Materials Literature
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Solubility, polymorphism, crystallinity, and crystal habit of acetaminophen and racemic (±)-ibuprofen were determined by initial screening of 23 solvents for scale-up. Solubility curves were constructed, and solubility at 25 °C was plotted against the dielectric constants of various solvent as a fingerprint for solute…
Some of the major dielectric phenomena observed in polymer nanocomposites are explained in terms of a multi-core model proposed by the author. They include characteristics associated with low field conductivity, high field conduction, permittivity, loss tan delta, the threshold field for space charge formation and EL…
Abstract Soils developed on Quaternary fluvial fill terraces in the humid tropics of Costa Rica display progressive changes in mineral assemblage, chemical composition and particle size with age. Clay minerals from B horizons of active floodplains are predominantly smectite with lesser amounts of disordered kaolinite.…
Abstract A novel chemical process for producing hydrophobic nano-copper particles with satisfied antioxidation property is described here. Well-dispersed nano-copper particles with satisfied surface properties were obtained from the water/organic solution. In this process, oleic acid acts as both a phase-transfer agen…
The foaming characteristics of low-molecular-weight emulsifiers (LMWEs) and proteins are important attributes during the production, storage, transport, and consumer perception of quality (appearance) of food dispersions (emulsions and foams). In this article, we consider the analysis of interfacial (adsorption isothe…
An experimental electron density (ED) analysis of the spin crossover coordination complex Fe(btr)(2)(NCS)(2).H(2)O has been performed in the ground low-spin (LS) state and in the metastable thermally quenched high-spin (HS) state at 15 K by fitting a multipolar model to high-resolution X-ray diffraction measurements.…
Improvements in the dielectric properties of composite dielectrics have been previously documented when the filler material used is reduced to nanometric dimensions. While the reasons for this have been traced to the physics and chemistry taking place at the interface, and dramatic changes in the magnitude and dynamic…
Abstract Multiwall carbon nanotubes were observed in a small fraction of soot collected by thermophoretic precipitation from Texas piñon pine wood burning in air. Transmission electron microscopy showed the carbon nanotubes to be aggregated with other fullerene‐like nanoforms and graphite fragments. Copyright © 2006 R…
Abstract Au2S nanoparticles (NPs) were prepared in the cavity of the cage-shaped protein, apoferritin. Apoferritin has a cavity, 7 nm in diameter, and the diameter of fabricated Au2S NPs is about the same size with the cavity and size dispersion was small. Although Au2S is generally insoluble in water, our prepared Au…
The present study investigated stress relaxation in fabrics with increased elasticity. For prediction of the degree of stress relaxation the frequently used mechanical models reported in the literature were analyzed. The mechanical models which were used in this paper were: Maxwell's model, the two-component Maxwell's…
The effects of oxygen vacancy on the dielectric properties of Mg-doped BaTiO 3 were studied as a function of frequency in the temperature range of 150–450 °C. In Ba(Ti 1- x Mg x )O 3- x , the Curie point ( T c ) shifted to lower temperatures as the Mg content ( x ) was increased. Dielectric loss (tan δ) peaks moved to…
It is more important to obtain the sensitivity line, which is defined as a correlation between the ultra-high-frequency (UHF) signal (mV) and apparent charge (pC), for onsite calibration regarding partial discharge (PD). Synchronous measurement of the UHF method and IEC 60270 enables us to obtain the sensitivity line…
The atomic arrangement of lunar merrillite has been refined to R = 0.0452 in R3c using X-ray diffraction data recorded on a CCD detector; previous attempts at structure solution using a point detector were not successful because of the poorly crystallized nature of the lunar material. The atomic arrangement of merrill…
The ubiquitous enzyme dihydrofolate reductase (DHFR) is responsible for the reduction of 5,6-dihydrofolate to 5,6,7,8-tetrahydrofolate in an NADPH-dependent manner. It is also a key pharmacological target for the treatment of cancer, as well as bacterial and opportunistic pathogenic infections. Interest in the design…
Parameters of interaction of hydrogen with magnesium powders and structure of powder magnesium alloys alloyed with different metals and oxides (such as Fe, Ni, Al, Cu, Ti, Pd, NiPd, V 2 O 5 , and VH 2 ) prepared by mechanical activation under either argon or hydrogen atmosphere in a vibration mill have been studied. T…
N-(Porphyrin-2-ylmethyl)glycine was synthesized and used as precursor of azomethine ylide, which was trapped with several dipolarophiles. The reaction of that azomethine ylide with dimethyl fumarate afforded the expected adduct. However, with 1,4-benzo- and 1,4-naphthoquinones only dehydrogenated adducts were isolated…
Crystalline microporous inorganic−organic nanohybrids were synthesized by pillaring layered octosilicate with 1,4-bis(trichlorosilyl)benzene or 1,4-bis(dichloromethylsilyl)benzene. The silylating agents were preferentially bridged between the layers of octosilicate, resulting in the formation of microporous hybrids wi…
Recently there is an increased interest in developing magnetic semiconductors due to their promising applications in spintronics. The semiconductors can be made ferromagnetic by doping with transition-metal ions. In this paper, the results of our studies using x-ray diffraction (XRD) and IR and Raman spectroscopic tec…
Abstract Results on reactive atom plasma etching performed on ULE® (Corning Ultra Low Expansion) glass samples at atmospheric pressure are presented for the first time. A reactive atomic plasma technology (RAPT®), has been developed by RAPT Industries and employed for the finishing of optical surfaces. An atmospheric…
Based on van’t Hoff and Gibbs equations, the thermodynamic functions Gibbs free energy, enthalpy, and entropy of solution, mixing and solvation of naproxen (NAP) in water at pH 1.2 and 7.4, were evaluated from solubility values determined at several temperatures. The solubility at pH 7.4 and 25.0°C was almost 150 time…