Nanocrystalline diamond (NCD) has a great potential for prosthetic implants coating. Nevertheless, its biocompatibility still to be better understood. To do so, we employed several materials characterization techniques (SEM, AFM, micro-Raman spectroscopy) and cell culture assays using MG63 osteoblast-like human bone marrow cells. Biochemical routines (MTT assays, Lowry's method, ALP activity) supported by SEM confocal microscopy were carried out. We used silicon nitride (Si3N4) substrates...

RENbO4 (RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) materials were synthesized by solid-state reactions and then systematically investigated vibrational spectroscopy. Single-phase obtained at optimized temperature time conditions, which probed X-ray diffraction Raman scattering. Vibrational spectroscopy was employed to investigate the crystal structure of lanthanide orthoniobate series using different excitation lines in visible region also infrared techniques. All ceramics...

The effect of a slight A- and B-site cation nonstoichiometry on the structure, densification, microwave dielectric properties Ba(Mg1/ 3Ta2/3)O3 (BMT) was investigated. Magnesium barium nonstoichiometric compositions based Ba(Mg0.33-xTa0.67)O3 [x = −0.015, −0.010, −0.005, 0.0, 0.005, 0.010, 0.015, 0.020, 0.025, 0.030] Ba1-x(Mg0.33Ta0.67)O3 0.0025, 0.0075, were prepared using conventional solid-state ceramic route. lattice distortion ordering determined X-ray diffraction technique. phase...

Raman spectroscopy was employed to evaluate the crystal structure and phonon modes of chemically substituted Ba(RE1/2Nb1/2)O3 microwave ceramics (RE = La, Nd, Sm, Gd, Tb, Y). It verified that these materials could be divided into tetragonal (ceramics with RE Y, Gd) orthorhombic La) structures. Lorentzian lines were used fit spectra, which presented 9 bands for first group 23 second ceramics. The position width determined, correlated ionic radii tolerance factors different atoms in B'-site....

A2MgTeO6 (A = Ba, Sr, Ca) ceramics were prepared by solid-state route and their microstructure microwave dielectric properties, as well the vibrational phonon modes investigated using resonance method spectroscopic techniques for first time. For optimized sintering temperatures, Ba2MgTeO6, Sr2MgTeO6, Ca2MgTeO6 materials presented following properties: εr of 11, 14.3, 13.2; Quxf 25, 27.5, 81 THz, τf −16, −61, −81 ppm/°C, respectively. XRD besides Raman infrared spectroscopies employed to...

As tecnologias digitais tem se popularizado rapidamente, transformando não apenas a forma como nos comunicamos, mas também aprendemos. Com disseminação dos smartphones e o acesso à internet, os jovens têm um mundo de informações ao alcance das mãos. À medida que ser humano conecta com inúmeros dispositivos eletrônicos midiáticos, considera-se esse indivíduo está hiperconectado. No entanto, essa hiperconexão traz desafios para ambiente educacional. Este estudo busca entender cultura digital...

As hérnias inguinais são caracterizadas pela protrusão do conteúdo abdominal através de uma área enfraquecida na região inguinal. O reparo dessa afecção envolve intervenção cirúrgica que pode ocorrer por abordagem laparotômica (LAP) ou videolaparoscópica (VLP). Trata-se um estudo retrospectivo com coleta informações em base dados DATASUS e análise no software PAST®. foram analisadas segundo a Classificação Internacional Doenças (CID 10). A correção LAP sexo masculino foi mais prevalente...

Ordered Ba(B1/3′B2/3″)O3 ceramics are currently used as dielectric resonators for microwave and millimeter wave technologies. The degree of ordering is generally determined by x-ray techniques. In this work, we demonstrate that Raman spectroscopy can be to evaluate the long-range order these materials. We also show how varying samples allows partial assignment optical vibrational modes.

Nominally Sr2+nCe2Ti5+nO16+3n dielectric ceramics were prepared by conventional solid-state ceramic route. The structure and microstructural features of the investigated X-ray diffraction, photoelectron spectroscopy, scanning electron microscopy. At optimized sintering conditions, it is shown that Ce4+ ions reduce to Ce3+ ions, which leads correct formula Sr2+nCe2Ti5+nO15+3n for materials. present a cubic SrTiO3-like structure, where their associated vacancies randomly share A-sites with...

Hydrotalcites of the general formula Me6Al2(OH)16Cl2·4H2O (Me = Mg, Ni, Zn, Co, and Mn) Ca2Al(OH)6Cl·2H2O were prepared by coprecipitation method. X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, Raman scattering employed to study structural features these materials. Particularly, influences different chemical compositions on vibrational modes (stretching, bending, lattice) studied in detail. The compounds produced with crystallinity, ordering degree, number...

Lanthanide orthotantalates RETaO4 (RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) were synthesized by solid-state reaction in optimized conditions of temperature (1300 °C) time (up to 14 h) yield crystalline materials. The crystal structures the obtained compounds investigated X-ray diffraction Raman scattering. All samples exhibited monoclinic structures, but with different arrangements as a function ionic radius rare-earth metal occupying A-site. For largest radii...

This paper presents data for the synthesis and characterization of layer double hydroxides (LDH) their use color chemical oxygen demand (COD) removal from effluents generated by a textile industry. Adsorption studies with raw biologically treated (activated sludge) effluent showed that pseudo-second order model best fitted experimental data, leading to adsorption coefficients 39.1 102.9 mgCOD/gLDH effluents, respectively. The conditions COD were obtained at lower values temperature pH (25 °C...

Different oxide host matrices of ABO4 with A3+ (Eu) and B5+ (Nb, Ta, Sb) were prepared to investigate the solid state luminescence behavior Eu3+ as a self-activated emitter in orthoceramics. Crystal structures, phonon modes, metal valence states, optical excitation, emission properties including decay curves, colorimetry, nonstoichiometry defects studied using X-ray diffraction (XRD), Raman spectroscopy, photoluminescence (PL), photoelectron spectroscopy (XPS), electron paramagnetic...

Among the CoMoO₄polymorphs, α-phase exhibits highest performance for oxygen evolution reaction.

Hydrothermal technology was used to control the phase behavior and morphology of advanced electroceramics for applications as sensors, piezoelectrics, low-loss dielectrics in microwave components. Conventional microwave-assisted hydrothermal syntheses perovskite-type ceramics NaNbO3, BaZrO3, BaHfO3, BaMg1/3Nb2/3O3, also PbWO4, were carried out temperatures varying from 80 260 °C, under saturated vapor pressure. Computer simulations employed minimize trial-and-error mode synthesis. The...

Sr1–3x/2CexTiO3 dielectric ceramics (with x varying from 0.133 to 0.400) were investigated by Raman and infrared spectroscopies. The observed features could be related SrTiO3 phonon modes. spectra show first-order modes—which are modes either activated polar defects or due local symmetry lowering—together with classical second-order of SrTiO3. dominated the three predicted phonons SrTiO3, although a faint tetragonal distortion confirmed low-temperature measurements was for all compositions....

Sr2LnTaO6 (Ln = lanthanides, Y, and In) ceramics were prepared by a solid-state route, their vibrational phonon modes investigated using Raman infrared (IR) spectroscopic techniques. Lorentzian lines used to fit the spectra, which showed 24 bands in perfect agreement with theoretical calculations. The IR spectra fitted four-parameter semiquantum model, results 17 for materials. position width of determined correlated ionic radii different atoms substituted B′-site. It was verified that all...