Materials Literature
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A review of methods for producing and using condensed melamine phosphates as flame retardants, and analysis of our own investigations on production of melamine polyphosphate, are presented. Physicochemical properties of obtained products are given including thermal properties (DTA, TG, and DSC). Effectiveness of actio…
This paper examines the wetting characteristics of porous polyethylene surfaces modified by exposure to reactive oxygen glow discharge gas plasma, through the direct measurement of the wicking properties of the modified material. It is well-known that oxygen plasma can be used to chemically alter the surface of polyet…
The oxidation products in acetonitrile of hexapyrrolylbenzene (HPyB) and hexakis(3-octylpyrrolyl)benzene (HOPyB), two star-shaped compounds consisting of 6-fold N -pyrrolyl-substituted benzenes, were characterized by MALDI-TOF. These products result from intramolecular coupling of pyrrolyl residues without dimer or po…
The formation of the high-temperature hexagonal modification of DyMnO 3 and nonexisting as bulk hexagonal EuMnO 3, GdMnO 3, and SmMnO 3 was observed on ZrO 2 (Y 2 O 3 ) (111) substrates at 900 °C due to epitaxial stabilization. HREM study reveals epitaxial growth of the hexagonal film of limited thickness depending on…
Zirconia nanoparticles doped with up to 50 mol % Al 2 O 3 were prepared by chemical vapor synthesis (CVS). XRD data of these powders were refined by Rietveld analysis. Doping with alumina decreases the fraction of the monoclinic ZrO 2 phase and stabilizes the tetragonal or cubic ZrO 2 phase, forming different ZrO 2 /A…
Capillary electrophoresis (CE) has been performed on polymer-stabilized bundles and sodium dodecyl sulfate (SDS) suspensions of high-pressure carbon monoxide (HiPco)-produced single-walled carbon nanotubes. Real-time Raman spectroscopy has been used for detection and characterization of the separation process. Radial-…
Two nanocomposite oxides, NiO/Co 3 O 4 and Fe 2 O 3 /Co 3 O 4, are considered. The nanocomposite oxides were obtained by wet impregnation and characterized by means of X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, X-ray diffraction (XRD), thermal analysis,…
This review deals with problems involved in creating and handling nanoparticles, as well as the integration of nanoparticles into various systems and the operation of such systems. The review analyses the chemical, electrical and magnetic properties of the three main elements of nanotechnologies, viz., clusters, nanot…
Chiral bis-porphyrins are currently the subject of intense interest as chiral receptors and as probes in the determination of structure and stereochemistry. To provide an improved framework for interpreting the circular dichroism (CD) spectra of bis-porphyrins, we have calculated the CD spectra of chiral bis-porphyrin…
Electron injection rates from Ru(dcbpy) 2 (X) 2 [X = 2NCS, 2CN, and dcbpy; dcbpy = 2,2‘-bipyridine-4,4‘-carboxylate] (called Ru535 or Ru N3, Ru505, and Ru470) to TiO 2 nanocrystalline thin films are examined as a function of adsorbate redox potential, pH of the solution, excitation wavelength, and solvent. For all thr…
The improvement in efficiency of a parametric array by nonlinear oscillation of micro-bubbles in water is studied in this paper. The micro-bubble oscillation can increase the nonlinear coefficient of the acoustic medium. The amplitude of the difference-frequency wave along the longitudinal axis and its beam patterns i…
A novel class of surfactants was prepared from the ionic exchange reaction of sodium montmorillonite (MMT) and a comb-branch shape of maleated polypropylene (MPP) derived copolymers consisting of pendent quaternary ammonium salts, polyoxyalkylene linkers, and a polypropylene (PP) backbone. The hybrid surfactant is com…
We investigate theoretically how the confining walls of a nematic cell affect the interaction of particles mediated by the elastic deformation of a nematic liquid crystal. We consider the case where strong homeotropic or planar anchoring is imposed on the flat parallel walls so that the director on the wall surfaces i…
The rate of relaxation of zigzag single-walled carbon nanotubes is calculated by consideration of three-phonon Umklapp process. The results show that the relaxation rate increases exponentially with phonon frequency at low frequency. The linear dependence of the relaxation rate on temperature is obtained. It is shown…
We consider questions about the much discussed ``perfect lenses'' made by left handed materials. The transmission and reflection from a slab of left handed materials are investigated and the coefficients are obtained by the standard transfer-matrix method. Possible limitations on such superlenses are explored. It is s…
Strange generation and subsequent extinction of crystal nuclei were observed in the glassy state of salol (phenyl salicylate) during the course of ageing at very low constant-temperatures. The presence/absence of crystal nuclei within the glass were judged, by using a differential scanning calorimeter (DSC), from whet…
Aggregation distinctively changes the absorption and fluorescence anisotropy spectrum of β-tetraethyl-tetrapyridinyl-porphyrin 1 . A large excitonic splitting of the B band occurs, and the Q band absorption is distinctively enhanced. The latter effect must be attributed to intensity transfer from the B- to the Q-band…
Preliminary investigation into sonochemical treatment of polyvinyl chloride (PVC) was carried out in various liquids at temperatures up to 473 K, and the dechlorination of PVC was analyzed by thermogravimetry. The results indicated that dechlorination was observed and was affected by the kind of liquid used and the tr…
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An improvement to the Flynn−Wall method of determining apparent activation energies of the thermal degradation of polymers is presented. The method involves the deconvolution of differential thermogravimetric (TG) curves and the reconstruction of the corresponding TG curves of the individual thermal degradation proces…