Materials Literature
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Si + ion-implanted silicon wafers are annealed at different temperatures from room temperature to 950 °C and then characterized by using the photoluminescence (PL) technique at different recorded temperatures (RETs). Plentiful optical features are observed and identified clearly in these PL curves. The PL spectra of t…
Optical properties of directly excited erbium (Er3+) ions have been studied in silicon rich silicon oxide materials codoped with Er3+. The spectral dependence of the direct excitation cross section (σdir) of the Er3+ atomic I415/2→I411/2 transition (around 0.98 μm) has been measured by time resolved μ-photoluminescenc…
The phonon spectrum; crystal structure of the polar phase; spontaneous polarization; dielectric constant, piezoelectric, and elastic moduli tensors for free_standing and substrate_supported superlattices m BaTiO 3 / n SrTiO 3 (with m = n = 1–4) were calculated within the density functional theory. The simulation of pr…
ZnO/silica nanocomposites films were prepared by sol-gel method and deposited by dip- coating technique. Fourier Transform Infrared (FTIR) spectroscopy revealed the inclusion of ZnO crystallites in silica thin films. The presence of excitonic peaks in optical absorption spectrum confirms the introduction of ZnO crysta…
A selection of marine biominerals, mostly aragonitic coral skeletons were probed at the Mg K-edge by XANES spectroscopy coupled to μXRF methods and compared to an extensive set of relevant model compounds (silicates, carbonates, oxides and organic). Extensive methodologies are required to better describe the speciatio…
Chemical state analysis of silver species in Ag + exchanged zeolite A and Y catalysts were carried out by means of XAFS and UV-Vis spectroscopies. Order of thermal stability of silver cluster was Ag(50%)-Y > Ag(60%)-A > Ag(100%)-A, which was consistent with the previous 1 H NMR study for stability of chemisorbed hydro…
Abstract An electron paramagnetic resonance (EPR) study of glasses and magnetically dilute powders of [Gd(DTPA)(H 2 O)] 2− , [Gd(DOTA)(H 2 O)] − , and macromolecular gadolinate(1−) complexes P792 was carried out at the X‐ and Q‐bands and at 240 GHz (DTPA=diethylenetriaminepentaacetato; DOTA=1,4,7,10‐tetraazacyclododec…
This study aimed to prepare and characterize silk sericin and chitosan blend film as well as the native silk sericin and chitosan films. The films were observed their morphology using Scanning Electron Microscope (SEM). The secondary structures of the films were analyzed using Fourier Transform Infrared (FTIR) spectro…
We systematize experimental data on the elemental vapor-phase synthesis of zinc oxide nanocrystal arrays on substrates. This process may yield nanostructures differing in shape and dimensions, in particular, well-aligned ZnO nanorod arrays. A model is proposed in which aligned zinc oxide nanorod arrays may grow by the…
Udgivelsesdato: 2009-Nov
We surveyed subaerial habitats on the four main islands of Hawaii, USA for freshwater algae to examine patterns of distribution and to search for endemic species. Habitats sampled included cliff faces that ranged in moisture content from very dry to periodically moist from groundwater fog and rain. In this report we f…
Particle coarsening trends at high temperatures (200 to 700 °C) in CeO 2 nanoparticles having various chemical histories are determined by powder X-ray diffraction (XRD), low-temperature nitrogen adsorption, transmission electron microscopy, and small-angle neutron scattering (SANS). Intergrowth of individual CeO 2 cr…
The determination of the quality of an imaging system is not an easy task for, in general, at least three parameters, strictly interdependent, concur in defining it: resolution, contrast, and signal-to-noise ratio. The definition of resolution itself in scanning microscopy is elusive and the case of scanning ion micro…
Abstract Physical blends and thermoplastic vulcanizates (TPVs) based on EPDM and PP were prepared in a batch mixer. Dynamic vulcanization of TPVs using resol/SnCl 2 was studied as a function of time. Static and dynamic vulcanization of EPDM in the absence of PP were also studied. Crosslinking of EPDM in the absence of…
Nine Navicula species observed in European rivers and lakes are discussed using light and scanning electron microscopy. Four of them are described as new species: Navicula antverpiensis Van de Vijver & Lange-Bertalot sp. nov., N. wendlingii Lange-Bertalot, Hofmann & Van de Vijver sp. nov., N. lacuum Lange-Bertalot, Ho…
New red emitting phosphors, Ca3(VO4)2:Eu3+,Bi3+, Ca3((P,V)O4)2:Eu3+ were synthesized by low temperature solid-state reaction and characterized by X-ray diffraction, scanning electron microscopy, photoluminescence spectra and Fourier transform infrared spectroscopy. The results show that the red emission located at abo…
High altitude springs and headwater streams directly interact with atmospheric deposition and as a result may be useful first response bioindicators of changes in acid precipitation, i.e. from increased acid rain or mitigation efforts. We examined the diatom assemblages associated with bryophytes collected from high e…
Abstract A complex between a monoclonal antibody for porphyrin and zinc–porphyrin was utilized to construct an energy conversion system. Monoclonal antibody 2B6 bound meso-tetrakis(4-carboxyphenyl)porphyrin zinc complex (ZnTCPP) with a dissociation constant of 2.1 × 10−8 M. Upon binding the antibody, the lifetime of t…
Abstract The three‐dimensional structures in aqueous solution of the entire series of the Ln 3+ complexes [Ln(DOTP*‐Et)] − (formed from the free ligand P , P′ , P″ , P′′′ ‐[1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetrayltetrakis(methylene)]tetrakis[ P ‐ethylphosphinic acid] (H 4 DOTP*‐Et) were studied by NMR technique…
Results of a first-principles simulation of the σ phase of the Fe-Cr system performed using a WIEN2k program code in the generalized-gradient approximation for the exchange-correlation potential are given. The work was aimed at the determination of equilibrium states and energies of formation of the ferromagnetic stat…