Materials Literature
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The adsorption process of the single polymer chain in a polymer brush of varying surface coverages is studied by means of Monte Carlo simulations of the bond-fluctuation lattice model. Only the end monomers can adsorb at the grafting surface, whereas inner monomers interact repulsively with it. The brush builds up a s…
Aggregation of some low-molecular weight compounds in organic liquids is known to result in the formation of rod-shaped colloidal particles. 1 Beyond the overlap concentration of the aggregates, the systems usually exhibit remarkable viscoelastic features which account for their description as gel-like materials. In p…
This study investigates the contributions of surface wetting and pore structure to liquid retention of fibrous materials using regular and microdenier poly(ethylene te rephthalate) (PET) fabrics as the porous media. Varying surface wetting contact angles and pore structures are produced by hydrolysis of these PET fabr…
Large-amplitude oscillatory shear was applied to a poly(styrene- b -ethylenepropylene) diblock copolymer and also to binary blends of this copolymer with homopolystyrene. The shearing was applied at a temperature above the glass transition and well below the microphase separation transition for long times: 12 h, strai…
Previous temperature-programmed desorption (TPD) and molecular beam studies have concluded that formaldehyde desorption is the only significant pathway in methanol oxidation at Cu(110) surfaces. We present here new TPD data for the adsorption of deuterated methanol (CD 3 OH) at a preoxidized Cu(110) surface and show t…
A high-throughput laser Raman spectrometer is used to detect adsorbed ethoxide species during the catalytic oxidation of ethanol over supported molybdenum oxide at atmospheric pressure. Two different species are observed, a true reaction intermediate and a relatively inert spectator on the surface. Steady-state and dy…
The problem of initiating and controlling the regeneration of diesel particulate filters is the major obstacle in the wide application of trap systems in diesel-powered vehicles. The most promising solution approaches to this problem, in terms of minimization of system cost and of additional fuel consumption, are base…
Single crystals of TMA-CuGS-2, [C 4 H 12 N] 6 [(Cu 0.44 Ge 0.56 S 2.23 ) 4 (Ge 4 S 8 ) 3 ], were synthesized hydrothermally, and the structure was determined using data collected from sealed-tube and synchrotron X-ray sources. This compound consists of Ge 4 S 10 4- adamantine clusters, corner-sharing with MS x units (…
We report resonance Raman and photoluminescence data from ultrathin films of CdS grown on Au substrates using electrochemical atomic layer epitaxy (ECALE). Samples ranged in coverage from 25 to 200 monolayers. Quantitative analysis of resonance Raman intensities leads to several important conclusions. First, ECALE doe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreorganization of Ferric Alcaligin, Fe2L3. The First Structure of a Ferric Dihydroxamate SiderophoreZhiguo Hou, Christopher J. Sunderland, Takayuki Nishio, and Kenneth N. RaymondView Author Information Department of Chemistry University of California, Berkeley Berkele…
Ethanol oxidation over supported molybdenum oxide was studied by in situ laser Raman spectroscopy, deuterium isotopic substitution, and steady-state kinetic measurements. Isotopic substitution experiments established that the same mechanism occurred over 9% MoO 3 /SiO 2, 15% MoO 3 /Al 2 O 3, and 9% MoO 3 /TiO 2 . The…
Pulse radiolysis is used to determine the absorption spectra of the transient species formed during the decay of the hydrated electron in an aqueous solution of Ag I 1 (NH 3 ) 2 + . The absorption spectrum attributed to Ag 0 1 (NH 3 ) 2 presents three peaks at 345, 385, and 435 nm. A theoretical estimation of the redo…
Using 1D and 2D 1 H-NMR and molecular modeling, we characterized the conformational features of template-assembled collagen-like polypeptides of the type KTA-[Gly-(Gly-Pro-Hyp) n -NH 2 ] 3 ( n = 1, 3, 5, 6; KTA denotes the Kemp triacid) and of the corresponding acetylated single-chain polypeptides Ac-(Gly-Pro-Hyp) n -…
Hydrotalcite-like compounds containing ZnII and CrIII in the brucite-like layers have been prepared, containing carbonate or decavanadate in the interlayer, with the formulae [Zn0.67Cr0.33(OH)2](CO3)0.165· 1.34H2O and [Zn0.67Cr0.33(OH)2](CO3)0.165· 1.34H2O, respectively. The samples have been characterized by XRD, XAS…
Two series of hydrophobe-modified, ethoxylated urethane (HEUR) polymers were synthesized. The first series was prepared by the step-growth (S-G) polymerization of poly(oxyethylene) (POE) of M n = 6000, with a slight excess of different aliphatic diisocyanates in a 4.2 to 3.2 mole ratio to produce a S-G polymer with M…
Variations in the thermal heat treatments used during the fabrication of ZIRLO (Zr-1Nb-1Sn-0.1Fe) fuel clad tubing and in ZIRLO alloy chemistry were explored to develop a further understanding of the relationship between processing, microstructure, and cladding corrosion performance. Heat treatment variables included…
The review concentrates on the crystal structure results from several protein crystallography laboratories on three different lysozymes, the type-c lysozymes such as hen egg-white lysozyme (HEWL), the type-g lysozyme, such as goose egg-white lysozyme (GEWL), and the lysozyme from T4 bacteriophage (T4L). The crystallog…
The free-base, copper(II) and zinc(II) derivatives of 5,10,15,20-tetraarylporphyrin (aryl = phenyl, 4-methylphenyl or 4-chlorophenyl) and the corresponding brominated 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraarylporphyrin derivatives have been synthesized and their spectral and redox properties compared by UV/VIS…
The 1 H NMR spectra of a series of well-characterized μ-phenoxo and μ-alkoxo spin-coupled dicopper(II) complexes have been investigated. The complexes studied were [Cu 2 (BPMP)(OH)] 2+ ( 1 ) (BPMP = 2,6-bis[[bis(2-pyridylmethyl)amino]methyl]-4-methylphenol), [Cu 2 (CH 3 HXTA)(OH)] 2 - ( 2 ) (CH 3 HXTA = N, N ‘-(2-hydr…
Charge-transfer (CT)π complexes between tetrathiafulvalene (TTF, donor) and tetracyanoethylene (TCNE, acceptor) have been studied. Two polymorphs (α and β) were obtained depending on the solvent used. X-Ray analysis has shown that both polymorphs are monoclinic with space group P21/n, are present in dimeric form [(TTF…