Materials Literature
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Abstract Luminescence spectra of aqueous solutions containing a fixed concentration of tetracycline (TC) and increasing concentrations of Eu 3+ were recorded both in the absence and presence of hydrogen peroxide (H 2 O 2 ). In H 2 O 2 ‐free solutions in which the Eu/TC molar ratio was varied from 1 : 1 to 8 : 1, the 5…
Core-shell ZnO/ZnMnO nanowires on a-Al2O3 and GaN (buffer layer)/Si (111) substrates were fabricated by pulsed laser deposition using a Au catalyst. Two ZnO targets with a Mn content of 10% were sintered at 1150 and 550 °C in order to achieve the domination in them of paramagnetic MnO2 and ferromagnetic Mn2O3 phases,…
Microstructure and polarization degradation are observed under cyclic electric loadings for [001]-oriented Pb(Mg1/3Nb2/3)O3–PbTiO3 single crystals. Microcracking and phase transition are found to bear effect for polarization degradation. Upon cyclic electric loading with a comparatively low field magnitude, phase tran…
The SiN x : H films with compositions differently deviating from the stoichiometric proportion are produced by low-frequency plasma-enhanced chemical vapor deposition at the temperatures 100 and 380°C. Deviations from the stoichiometric composition are varied by varying the ratio between the ammonia and monosilane flu…
Novel conducting nanostructured carbonaceous materials of various microstructures have been successfully prepared from nanocomposites containing polyacrylonitrile (PAN) inside the nanosized pores of imogolite, sepiolite and porous alumina membrane templates. The synthesis and electrochemical characterization of the PA…
In the present work, the welding parameters of tungsten inert gas (TIG) and activated tungsten inert gas (ATIG) welding processes were compared on duplex stainless steel with two protective gases (Ar and ArHeN 2 ). The addition of an activating flux can improve the TIG welding process. The ATIG process involves an inc…
The poor integration with host cornea tissue and the low mechanical properties of pHEMA hydrogel for artificial cornea remains a difficult problem to solve. A modified pHEMA hydrogel, MMA copolymerized and type-I collagen and bFGF immobilized, was previously prepared in an attempt to solve the problems. In this study,…
In this paper we show how polarizable molecular dynamics can be successfully used to understand lanthanoid(III) (Ln) hydration. In particular, our modelling is in very good agreement with EXAFS data and thus the microscopic picture emerging directly from dynamics can be useful to understand experiments. We show three…
The upconversion (UC) efficient Gd2O3:Er3+ nanophosphor powder has been synthesized through the combustion route using urea as a reducing agent. The UC studies have been carried out using 532 nm excitation, and the samples show intense emission bands in ultraviolet (340 and 383 nm), blue (411, 458, 472, and 491 nm), a…
A series of nickel nanoparticles are deposited on two metal oxides (α- Al2O3 and CeO2). The nickel precursor is first adsorbed on the support and then it is irradiated under rays. The samples are characterized by various techniques at several steps of their elaboration, such as UV-visible, XRD, SEM equipped with EDS,…
The characteristics of K, L 1 and L 3 -edges XANES spectra of group IV, V, VI compounds, which have different coordination number, number of d -electrons and the symmetry of coordination sphere, have been classified. Two p → d transitions were observed in the second derivative spectra of L 3 -edge XANES spectra of all…
The detailed description of rarely recorded Thalassiosira species in Brazil is presented with light microscope (LM) and scanning electron microscope (SEM) illustrations. A total of 78 phytoplankton net samples (20 microm) collected between the years 2000 and 2006 in coastal waters of southern Brazilian, Cassino Beach…
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…