Materials Literature
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The Langmuir−Blodgett (LB) method was applied to low molecular weight organogelator N -[ N -(6-hydroxyhexyl)-3-carbamoylpropyl]-3,4,5-tris(dodecyloxy)benzamide ( 1 ) to form molecular-assembly fibers on a solid substrate. Molecule 1 formed a stable monolayer up to 40 mN/m at the air−water interface. The monolayer was…
We model an entire poly(ethylene terephthalate) (PET) solid-state polymerization (SSP) process with precrystallizers, crystallizers, SSP reactors, and dryers using a unified cell approach. This approach builds complex unit-operation models using individual cells, or continuous-stirred-tank reactor (CSTR) models. Each…
We propose a new method for fitting a model of specimen charging to scanning electron microscope (SEM) images. Charging effects cause errors when one attempts to infer the size or shape of a specimen from an image. The goal of our method is to enable image analysis algorithms for measurement, segmentation, and three-d…
Shells of the freshwater, pulmonate snail Physa (Mollusca, Gasteropoda), ranging from 0.5 to 10 mm in length, were studied using scanning microscopy, x-ray analysis, and infrared spectroscopy. Results obtained suggest that the shell is composed of aragonite, which occurs in several distinct crystalline forms. A select…
A spectrum image is recorded as an x-y array of beam locations at each of which a spectrum of radiation is recorded as stimulated by the beam. The large database or "datacube" that results from a single image presents a significant challenge to the analyst to recover information efficiently, especially in the case whe…
Cu(PPh3)3(TCNE) (TCNE = tetracyanoethylene) and 14 other examples form [TCNE]22- dimers possessing a long 2.89 +/- 0.05 A two-electron four-center (2e-/4c) C-C bond in the solid state. This bond arises from the overlap of the b2g pi* singly occupied molecular orbital (SOMO) on each [TCNE]*- fragment, forming a filled…
The p25 protein from Thermus aquaticus (Taq) was initially identified as a protein that bound preferentially to AT-rich DNA. The purified protein was characterized as a homodimer. In vitro, this protein displays nonsequence specific dsDNA-binding activity.1 Database searches revealed more than 30 gram-positive bacteri…
Three practically useful reductions of phenomenological mesoscopic field dislocation mechanics (PMFDM) are explored to evaluate some of their capabilities and limitations. Lower-order gradient plasticity arises as one of these reduced frameworks, and a boundary condition appropriate for the modelling of constrained pl…
The compounds p-R−C 6 H 4 −CH CH−C⋮C−TMS (R = NO 2, N(CH 3 ) 2, OCH 3 ) were obtained from Wittig olefination of TMS−C⋮C−CH 2 PPh 3 Br with p-R−C 6 H 4 −CHO in THF, which can be desilylated to give p-R−C 6 H 4 −CH CH−C⋮C−H. Treatment of RuHCl(CO)(PPh 3 ) 3 with p-R−C 6 H 4 −CH CH−C⋮C−H produced RuCl(CO)(PPh 3 ) 2 (CH…
Patterned polymer films are grafted from chemically active surface templates prepared by the localized electrochemical oxidation of an n-octadecyltrichlorosilane monolayer to form addressable areas for the site-selective binding of a bromine-terminated precursor. Atom-transfer radical polymerization of polystyrene gen…
We present strategies for improving the power output of large-area pn-junctions for thermoelectric power conversion. The gradient of the pn-junction's built-in potential is used to separate thermally generated electron–hole pairs. An externally applied temperature gradient along the pn-junction induces a driving force…
Weltrekord: Die Isolierung und Charakterisierung eines dianionischen homoleptischen Isocyanidmetallats gelang erstmals mit [Fe(CNXyl)4]2− (Xyl=2,6-Dimethylphenyl; siehe Struktur: Fe rot, N blau, C grau). Spektroskopie- und Strukturdaten sprechen dafür, dass in dieser elektronenreichen Spezies die stärkste Metall-Isocy…
The morphology of the NiO-Al2O3 catalyst, prepared by coprecipitation, impregnation, and mechanical powder mixing with ca. 5, 10, and 20 wt% nickel treated at 400 degrees, 700 degrees, and 1100 degrees C, was studied. Scanning electron microscopy is a useful technique for determining the manner of catalyst preparation…
Abstract High‐pressure X‐ray diffraction studies of Co x Zn 1– x O ( x = 0, 0.05, 0.10) were carried out with a synchrotron radiation source. The crystal parameters for three samples under pressure were refined by the Rietveld method. The bulk moduli for Co x Zn 1– x O ( x = 0, 0.05, 0.10) were determined by Birch's e…
The structural and electronic properties of diamond (100) surface, with hydrogen and oxygen terminations, have been studied using density functional theory. The energy calculations indicate that a hydroxyl is the most stable structure on the oxygenation surface. The surface properties with different terminations have…
A detailed survey of the low energy isomer spectrum of (SiO(2))(N), N= 6-10, 13, 16 has been performed using interatomic potential based global optimisations refined via high-level density functional calculations. Within these spectra, including many isomers reported for the first time, structurally and energetically…
A third-generation silicon drift detector (SDD) in the form of a silicon multicathode detector (SMCD) was tested as an analytical x-ray spectrometer on a scanning electron microscope. Resolution, output count rate, and spectral quality were examined as a function of the detector peaking time from 8 micros to 250 ns an…
This is an updated review related to the identification and/or accumulation of organic and inorganic extractable substances from di(2-ethylhexyl) phthalate (DEHP)-plasticized polyvinyl chloride (PVC), polyolefin, and various other plastic materials. The review considers the identification of such extractables, their r…
Abstract The structural properties of CaWO 4 , SrWO 4 , BaWO 4 , PbWO 4 , and EuWO 4 scintillating crystals under pressure have been studied by X‐ray powder diffraction, X‐ray absorption near‐edge structure measurements, Raman spectroscopy, and ab initio density functional theory calculations. The results obtained fro…
The first complete infrared FTIR absorption spectra of carbonado diamond confirm the interstellar origin of this most enigmatic diamond. All previous attempts failed to measure the absorption of carbonado diamond in the most important IR range of 1000-1300 cm -1 (10.00-7.69 μm) because of silica inclusions. In our inv…