Materials Literature
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Abstract The phase behavior of blends containing chitosan with poly(vinyl‐alcohol) (PVA) and poly(2‐hidroxyethyl methacrylate) (P2HEM) was analyzed. Blends were obtained by casting from acetic acid solution (HAc) and 1,1,1,3,3,3 hexafluoro‐2‐propanol (HF2P) and studied by DSC, FT‐IR, and TGA. The phase behavior of the…
Abstract Beech wood boards were studied with a cone calorimeter. As the specific density of these materials is greater, the total amounts of CO and CO 2 produced were bigger than values measured on spruce specimens. Also, the shape of the heat release rate (HRR) curve was different as its second peak was bigger than t…
Ein neues Konzept für katalytische Reaktionen in wässrigem Medium ist die Verwendung eines temperatursteuerbaren Polymerträgers, Poly(N-alkylacrylamid), der durch Kombination mit Phosphorwolframsäure den Katalysator ergibt. Bei hoher Temperatur bildet sich eine Emulsion, die die Oxidation von Alkoholen mit H2O2 hoch e…
The kinetics of NO adsorption and dissociation on Pd(111) surfaces and the NO sticking coefficient (s(NO)) were probed by isothermal kinetic measurements between 300 and 525 K using a molecular beam instrument. NO dissociation and N2 productions were observed in the transient state from 425 K and above on Pd(111) surf…
Abstract The hydroxy end groups of aromatic and aliphatic hyperbranched poly‐(urea urethane)s prepared with an AA* + B*B 2 one‐pot method were modified with phenylisocyanate, butylisocyanate, and stearylisocyanate. The success of the modification reaction was verified with 1 H NMR and IR spectroscopy. Linear model pol…
We propose a simple method for the determination of liquid-crystal (LC) polar anchoring energy by electrical measurements. The basic idea of this method is a two-channel scheme for capacitance measurements. The first channel uses one cell with a planar LC cell, while the second a LC cell with vertical alignment. One o…
Abstract The monopalladium( II )‐substituted [Na 2 (H 2 O) 2 PdWO(H 2 O)(α‐AsW 9 O 33 ) 2 ] 10– ( 1 ) and the tripalladium( II )‐substituted [Cs 2 Na(H 2 O) 8 Pd 3 (α‐AsW 9 O 33 ) 2 ] 9– ( 2 ) were synthesized in aqueous acidic medium (pH 4.8) by reaction of Pd 2+ ions with [As 2 W 19 O 67 (H 2 O)] 14– and [α‐AsW 9 O…
A new law for the thinning of surfactant-free lamellae (applicable to metallic and ceramic foams with mobile interfaces) in a cross-section of an arid gas–liquid foam is derived using matched asymptotic analysis. Two limiting cases are identified at small capillary number: the well-known semi-arid foam having unit-ord…
A novel nanostructure, cubic silicon carbide (3C-SiC) nanoparticles encapsulated in branched wavelike carbon nanotubes have been prepared by a reaction of 1,2-dimenthoxyethane (CH3OCH2CH2OCH3), SiCl4, and Mg in an autoclave at 600 degrees C. According to X-ray powder diffraction, the products are composed of 3C-SiC an…
This article reports on the use of ion chromatography (IC) to investigate extensively the release profiles of both cations and anions and characterize the relationship between composition and degradation for a ternary-based Na(2)O-CaO-P(2)O(5) glass system developed as biomaterials. Studies are carried out on glasses…
Nitric oxide (NO) reduction with carbon monoxide (CO) on the Pd(111) surface was studied under isothermal conditions by molecular beam techniques as a function of temperature, NO:CO beam composition, and beam flux. Systematic experiments were performed under transient and steady state conditions. Displacement of adsor…
Photoluminescence (PL) from single-walled carbon nanotubes suspended in free space is shown to persist to high temperatures, at least to 425 \ifmmode^\circ\else\textdegree\fi{}C. A new transition is identified, shifting the optical band gap. This transition is abrupt, is hysteretic, depends simply on the PL emission e…
The atomic-scale structure of nanocrystalline ${\mathrm{ZrO}}_{2}$ obtained by ball milling has been studied using high-energy x-ray diffraction and the atomic pair distribution function technique. The studies show that, upon relatively short milling times, the parent crystalline material, monoclinic ${\mathrm{ZrO}}_{…
Neutron diffraction with isotopic substitution (NDIS) experiments and molecular dynamics (MD) simulations have been used to examine the structuring of solvent around d-glucose in aqueous solution. As expected, no significant tendency for glucose molecules to aggregate was found in either the experiments or the simulat…
Nitrobenzene was regioselectively oxidized to 2-nitrophenol with oxygen in a reaction catalyzed by the H5PV2Mo10O40 polyoxometalate. The reaction was first order in oxygen and catalyst. 15N NMR showed the interaction between nitrobenzene and the polyoxometalate. Use of labeled 18O2, H218O, a competitive kinetic isotop…
Superparamagnetic iron oxide (SPIO)-based colloid has been used clinically as a tissue-specific magnetic resonance contrast agent. We coupled monoclonal antibody A7 (Mab A7), which reacts specifically with human colorectal carcinoma, to Ferumoxides (SPIO) and examined the accumulation of this conjugate in xenografted…
Structure property relationships have been established at two different scales to examine reinforcing effects of nanocomposites made of cellulose whiskers and polyethylene-vinyl acetate (EVA) matrixes with different vinyl acetate contents. The role of the polymer structure on the work of adhesion as predicted by molec…
Abstract When polymer blends are foamed by physical foaming agents, such as CO 2 or N 2 , not only the morphology and viscosity of the blend polymers but also the solubility and diffusivity of the physical foaming agents in the polymers determine the cellular structure: closed cell or open cell and monomodal or bimoda…
Determinations of the phase formation sequence, crystal structures and the thermo-physical properties of materials at high temperatures are hampered by contamination from the sample container and environment. Containerless processing techniques, such as electrostatic (ESL), electromagnetic, aerodynamic, and acoustic l…
Abstract Novel nanocomposites of polyaniline dispersed with γ‐Fe 2 O 3 nanoparticles were prepared by the in situ polymerization of aniline in the presence of ammonium peroxysulfate as an oxidizing agent. Dielectric constants of the derived composites varied with the composition of γ‐Fe 2 O 3 present in the matrix. A…