Materials Literature
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Abstract The gas permeability of carbon dioxide, oxygen and nitrogen for hyperbranched polyimide (HBPI) containing trifluoromethyl groups were investigated. The HBPIs were prepared by condensation polymerization of a triamine monomer, 1,3,5‐tris(2‐trifluoromethyl‐4‐aminophenoxy) benzene (TFAPOB) and a commercially ava…
Abstract Curaua fibers were treated with ionized air to improve the fiber/phenolic matrix adhesion. The treatment with ionized air did not change the thermal stability of the fibers. The impact strength increased with increase in the fiber treatment time. SEM micrographs of the fibers showed that the ionized air treat…
Vacancy-induced magnetism in graphene bilayers is investigated using spin-polarized density functional theory calculations. One of two graphene layers has a monovacancy. Two atomic configurations for bilayers are considered with respect to the position of the monovacancy. We find that spin magnetic moments localized a…
Metal-oxide-semiconductor (MOS) diodes with zero-, one- or three-layer Ge quantum dots (QDs) embedded in the gate oxide are fabricated for visible to near-ultraviolet photodetection. Ge dots are formed by thermally oxidizing one or three stacks of amorphous Si (a-Si)/polycrystalline-Si(0.87)Ge(0.13)/a-Si multi-layers…
Abstract The reaction in water of Co II sulfate heptahydrate with 1,10‐phenanthroline (phen) and sodium pyrophosphate (Na 4 P 2 O 7 ) in a 2:4:1 stoichiometric ratio resulted in the crystallization of a neutral dinuclear Co II complex, {[Co(phen) 2 ] 2 (μ‐P 2 O 7 )} · 6MeOH ( 1 ), as revealed by a single‐crystal X‐ray…
Two different single-walled carbon nanotubes (SWNTs), the so-called HiPco and CoMoCAT, have been individually dissolved in aqueous solutions of double-stranded DNA (dsDNA). Atomic force microscopy (AFM) revealed the fine structures of the dsDNA-wrapped SWNTs. The near-IR absorption and photoluminescence (PL) spectra o…
We found a novel 52 kDa matrix glycoprotein MPP1 in the shell of Crassostrea nippona that was unusually acidic and heavily phosphorylated. Deduced from the nucleotide sequence of 1.9 kb cDNA, which is likely to encode MPP1 with high probability, the primary structure of this protein shows a modular structure character…
Abstract Three cyanido‐bridged Fe III –Mn II dimers, [Fe(pzcq)(CN) 3 ][Mn(phen) 2 (X)] · MeOH [X = Cl ( 1 ), Br ( 2 ); pzcq = 8‐(pyrazine‐2‐carboxamido)quinoline anion, phen = 1,10‐phenanthroline], [Fe(mpzcq)(CN) 3 ][Mn(phen) 2 (Cl)] · MeOH [ 3 ; mpzcq = 8‐(5‐methylpyrazine‐2‐carboxamido)quinoline anion], and one W V…
γ‐Y 2 Si 2 O 7 is a promising candidate material both for high‐temperature structural applications and as an environmental/thermal barrier coating material due to its unique properties such as high melting point, machinability, thermal stability, low linear thermal expansion coefficient (3.9 × 10 −6 /K, 200°–1300°C),…
This article describes the systematic preparation of a novel family of carbohydrate amphiphiles and bolaamphiphiles in which hydrophilic and hydrophobic units are connected via a ureido or bis(ureido) moiety. The sugar core is derived from aminopolyols such as D-glucamine (1), N-methyl-D-glucamine (2), or the sugar-li…
Abstract Cobalt ferrite (CoFe 2 O 4 ) nanoparticles from 2 nm to 15 nm were synthesized using a solvothermal procedure. In this non‐aqueous method, acetophenone was used as solvent and the particle size was controlled by changing the reaction temperature from 120 °C to 180 ºC. Nanoparticles show good crystallinity and…
The stability and structures of titanium-doped gold clusters Au(n)Ti (n=2-16) are studied by the relativistic all-electron density-functional calculations. The most stable structures for Au(n)Ti clusters with n=2-7 are found to be planar. A structural transition of Au(n)Ti clusters from two-dimensional to three-dimens…
Electrophoretic deposition (EPD) was utilized as a new method for the preparation of hydrotalcite (HT) thin films. The films were deposited on macroporous alumina substrates and on alumina substrates that had been previously coated by conventional dip-coating techniques using slurries of HT colloidal particles. Their…
Abstract The complex formation of oppositely charged surfactants with some polypeptides is known to induce β ‐sheet or helix formation. Here, we report on the complex formation of cylindrical brush polymers with poly( L ‐lysine) side chains and sodium dodecylsulfate (SDS). With increasing amount of added surfactant th…
We present here a detailed investigation of the static and dynamic magnetic behavior of a Mg(0.95)Mn(0.05)Fe(2)O(4) spinel ferrite nanoparticle system synthesized by high-energy ball milling of almost identical particle size distributions ([Formula: see text], 5.1 and 6.0 ± 0.6 nm). The samples were characterized by u…
Light excitation of surface plasmons in metallic nanoparticle clusters can induce huge forces. We study such forces by using an electrodynamics approach, which fully incorporates the retardation effect. As two particles approach each other, the single-particle plasmons hybridize and split into attractive bonding modes…
Abstract Eight new poly(imidesiloxane)s copolymers have been prepared by one‐pot solution imidization method. The polymers are made by the reaction of bisphenol‐A dianhydride (BPADA) with four different fluorinated diamines and amino‐propyl terminated polydimethylsiloxane (APPS). The polymers are named as 1a, 1b, 1c,…
Fast field cycling (1)H NMR relaxometry is applied to determine the dispersion of spin-lattice relaxation time T(1)(omega) of the glass former glycerol in broad temperature (75-360 K) and frequency (10 kHz-30 MHz) ranges. The relaxation data are analyzed in terms of a susceptibility chi(")(omega) proportional, variant…
Abstract Transparent zirconia (ZrO 2 ) nanocrystal dispersions in butyl acetate (BAc) or tetrahydrofuran (THF) were prepared by functionalizing zirconia nanocrystals, synthesized from a solvothermal reaction of zirconium (IV) isopropoxide isopropyl alcohol complex in benzyl alcohol, with 3‐methacryloxypropyltrimethoxy…
Abstract Critical aspects of starch plasticization in glycerol/excess water mixtures are analyzed in order to determine the time/temperature boundaries ultimately required for the successful plasticization of starch in a polymer melt‐processing environment. These findings are then related to the morphology of melt‐ble…