Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst Transition Metal-Boryl Bond Energy and Quantitation of Large Differences in Sequential Bond Dissociation Energies of BoranesPaul R. Rablen, John F. Hartwig, and Steven P. NolanCite this: J. Am. Chem. Soc. 1994, 116, 9, 4121–4122Publication Date (Print):May 1, 1994Publi…
Actinide sorption on colloids may be described as a competition between the formation of complexes in solution and the build up of surface complexes. The role of particle and of carbonate concentrations on the sorption/desorption of <sup>241</sup>Am on montmorillonite, illite and hematite colloids is inves…
Abstract Formation of hydrogen bonds in various cellulose derivatives, 2,3‐di‐ O ‐ and 6‐ O ‐substituted cellulose ethers, were characterized by FTIR and solid‐state CP/MAS 13 C‐NMR. The polymers were synthesized by regioselective substitution of hydroxyl groups and had a uniform structure. Since their three hydroxyl…
The maximum-entropy method (MEM) has been tested on a limited set of noisy Fourier data from a known electron-density distribution (EDD). It is shown that maximizing the entropy of the EDD under the usual condition of fitting the variance of the data set does not necessarily lead to a satisfactory error distribution o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation between the Shear Yielding Behavior and Secondary Relaxations of Bisphenol A Polycarbonate and Related CopolymersChaodong Xiao, Jae Young Jho, and Albert F. YeeCite this: Macromolecules 1994, 27, 10, 2761–2768Publication Date (Print):May 1, 1994Publication Histor…
Highly transparent and conductive undoped and impurity-doped ZnO thin films have been prepared by atmospheric-pressure chemical vapor deposition (CVD) using Zn(C 5 H 7 O 2 ) 2 as a zinc source. A resistivity as low as 4.6×10 -3 Ω · cm and an average transmittance above 85% in the visible range were obtained for undope…
Abstract Pure Al (99.998%) and technically pure Al (99.5%) were oxidized in oxygen at room temperature, 250°C and 500°C. The oxidized samples were exposed to a humid atmosphere (80% RH) at room temperature for times ranging from 1 day to 1 month. The reaction products were analysed by ESCA, scanning Auger microscopy,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable Photon Energy Photoelectron Spectroscopy of Transition Metal MoleculesJennifer C. GreenCite this: Acc. Chem. Res. 1994, 27, 5, 131–137Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/d…
Abstract The contribution of edge‐complexation reactions to metal ion sorption by smectites has not been well documented through experimentation or modeling. A model containing fixed‐charge (X − ) and hydroxylated edge sites (AlOH and SiOH) was applied to sorption data for Cd on SWy‐1 smectite and a smectitic soil iso…
Significant improvements in the performances of the Super-ACO storage ring free-electron laser (FEL) at 800 MeV have been obtained recently: enhancement of the output power in the ultraviolet, laser duration of 10 h for the same injection of positrons, long-term stability with a micropulse of 60 ps FWHM. A first serie…
Gadolinium-DTPA (diethylenetriaminepentaacetic acid)-cascade-polymer, a potential new blood pool contrast agent for magnetic resonance (MR) imaging, was compared with a known blood pool agent, Gd-DTPA-polylysine, in an animal model. The relative signal intensities of liver, renal cortex, pancreas, and trunk muscle wer…
The incorporation characteristics of three simple tetraarylporphyrins into bilayers of dioctadecyldimethylam monium surfactants was studied by UV-vis, fluorescence, and EPR spectroscopy.The porphyrins used are tetraphenylporphyrin (TPP), tetrakis(4-(hexadecyloxy)phenyl)porphyrin (THPP), and tris(4-(hexadecyloxy)phenyl…
Angle-resolved ultraviolet photoemission spectra using synchrotron radiation were measured for oriented thin films of bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) (BTQBT) on graphite. From the photon energy dependence of normal emission spectra, the energy-band dispersion of π-bands were observed for the highest (H…
A first principles local density functional investigation on extended, two-dimensional periodic slab models of the MgO(001) surface is performed, using the linear combination of Gaussian-type orbitals (LCGTO) technique as implemented in the FILMS program package. Stimulated by recent theoretical evidence for a reduced…
The development of Vickers indent‐induced tracks with increasing indent load has been studied in two Y 2 O 3 ‐stabilizel ZrO 2 ceramics. Such cracks form as radial or Palmqvist cracks at low loads, assume “kidney” shapes at intermediate loads, and finally form median (half‐penny) cracks at high loads. The plastic zone…
Crystals of a fragment of human fibronectin encompassing the 7th through the RGD-containing 10th type III repeats (FN7-10) have been produced with protein expressed in E. coli. The crystals are monoclinic with one molecule in the asymmetric unit and diffract to beyond 2.0 A Bragg spacings. A mutant FN7-10 was produced…
The dimer compounds ${\mathrm{Cs}}_{3}$${\mathrm{Er}}_{2}$${\mathit{X}}_{9}$ (X=Cl,Br,I) were synthesized and grown as crystals. Their f-f absorption spectra were measured and their upconversion luminescence behavior was studied as a function of temperature. Both $^{4}$${\mathit{I}}_{15/2}$${\ensuremath{\rightarrow}}^…
A vertical porous InP structure with an aspect ratio larger than 100 was obtained by electrochemical anodization of a <111>A-oriented n -InP substrate with HCl etchant. The photoluminescence spectrum of this porous InP showed less surface recombination as well as a slight blue shift attributed to the quantum-siz…
Transcriptional activation by many eukaryotic sequence-specific regulators appears to be mediated through transcription factors which do not directly bind to DNA. BmFTZ-F1 is a silkworm counterpart of FTZ-F1, a sequence-specific activator of the fushi tarazu gene in Drosophila melanogaster. We report here the isolatio…
We use the two solvation potentials discussed in the previous paper and polymer reference interaction-site model (PRISM) theory to calculate the mutually consistent single-molecule conformation and liquid structure of model linear flexible nonpolar polymers. We focus on the mean end-to-end distance R2 and radius of gy…