Materials Literature
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Cobalt-ferrite nanoparticles of size 10 to 15 nm have been synthesized in water-in-oil microemulsions (i.e., reverse micelles). When the Co/sup 2+//Fe/sup 2+/ molar ratio in the precursor solution reaches 1:1 and above, the resultant oxides are identified as having the cobalt ferrite structure. By increasing the Co/su…
A new photosensitive chiral dopant based on cinnamic acid and isosorbide was synthesised. UV light action leads to E-Z photoisomerization of the dopant about C=C double bond of cinnamoyl fragment. Mixtures of the dopant with nematic and cholestric polymers were studied. It was shown, that planarly-oriented films of mi…
Abstract Benzoic acid was crystallized in a T‐mixer by mixing hydrochloric acid and an aqueous sodium benzoate solution. Crystallization kinetics were determined by population balance modeling and parameter estimation by nonlinear optimization. The evaluation of several models showed that the model has to be carefully…
Abstract Occurrence, chemistry, crystal growth, technical applications, structure and polytypism of xonotlite Ca 6 Si 6 O 17 (OH) 2 are reviewed. Atomic coordinates of the three simplest ordered polytypes in modified Gard notation: Ma 2 bc (space group P 2/ a , a = 17.032, b = 7.363, c = 7.012 Å, β = 90.36°), Ma 2 b 2…
XPS spectra of manganese dioxide (MnO2) powder are presented. The spectra were collected using monochromated Al Kα x-rays. Spectra include survey scan, the Mn 2p, 3p, and 3s regions, the O 1s region, and the Mn LMM Auger transitions.
Single crystal Ni/sub 48/Mn/sub 31/Ga/sub 21/ magnetic shape memory alloy exhibits giant 5% field-induced strain (MSM effect) due to redistribution of martensitic variants. Magnetization of this alloy was studied as a function of field and temperature. Austenite-to-martensite transition occurs at 299 K. At room temper…
The use of clusters as elemental building blocks can open routes toward the fabrication of a new class of nanostructured solids and devices. We report the synthesis of nanostructured films using supersonic cluster beam deposition. A new type of cluster source based on microplasma ablation has been developed. This allo…
The main spectroscopic properties (absorption, emission, decay times) of Pr3+-doped Ca4GdO(BO3)3 (GdCOB) have been determined for the three X, Y, Z polarizations. The Judd–Ofelt analysis, extended to anisotropic crystals, normalized and modified to take into account the influence of the 4f5d lowest energy level, has b…
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…