Carbon Nanotubes and Nanofibers in Catalysis
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Fabrication of CdS Micropatterns: Effects of Intermolecular Hydrogen Bonding and Decreasing Capping Ligand
Novel branch-like CdS micropatterns were synthesized using thiosemicarbazide (NH 2 NHCSNH 2 ) both as a sulfur source and as a capping ligand in a methanol/water system. The thiosemicarbazide/CdCl 2 ratios were found to effectively play crucial roles in the morphologies of CdS crystals. With the ratios decreasing from…
Transition of Crystal Growth as a Result of Changing Polymer States in Ultrathin Poly(ethylene oxide)/Poly(methyl methacrylate) Blend Films with Thickness of <3 nm
The transition of crystal growth is revealed in ultrathin poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blend films (film thickness D < 3 nm) as the crystallization condition changes from vacuum to humidity. The PEO crystallizes into a fractal-like branched structure in a vacuum from a state mixed with PMM…
Study on the structure and processibility of the iodinated poly(vinyl alcohol). I. Thermal analyses of iodinated poly(vinyl alcohol) films
Abstract To get more information on the structure of iodinated poly(vinyl alcohol) (PVA), thermal analyses of unoriented and oriented PVA films were conducted. Unoriented and oriented PVA films iodinated with aqueous solutions at selected concentrations were carried out by thermogravimetry (TG) and differential scanni…
Solvent Effect on the Glass Transition Temperature of Syndiotactic Polystyrene Viewed from Time-Resolved Measurements of Infrared Spectra at the Various Temperatures and Its Simulation by Molecular Dynamics Calculation
Time-resolved infrared spectral measurement was performed in the solvent-induced crystallization process of syndiotactic polystyrene (sPS) glass at the various temperatures, and the crystallization kinetics were analyzed quantitatively. Both of the crystallization rate constant and the crystallinity estimated after pa…
Forsterite amorphisation by ion irradiation: Monitoring by infrared spectroscopy
We present experimental results on the crystal–amorphous transition of forsterite (Mg2SiO4) silicate under ion irradiation. The aim of this work is to study the structural evolution of one of the most abundant crystalline silicates observed in space driven by ion irradiation. To this aim, forsterite films have been sy…
Structural and NMR investigations of the ternary adducts of twenty α-amino acids and selected dipeptides with a chiral, diaqua–ytterbium complex
A detailed investigation of the nature of the binding of each of the 20 common alpha-amino acids and various selected dipeptides to a chiral, diaqua-ytterbium complex in aqueous solution has been carried out. Analysis of the dipolar 1H NMR paramagnetic shifts suggests that the alpha-amino acids form a common chelated…
Diamagnetic and paramagnetic ring currents in expanded porphyrins
Ipsocentric current density maps are computed at the coupled Hartree-Fock level in the 6-31G** basis set for the planar C(2v) B3LYP geometries of the expanded porphyrins, sapphyrin and orangarin. Both give clearly dominant global macrocyclic ring currents, but with opposite senses of circulation: in 22[small pi] sapph…
Crystallization and melting behavior of nano‐CaCO3/polypropylene composites modified by acrylic acid
Abstract Nano‐CaCO 3 /polypropylene (PP) composites modified with polypropylene grafted with acrylic acid (PP‐ g ‐AA) or acrylic acid with and without dicumyl peroxide (DCP) were prepared by a twin‐screw extruder. The crystallization and melting behavior of PP in the composites were investigated by DSC. The experiment…
A study of the thermal and light induced spin transition in [FeL 2 ](BF 4 ) 2 and [FeL 2 ](ClO 4 ) 2 L = 2,6-di(3-methylpyrazol-1-yl)pyrazine
The spin crossover compounds [FeL2](BF4)2, L=2,6-di(3-methylpyrazol-1-yl)pyrazine and [FeL2](ClO4)2 have very unusual two stage spin transitions which are initially steep and then become more gradual. A detailed variable temperature single crystal X-ray diffraction study has shown that the course of the spin transitio…
