Materials Literature
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Abstract Polycrystalline samples of perovskite‐structured BaCeO 3 and SrCeO 3 were studied by Raman scattering spectroscopy in the temperature range 77–983 K. Changes in the spectra of BaCeO 3 with temperature are explained in terms of a second‐order phase transition ( D 2 h → D 4 h ) at T 0 = 427 K. Analysis of the t…
Absorption and magnetic circular dichroism (MCD) spectra are reported for the metallophthalocyanine-N-isologs: magnesium-3,4-pyridinoporphrazine (MgPcN 4 (−2)), zinc-3,4-pyridinoporphyrazine (ZnPcN 4 (−2)), and zinc-3,4-pyridazinoporphyrazine (ZnPcN 8 (−2)). Band deconvolution calculations, which couple both the absor…
Solubilized silk fibroin (SF) in 0.1 M borate buffer (pH 9.4) was modified with 2-O-[methoxy(polyethylene glycol)]-4,6-dichloro-s-triazine (actPEG1) at 4 degrees C. The weight of the modified SF (PEG1-SF) was at least 3.2 times that of the starting material SF. Amino acid analysis of PEG1-SF suggested that the nucleop…
Abstract A scanning Raman spectrometer and an Nd: YAG laser operating at 1.06 μm were used to observe the surfaceenhanced Raman scattering (SERS) of pyridine in yellow silver colloids. Enhancement factors for the triangle ring breathing vibration mode at 1006 cm −1 and for the totally symmetric breathing mode at 1036…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of structure and morphology in two poly(ether-block-amide) copolymersGalen R. Hatfield, Yihong Guo, William E. Killinger, Ronald A. Andrejak, and Paul M. RoubicekCite this: Macromolecules 1993, 26, 24, 6350–6353Publication Date (Print):November 1, 1993Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHesperetin 7-O-glucoside and prunin in Citrus species (C. aurantium and C. paradisi). A study of their quantitative distribution in immature fruits and as immediate precursors of neohesperidin and naringin in Citrus aurantiumJulian. Castillo, Obdulio. Benavente, and Jose A.…
Four discotic liquid crystals (LCs) from the hexa-alkoxytriphenylene series (R = C n H2n + 1, n = 5, 7, 9, 11) classified as Dho phases were investigated with respect to their photoconducting properties. Under irradiation, all samples show photoconductivity within the mesophase, whereas in the isotropic phase the phot…
Abstract Studies of the morphology of extruded polymer blend systems have shown that it is feasible to produce a laminar structure of an ethylene vinyl‐alcohol copolymer (EVOH) dispersed phase in a polypropylene (PP) matrix phase. The laminar structure forms in the core of the extrudate when a slit die is incorporated…
A new low molar mass chiral organosiloxane mesogen and its racemic analogue have been synthesized and their mesomorphic and ferroelectric properties investigated. The chiral derivative, denoted A∗B, exhibits one tilted enantiotropic ferroelectric smectic C mesophase over a broad temperature range, with very high tilt…
For a given number of skeletal atoms, the π-electron count of an unsaturated heterocycle can be modified by the incorporation of heteroatoms from different periodic groups. Sulfur and nitrogen are particularly effective in this regard, as their high electronegativity can stabilize electron-rich π-systems. A variety of…
The genes coding for two structurally different isocitrate dehydrogenase isozymes (IDH-I and IDH-II) of a psychrophilic bacterium, Vibrio sp. strain ABE-1, were cloned and sequenced. Open reading frames of the genes (icdI and icdII) are 1,248 and 2,229 bp in length, respectively. The amino acid sequences predicted fro…
We consider the energy dependence of the Mn 3s and 3p multiplets from gas-phase atomic Mn and crystalline ${\mathrm{MnF}}_{2}$ and ${\mathrm{KMnF}}_{3}$ over the range from x-ray photoelectron spectroscopy (XPS) energies down to energies near threshold. First comparing atomic and solid-state spectra for these multiple…
Summary Fouling from milk fluids is a severe industrial problem which reduces the efficiency of process plant. The chemistry of fouling has been thoroughly investigated but the sequence of events that occur is not yet clear. Deposit contains both protein and minerals. Experiments have been carried out to determine the…
The choice of the perturbation wave form is of crucial importance for reliable electrochemical impedance spectroscopy measurements based on the fast Fourier transformation. Using numerical simulation, arguments and results are presented for the choice and the optimization of a perturbation signal constructed as a supe…
Immobilized polyethylene glycol (PEG) reduced the amount of bovine serum albumin (BSA) adsorbed on polyvinyl alcohol (PVA) hydrogel, but did not reduce the platelet reactivity of the hydrogel surface. PEG, molecular weight (MW) 2000 or 5000, with or without a monomethoxy end group, was covalently bound to glutaraldehy…
Copper has 44% higher conductivity than aluminum, making copper an attractive interconnect metal for advanced multilevel interconnections in integrated circuits (IC) and multichip modules (MCM). Since sputter deposition is widely used in IC and MCM fabrication, the properties of sputtered copper films are investigated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptically active phthalocyanines and their circular dichroismNagao Kobayashi, Yayoi Kobayashi, and Tetsuo OsaCite this: J. Am. Chem. Soc. 1993, 115, 23, 10994–10995Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 Nove…
The morphology and growth process of oxide precipitates in Czochralski silicon have been studied with prolonged thermal treatments up to 700 h at intermediate temperatures (700–900 °C). It was found with transmission electron microscopy observation that (i) the morphology of precipitates changes from platelet to aggre…
The exchange hardening of nanostructured two-phase systems composed of an aligned hard phase and a soft phase with high magnetization is investigated using a micromagnetic approach, which accounts for interactions between the soft regions. For Sm/sub 2/Fe/sub 17/N/sub 3/(2.5 nm)/Fe/sub 65/Co/sub 35/(9 nm) multilayers,…
Domain observations were made on Fe- and Co-based amorphous magnetic wires that exhibit a large Barkhausen discontinuity during flux reversal. Domain patterns observed on the wire surface were compared with those found on a polished section through the center of the wire. It was found that the Fe-based wire consists o…