Materials Literature
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The publications on low-molecular thermotropic liquid crystals with cholesteric structures have been reviewed. The effect of an applied electric field on cholesteric structures is studied. Bistability of the cholesteric-nematic transition, electric field-induced color textures of cholesteric mixtures, and electro-opti…
Two putative Methanococcus jannaschii isocitrate dehydrogenase genes, MJ1596 and MJ0720, were cloned and overexpressed in Escherichia coli, and their gene products were tested for the ability to catalyze the NAD- and NADP-dependent oxidative decarboxylation of DL-threo-3-isopropylmalic acid, threo-isocitrate, erythro-…
The compositional design of Pb(Zr, Ti)O 3 –Pb(Ni, Nb)O 3 ceramics to lower the sintering temperature and improve their piezoelectric properties was investigated. The nonstoichiometric composition containing excess NiO or PbO and NiO can be densified at 800°C. The excess NiO composition can be fabricated in the firing…
Broken-symmetry density functional theory shows that there is no intrinsic link between the change in structure and the change in spin state shown by [(Cp*RuCl)2(μ-Cl)2]. The bistability observed in this complex should therefore be regarded as an example of bond-stretch isomerism, rather than spin-state isomerism [Eq.…
Phosphorus (P) forms in soils determine the amount of P available for crops and the potential for this element to be released to water. Sequential chemical fractionation can provide some information about major P forms in soils, and allow one to distinguish iron (Fe)‐related phosphorus from calcium (Ca)‐bound P. The 3…
The electronic structure of ${\mathrm{La}}_{7/8}{\mathrm{Sr}}_{1/8}{\mathrm{MnO}}_{3}$ was studied by using the rotation-invariant LSDA (local spin density approximation)+U formalism. We found the specific kind of charge and orbital order for ferromagnetic insulating solution in a $2a\ifmmode\times\else\texttimes\fi{}…
meso-Alkylporphyrinogen-like cyclic oligomers containing furans and pyrroles have been synthesized by "3 + 2" and "4 + 2" approaches. Condensation of 5,5,10,10,15,15-hexaethyl-21, 22-dioxatetrapyrromethane with 2,5-bis[(alpha-hydroxy-alpha, alpha-dimethyl)furan] resulted in the formation of cyclic hexamer and cyclic d…
The specific self-assembly of Si/SiOx core–shell nanoparticles onto UV/ozone micropatterned poly(dimethylsiloxane) (PDMS) films is reported here. Auger and Raman spectroscopic mapping document the preferential Si/SiOx nanoparticle adsorption within PDMS domains (see Figure). These nanoparticles display a high refracti…
Hot filament chemical vapor deposition using hexafluoropropylene oxide as the precursor gas yielded two sets of fluorocarbon films, one with varying OH/COOH content and the other with varying grain aspect ratio, as revealed by Fourier transform infrared spectroscopy and atomic force microscopy, respectively. Variable…
A bending beam technique has been developed for on-wafer characterization of thermomechanical properties of dielectric thin films including Young’s modulus (E), the coefficient of thermal expansion (CTE), and the Poisson ratio (ν). The biaxial modulus E/(1−ν) and CTE were determined by measuring the thermal stresses o…
This paper deals with two series of novel side-group liquid crystalline polymers containing coumarin (2H-1-benzopyran-2-one) moieties. Several kinds of polymethacrylates of Series I (Fig. 1) containing a 7-benzoyloxycoumarin unit in the side group with or without substituent at 3 or 4 position of coumarin ring were pr…
Abstract The effects of glass bead filler content and surface treatment of the glass with a silane coupling agent on the room temperature impact fracture behavior of polypropylene (PP)/ethylene‐propylene‐diene monomer copolymer (EPDM)/glass bead(GB) ternary composites were determined. The volume fraction of EPDM was k…
The crystal structure of Bi-layered perovskite Sr 0.85 Bi 2.1 Ta 2 O 9 was determined at 750 K by X-ray Rietveld analysis. Sr 0.85 Bi 2.1 Ta 2 O 9 with space group A2 1 am at room temperature transforms to the paraelectric phase above 670 K, passing through a probable intermediate state at 510 K. Assuming two possible…
The use of porous anodic alumina as a contact mask for ion-milling is demonstrated here to produce highly regular periodic arrays of nano-holes or bosses in an aluminum surface. The interaction of the molten aluminum with the alumina can be either wetting or non-wetting, according to the temperature of the melt, resul…
The tensile strength of ferritic-martensitic HCr-0.5Mo-2W, Nb, V stainless steel (PNC-FMS), which had been developed for core component applications in LMFBR by Japan Nuclear Cycle Development Institute, was evaluated for the effects of thermal aging, sodium exposure, and neutron irradiation. The tensile strength of t…
A detailed examination of a magnesium alloy, AZ91D, in as cast condition was carried out by using electron microscopy techniques. Particles of Al17Mg12, known as β and Al8Mn5 precipitates have been identified by electron diffraction. It was found that Al8Mn5 particles adopted coarse angular shapes, while β phase exist…
Emeraldine base has been doped with the sulfonated calixarene host species, calix[4]- p -tetrasulfonic and calix[6]- p -hexasulfonic acid in water or DMSO solvents, yielding novel colloidal conducting emeraldine salts PAn.calix[4]SO 3 H and PAn.calix[6]SO 3 H. The colloidal polyaniline products were characterized by U…
Copper tubing used in potable water plumbing systems occasionally experiences reactions that lead to the release of copper corrosion by-products into the water. The main factor controlling microbiologically influenced corrosion (MIC) of copper has been identified as a decrease in pH, which in conjunction with the inco…
By means of differential scanning calorimetry, the influences of AClyn® on the crystallization of poly(ethylene terephthalate) (PET) were investigated and compared with Surlyn®. AClyn initiates heterogeneous nucleation and substantially increases the crystallization rate of PET while Surlyn dissolves in molten PET and…
A phenomenological continuum model for computational use has been developed to describe large amplitude transient wave propagation in heterogeneous multi-component materials. A key feature of the model is a physics-based treatment of the continuum response of microstructural components with markedly dissimilar elastic…