Forsterite amorphisation by ion irradiation: Monitoring by infrared spectroscopy
We present experimental results on the crystal–amorphous transition of forsterite (Mg2SiO4) silicate under ion irradiation. The aim of this work is to study the structural evolution of one of the most abundant crystalline silicates observed in space driven by ion irradiation. To this aim, forsterite films have been sy…
Advances in the Production of Poly(Lactic Acid) Fibers. A Review
Poly(lactic acid) has recently seen its development as a textile fiber. With the resin prepared from agricultural feedstock, the fiber has properties typical of a synthetic fiber, while still being fully biodegradable. This article is an attempt to review recent research developments which have taken this polymer from…
Coordination chemistry of 2-(8-aminoquinolino)-4,6-di-tert-butylphenol with manganese( iv ), iron( iii ), and cobalt( ii / iii ):N,O-coordinated o-iminobenzosemiquinonate(1−) π radical monoanions vs.o-iminophenolate(2−) dianions
The potentially tridentate ligand 2-(8-aminoquinolino)-4,6-di-tert-butylphenol, H[1LAP], has been synthesized and its coordination chemistry with Mn(IV), Fe(III), and Co(III) has been investigated by X-ray crystallography, electro- and magnetochemistry, electronic, Mossbauer and EPR spectroscopies. The following compl…
Synergic Nitrogen Source Route to Inorganic Fullerene-like Boron Nitride with Vessel, Hollow Sphere, Onion, and Peanut Nanostructures
In this paper we describe the large-scale synthesis of inorganic fullerene-like (IF-like) hexagonal boron nitride with vessel, hollow sphere, peanut, and onion structures by reacting BBr(3) with the synergic nitrogen sources NaNH(2) and NH(4)Cl at 400-450 degrees C for 6-12 h. The composition of products could be conf…
Charge density analysis of two polymorphs of antimony(iii) oxide
High-resolution X-ray diffraction data have been collected on the cubic polymorph of antimony(III) oxide (senarmontite) to determine the charge distribution in the crystal. The results are in quantitative agreement with crystal Hartree-Fock calculations for this polymorph, and have been compared with theoretical calcu…
Sensitization of TiO2 by Supramolecules Containing Zinc Porphyrins and Ruthenium−Polypyridyl Complexes
Modification of wide band gap semiconductor surfaces by a new generation of supramolecular sensitizers combining porphyrin and ruthenium-polypyridyl complexes leads to versatile molecular interfaces, allowing the exploitation of photoinduced charge transfer in photoelectrochemical devices.
Thermal properties of wood reacted with a phosphorus pentoxide–amine system
Abstract The objective of this research was to improve the fire‐retardant properties of wood in one treatment using a phosphorus pentoxide–amine system. Phosphorus pentoxide and 16 amines including alkyl, halophenyl, and phenyl amines were compounded in N,N ‐dimethylformamide and the resulting solutions containing pho…
Effect of Carbon Dioxide on the Interfacial Tension of Polymer Melts
Supercritical CO 2 is a promising solvent for application in polymer blending and foaming. Interfacial tension is a key parameter in determining the bubble nucleation and growth rates, as well as droplet breakup in blending. However, very limited data are available in the literature for CO 2 −polymer systems. In this…
Phase Behavior of PS−PVME Nanocomposites
The influence of nanometer thick, highly anisotropic organically modified layered silicate (montmorillonite) on the phase behavior of deuterated polystyrene (dPS) and poly(vinyl methyl ether) (PVME) is investigated by a combination of small-angle neutron scattering (SANS) and a two-dimensional combinatorial method bas…
A DFT Study of Interaction of Carbon Monoxide with Carbonaceous Materials
Reaction of CO with carbonaceous surfaces was investigated using B3LYP density functional theory level (DFT) with the 6-31G(d) basis set. It was found that CO can be adsorbed exothermically on the active sites of zigzag, armchair, and tip carbonaceous models to yield stable intermediates such as cyclic ether, carbonyl…