Materials Literature
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Water-soluble quantum dots (QDs) have been prepared by encapsulation within silica via a reverse microemulsion (see Figure). The QDs display comparable quantum yields to ZnS-capped CdSe, but are much less toxic than organic-coated water-soluble QDs. This method could be used for QD applications such as in biological l…
Polyaniline nanofibers (see Figure and cover) have been synthesized using dilute polymerization with reduced concentrations of both monomer and oxidant and a constant molar ratio. The diameters of the polyaniline nanofibers are tunable by appropriate selection of dopant acids. A dispersion of polyaniline nanofibers co…
Ordered hole-array structures of Si single crystals (see Figure) are formed by direct imprinting with an SiC mold followed by subsequent anode etching in HF solution. In this process, the ordered array of shallow concaves prepared by direct imprinting can act as starting points for the development of uniform-sized str…
Abstract Poly(vinyl chloride) (PVC) compounds perform best with adequate metal lubrication and polymer‐to‐polymer lubrication of PVC primary particle flow units. Much of the mechanism for the lubrication of PVC has been elucidated over the years. One point has not been completely understood, which is the “lubricant fa…
Magnetization, resistivity, and magnetoresistance (MR) are measured on detwinned ${\mathrm{EuBaCo}}_{2}{\mathrm{O}}_{5.5}$ single crystals over a wide range of dc magnetic fields (up to 33 T) and temperature (from 4 K to 300 K). ${\mathrm{EuBaCo}}_{2}{\mathrm{O}}_{5.5}$ has a layered structure (along the $c$ axis) wit…
Using Monte Carlo simulations we study the influence of ligand architecture (valence, branching length) and structure (polydispersity) of a flat protective polymer layer on the accessibility of its functional groups and efficiency of receptor targeting. Two types of receptor surfaces were considered: the surface homog…
We prepared 2% and 5% Co-doped ZnO nanocluster films at room temperature (RT) using doped ZnO nanoclusters as building blocks. The nanoclusters are produced by a third-generation magnetron-sputtering-aggregation source. Superconducting quantum interference device (SQUID), photoluminescence (PL), x-ray diffraction (XRD…
Co–Mn–Al thin films were prepared using ultrahigh-vacuum magnetron sputtering on thermally oxidized silicon substrates at various substrate temperatures. Composition, crystal structure, magnetic property, and surface roughness of the films were investigated. The film prepared at a substrate temperature (Ts) of around…
Abstract The vinyl industry made dramatic changes in the production of poly(vinyl chloride) (PVC) resin in the 1970s to comply with regulations governing workplace exposure and environmental emissions of vinyl chloride monomer (VC or VCM), after it was recognized that vinyl chloride was a human carcinogen. These chang…
The use of focused ion-beam (FIB) nanopatterning for manipulating self-assembled ZnO nanodots is described. Highly aligned ZnO-nanodot arrays with various periodicities (e.g., 750, 190, and 100 nm) on FIB-nanopatterned SiO2∕Si substrates were prepared by metal-organic chemical-vapor deposition (MOCVD). The artificiall…
Amphiphilic guanidinium alkylbenzenesulfonates (GCnBS; n = number of carbons in the alkyl chain) exhibited lyotropic behavior in aqueous and organic solvents. The GCnBS compounds formed gel-like phases in certain cyclic organic solvents (e.g. p-xylene, cyclohexane) through the formation of swollen interdigitated lamel…
Abstract The thermal degradation of flexible PVC treated with various metal chelates containing Cr, Al, Fe, Co, Ni, Cu, or Zn combined with two compounds, Al(OH) 3 and Mg(OH) 2 , was studied by thermal analysis. Limiting Oxygen Index (LOI), Smoke Density Rating (SDR), and mechanical properties were investigated. The s…
Epitaxial ruthenium dioxide (RuO2)∕chromiumdioxide(CrO2) thin film heterostructures have been grown on (100)-TiO2 substrates by chemical vapor deposition. Both current-in-plane (CIP) and current-perpendicular-to-plane (CPP) giant magnetoresistive stacks were fabricated with either Co or another epitaxial CrO2 layer as…
The effect of ligand structure on the magnetic resonance (MR) imaging and biodistribution of six gadolinium (Gd) chelates based on a hydroxypyridonate-terephthalimide (HOPO-TAM) ligand design was investigated. Modifications to the molecular structure of the Gd-HOPO-TAM chelates (hydrophilicity and aromatic group subst…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPoly(lactide) Swelling and Melting Behavior in Supercritical Carbon Dioxide and Post-Venting Porous MaterialTomoko Fujiwara, Tetsuji Yamaoka, Yoshiharu Kimura, and Kenneth J. WynneView Author Information Chemical Engineering Department, School of Engineering, Virginia Commonwea…
We present an inelastic light scattering study of single crystalline ${({\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{Pr}}_{y})}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ ($0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.14$, $y=0$ and $x=1∕8$, $0\ensuremath{\leqslant}y\ensuremath{\leqslant}0.5$). A g…
Combining inkjet printing and atom-transfer radical polymerization (ATRP) provides a straightforward and versatile method for producing patterned polymer surfaces that may serve as platforms for a variety of applications. We report the use of drop-on-demand technology to print binary chemical gradients and simple patt…
Caught in the act: Until now, the spatial property of the hyperfine interaction between the S=2 electronic spin and the I=5/2 nuclear spin in any chemically relevant MnIII compound has escaped observation. By taking multifrequency electron paramagnetic resonance measurements (see graph) on the [Mn(OH2)6]3+ ion doped i…
Functionalized phthalocyaninato-polysiloxanes can self-organize at surfaces into ordered rod-like architectures with a molecular cross-section, both at the solid-liquid interface and in dry films after thermal treatment. The hundreds of nanometer long semiconducting cylinders (see Figure and inside cover) with high ap…
Abstract The synergistic effect of metal soaps (zinc stearate and calcium stearate) and/or natural zeolite (clinoptilolite) on PVC thermal stability was investigated. For this purpose, PVC plastisol was prepared by mixing poly(vinyl chloride) (PVC) and dioctyl phthalate (DOP) and stabilized with different amounts of m…