Materials Literature
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Very large pore hexagonal and cellular foam-like molecular sieve silicas with well cross-linked framework walls (denoted MSU-H and MSU-F, respectively), have been prepared from soluble silicate precursors under neutral pH conditions.
Nanoporous carbon prepared by chlorination of TiC powder has been characterized by high-resolution transmission electron microscopy (HRTEM) and showed a disordered amorphous structure of graphite planes with areas of an onion-like structure, where the graphite planes are ordered with concentric spherical graphitic she…
A unique class of polyurethane (PU) elastomer containing inorganic molecules (polyhedral oligomeric silsesquioxane, POSS) as molecular reinforcement in the hard segment was investigated by means of wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. WAXD results indicate that POSS m…
The paradigm of tissue material interactions, which holds that protein adsorption is the first event following contact and determines the later interactions of cells, is invoked to propose a design strategy for biocompatibility. Control of protein interactions is the key element, and it is suggested that nonspecific p…
Abstract In the Precambrian world, devoid of higher organisms except near its end, carbonate sediments formed by a variety of abiotic and microbial processes, with patterns of deposition determined by tectonic, eustatic, and climatic processes. These ancient rocks demonstrate that the fundamental tenets of carbonate p…
The self-aggregation of Methylene Blue [MB] (1×10−6–4×10−4 M) in water and in aqueous solutions of Bu4NBr (0.1–0.3 M) and urea (0.1–4 M) has been investigated by recording electronic spectra in the wavelength range 550 to 700 nm. Analysis of the spectral data yielded the dimer dissociation constant, and individual cha…
Recently, the two most significant characteristics of power transformer cores, i.e., loss and noise, have been reduced considerably because of improved material and improved core design. An undisputed base value of noise results from magnetostriction (MS) due to the global magnetization of limbs and yokes, whereas exc…
The 1100°C isothermal section and the isopleths at 5, 10, and 15 at.% C in the Ti–Si–C system were determined by DTA and XRD methods. Five invariant reactions (L (liquid) = Si + SiC + TiSi 2 at 1330°C, L = TiSi + TiSi 2 + Ti 5 Si 3 C x at 1485°C, L + Ti 5 Si 3 C x = Ti 3 SiC 2 + TiSi 2 at 1485°C, L + Ti 3 SiC 2 = TiSi…
The release of soluble Cr VI species by a chromate conversion coating (CCC) was monitored quantitatively by ultraviolet‐visible spectroscopy. By careful selection of measurement wavelength (339 nm), the Cr VI concentration could be determined without regard to solution pH or Cr VI speciation. The Cr VI concentration i…
Acid-anodized aluminum forms amorphous alumina with long and columnar nanopores with approximately hexagonal ordering ("alumite"). Excellent hexagonal ordering of these nanopores has been achieved by 24 hours of anodization, but with restricted domain size (2-4 /spl mu/m/sup 2/), which can be increased to 100 /spl mu/…
Plastic materials continue to play a vital and growing role in packaging applications. It is thus more important than ever that all involved in the packaging industry command a basic understanding of the properties of the common packaging plastics. This highly regarded book provides just that to students and packaging…
Deposition processes of chromium (Cr) species for the system chromia‐forming alloy metallic interconnect/Sr‐doped (LSM) electrode/3 mol % (TZ3Y) electrolyte have been investigated under various conditions at 900°C. Deposition of Cr species preferentially occurred on the zirconia electrolyte surface under both cathodic…
The effect of Cu/sup 2+/, Cd/sup 2+/, Co/sup 2+/, Ca/sup 2+/, Mn/sup 2+/, and Mg/sup 2+/ ions on the physical properties of stoichiometric Ni/sub 0.5/Zn/sub 0.5/Fe/sub 2/O/sub 4/ ferrite is investigated. The specimen is prepared by the conventional manufacturing method without atmosphere control. The divalent ions rep…
Permanently charged films with a cellular or porous structure represent a new family of polymer electrets. These materials show piezoelectric properties with high piezoelectric constants. The electromechanical response equations of such films are derived for their operation as sensors and as actuators. Experimental re…
Lyotropic mineral liquid crystals—materials that are generally electron rich, thermally stable, and often inexpensive—are reviewed. Molecular wires, ribbons, and disks as well as anisotropic crystallites are examined and guidelines useful in the search for new mineral liquid-crystalline suspensions are given. The Figu…
The ability to predict or confirm ferroresonance depends primarily on the correctness of the transformer model used by the computer simulation. Ferroresonance is introduced and a general modeling approach is given. An overview of available literature and contributors to this area is provided. A simple ease of ferrores…
Cytochrome P450 is one of Nature’s oxidative workhorses and is utilized in a wide variety of roles, one of the most important being the detoxification of foreign bodies within the liver. As a result of its fundamental importance it has been extensively investigated, modeled and mimicked over the past 30 years, and mor…
Abstract The CoFe 2 O 4 nanoparticles have been synthesized by using a stable ferric salt of FeCl 3 with a micellar microemulsion method. The normal micelles are formed by sodium dodecyl sulfate (NaDS) in aqueous solutions. The mean size of the nanoparticles can be controlled from less than 4 nm to about 10 nm through…
The performance of polyaniline‐based electrochemical capacitors was evaluated under various experimental conditions. The capacitor consisted of two platinized tantalum foils coated with polyaniline as the active material, a separator, and an appropriate aqueous electrolyte solution. The polyaniline coatings were forme…
The hysteresis loop of the core material in a test current transformer is simulated using the Jiles-Atherton theory. Comparisons are made between recorded and simulated waveforms and it is found necessary to replace the modified Langevin function used by Jiles and Atherton. Using an alternative function described in t…