Materials Literature
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The structural and optical properties of electron beam deposited CaS:Pb thin films were investigated as a function of annealing temperature and lead concentration. X-ray diffraction measurements show weak crystallinity for such layers. Although this improves with higher annealing temperatures, no difference in the gra…
Catalytic phenol oxidation in aqueous phase under intermediate temperature and pressure has been carried out in order to determine the kinetic model of phenol uptake rate. The catalyst employed here was a commercial one based on copper supplied by Engelhard (Cu-0203T). Operational variables have been studied in the fo…
Single crystals of $p\ensuremath{-}\mathrm{GaTe}$ were grown by the Bridgman technique and characterized through x-ray diffraction, energy-dispersive x-ray analysis, x-ray photoemission spectroscopy, and transmission electron microscopy studies. The photoconductivity spectral response for in-plane conduction showed a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationControlled Multi-Stage Recognition of Guests Using Orthogonal Electro- and Photochemical InputsAllan Goodman, Eric Breinlinger, Matthias Ober, and Vincent M. RotelloView Author Information Department of Chemistry University of Massachusetts Amherst, Massachusetts 01003 Cit…
Abstract Chitosan membranes were prepared by a solvent evaporation technique, followed by crosslinking with glutaraldehyde and coating with BSA. The effects of crosslinking and BSA coating on the pore structure of such prepared hydrogel chitosan membranes were determined. The diffusion rates of 12 non‐electrolytes ran…
The following three-dimensional structures of three forms of Escherichia coli branched-chain amino acid aminotransferase (eBCAT) have been determined by the X-ray diffraction method: the unliganded pyridoxal 5'-phosphate (PLP) form at a 2.1 A resolution, and the two complexes with the substrate analogues, 4-methylvale…
We study the structural, optical, and electrical properties of ${\mathrm{Mg}}_{z}{\mathrm{Y}}_{1\ensuremath{-}z}$ switchable mirrors upon hydrogenation. It is found that the alloys disproportionate into essentially pure ${\mathrm{YH}}_{3\ensuremath{-}\ensuremath{\delta}}$ and ${\mathrm{MgH}}_{2}$ with the crystal stru…
The entropies of a series of pure-silica molecular sieves (structural codes *BEA, FAU, MFI, and MTT) are obtained by calorimetric measurements of low-temperature heat capacity. The third-law entropies at 298.15 K are (on the basis of 1 mol of SiO 2 ): *BEA, 44.91 ± 0.11 J·K -1 ·mol -1; FAU, 44.73 ± 0.11 J·K -1 ·mol -1…
In the reaction of (η 5 -pentamethylcylopentadienyl)gallium (Cp*Ga) with B(C 6 F 5 ) 3, Ga t Bu 3, and Cp*GaX 2 (X = Cl, I) the new complexes Cp*GaB(C 6 F 5 ) 3, 1, Cp*GaGa t Bu 3, 2, and Cp*GaGa(X) 2 Cp* (X = Cl, 3; I, 4 ), respectively, were obtained. Alternatively, complex 3 was formed in the reaction of Cp*Ga with…
Abstract α,ω‐Dihydroxy‐terminated copolymeric oligomers of a 1,3‐propylene/1,4‐cyclohexanedimethylene succinate structure were obtained by the thermal polycondensation of 1,3‐propanediol/1,4‐cyclohexanedimethanol/succinic acid mixtures. They were subsequently chain‐extended via phosgene synthesis to high molecular wei…
The synthesis of peripherally tetrasubstituted phthalocyanineiron(III) chloride derivatives, (R)4PcFe(III)Cl (R=NO2, NH2, OH. and CN at the positions 2,9,16,23 or 1,8,15,22) is described. The complexes were characterized by magnetic susceptibility measurements, electronic and infrared spectra and X-ray powder diffract…
Sago starch was chemically modified through esterification using 2-dodecen-1-yl succinic anhydride (DSA) and propionic anhydride (PA) and three different solvents: [N,N dimethylformamide (DMF), triethylamine (TEA), and toluene (TOU)]. The effect of reaction times and temperatures on the modification was investigated.…
In the rotational molding of semicrystalline polymers, the slow heating and cooling rates and an almost absence of shear stresses lead to coarse spherulitic morphologies free from molecular orientation. This molding process, which is suitable for short runs of large parts, is not favorable for the dispersion of additi…
Dilatometric measurements in isobaric cooling mode were performed to study the pressure effects on the crystallization kinetics of polypropylene (PP) up to 100 MPa. The experimental specific volume curves were analyzed by taking into account the thermal gradient that appears in the sample even for relatively low cooli…
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Boron-doped highly oriented graphite films (B-HOGF's) with an atomic fraction of boron from 0.4 up to 2.2 at. % have been prepared from well-crystallized, highly oriented graphite. The effect of boron doping on crystal structure has been investigated in terms of texture observation with a field-emission gun-type scann…
The progression of intramolecular organizations within a series of dilute poly(amido amine) (PAMAM) dendrimer/methanol solutions is examined by use of small-angle X-ray scattering (SAXS) combined with comparisons to electron density models and radial density distributions extracted by the indirect transformation for t…
Using Monte Carlo simulations we study crystallization in the three-dimensional Ising model with four-spin interaction. We monitor the morphology of crystals which grow after placing crystallization seeds in a supercooled liquid. Defects in such crystals constitute an intricate and very stable network which separate v…
We present a self-consistent pseudopotential calculation of surface and image-potential states on $MgB_2(0001)$ for both $B$-terminated ($B-t$) and $Mg$-terminated ($Mg-t$) surfaces. We find a variety of very clear surface and subsurface states as well as resonance image-potential states n=1,2 on both surfaces. The su…
We study the dissolution of a solid by continuous injection of reactive ``acid'' particles at a single point, with the reactive particles undergoing biased diffusion in the dissolved region. When acid encounters the substrate material, both an acid particle and a unit of the material disappear. We find that the length…