Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron transfer in a porphyrin dyadDevens Gust, Thomas A. Moore, Ana L. Moore, Lana Leggett, Su Lin, Janice M. DeGraziano, Roel M. Hermant, David Nicodem, Peter Craig, and Cite this: J. Phys. Chem. 1993, 97, 30, 7926–7931Publication Date (Print):July 1, 1993Pu…
Electrical and optical properties of as-deposited, ion beam sputtered, Al-doped ZnO films have been studied as a function of film thickness and carrier concentration. Hall effect measurements reveal that the bulk electrical resistivity of the film generally decreases with increasing film thickness. Additionally, it is…
The crystal structure of activated tobacco rubisco, complexed with the reaction-intermediate analogue 2-carboxy-arabinitol 1,5-bisphosphate (CABP) has been determined by molecular replacement, using the structure of activated spinach rubisco (Knight, S., Andersson, I., & Brändén, C.-I., 1990, J. Mol. Biol. 215, 113-16…
As part of a systematic study of metals on oxides, we report here a study of the growth of Fe films on TiO2(110) surfaces using low-energy ion scattering and x-ray photoelectron spectroscopy (XPS). Our studies reveal that Fe grows initially in an island growth mode, and completely covers the TiO2 substrate for thickne…
We report neutron reflectivity and dynamic secondary ion mass spectroscopy measurements of surface segregation from symmetric, isotopic polystyrene blends, spin coated onto oxide covered silicon wafers, as a function of film thickness. The results of this analysis show that the segments of the deuterated polymer alway…
Abstract A graft copolymer was prepared by coupling of poly(acrylic acid‐ co ‐acrylamide) (monomer ratio 1:8,5) with poly( N ‐isopropylacrylamide) (PIPA) having an amino group at its end. The copolymer with the graft chains obtained [poly(AA‐ co ‐AAm)‐ g ‐PIPA] showed a temperature‐responsive phase transition at 34°C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-photon photochromism of a naphthopyran derivativeManabu Uchida and Masahiro IrieCite this: J. Am. Chem. Soc. 1993, 115, 14, 6442–6443Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/1…
Analyzes data on the properties, processing and applications of the most widely-known polyolefins as well as some progress achieved in their synthesis. Theoretical descriptions of the reaction mechanisms, kinetics and thermodynamics of various physical and chemical phenomena are covered.
The physics of imaging with metal/phosphor (Gd2O2S:Tb on brass) screens at megavoltage energies has been investigated using Monte Carlo simulation. It has been found that pair production is a significant contributor to energy deposition for Bremsstrahlung beams with energies greater than 6 MV. The effects of different…
The human colon carcinoma cell line Caco-2 spontaneously undergoes enterocytic differentiation in culture. We used sodium butyrate to modify differentiation and growth properties of this cell line and considered c-myc expression as a potential target. Degradation of normal c-myc mRNAs with a half-life of 20 min is not…
Logarithmic dispersion relations are shown to be applicable to the determination of the phase of the structure factor of surface layers probed by neutron and x-ray reflectivity. For certain profiles it is shown that the phase \ensuremath{\Phi}(q) of the structure factor F(q) is determined entirely by the observed refl…
We report a detailed study of the optical phase shift induced by a polymer-dispersed liquid crystal subjected to a low-frequency electric field. A relationship between the optical phase shift and the droplet and sample order parameters ${\mathit{S}}_{\mathit{d}}$ and ${\mathit{S}}_{\mathit{f}}$ is worked out in order…
We report the first investigation of the adsorption of water on diamond (100) by infrared multiple-internal-reflection spectroscopy using a natural type IIa diamond internal reflection element. The first direct evidence of the diamond surface hydride structures, obtained by deuterium substitution, is also presented. I…
Abstract Considerable improvements have been made in the analysis of elastomer blends for composition, morphology and filler inter-phase distribution. GC, IR, NMR and thermal analysis (DTG, DSC, TG) techniques can provide quantitative information on composition. The latter three methods, along with SAXS, SANS, DMTA an…
We study electronic properties of the energy spectrum in a one-dimensional tight-binding model with site energies arranged in the Thue-Morse sequence. Using the trace map, we obtain the branching rules of the spectrum and perform a scaling analysis of bandwidths. It is shown that the spectrum consists of absolutely co…
Abstract Fibers (strands) with various draw ratios were spun from the liquid crystalline state of a pure aromatic liquid crystalline copoly(ester amide) and the melts of its blend with polycarbonate. Scanning electron microscopy (SEM), wide angle X‐ray scattering (WAXS), and differential scanning calorimetry (DSC) wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrientational relaxation in electric field poled guest-host and side-chain polymers below TgC. A. Walsh, D. M. Burland, V. Y. Lee, R. D. Miller, B. A. Smith, R. J. Twieg, and W. VolksenCite this: Macromolecules 1993, 26, 14, 3720–3722Publication Date (Print):July 1, 1993Publ…
X-ray reflectivity is a powerful technique to study electron density profiles in the direction normal to the surface of a fiat sample. As usual in scattering experiments, where the phase information is lost, it is necessary to build a model that can be used to calculate the reflectivity for comparison with the measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromic and gas adsorption properties of Langmuir-Blodgett films of lutetium bisphthalocyanine complexesM. L. Rodriguez-Mendez, R. Aroca, and J. A. DeSajaCite this: Chem. Mater. 1993, 5, 7, 933–937Publication Date (Print):July 1, 1993Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble polyimides with polyalicyclic structure. 1. Polyimides from bicyclo[2.2.2]oct-7-ene-2-exo,3-exo,5-exo,6-exo-tetracarboxylic 2,3:5,6-dianhydridesSumio Itamura, Masao Yamada, Shinji Tamura, Toshihiko Matsumoto, and Toshikazu KurosakiCite this: Macromolecules 1993, 26,…