Search Results - "Pontuschka, W.M"

Ionic conductivity behavior by activated hopping conductivity (AHC) of barium aluminoborosilicate glass–ceramic system designed for SOFC sealing by Da Silva, M.J., Pontuschka, W.M., Bartolomé, J.F., Jasinski, P., Karczewski, J., Reis, S.T.

“…Non-conducting BaO-B2O3-Al2O3-SiO2 parent glasses designed for solid oxide fuel cell (SOFC) sealing applications were prepared using the melt-quenching…”
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Dielectric properties and structural features of barium-iron phosphate glasses by Bergo, P, Reis, S.T, Pontuschka, W.M, Prison, J.M, Motta, C.C

“…The dielectric constant of barium-iron phosphate glasses with the general composition (40− x)BaO · xFe 2O 3 · (60− x)P 2O 5 has been investigated at two fixed…”
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Structural features of lead iron phosphate glasses by Reis, S.T., Faria, D.L.A., Martinelli, J.R., Pontuschka, W.M., Day, D.E., Partiti, C.S.M.

“…Lead iron–phosphate glasses were investigated for use as wasteform because of their improved chemical durability. There is a controversy if lead should or…”
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In vitro study of CD133 human stem cells labeled with superparamagnetic iron oxide nanoparticles by Gamarra, L.F., PhD, Pavon, L.F., PhD, Marti, L.C., PhD, Pontuschka, W.M., PhD, Mamani, J.B., MS, Carneiro, S.M., PhD, Camargo-Mathias, M.I., PhD, Moreira-Filho, C.A., PhD, Amaro, E., MD, PhD

“…Abstract Superparamagnetic iron oxide nanoparticles (SPIONs) are applied in stem cell labeling because of their high magnetic susceptibility as compared with…”
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A comparative study based on dosimetric properties of different sugars by Costa, Z.M. Da, Pontuschka, W.M., Campos, L.L.

“…Measurements of free radical densities in sugar by electron spin resonance (ESR) constitute a useful method for determining the dose received in the case of…”
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Study of the ESR signal of gamma irradiated hydroxyapatite for dose assessment by Da Costa, Z.M., Pontuschka, W.M., Campos, L.L.

“…In this work the ESR signal based on the measurement of the concentration of radiation induced radicals CO 2 − in hydroxyapatite, obtained from human tooth…”
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Effect of the Al2O3 addition on the formation of silver nanoparticles in heat treated soda-lime silicate glasses by Pontuschka, W.M., Giehl, J.M., Miranda, A.R., Da Costa, Z.M., Alencar, A.M.

“…We investigate the formation and evolution of silver nanoparticles in the non-irradiated thermally treated glass system Ag:(37–x)Na2O–10CaO–xAl2O3–53SiO2mol%,…”
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Dielectric properties and physical features of phosphate glasses containing iron oxide by Bergo, P., Pontuschka, W.M., Prison, J.M.

“…Microwave techniques were applied to the study of dielectric properties of phosphate glasses on the basis of contributions from permanent and induced dipolar…”
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Biocompatible superparamagnetic iron oxide nanoparticles used for contrast agents: a structural and magnetic study by Gamarra, L.F., Brito, G.E.S., Pontuschka, W.M., Amaro, E., Parma, A.H.C., Goya, G.F.

“…The magnetic properties of different biocompatible magnetic iron oxide nanoparticles (MION) are presented. Dextran-coated, magnetite (Fe 3O 4) MIONs were…”
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Dielectric properties of P2O5-Na2O-Li2O glasses containing WO3, CoO or Fe2O3 by BERGO, P, PONTUSCHKA, W. M, PRISON, J. M

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Dielectric properties of P 2O 5–Na 2O–Li 2O glasses containing WO 3, CoO or Fe 2O 3 by Bergo, P., Pontuschka, W.M., Prison, J.M.

“…The aim of this work was to study some polarization mechanisms in phosphate glasses containing different transition metal oxides, performed at radio frequency…”
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Optical and spectroscopic properties of soda lime alumino-silicate glasses doped with erbium and silver by Carmo, A.P., Bell, M.J.V., Da Costa, Z.M., Anjos, V., Barbosa, L.C., Chillcce, E.F., Giehl, J.M., Pontuschka, W.M.

“…► Enhancement of infrared Er 3+ luminescence with silver doping up to 20% when exciting the samples with 808 nm and 325 nm. ► Silver nanoparticles were formed…”
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EPR of γ-induced paramagnetic centers in tellurite glasses by Giehl, J.M., Pontuschka, W.M., Barbosa, L.C., Ludwig, Z.M.C.

“…Intrinsic paramagnetic responses were observed in the 60TeO 2–25ZnO–15Na 2O and 85TeO 2–15Na 2O mol% glasses, after γ-irradiation at room temperature: (1) a…”
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Thermal precipitation of silver nanoparticles and thermoluminescence in tellurite glasses by Giehl, J.M., Pontuschka, W.M., Barbosa, L.C., Chillcce, E.F., Da Costa, Z.M., Alves, S.

“…► Silver nanoparticles were precipitated in tellurite glasses by thermal treatment. ► A model was proposed to explain the mechanism of the precipitation of the…”
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EPR, FT-IR and XRD investigation of soils from Paraná, Brazil by Siqueira, R.E., Andrade, M.M., Valezi, D.F., Carneiro, C.E.A., Pinese, J.P.P., da Costa, A.C.S., Zaia, D.A.M., Ralisch, R., Pontuschka, W.M., Guedes, C.L.B., Di Mauro, E.

“…Samples of Araucária area soil from Paraná state, Brazil, were separated by particle size fractionation and investigated by electron paramagnetic resonance…”
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Study of sodium tellurite glass using the thermally stimulated depolarization current technique (TSDC) by Giehl, J.M., Pontuschka, W.M., Barbosa, L.C., Blak, A.R., Navarro, M., Da Costa, Z.M.

“…In order to have a better understanding of the role of the structure and the defects involved in the polarization processes in an 85TeO 2–15Na 2O mol% glass,…”
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ESR dosimeter based on P2O5–CaO–Na2O glass system by Da Costa, Z.M., Pontuschka, W.M., Giehl, J.M., Da Costa, C.R.

“…This paper presents the results of a study of thermal properties, solubility and response to 60Co γ-rays by electron spin resonance of the P2O5–CaO–Na2O glass…”
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Investigation of some dielectric properties of phosphate glasses doped with iron oxides, by a microwave technique by Bergo, P., Pontuschka, W.M., Prison, J.M., Motta, C.C.

“…The effects of iron ions on dielectric properties of lithium sodium phosphate glasses were studied by non-usual, fast and non-destructive microwave techniques…”
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An alternative method to study the cooling of glasses from melt to solid phase by Bergo, P., Pontuschka, W.M., Prison, J.M.

“…The aim of this preliminary work was to present a novel method, suitable to investigate the glass cooling, from melt to solid state, based on a fast, non-usual…”
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Dielectric properties of barium phosphate glasses doped with transition metal oxides by Bergo, P., Pontuschka, W.M., Prison, J.M., C.C. Motta, Martinelli, J.R.

“…The effect of addition of small amounts of the transition metal (TM) ions of Co, Fe and Mn to the composition of barium phosphate glasses on the dielectric…”
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