Materials Literature
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Porous Si 3 N 4 ceramics were synthesized by pressureless sintering of green compacts prepared using slip casting of slurries containing Si 3 N 4 , 5 wt% Y 2 O 3 +2 wt% Al 2 O 3 , and 0–60% organic whiskers composed of phenol–formaldehyde resin with solids loading up to 60 wt%. Rheological properties of slurries were…
The physical and mechanical properties of 12 glasses from the Y–(Mg,Ca)–Si–Al–O–N and (Mg,Ca)–Si–Al–O–N systems were investigated. The effect of the substitution of magnesium for calcium through two series of glasses, one consisting of oxides glasses and the other of glasses containing 6 at.% of nitrogen (15 e/o N), w…
Oriented mesostructured surfactant-silica nanocomposite thin films with a 2D hexagonal mesostructure of cylindrical micelles were prepared by evaporation-induced self-assembly using two different nonionic Brij surfactants and studied by small-angle X-ray scattering in symmetric reflection (SRSAXS) and grazing incidenc…
Yb 3+ , Ho 3+ : Lu 2 O 3 nanocrystalline powders were synthesized by a reverse‐strike co‐precipitation method using NH 4 HCO 3 and NH 3 ·H 2 O as precipitators. X‐ray diffraction analysis and field emission scanning electron microscopy observation showed that the phase composition of the powders was cubic and the part…
Abstract The novel nanosuperabsorbent copolymer (NSAP) was synthesized by grafting copolymerization of acrylamide (AM) and acrylic acid (AA) onto starch with montmorillonite (MMT) initiated using 60 Co γ‐ray irradiation. NSAP was characterized by IR spectroscopy and X‐ray diffraction (XRD). Different synthesis paramet…
Abstract Carboxymethylation of cellulosic material (average degree of polymerization 2600) containing 76.5% cellulose and 23.6% xylose isolated from cotton ( Gossypium ) linters was studied under varying reaction conditions with respect to maximum degree of substitution (DS). The influence of reaction conditions on th…
Excited states of free-base porphyrin isomers, porphycene (Pc), corrphycene (Cor), and hemiporphycene (hPc), were studied by the Symmetry-Adapted Cluster (SAC)/SAC-Configuration Interaction (CI) method. The absorption peaks of the porphyrin isomers were assigned on the basis of the SAC-CI spectra. The X, Y, X', and Y'…
The equilibrium swelling and phase behavior of monodomain nematic networks in nonmesomorphic solvents have been investigated as a function of temperature. The gels thermoreversibly undergo a phase transition between the swollen isotropic and shrunken monodomain nematic states with accompanying an anisotropic shape cha…
Acetate kinase catalyzes the reversible magnesium-dependent synthesis of acetyl phosphate by transfer of the ATP gamma-phosphoryl group to acetate. Inspection of the crystal structure of the Methanosarcina thermophila enzyme containing only ADP revealed a solvent-accessible hydrophobic pocket formed by residues Val(93…
Abstract A poly(vinyl alcohol) (PVA)/silica (SiO 2 ) nanocomposite was prepared with a novel self‐assembled monolayer technique, and its morphology and thermal properties were studied with different material characterization instruments. The treated SiO 2 nanoparticles were dispersed in the PVA matrix homogeneously, a…
Abstract Cellulose fiber surface was modified with silk sericin (or simply, sericin). Sericin fixation on cellulose was confirmed by environmental scanning electron microscopy (ESEM) and Fourier transform infrared spectrophotometry–attenuated total reflectance (FTIR‐ATR). Sericin content in finished samples was estima…
The magnetic and structural properties of two Ru2(DArF)4Cl compounds, where DArF is the anion of a diaryl formamidine, are presented here. The compounds with Ar = p-anisyl and m-anisyl both show temperature dependence of chiT (chi = molar magnetic susceptibility), but for different reasons. For the para compound, ther…
Aggregates of nanosized perovskites and spinels (particle sizes below 15 nm) have been prepared by means of a low-cost silica xerogel template route. High values of surface area for the perovskites and spinels are obtained.
The SEC-MALS-QELS (size-exclusion chromatography equipped with multiangle light scattering and quasi-elastic light scattering detectors) method using lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) and LiCl/1,3-dimethyl-2-imidazolidinone (LiCl/DMI) as mobile phases was applied to cellulose and cellulose tricarbanil…
Aqueous dispersions of mixed egg yolk phosphatidylcholine (PC) and poly(ethylene glycol) (PEG) modified distearoyl phosphatidylethanolamine (DSPE) were investigated with the purpose of determining shape, size, and conformation of the formed mixed micelles. The samples were prepared at a range of DSPEPEG to PC molar ra…
Abstract We studied the effect of nanofiber uniformity on electrospinning due to the charging of added ionic salts, as compared to the droplet current nonadded ionic salts and the charge‐to‐mass ratio of a highly conducting liquid. Various ionic salt concentrations were investigated. For an ionic salt concentration of…
Smectites, clay minerals commonly found in soils and sediments, vary widely in their ability to adsorb organic chemicals. Recent research has demonstrated the importance of surface charge density and properties of exchangeable cations in controlling the affinity of smectites for organic molecules. In this study, we in…
Abstract The effects of various additional non‐nitrile‐containing monomers on the heat resistance of thermoplastic expandable microspheres containing acrylonitrile and methacrylonitrile were investigated to determine the correlation between the chemical structure and expandable properties. Thermoplastic expandable mic…
Modern piezoelectric transducers normally have complicated structures and work under severe loading conditions. Due to their inherent domain‐switching processes, the real response of piezoceramics under large‐signal loading is dominated by a significantly non‐linear behavior that is to be considered in reliability ass…
In this study, we synthesized a series of the organic/inorganic hybrid star PCLs. These star PCLs can form inclusion complexes (ICs) with α- and γ-CD, but not with β-CD. These CD ICs were characterized by XRD, solid-state 13 C CP/MAS NMR spectroscopy, 1 H NMR spectroscopy, FT-IR spectroscopy, DSC, and TGA. Our results…