Materials Literature
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D. Vorländer was the leading scientist in liquid crystal chemistry in the first half of the 20th century who discovered many of the building principles for liquid crystalline compounds. It was known that Vorländer also synthesized some compounds with a bent molecular shape. In this paper we show that one of these comp…
An investigation of the microstructures of four U–Nb alloys has been conducted. The nominal Nb contents are 5, 9, 13 and 18at.% (approximately 2, 4, 5.5 and 8 wt%). The self-accommodating twin structures have been characterized and considered in terms of the lattice parameters of the martensite phases as well as the t…
Nonequilibrium molecular dynamics (NEMD) simulations play a major role in characterizing the rheological properties of fluids undergoing shear flow. However, all previous studies of flows in molecular fluids either use an “atomic” thermostat which makes incorrect assumptions concerning the streaming velocity of atoms…
In this work, we present experimental studies on the cross-plane thermal conductivity of InAs/AlSb superlattices. The thermal conductivities of MBE-grown InAs/AlSb superlattices are measured using the 3 y method from 80 to 300 K. The influence of the growth temperature and postannealing is investigated. Significant re…
Raw cotton and flax fibers and fabrics contain noncellulosic components such as waxes, pectins, proteins, and hemicelluloses, and major parts of these components are located on the outer surfaces of the fibers. In this work, the surface chemistry of cotton and linen fabrics is analyzed with Electron Spectroscopy for C…
The NdFeB anisotropic bonded magnet produced by the HDDR method, which was developed in 1990, has not found general popularity due to its high cost and low serviceable temperature of 353 K. The authors have developed a new production method that overcomes these barriers to decrease the cost and increase the serviceabl…
Alumina specimens with small amounts of CaO and TiO 2 were prepared and their microstructural evolution during sintering was investigated. Because of the appearance of a liquid phase during sintering, a duplex microstructure of a few abnormal grains and fine matrix grains was obtained when the CaO + TiO 2 content was…
Abstract Recent results are presented demonstrating the application of cross‐sectional analytical transmission electron microscopy (ATEM) to corrosion and cracking in high‐temperature water environments. Microstructural, chemical and crystallographic characterization of buried interfaces at near‐atomic resolutions is…
The magnetic and structural properties of FeCoB thin films as a function of boron content have been investigated for applications requiring soft, high moment materials. The films were either co-sputtered from separate FeCo-35 and B targets or from a (Fe/sub 65/Co/sub 35/)/sub 90/B/sub 10/ alloy target. A peak in the c…
Successful net‐shape sintering offers a significant advantage for producing large or complicated products. Porous Si 3 N 4 ceramics with very low shrinkage were developed, in the present investigation, by the addition of a small amount of carbon. Carbon powders (1–5 vol%) of two types, with different mean particle siz…
The intercalation of a cationic azobenzene derivative into the interlayer space of magadiite has been achieved. The spectral properties as well as the X-ray diffraction results reveal that the adsorbed azo cations form head-to-head aggregates in the interlayer space. The basal spacing of the intercalation compound cha…
Developing cotton (Gossypium hirsutum) fibers, cultured in vitro with their associated ovules, were used to compare the effects of two herbicides that inhibit cellulose synthesis: 2,6-dichlorobenzonitrile (DCB) and an experimental thiatriazine-based herbicide, CGA 325'615. CGA 325'615 in nanomolar concentrations or DC…
Spark plasma sintering (SPS) was applied for preparing dense Ca2.75Gd0.25Co4O9 ceramics, and their thermoelectric properties were investigated from room temperature to 700 °C in air. The SPS process was effective in obtaining dense Ca2.75Gd0.25Co4O9 ceramics, typically 98% of the theoretical x-ray density, with lower…
We consider a model for phase separation of a multi-component alloy with non-smooth free energy and a degenerate mobility matrix. In addition to showing well-posedness and stability bounds for our approximation, we prove convergence in one space dimension. Furthermore an iterative scheme for solving the resulting nonl…
Based on the processing strategy of improving the mechanical properties of liquid‐phase‐sintered materials by modifying the secondary phase chemistry, four rare‐earth oxides (RE 2 O 3 , RE = La, Nd, Y, and Yb), in combination with alumina, were used as sintering aids for a submicrometer‐size β‐SiC powder. Doped with 5…
In this work we investigated the influence of formamide on the acid-catalyzed sol-gel process by Fourier transform infrared spectroscopy (FTIR). Three silica sols were studied: Sol catalyzed with nitric acid without formamide, sol catalyzed with nitric acid containing formamide and sol catalyzed with a mixture of nitr…
Inrush currents are frequently encountered during the switching process of transformers. The purpose of this paper is to present an investigation of forces that appear as a result of inrush currents. While both short circuit and inrush transformer situations might seem identical, they vary significantly from the core…
Cobalt–nickel oxide films of nominal 100 nm thickness, and resistivity on the order of 10−2 Ω cm have been deposited by spin casting from both aqueous and organic precursor solutions followed by annealing at 450 °C in air. Films deposited on sapphire substrates exhibit a refractive index of about 1.7 and are relativel…
The synthesis of ultrafine cerium dioxide (CeO 2 ) powders via mechanochemical reaction and subsequent calcination was studied. Anhydrous CeCl 3 and NaOH powders, along with NaCl diluent, were mechanically milled. A solid‐state displacement reaction—CeCl 3 + 3NaOH → Ce(OH) 3 + 3NaCl—was induced during milling in a ste…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSurface-Initiated Polymerization of l-Lactide: Coating of Solid Substrates with a Biodegradable PolymerInsung S. Choi and Robert LangerView Author Information Department of Chemical Engineering, Massachusetts Institute of Technology…