Materials Literature
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Research studies have shown that protective coatings of diverse chemical composition represent a powerful factor stimulating the bacterial activity of corrosion inducers. On the film and mastic coatings investigated in the present paper, bacterial communities are formed, which consist of bacteria of various ecological…
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
We report the first experimental high–electric-field phase diagram of a nematic liquid crystal with negative dielectric anisotropy. The variation of the paranematic-nematic transition temperature ( T PN ) is essentially linear with | E |, whereas the Landau-de Gennes theory predicts a quadratic variation. It is argued…
Abstract The interaction between thin films of polyphenylacetylene (PPA) and bovine serum albumin (BSA) dissolved in phosphate buffer solution (PBS) was studied by x‐ray photoelectron spectroscopy (XPS) and Fourier‐transform infrared spectroscopy (FT‐IR) performed in reflectance mode. PPA is a semiconducting π‐conjuga…
The behavior of a Co-Cr-Mo biomaterial used as dental prosthesis was studied by electrochemical (Open Circuit Potential (OCP) and potentiodynamic polarization) and surface analysis techniques (Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS)) in artificial saliva, artificial saliva with modi…
Abstract Storage tanks containing microbially contaminated diesel oil are susceptible to corrosion. This process may be evaluated electrochemically in the laboratory using simulated storage systems containing diesel oil and an aqueous phase. The simulated aqueous phase must supply mineral nutrients for microbial growt…
Cryomilling is one of the few technologies available to fabricate a large quantity of nanostructured materials. No matter how exciting and promising a technology is, its ultimate realization is invariably dependent on economic success. Technical cost modeling was employed in this paper to analyze the processing cost o…
Wurtzite semiconductors GaN, ZnO, CdS, and CdSe are studied in this paper. Optical phonon frequencies of these semiconductors are calculated as a function of angle with respect to the $c$ axis. Electron-phonon interaction Hamiltonians and the total scattering rates are derived. Scattering rates for GaN, ZnO, CdS, and…
Abstract Sixteen OCH 2 CH 2 N 3 P( i ‐BuNCH 2 CH 2 ) 3 N substituents (A) containing the highly basic bicyclic azido‐phosphine moiety shown, have been incorporated into the dendrimer [CH 2 CH 2 N[(CH 2 ) 3 N[(CH 2 ) 3 NHC(O)‐3,5‐bis‐(A)‐C 6 H 3 ] 2 ] 2 ] 2 in five steps from commercially available starting materials w…
The characteristic features of hydroxystearic acid monolayers OH-substituted in the mid position of the alkyl chain deviate considerably from those of the usual nonsubstituted stearic acid. The phase behavior, domain morphology, and two-dimensional lattice structure of 9-, 11-, and 12-hydroxystearic acids are studied,…
ADVERTISEMENT RETURN TO ISSUEPREVNoteModulation of the Photophysical Properties of Gold Nanoparticles by Accurate Control of the Surface CoverageMarco Montalti, Luca Prodi, Nelsi Zaccheroni, and Gionata BattistiniView Author Information Dipartimento di Chimica "G.Ciamician", Università di Bologna, Via Selmi 2, 40126 B…
The relative partial molar enthalpies, Δ H̄ SiO2 , of SiO 2 in SiO 2 –M 2 O (M = Li, Na, K and Cs) binary and SiO 2 –CaO–Al 2 O 3 ternary melts were directly measured by drop‐solution calorimetry at 1465 K and 1663 K. Δ H̄ SiO2 changes from exothermic to endothermic as silica content increases, confirming the tendency…
Abstract The aim of this work was to investigate the initial stages of the SO 2 interaction with Ni(111) surfaces. SO 2 adsorption was performed at 1 × 10 −7 mbar, at room temperature, in a preparation chamber attached to the XPS analysis chamber. After each adsorption, the S 2p and O 1s core levels were analysed. Var…
In the preparation of textured ceramics of [Ca 2 CoO 3 ] 0.62 [CoO 2 ] (CCO-3-layer) by the reactive-templated grain growth (RTGG) method using β-Co(OH) 2 templates, we have examined the effect of processing conditions on the orientation degree and thermoelectric properties of the resultant ceramics. All the RTGG-prep…
Abstract The Konya region in central Anatolia is covered by Pliocene-Late Pleistocene sediments and volcanites related to the sediments NNW of Karapınar, Turkey. In the area, the Upper Miocene-Quaternary Üzecek Dağı and Karacadağ volcanites are generally of the same age and formed from magmas of similar composition. T…
Abstract The system of the nanocrystals of Si in the SiO 2 matrix (SiO 2 :Si) attracts a great amount of attention due to its ability for luminescence in the visible and near‐IR range of spectrum. The influence of the P ion doping was investigated for the electronic structure of the Si single crystal and the SiO 2 :Si…
The fatigue of mechanical strain induced by electric fields was investigated for antiferroelectric Pb 0.97 La 0.02 (Zr 0.77 Sn 0.14 Ti 0.09 )O 3 ceramics. The material shows a high resistance to fatigue owing to bipolar electric cycling up to 10 8 cycles. The strain hysteresis loop is still fairly symmetric, whereas t…
At the present time, the most widely-used piezoelectric material belongs mainly to the PZT solid solution system (1-x) PbTixO3 – x ZrTiO3. Because of the possible evaporation of lead oxides during ...
Dielectric relaxation (activation energy U≈0.03 eV, relaxation time τ0≈5×10−11 s) has been observed in SrTiO3: Mn solid solutions at low temperatures. It is assumed that the relaxation is related to reorientation of the polarons localized at defects of the {Mn Ti 2+ -O−} type and that the deviations from classical the…
Abstract Vegetable oil epoxides (oxiranes) are customarily manufactured using acetic acid (AA) as oxygen carrier and reactant source, in aqueous/organic media. Further attack of the oxirane ring by AA proceeds in this acid‐catalyzed process, lowering yield. We report a study of the degradation of the ring by water‐sol…