Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic Diarylethenes with Intralocking ArmsMasahiro Irie, Osamu Miyatake, Kingo Uchida, and Takeshi EriguchiCite this: J. Am. Chem. Soc. 1994, 116, 22, 9894–9900Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 N…
Hydrotalcite‐like compounds of formula Ni 1 − x Al x ( OH ) 2 ( CO 3 ) x / 2 · n H 2 O ( x = 0.1 to 0.25 ) , having the same structure as that of α ‐ Ni ( OH ) 2 , have been synthesized by substituting nickel hydroxide with aluminum. Of these, the compounds of compositions x ≥ 0.2 are found to have prolonged stability…
Abstract In soils low in organic matter, pesticide adsorption and desorption by clay minerals may strongly influence the fate of pesticides in soil environments. Atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1,3,5‐triazine) adsorption‐desorption was determined on 11 reference smectites (<2‐µm size fraction), and…
We report a new type of linkage between a carbohydrate and a protein, involving the rarely modified side chain of a tryptophan residue. An aldohexopyranosyl residue was found to be linked via a C-C bond to the indole ring of the tryptophan residue at position 7 of human RNase Us. Mass spectrometric analysis of peptide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetostructural Correlations in .mu.2-1,1-N3 Bridged, Dinuclear Copper(II) Complexes. 1. Ferromagnetic and Antiferromagnetic Coupling Associated with the Azide Bridge. X-ray Crystal Structures of [Cu2(DMPTD)(.mu.2-N3)(.mu.2-Cl)Cl2].cntdot.CH3CN, [Cu2(DMPTD)(.mu.2-N3)2(N3)2…
Analysis of current spikes associated with pitting events was performed on high purity Al loop wire electrodes over a range of Cl − concentrations (10 −4 to 1 M ) and potentiostatically applied potentials. A distribution of pitting and repassivation potentials was observed at each Cl − concentration. Factors controlli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTi3+ Defect Sites on TiO2(110): Production and Chemical Detection of Active SitesG. Lu, A. Linsebigler, and J. T. Yates Jr.Cite this: J. Phys. Chem. 1994, 98, 45, 11733–11738Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inis…
Phthalocyanine‐related compounds have many interesting materials properties. This review concentrates on the conductive properties of phthalo‐ and naphthalocyaninatometal compounds on the (e.g., see Figure). Syntheses are presented and the relationship between the morphology of the macrocycles and the electrical prope…
Polarized Raman-scattering spectra are obtained from oriented single crystals of yttria-doped ${\mathrm{CeO}}_{2}$. The temperature and dopant dependencies of Raman spectra strongly suggest that many structures in the Raman spectra of yttria-doped ${\mathrm{CeO}}_{2}$ are induced by the defect space including an ${\ma…
Foreword Acknowledgements Definitions of symbols used 1. Some fundamentals 2. The harmonic approximation and lattice dynamics of very simple systems 3. Dynamics of diatomic crystals: general principles 4. How far do the atoms move? 5. Lattice dynamics and thermodynamics 6. Formal description 7. Acoustic modes and macr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanization of Solid Substrates: A Step Toward ReproducibilityJ. B. Brzoska, I. Ben Azouz, and F. RondelezCite this: Langmuir 1994, 10, 11, 4367–4373Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https…
We present a comparative vibrational study of leucoemeraldine, emeraldine, and pernigraniline bases: fully reduced, half oxidized, and fully oxidized forms of polyaniline, respectively. By performing a general vibrational calculation based on the symmetrized dynamical matrix, we determine the force constants, the pote…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectric Field Modulated Nonlinear Optical Properties of Donor-Acceptor Polyenes: Sum-Over-States Investigation of the Relationship between Molecular Polarizabilities (.alpha., .beta., and .gamma.) and Bond Length AlternationF. Meyers, S. R. Marder, B. M. Pierce, and J. L. B…
Abstract A mixture of seven immiscible “virgin” plastics, namely low and high density polyethylene (LDPE and HDPE), polypropylene (PP), polyvinyl chloride (PVC), crystal and high impact polystyrene (PS and HIPS), and polyethylene terephthalate (PET), in proportions representative of those currently found in post‐consu…
An electron paramagnetic-resonance study of diamond films doped by implantation of phosphorus during film deposition is reported. Samples with nominal phosphorus concentration between 1016 and 1017 cm−3 exhibit two isotropic lines of equal intensity separated by 27 G. The double-line spectrum is expected for a nuclear…
CaF 2 :RE and CaSO 4 :RE are important phosphors. The phosphors corresponding to RE identical to Dy and Tm find applications in thermoluminescence dosimetry using ionizing radiations. Although these phosphors have been in use for several years, the mechanism of thermoluminescence in these phosphors is not well underst…
Computer simulations of Fe 3+ electron paramagnetic resonance spectra at X (9.5 GHz) and Q (34 GHz) bands in the alkali borate glass Li 2 O-2B 2 O 3 doped with Fe 2 O 3 have been carried out using an approach based on the eigenfield method applied to the 'rhombic' spin Hamiltonian, which contains only the Zeeman and q…
Single-shell nanotubes of carbon were produced by vapor-phase condensation on highly oriented pyrolytic graphite (HOPG). Atomic-resolution images were obtained using a scanning tunneling microscope (STM). The nanotubes are 1 nm wide and up to 20 nm long. The atomic structure of a zigzag configured tube is identified.…
The growth energetics of carbon nanotubes during arc discharge conditions are investigated. Ab initio molecular dynamics calcualtions show that the electric field alone cannot stabilize the growth of open metallic tubes. The addition of atoms and small clusters to tubes were studied using realistic atomic potentials.…
Abstract Various segmented block copolyetheramides based on nylon 6 and polyoxypropylene (POP) were synthesized by melt polymerization of caprolactam (CPL) and polyoxypropylene diamines (POPD) as a function of the size and content of POPD. As the content of POPD in the feed increased, the IR absorption band at 1110 cm…