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材料科学与工程：中英文版 2010年第9期4卷 10-19页

作者： Igor Alessandro Silva Carvalho fernando soares lameiras Vitor Jose Pinto Gouveia Belinazir Costa doEspirito Santo Jose Roberto Tavares Branco Antonia Sonia Alves Cardoso Diniz Fundagao Centro Tecnologico de Minas Gerais Nucleous of Solar Materials Brasil 31.170-000 Rede Tematica em Engenharia de A lateriais Brasil 35.400-000 Department of Nuclear Engineering Centro de Desenvolvimento de Tecnologia Nuclear Brasil 31.270-901 Department of Chemical Engineering Universidade Federal de Minas Gerais Brasil 31.270.901 School of Desing Universidade do Estado de Minas Gerais Brasil 31.270-010 Companhia Energetica de Minas Gerais Brasil 30.190-131

Ultraviolet radiation is the mainly degradation cause of solar cells polymeric encapsulants films, leading to a photovoltaic efficiency conversion fails. In this work, it was produced gamma irradiated and non-irradiated quartz nanoparticles with a planetary balls mill by applying progressive compressive milling, as potentials ultraviolet radiation absorbers fillers for these films. The nanoparticles chemical composition was obtained by plasma optical emission spectroscopy. UV-vis-NIR results showed a similar total optical absorption on ultraviolet range to both kind of nanoparticles, with higher light transmission in visible and NIR range being characteristic of irradiated ones. It was found average sizes values of 60.82 nm with 16% efficiency with mainly Al and Fe compounds contaminations. The XRD results showed maximum pressure of 337 MPa for non-irradiated samples and 300 MPa for the irradiated ones, significantly lower than literature related values to 40 h of applied pressure. This could mean considerable process energy safe for quartz nanoparticles production.

关键词：薄膜太阳能电池近红外光谱仪纳米颗粒石英颗粒紫外可见 X射线衍射辐照光谱表征

Optical Absorption Behavior of Nanoparticles of Gamma Irradiated and Unirradiated Quartz with Residual a-AI203 for Solar Cells Encapsulation

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材料科学与工程：中英文A版 2012年第3期2卷 322-333页

作者： Igor Alessandro Silva Carvalho Eduardo Perini Muniz Femando soares lameiras Vitor Jose PintoGouveia Jose Roberto Tavares Branco Fundacao Centro Tecnologico de Minas Gerais Nucleus of Solar Materials Brasil 31.170-000 Rede Tematica em Engenharia de Materiais Brasil 35.400-000 School of Design Universidade do Estado de Minas Gerais Brasil 31.270-010 Universidade Federal do Esplrito Santo Espirito Santo Brasil 29.932-540 Department of Nuclear Engineering Centro de Desenvolvimento de Tecnologia Nuclear Brasil 31.270-901

Zeta Potential of Iron Oxide Pigment Powder Using a Rotating Disk

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材料科学与工程（中英文B版） 2013年第1期3卷 25-31页

作者： Paulo Henrique Campos Prado Tavares Femando soares lameiras Thematic Network on Materials Engineering (REDEMAT) Federal University of Ouro Preto (UFOP) Ouro Preto 35400-000 Brazil Development Center of Nuclear Technology (CDTN) National Nuclear Energy Commission (CNEN) Belo Horizonte 30161-970 Brazil

The zeta potential measurement with a rotating disk (RDZP) is a technique originally developed for disk-shaped planar solid samples. In this work, the feasibility of using this technique for pigments powder was studied. The raw material of these pigments came from the desliming step of banded iron formation ore processing. This tailing contains mainly iron oxides (? 76 wt%) and particles with average size around 4 μm, which make it a potential pigment. Two different pigments were investigated. The "as produced" mud (brown hue) and that obtained after thermal treatment at 1,000 °C (red hue). Characterization tests were carried out by X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric analysis (TG), differential thermal analysis (DTA), and laser granulometry. Color measurements of the pigments were performed using the CIELab system. The RDZP analyses of the pigments agree well with those reported in the literature using the traditional technique of mass transport by electrophoretic motility. The zeta potential measurements showed that the dispersion of the pigments in ammonium hydroxide solution with Ph = 14, ensuring absolute zeta potential values above 500 mV, is necessary to avoid pigment agglomeration when preparing styrene-acrylic paints.

关键词： Zeta电位旋转盘氧化铁颜料分散体 zeta电位 X-射线衍射仪料粉 X-射线荧光

Influence of the Hydriding Cycles on U-IOMo Alloy Comminution Process

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Journal of Energy and Power Engineering 2014年第9期8卷 1559-1567页

作者： Kelly Cristina Martins Faeda Ana Maria Matildes dos Santo~ Tercio Assuncao Pedrosa Natalia Mattar Cantagalli Femando soares lameiras t Wilmar Barbosa Ferraz Center of Nuclear Technology Development Materials Division Belo Horizonte-MG 31270-901 Brazil