Materials Literature
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Chemical-surface modification of coir fibers was done by dewaxing, using an alkali treatment (5% and 10% NaOH), vinyl grafting with methyl methacrylate (MMA) and cyanoethylation. The chemically modified fibers were characterized by Fourier transform infrared (FTIR) spectroscopy. In addition, the surface features of un…
The crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 Å resolution, respectively. The atomic models of the molecules were refined to the R factors 9.8 and 10%, respectively. The thr…
Alkanethiolate-protected gold nanoclusters are solublized through place exchange reaction with ω-thiocarboxylic acids.
The anodic behavior of ( S‐phase ) samples in 0.1 M NaOH solution was investigated. Critical potential behavior typical of dealloying was observed while sweeping the potential from open circuit in the anodic direction. Theoretical estimates based on curvature effects in alloy dissolution suggested the development of a…
NMR on ${}^{57}\mathrm{Fe}$ nuclei was measured in two single crystals of magnetite between 4.2 and 135 K (temperature of the Verwey transition ${T}_{V}=121.5$ and 123.9 K). We were able to register all lines detected at 4.2 K also at higher temperatures up to ${T}_{V}.$ The spectra are compatible with the space group…
Mesostructured silica functionalised with the dye moiety, (2,4-dinitrophenylamine), has been prepared with bimodal pore size distribution. Co-condensation of tetraethoxysilane and 3-(2,4-dinitrophenylamino)propyltriethoxysilane was used to covalently couple the organic chromophore into the wall structure of a silica m…
We report that ``ferroelectric relaxor'' behavior is induced by doping Bi in quantum paraelectric ${\mathrm{SrTiO}}_{3},$ and doping Ce in typical ferroelectric ${\mathrm{BaTiO}}_{3}.$ The present results show that the ``ferroelectric relaxor'' state may exist no matter whether the matrix is ferroelectric or paraelect…
The cellular silicon, nitrogen, and carbon content and the kinetics of silicic acid use were determined for Thalassiosira weissflogii grown under nutrient-replete, iron-deficient, and zinc-deficient conditions to assess the effect of metal deficiency on dlatom silicon metabolism. Iron-and zinc-deficient T weissflogi~…
Automotive emissions are severely regulated. Since 1980, a three-way catalyst (TWC) has been used to convert harmful emissions of hydrocarbons, carbon monoxide, and oxides of nitrogen into less harmful gases in order to meet these regulations. The TWC's efficiency of conversion of these gases is primarily dependent on…
The cell size of DVB–VBC PolyHIPEs decreases with increasing VBC content, which appears to be due to the adsorption of VBC at the emulsion interface leading to a lower interfacial tension and a smaller droplet size.
Research Article| January 01, 2000 Solid-Solution Solubilities and Thermodynamics: Sulfates, Carbonates and Halides Pierre Glynn Pierre Glynn U.S. Geological Survey, 432 National Center, Reston, Virginia 20192 Search for other works by this author on: GSW Google Scholar Author and Article Information Pierre Glynn U.S.…
Pt and Pd nanoparticles can be modified with surface-attached cyclodextrin receptors leading to water-soluble materials that exhibit catalytic activity for the hydrogenation of allylamine.
A new UV-blocking material consisting of cerium oxide (ceria) and turbostratic boron nitride (t-BN) has been synthesized. The surface of the ceria powders was coated with a t-BN layer by means of reaction between boric acid and urea on the surface of ceria. The thickness of the t-BN layer estimated by high resolution…
Segmented thermoplastic polyurethanes (TPU)s with amorphous soft segments from the reaction of hexamethylene diisocyanate and 1,2-butanediol and crystalline hard segments from 4,4′-methylenediphenyl diisocyanate and 1,6-hexanediol showed sharp glass-transition temperatures that could be used as shape-recovery temperat…
Fluorexon (4′,5′-bis[N,N-bis(carboxymethyl)aminomethyl]fluorescein) forms stable, water-soluble complexes with lanthanide ions. The complexes with neodymium(III), erbium(III) and ytterbium(III) display sensitised near-infrared lanthanide luminescence upon excitation of the fluorexon with visible light. The photosensit…
The structural and magnetic transitions in two ${\mathrm{Mn}}^{3+}/{\mathrm{Mn}}^{4+}(1:1)$ systems have been investigated using neutron diffraction and electron microscopy. In ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ the charge and orbital order develops in the paramagnetic phase of Pnma symmetry b…
Monodispersed cerium(IV) oxide (CeO2) particles composed of an agglomeration of primary nanocrystalline particles with a cubic fluorite structure could be synthesized from relatively concentrated cerium(IV) sulfate solutions up to 0.5 mol dm−3 by thermal hydrolysis at 120 to 240 °C. The influences of the presence of u…
Very strong, broad photoluminescence (PL) in the near infrared is displayed by colloidal HgTe nanocrystals. However, they are not stable over time—the PL moves to longer wavelengths, accompanied by an apparent drop in the quantum efficiency—which causes concern for the use of these materials in device applications. He…
Several de novo designed ionic peptides that are able to undergo conformational change under the influence of temperature and pH were studied. These peptides have two distinct surfaces with regular repeats of alternating hydrophilic and hydrophobic side chains. This permits extensive ionic and hydrophobic interactions…
Osmoprotectants exogenously supplied to a hyperosmotic culture medium are efficiently imported and amassed by stressed cells of Escherichia coli. In addition to their evident role in the recovery and maintenance of osmotic balance, these solutes should play an important role on the behavior of cellular macromolecules,…