Materials Literature
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Abstract This article describes a new approach for the recycling of microporous polyurethane elastomers by Tris(1‐methyl‐2‐chloroethyl) phosphate‐induced degradation. The phosphorus‐containing degradation products formed are transformed into reactive intermediates by reaction with propylene oxide and are used for the…
Abstract Surface modification treatments were performed on six different types of polymers using low temperature cascade arc torch (LTCAT) of Ar with or without adding reactive gas of O 2 or H 2 O vapor. The effects of the treatments on the wettability enhancement, surface degradation from oligomer formation, and surf…
This study examines the field-dependent hysteretic behavior of a magnetorheological (MR) fluid and its identification using a Preisach model. The field-dependent shear stress of a commercially available MR fluid is measured using a parallel disk rheometer, and its shear stress versus shear rate hysteretic behavior is…
Fuel cells having proton conducting membranes comprising doped barium cerate ceramic BaCe 0.85 Y 0.15 O 3- α (BCY15) as electrolyte and platinum as both anode and cathode electrodes performed well for conversion of ethane to ethylene at 650 and 700 °C. No deterioration in performance occurred during 20 days of operati…
The use of alkyl ammonium cations resulted in four compounds of (A)[FeIII(ox)Cl2] (A = Et3NH+ (1a, 1b), Me4N+ (2), and n-Bu4N+ (3); ox = oxalate), whose structures and magnetic properties were characterized. In all cases, the metal Fe(III) ions are six-coordinated by four oxygen atoms from two bischelating oxalate lig…
We have studied the electronic structure of Ta n +1 AlC n (space group P 6 3 / mmc , n = 1–3) under uniform compression from 0 to 60 GPa and at temperatures from 0 to 1500 K using ab initio calculations. These phases can be characterized by alternating layers of high and low electron density and are referred to as nan…
We have developed a fully three-dimensional model based on the solution of the time-dependent Schr\"odinger equation for studies of polaron mobility in twisted polymer chains. Variations in ring torsion angles along a conjugated polymer chain are shown to have a strong effect on the intrachain charge carrier mobility.…
D-Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO), the most abundant enzyme, is the paradigm member of the recently recognized mechanistically diverse RuBisCO superfamily. The RuBisCO reaction is initiated by abstraction of the proton from C3 of the d-ribulose 1,5-bisphosphate substrate by a carbamate oxygen…
Organized mesoporous layers of SiO 2 with narrow pore size distribution centered at ca. 7 nm, which were uniformly functionalized with readily protonated amino groups, exhibit excellent permselective membrane properties. Their selectivity and permeability can be reversibly controlled by changing pH. The flux of hexacy…
Highly ordered ethylene bridged periodic mesoporous organosilica (PMO) materials with ultra-large pore sizes up to 14.7 nm were successfully synthesized by using triblock copolymer F127 as a template and 1,3,5-trimethylbenzene (TMB) as a swelling agent. SAXS and TEM measurements show that PMO products have a face-cent…
Ge/Si structures with a layer of Ge islands grown on oxidized Si surfaces and covered with Si were recently found to exhibit intense photoluminescence (PL) in the D1 region (∼0.8 eV) after annealing at high temperatures. We show that this PL is a property of the Ge/Si structures grown at low temperatures from about 40…
The authors present a joint experimental-theoretical study of collective diffusion properties in aqueous suspensions of charge-stabilized fluorinated latex spheres. Small-angle x-ray scattering and x-ray photon correlation spectroscopy have been used to explore the concentration and ionic-strength dependence of the st…
Carbon-nanotube network capacitors detect the presence of proteins directly from untreated serum. The devices are fabricated by a simple room-temperature technique and the detection scheme follows the protocol for protein assays currently used in clinical research. Prostate specific antigen, a marker for prostate canc…
Abstract Polyelectrolyte complexes (PECs) were prepared by mixing aqueous solutions of chitosan (CS) and poly( L ‐glutamic acid) (PLGA) at various pH. It was found that the stoichiometry of the PECs depends on pH. An investigation of the PECs using Fourier transform infrared spectroscopy proved that the formation of t…
Structural and spectroscopic investigations on Ti(IV) centers in different mesoporous silicas are carried out by an integrated experimental and theoretical approach. The combined study has allowed us to highlight many features of the tripodal ((OH)Ti(OSi) 3 ) or tetrapodal Ti(OSi) 4 Ti(IV) sites present in the silica…
This work describes the immobilization of beta-galactosidase onto polyelectrolyte multilayer assemblies of the polyanion poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) and the polycation poly(ethylenimine) (PEI) constructed by electrostatic self-assembly (ESA). A single…
Abstract The flame retardancy and mechanical properties of ethylene vinyl acetate (EVA) polymer nanocomposite based on magnesium hydroxide (MH) nanoparticles with lamellar‐shape morphological structures and synergistic agent microcapsulated red phosphorus (MRP) have been studied by limiting oxygen index (LOI), cone ca…
The discovery of carbon nanostructures, such as nanotubes and ${\mathrm{C}}_{60}$ fullerenes, has given rise to a number of potential nanoscale devices. One such device is the gigahertz oscillator, comprising an inner shell sliding inside an outer shell of a multiwalled carbon nanotube, and which, at least theoretical…
Artificially structured metamaterials with unit-cell dimensions on the order of $1∕10\text{th}$ of a wavelength $(\ensuremath{\lambda}∕10)$ have been shown to be well approximated by an effective medium description which mimics a continuous material. In this paper we present data for transmission and reflection from a…
Electronic absorption spectroscopy has been used to study changes in Co2+ ligand-field parameters as a function of alloy composition in Co2+-doped Cd(1-x)Zn(x)Se nanocrystals. A shift in the energy of the 4T1(P) excited-state with alloy composition is observed. Analysis reveals that Co2+-Se2- bond lengths change relat…