Materials Literature
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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…
In this letter, we develop a mode-coupling theory for a class of nonlinear Langevin equations with multiplicative noise using a field-theoretic formalism. These equations are simplified models of realistic colloidal suspensions. We prove that the derived equations are consistent with the fluctuation–dissipation theore…
A simple method to construct composite microparticles consisting of porous-silicon one-dimensional photonic crystals infused with a polymer is described. The particles (see Figure) are generated by spray-coating a fine mist of polymer solution onto a photonic crystal layer and then removing the uncoated material by ch…
UV or visible excitation for ${\mathrm{Eu}}^{2+}$-doped ${\mathrm{Ba}}_{2}\mathrm{Si}{\mathrm{O}}_{4}$ and ${\mathrm{Ba}}_{3}\mathrm{Si}{\mathrm{O}}_{5}$ crystals produces broadband luminescence with peak wavelengths of 510 and 590 nm, respectively. The intensities of the long-lasting phosphorescence were measured as…
Optoelectronic properties of single CdS nanobelts are investigated by performing transport measurements with different laser ON/OFF circles. The current increases linearly with the bias voltage in the dark, and superlinearly under illumination. The superlinear increase can be related to the enhanced mobility due to th…
A series of electron donor-acceptor (DA) dyads, composed of a porphyrin donor and a fullerene acceptor covalently linked with two molecular chains, were used to fabricate solid molecular films with the Langmuir-Blodgett (LB) technique. By means of the LB technique, the DA molecules can be oriented perpendicular to the…
A novel method to prepare ultrathin, freestanding polyelectrolyte films in pores, without the need of sacrificial precursor coatings, has been developed (see Figure). The freestanding films are stable under ambient conditions and suited for additional electrostatic self-assembly or surface modification. They can be sp…
A synthetic analogue of a naturally occurring enzyme has been produced by grafting appropriate nucleophilic and hydrogen-bonding functionalities to gold nanoparticles via self-assembled monolayers (see Figure and cover). The synthetic analogue mimics silicatein proteins, which act as both catalysts and templates for f…
The layer-by-layer (LbL) deposition of poly(sodium 4-styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) over cotton fibres is reported. Cotton fibres offer unique challenges to the deposition of nanolayers because of their unique cross section as well as the chemical heterogeneity of their surface. Cati…
Magnetic properties of Mn-doped ZnO strongly depend on sample preparation and annealing. While the samples sintered in air at 500°C show ferromagnetism at room temperature, those sintered at 900°C are paramagnetic. The samples sintered in vacuum show a ferromagnetic transition at 45K, which is attributed to ferrimagne…
Abstract This article describes, in narrative style, the research of the author and his associates, performed over a period of 30 years, that led to the identification and quantification of the anomalous structures in poly(vinyl chloride) (PVC) and to detailed descriptions of their mechanisms of formation. Also examin…
The synthesis and characterization of two families of ionic liquid crystal dendrimers consisting of the ammonium salts of the commercially available poly(amidoamine) (G = 0-5) and poly(propylene imine) (G = 1-5) dendrimers and three long-chain carboxylic acids are reported. The liquid crystalline behavior was investig…