carbon nanotubes (SWNT's) in contact with silver colloidal clusters. For metallic SWNT's the very low depolarization ratio of the G band observed in normal resonant Raman scattering (RRS) is nearly complet…
Ionomers (AClyn® Na, and AClyn® Zn) were used as nucleating additives, and their effect on crystallization of poly(ethylene terephthalate) (PET) was investigated by using differential scanning calorimetry (DSC). The results showed that the crystallization rate of PET is accelerated by both ionomers, and the ionomer co…
Diamond-like carbon (DLC) films were prepared with mass-selected C+, CH2+, CH3+, and CH4+ ions, and the dependence of film microstructures and properties on ion species was investigated with micro-Raman spectroscopy, optical band gap measurement and atomic force microscopy (AFM). The results indicate that highly sp3 b…
Impedance spectra of Co-doped NASICON polycrystalline samples (x = 2.0) were measured in the frequency range 0.5 MHz–1.2 GHz and analyzed in terms of the conductivity dispersion. The dispersion of bulk electrical conductivity obeys the power law frequency dependence σ(ω) = σ0 + Kωn. It is observed from room temperatur…
We investigated the characteristics of Y2O3 films grown on an oxidized Si(111) surface, using x-ray diffraction, Rutherford backscattering spectroscopy, and high-resolution transmission electron microscopy. The films grown on the oxidized Si show drastically improved crystallinity, compared with the film grown on clea…
Carbon nitride films were deposited by pulsed Nd:yttrium–aluminum–garnet laser ablation of graphite with assistance of low energy nitrogen-ion-beam bombardment. The nitrogen to carbon (N/C) atomic ratio, surface morphology, bonding state, and microstructure of the deposited carbon nitride films were characterized by x…
Normally synthetic well defined monodisperse discotic laponite clays are known to form a gel phase at mass concentrations as low as a few percent in distilled water. Hydrosoluble polymer polyethylene oxide was added to this intriguing clay system, it was observed that it either prevents gelation or slows it down extre…
The reaction of [Mn 3 O(2-X-benzoato) 6 L 3 ] (X = Cl, Br; L = pyridine) with 2,2‘-bipyridine in CH 2 Cl 2 leads to the high-yield formation of new mixed-valence tetranuclear Mn I I Mn 3 III complexes of general formulation [Mn 4 O 2 (X-benzoato) 7 (bpy) 2 ] ( 1, X = 2-chloro; 2, X = 2-bromo). The crystal structure of…
Chemisorption and thermal behavior of CO and NO on Pd{110} and its vicinal surface, Pd{320} [Pd(S)[3(110)×(100)]], have been investigated using molecular beam surface scattering (MBSS), temperature programmed desorption (TPD), low energy electron diffraction (LEED), and ultraviolet photoelectron spectroscopy (UPS). CO…
We show that a rich variety of crystalline structures, and a corresponding diversity of the associated phase diagrams, result from the presence in the pair potential of a soft repulsion in addition to a hard core. We use different forms for the soft repulsion, and show that the results are sensitive to the details of…
Abstract This paper describes the structure and electrical performance of PTC/NTC (positive temperature coefficient/negative temperature coefficient) effects and their reproducibility upon healing/cooling cycles. The following three‐component blends were studied: PVDF/UHMWPE/CB, PVDF/XL‐UHMWPE/CB and γ‐irradiated comp…
We consider the application of the Bragg-Pippard (BP) equations for form birefringence to a tilted-columnar biaxial thin film with columns of index n(c) and voids of known index n(v). In such a situation the three forward BP equations that express the principal refractive indices n1, n2, and n3 as functions of n(c), n…
Theoretical calculations based on phenomenology of ferroelectrics have been previously reported for lead zirconium titanate (PZT) system. This paper offers an experimental comparison of the crystal orientation dependence of dielectric properties for PZT thin films grown using reactive RF-sputtering. Highly oriented PZ…
Abstract The properties of polymer blends are largely determined by the morphological structure of the polymer combinations that are involved. In terms of extruder design, this means it is necessary to have models available for estimating the development of the morphology over the length of the screws. Since significa…
Pyrimidine bases are rapidly catabolized in growing plant tissues. The final enzyme of the catabolic pathway, beta-ureidopropionase (beta-UP; EC 3.5.1.6), was partially purified from the shoots of etiolated maize (Zea mays) seedlings. The enzyme had a K(m) for beta-ureidopropionate (the substrate derived from uracil)…
Intercalation complexes of the fluorescent dye coumarin and lamellar aluminosilicate hectorite have been prepared and studied. The nanocomplexes are characterized by molecular order and thermal stability. Optical quality films of multilayered nanocomposites of coumarin and hectorite were prepared by a layer-by-layer s…
The constitutional marriage between a classical thermotropic discotic molecule and carbohydrate-based amphiphiles (e.g., see Figure) is shown to result in hybrid compounds, where, for example, a triphenylene unit serves as the central core from which oligomethyleneoxy chains terminated with sugar residues radiate, whi…
Abstract We review recent attempts to elucidate the phenomenon of sonoluminescence in terms of fundamental principles. We focus mainly on the processes which generate the light, but other relevant facts, such as the bubble dynamics, must also be considered for the understanding of the physics involved. Our emphasis is…
The repressor proteins of the LacI/GalR family exhibit significant similarity in their secondary and tertiary structures despite less than 35% identity in their primary sequences. Furthermore, the core domains of these oligomeric repressors, which mediate dimerization, are homologous with the monomeric periplasmic bin…
A Green's function formalism is used to calculate self-consistently the temperature dependence of the layer polarization and the thickness dependence of the Curie temperature of thin ferroelectric transverse Ising films in the ferroelectric phase, T ≤ Tc.