Materials Literature
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The MacDonald [2 + 2]-type condensation of readily available 5-aryl-substituted dipyrromethanes with acenaphthenequinone leads to the trans-syn- and anti-porphodimethenes, which in turn can be converted to the alpha,alpha- and alpha,beta-porphyrin atropisomers, respectively. Treatment of the metalated or unmetalated p…
A range of europium-activated titania phosphors with the formula Ti 1 - 3 x Eu 4 x O 2 ( x varying between 0.000397 and 0.00794) have been prepared, and the effects of europium content and titania phase on the luminescent properties have been investigated. It has been demonstrated that the crystallization temperature…
The crystallization behavior and crystalline morphologies of poly[(S)-lactide] (P[(S)-LA]) in thin films crystallized isothermally at over 160 degrees C were characterized by transmission electron microscopy and atomic force microscopy (AFM). The dendritic crystal and hexagonal crystal were formed in thin film with th…
A series of novel manganese α,ω-dicarboxylates, Mn 2 (H 2 O)[O 2 C(CH 2 ) n CO 2 ] 2 ( n = 3−12), were synthesized as single crystals or polycrystallines by the hydrothermal reaction of MnCl 2 with the corresponding dicarboxylic acid in the presence of base. Mn 2 (H 2 O)[O 2 C(CH 2 ) 3 CO 2 ] 2 and Mn 2 (H 2 O)[O 2 C(…
The preparation and electrochemical properties of four new dendrimers, compounds 1, 2, 3, and 4, containing eight, seven, four, and four ferrocene residues, respectively, are described. These small dendrimers were prepared with the building block bis(ferrocenylmethyl)alkylamine, which contains the tether −CH 2 −N(R)−C…
Microstructured honeycomb catalysts made of rhodium were manufactured and tested in the partial oxidation of methane under different experimental conditions. Even at operating pressures of up to 1.2 MPa with oxygen and up to 2.0 MPa with air, the catalyst was not found to be adversely affected by the reaction heat cau…
One-pot direct synthesis of cationic palladium nanoparticles that are stabilized by newly synthesized quaternary ammonium alkylisocyanides is reported. Reduction of PdCl 4 2 - by hydrazine in the presence of cationic isocyanides gave a stable aqueous dispersion of cationic palladium nanoparticles. The particle size de…
Kaolinite surfaces were modified by grinding kaolinite/quartz mixtures with mole fractions of 0.25 kaolinite and 0.75 quartz for periods of time up to 4 h. X-ray diffraction shows the loss of intensity of the d (001) spacing with mechanical treatment resulting in the delamination of the kaolinite. Thermogravimetric an…
A series of Fe−Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O 2 . The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NO x analyzer experiments showed that the mixed oxides were efficient an…
We report the results of ac and dc magnetization (M) and heat-capacity (C) measurements on the solid solution, Sr$_3$Cu$_{1-x}$Zn$_x$IrO$_6$. While the Zn end member is known to form in a rhombohedral pseudo one-dimensional K$_4$CdCl$_6$ structure with an antiferromagnetic ordering temperature of (T$_N$ =) 19 K, the C…
A novel membrane reactor with two zones containing structured filamentous catalytic beds was proposed for propane nonoxidative dehydrogenation. Catalytic filaments with a ∼7-μm diameter consist of silica covered by porous alumina with 0.5% Pt/1% Sn. These filaments were placed in parallel in a tubular membrane reactor…
The effect of terminal sterilization by gamma-irradiation on several ricinoleic acid based polyanhydrides was investigated. The following polymers were used: poly(ricinoleic acid maleate) [P(RAM)], poly(ricinoleic acid succinate) [P(RAS)], poly(hydroxy stearic acid succinate) [P(HSAS)], poly(hydroxy stearic acid malea…
Abstract Rigid poly(vinyl chloride) (PVC), PVC/chlorinated polyethylene (CPE), and PVC/CPE/oxidized polyethylene (OPE) compounds were prepared in a Haake torque rheometer. The fusion percolation thresholds (FPTs) of these compounds were defined and compared. Moreover, the fusion curves of these compounds were illustra…
In this work, we report an experimental investigation on hydrogen insertion mechanism into layered solid α-MoO 3 by creating different traveling paths for hydrogen during the protonation reaction with H 2 S at 152−155 °C. Our results show that hydrogen preferentially enters the layered host along 〈001〉 direction, alth…
Abstract A two‐part study utilizing polyoxymethylene (POM) was undertaken to investigate a three stage process (melt extrusion/annealing/uniaxial stretching) (MEAUS) employed to produce microporous films. In this first part, three POM resins (D, E, and F) were melt extruded into tubular films (blowup ratio; BUR = 1),…
Synthesis of an alpha,beta-alkyl branched polyester, i.e., poly(2-methyl-3-hydroxyoctanoate), has been accomplished via anionic polymerization of alpha-methyl-beta-pentyl-beta-propiolactone mediated by supramolecular complexes of potassium methoxide or potassium hydroxide, respectively. The structure of resulting poly…
The derivatives of anthraquinone, AQ n, and anthracene, A n, substituted with four alkoxy chains H 2 n +1 C n O (4 ≤ n even ≤ 14) in the 1, 4, 5, and 8 positions were synthesized. All of the molecules, except A 4, yield the smectic A mesophase below the isotropic phase, and with decreasing temperature, ordered smectic…
Cubic boron nitride nanocrystals with particle sizes of 25 nm have been synthesized at low temperature and low pressure by the benzene thermal method. The X-ray diffraction, infrared absorption spectrum, X-ray photoelectron spectrum, and the select-area electron diffraction pattern agree very well, and they confirm th…
Nanowires, point contacts and metallic single-wall carbon nanotubes are one-dimensional nanostructures which display important size-dependent quantum effects. Quantization due to the transverse confinement and resultant finite level spacing of electronic and phononic states are responsible for some novel effects. Many…
We report measurements of the low frequency conductivity and dielectric permittivity of quasi-one-dimensional organic (TMTTF) 2 X salts with non-centrosymmetrical anions X = ReO 4 and SCN. We show that the `structureless transition' at 227.5 K in (TMTTF) 2 ReO 4 is due to charge ordering and has a ferroelectric charac…