Materials Literature
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Formate dehydrogenase (FDG) from methylotrophic bacteria Pseudomonas sp. 101 catalyzes the reaction of oxidation of the formate ion to carbon dioxide, which is accompanied by the reduction of nicotinamid adenine dinucleotide (NAD + ). The structures of the apo and holo (enzyme-NAD-azide triple complex) forms of the en…
To create a functionalizable and photopatternable biodegradable polyester, 2-hydroylethyl methacrylate (HEMA) grafted poly(ε-caprolactone- co -RS-β-malic acid) (PCLMAc) was synthesized. The ring-opening random copolymerization of ε-caprolactone (CL) and RS-β-benzyl malolactonate (MA) using stannous octoate catalyst wa…
Precise X-ray diffraction measurements have revealed that phonon (conventional) strain is introduced at the phase transition from an icosahedral quasicrystal to its orthorhombic crystal approximant in a Mg–Ga–Al–Zn alloy. From the magnitude of the measured phonon strain, the phonon–phason coupling constant has been ev…
Abstract Kaolinite deposits, hosted by rhyolitic tuffs, are found in the SE of the ‘Los Menucos’ area (Province of Rio Negro, Argentina). The most representative examples are from the Blanquita and Equivocada mines. To discover the origin of these deposits, a mineralogical, geochemical (major and trace element) and st…
A combined wide angle X‐ray diffraction (WAXD)/small‐angle X‐ray scattering (SAXS)/scanning electron microscopy (SEM)/density study of structure and morphology was carried out for a large series of pyromellitic dianhydride‐oxydianiline (PMDA‐ODA) polyimide (PI) samples processed using different powder metallurgy techn…
In previous papers [Wang, Q.; Li, X.; Wang, L.; Cheng, Y.; Xie, G. Ind. Eng. Chem. Res . 2005, 44 (2), 261−266; 2005, 44 (13), 4518−4522], a lumped kinetic scheme and a fractional kinetic model for the liquid-phase oxidation of p -xylene catalyzed by Co−Mn−Br was proposed and tested and the effect of water on the oxid…
Highly concentrated pastes of gold nanoparticles were successfully produced by using a special type of protective polymer and a mild reductant. The solid part of these pastes comprises up to 85wt% of gold nanoparticles, 10≈30 nm in diameter and a residual protective polymer. This component can be diluted at arbitrary…
We study experimentally the dynamics of the spontaneous rise of a meniscus made of polydimethylsiloxane of various viscosities on the outside of a micrometric fiber made of monofilament in polyethyleneterephthalate. Optical methods are used to measure simultaneously the height of the liquid interface and the associate…
A Comment on the Letter by Mark G. Kuzyk, The authors of the Letter offer a Reply.Received 1 March 2005DOI:https://doi.org/10.1103/PhysRevLett.95.109401©2005 American Physical Society
The oxidation behaviors of different grades of nuclear graphite—PAEB, PCEB, PPEA, and IG-11—were studied thermogravimetrically at 400, 800, and 1200°C as a part of work to select one grade of nuclear graphite for use in a gas turbine-modular helium reactor (GT-MHR). The results showed that all grades of nuclear graphi…
Abstract The electrochemical behavior of pure copper has been studied in aqueous environments using linear polarization and electrochemical impedance spectroscopy (EIS) techniques as a function of immersion time. The effect of pollutants (like chloride, sulfide and ammonium ions) on the nature of films formed on the c…
Abstract A new method for the preparation of compounds containing an azo‐dye moiety via opening the activated triazole ring upon coupling with nucleophiles was successfully applied to a mono‐triazole‐fused phthalocyaninato zinc complex 1 . The prepared unsymmetrical zinc‐phthalocyanine 3 conjugated with a 2‐hydroxy‐1‐…
A hybrid atomistic-continuum method is presented for incorporating Joule heating into large-scale molecular dynamics (MD) simulations. When coupled to a continuum thermostat, the method allows resistive heating and heat transport in metals to be modeled without explicitly including electronic degrees of freedom. Atomi…
The spectral behaviors of 4-n-pentyl-4'-cyanobiphenyl (5 CB) have been studied by means of temperature-dependent Raman spectros-copy in the range between --70 and 70 degrees C. The nu(C identical with N) bands in the Raman spectra were found splitting below the transition temperature from the solid to the nematic liqu…
Polyvinyl alcohol (PVA) is a water-soluble polymer, which is difficult to process in melt form owing to its poor processability and thermoplasticity. The thermoplastic polyvinyl alcohol (TPVA) prepared in this study is a brand new material for use in melt spinning. Satisfactory processability of TPVA can be obtained e…
We have used resonant Raman and absorption edge spectroscopy together with first-principle calculations in order to study the structure of GeS2 glasses (g-GeS2). The glasses were prepared under different melt temperatures and cooling rates, which are shown to significantly influence the g-GeS2 structure at the nano-sc…
ABSTRACT: This study was conducted to determine the feasibility of using corn zein as a natural gum base to be an alternative to the currently used synthetic gum base. The objectives were to (1) develop a corn zein chewing gum and (2) evaluate the taste, texture, and aroma qualities compared with synthetic gum base us…
129Xe and 131Xe nuclear magnetic resonance (NMR) spectroscopy was used to study the adsorption of xenon gas on as-produced single-walled and multi-walled carbon nanotubes. Overall, the adsorption was weak, with slightly stronger interaction between xenon and multi-walled nanotubes. Temperature-dependent spectra, relax…
Under similar test conditions, the electromigration reliability of Al and Cu interconnect trees demonstrate significant differences because of differences in interconnect architectural schemes. The low critical stress for void nucleation at the Cu and interlevel diffusion-barrier interface leads to varying failure cha…
Three Cu-precursors [Cu(hfac) 2 , Cu(DPM) 2 , and Cu(acac) 2 ] for supercritical fluid deposition (SCFD) were evaluated based on their adhesion strength onto a TiN underlayer for ULSI metallization. Although the fluorinated precursor, Cu(hfac) 2 , has the highest solubility in supercritical CO 2 among these three prec…