Materials Literature
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A Raman study of natural magnetite has been performed at high pressure up to 20 GPa. Upon compression, the vibrational spectra do not exhibit any changes, except for the continuous shift to higher frequencies. Vibrational modeling of the specific heat and entropy based on the modified Kieffer’s model allowed the estim…
Ferromagnetic nodules of the stoichiometric alloy Ni 2 MnGa were obtained by the electrochemical reduction of a suitable mixture of nickel, manganese, and gallium oxide powders in molten calcium chloride. The product exhibits ferromagnetic shape memory properties ready to be used in a composite capable of enduring hig…
Cu 2 O (cuprite) films were deposited electrochemically onto InP (001) single-crystal substrates from aqueous solutions at room temperature. X-ray diffraction indicates a unique epitaxial 45°[001] orientation relationship between Cu2O and InP. This reduces the mismatch between corresponding spacings to 2.9%, compared…
The contact behavior of various metals on n-type nitrogen-doped ultrananocrystalline diamond (UNCD) thin films has been investigated. The influences of the following parameters on the current–voltage characteristics of the contacts are presented: (1) electronegativity and work function of various metals, (2) an oxidiz…
We have calculated the effects of dielectric hole burning on the basis of the frequency dependent dielectric relaxation ε̂(ω) and specific heat ĉp(ω) of glycerol and assuming heterogeneous dynamics where the dielectric and thermal relaxation times are correlated quantities. The heat generated in the sample is determin…
Abstract The effect of the vulcanizing system on the mechanical properties of butyl rubber/ethylene propylene diene monomer–general purpose furnace black–(GPF) blends was studied with static and dynamic mechanical measurements for these blends. The classical theory of elasticity was applied to show the mechanical beha…
Abstract In preceding investigations the overall rate and apparent activation energy for the vulcanization process were calculated for natural rubber compounds, assuming that vulcanization follows first‐order kinetics. It was observed that the addition of white rice husk ash (WRHA) increased the rate of crosslinking a…
The evolution of microstructure and dynamics of a colloidal suspension transforming from hard-sphere to sticky hard-sphere system is investigated by small-angle x-ray scattering techniques. The colloidal system comprised of sterically stabilized silica particles suspended in a marginal solvent. The repulsive to attrac…
We have investigated the stimulated resonance Raman scattering from single crystals of a thiophene/phenylene co-oligomer. The very narrow lines [full width at half maximum (FWHM)=11–20 cm−1] are observed in the same spectral regions where the spectrally narrowed emissions (FWHM≈300 cm−1) occur upon excitation with int…
Brillouin scattering has been used to measure the dynamic structure factor of glycerol as a function of temperature from the high temperature liquid to the glassy state. Our investigation aims at understanding the number and the nature of the relaxation processes active in this prototype glass forming system in the hi…
We propose a concept of fabricating a liquid-crystal (LC) polarization beamsplitter based on binary phase gratings. The binary grating phenomenon in the LC layer physically originates from two different interfacial interactions at periodically alternating domain boundaries. The periodic LC domains are produced by empl…
Part I: Pharmacological Considerations for Drug Delivery Systems in Cancer Medicine Systemically Administered Drugs Reginald B. Ewesuedo and Mark J. Ratain Regional Administration of Antineoplastic Drugs Maurie Markman Theoretical Analyses and Simulations of Anticancer Drug Delivery Ardith W. El-Kareh and Timothy W. S…
Whole-profile-fitting least-squares techniques are applied to simulated and experimental X-ray diffraction patterns of monatomic face-centred cubic (f.c.c.)-derived non-crystallographic nanoclusters to extract structure and size information. Three main structure types have been considered (cuboctahedral, icosahedral a…
An efficient and accurate method to evaluate the theoretical diffraction peak profiles from spherical crystallites with lognormal size distribution (SLN profile) is presented. Precise results can be obtained typically by an eight-term numerical integral for any values of the parameters, by applying an appropriate subs…
We report the fabrication of stable wide-band-gap (∼6 eV) ZnO/MgO multilayer thin films using pulsed-laser deposition on c-plane Al2O3 substrates. The thickness of ZnO layers was varied in the range of 0.75–2.5 nm inside the MgO host with a constant MgO thickness of 1 nm. With a decrease in the thickness of ZnO sublay…
Abstract Poly(ϵ‐caprolactone) (PCL) with different molecular weight were crosslinked by γ‐radiation. The radiation crosslinking features were analyzed by Soxhlet extraction with toluene and the Charlesby–Pinner equation. The crosslinking degree is relative to molecular weight and radiation dose; the relation between s…
Water, one of the most popular species in our planet, can play a catalytic role in many reactions, including reactions in heterogeneous catalysis. In a recent experimental work, Bergeld, Kasemo, and Chakarov demonstrated that water is able to promote CO oxidation under low temperatures (∼200 K). In this study, we choo…
The polymorphs that constitute most Portland cements have been synthesized: tricalcium silicate, dicalcium silicate, aluminate, ferrite, gypsum, bassanite and calcite. They have been used to prepare artificial mixtures, i.e. white Portland clinker, grey Portland clinker and two types of grey Portland cements. Quantita…
Large-quantity (grams) one-dimensional ZnO nanowires of different sizes have been synthesized by a simple thermal evaporation of ZnO powder in a tube furnace at a temperature controlled to 1000–1200 °C and pressure to 1–2 Torr air. A mixture of ZnO and graphite powder was used as the source. Fine graphite flakes were…
A modification of the ground state of the classical-spin Heisenberg Hamiltonian in the presence of a weak superstructural distortion of an otherwise Bravais lattice is examined. It is shown that a slight modulation of the crystal lattice with wavevector $\bQ_c$ results in a corresponding modulation of the exchange int…