Materials Literature
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Abstract Aqueous polyurethane dispersions derived from various polycarbonatediols, m ‐di(2‐isocyanatopropyl)benzene(TMXDI), and various carboxylic diols including dimethylol propionic acid (DMPA), dimethylol butyric acid (DMBA), and a carboxylic polycaprolactonediol (Placcel 205BA) were prepared by a method in which t…
A study of the effects of the interactions with amino acids on the vibrational spectra of Keggin heteropolyanions (Na(n)H(3-)n[XM(12)O(40)](n-); n = 0,1,2,3; X = P(V), Si(IV), M = W(VI), Mo(VI)) has been performed. Interactions occurred for all of the studied compounds leading to changes and splits in the stretching f…
Electron spin resonance spectra have been studied in partially crystallized films of La(1-x)Na(x)MnO(3) (x = 0.16) in the vicinity of the para- to ferromagnetic transition. The objects of investigation were obtained by magnetron sputtering on polycrystalline Al(2)O(3) substrates held at different temperatures. It is s…
Abstract In this study, an effect of iron oxide (Fe 2 O 3 ) impurity in talc on degradation behavior of polypropylene (PP)/talc composite was studied using a PP/Fe 2 O 3 model composite sample. The thermal oxidative degradation was performed at 100°C. Although the degradation of a pure PP sample hardly occurred at suc…
The synthesis of NdNiO 3 perovskite structure was achieved by soft post deposition annealing of initially amorphous thin films reactively sputter deposited on silicon substrates. The physical measurements were fully consistent with the properties expected for the thermochromic NdNiO 3 phase. Upon heating, the optical…
Abstract Semi‐interpenetrating networks (Semi‐IPNs) with different compositions were prepared from poly(dimethylsiloxane) (PDMS), tetraethylorthosilicate (TEOS), and poly(vinyl alcohol) (PVA) by the sol‐gel process in this study. The characterization of the PDMS/PVA semi‐IPN was carried out using Fourier transform inf…
Polycrystalline CuFe 2 O 4 samples have been successfully prepared using a simple combustion method starting from citrate-nitrate precursors.All the ferrite samples studied were prepared at the same temperatures (300, 600, 900°C), but one series was slowly cooled from 900ºC to room temperature, and another was quenche…
Abstract In this article, preparation of polypropylene/clay nanocomposites (PPCNC) via in situ polymerization is investigated. MgCl 2 /montmorillonite bisupported Ziegler‐Natta catalyst was used to prepare PPCNC samples. Montmorillonite (MMT) was used as an inert support and reinforcement agent. The nanostructure of t…
Kaczmarska I., Ehrman J.M., Moniz M.B.J. and Davidovich N. 2009. Phenotypic and genetic structure of interbreeding populations of the diatom Tabularia fasciculata (Bacillariophyta). Phycologia 48: 391–403. DOI: 10.2216/08-74.1.Diatom alpha-taxonomy heavily relies on the discontinuity in variation of species-specific s…
Abstract The very high value of ionic conductivity at room temperature reported for La 0.51 Li 0.34 TiO 2.94 some years ago did originate a great deal of interest in the study of materials of general formula La 2/3– x Li 3 x TiO 3 (LaLiTiO) and related systems. These oxides have shown to be potential solid electrolyte…
Spleen tyrosine kinase (Syk) plays an essential role in IgE receptor signaling (FcepsilonRI), which leads to mast cell degranulation. Divalent binding of the tandem SH2 domain (tSH2) of Syk to the intracellular ITAM motif of FcepsilonRI activates the kinase domain of Syk, and thereby initiates cell degranulation. The…
The chemiluminescence (CL) phenomena of lanthanide (Ln) ions and their coordinate complexes in peroxomonosulfate system and the energy transfer mechanism during the process were investigated in this work. A strong and sharp CL signal was yielded when the Eu(III) or Tb(III) solution was added to the peroxymonosulfate s…
Abstract Alginate, a natural polymer, is potentially useful in biomedical applications, because it is very similar to macromolecular substances, unlike synthetic polymers that may cause problems due to toxicity and lack of recognition by cells. Alginate's processability characteristics, however, are a potential drawba…
Carbon nanotube-polymer composite fibers are obtained by infiltration of a monomer liquid into aligned carbon nanotube aerogel fibers with subsequent in situ polymerization. The monomer, methyl methacrylate (MMA), was infiltrated into the aerogel fibers of multi-walled carbon nanotubes (MWNTs) at room temperature and…
The microphase separation of binary polymer brushes at different temperatures is studied via Langevin molecular dynamics simulations. The order−disorder transition (ODT) from a homogeneous state to microphase-separated structures is investigated by analyzing various system properties such as the composition (density)…
Abstract In this work, three kinds of different poly( L ‐lactic acid) (PLLA) materials for melt‐spinning were investigated with respect to the molecular weight (MW) and molecular weight distribution (MWD), racemization, optical purity, thermal properties, and melt‐spinnability. It was found that the high MW was not th…
We investigate the effect of the electric field and the temperature on the electrical conductivity of one-dimensional disordered systems due to phonon assisted hopping of small polarons. The microscopic transport mechanism is treated within the framework of the generalized molecular crystal model and the Kubo formula,…
Materials with MgO nanocrystallites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Structure studies were performed by X-ray diffraction, scanning and transmis- sion electron microcopies. Nitrogen adsorption/desorpt…
High undercooling (about 392 K) was achieved in the bulk eutectic Ni70.2Si29.8 alloy melt through glass fluxing combined with cyclic superheating. It is found that the metastable phases Ni3Si2 and NiSi are obtained through slow post-solidification when undercooling exceeds 240 K. The metastable phases are confirmed by…
The cerium (III) glutathione complex was synthesized by the redox reaction of cerium (IV) with glutathione reduced (GSH) in aqueous solution. The Job-plots indicate an ML (L = GSSG) stoichiometry of the complex. The fluorescent properties of the compound were investigated. The as-prepared complex showed the characteri…