...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >X-ray absorption spectroscopy and high-energy XRD study of the local environment of copper in antibacterial copper-releasing degradable phosphate glasses
【24h】

X-ray absorption spectroscopy and high-energy XRD study of the local environment of copper in antibacterial copper-releasing degradable phosphate glasses

机译：X射线吸收光谱法和高能X射线衍射研究抗菌释放铜的可降解磷酸盐玻璃中铜的局部环境

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Phosphate-based glasses of the general formula Na2O-CaO-P2O5 are degradable in an aqueous environment, and therefore can act as antibacterial materials through the inclusion of ions such as copper. In this study, CuO and Cu2O were added to Na2O-CaO-P2O5 glasses (1-20 mol% Cu) and X-ray absorption spectroscopy (XAS) and high-energy X-ray diffraction (HEXRD) used to probe the local environment of the copper ions. Copper K-edge X-ray absorption near-edge structure (XANES) spectra confirm the oxidation state of copper to be predominantly 2+ in all samples regardless of which copper oxide was used in the preparation. The XANES results suggest the structural environment of copper to be octahedral with respect to oxygen in all samples. The HEXRD results yield a Cu-O nearest-neighbour distance of 1.98 angstrom and associated coordination number of approximately six, both consistent with octahedral coordination. Analysis of the extended X-ray absorption fine structure (EXAFS) data also yields structural parameters consistent with copper in an octahedral environment. The HEXRD and EXAFS results reveal a Cu-P distance of 3.13 angstrom, which confirms that the copper ions are coordinated within the phosphate glass network and not phase-separated in domains of copper oxide. (c) 2006 Elsevier B.V. All rights reserved.
机译：通式Na 2 O-CaO-P 2 O 5的基于磷酸盐的玻璃在水性环境中可降解，因此可通过包含诸如铜的离子而充当抗菌材料。在这项研究中，将CuO和Cu2O添加到Na2O-CaO-P2O5玻璃（1-20 mol％Cu）中，并使用X射线吸收光谱（XAS）和高能X射线衍射（HEXRD）来探测当地环境。的铜离子。铜K边缘X射线吸收近边缘结构（XANES）光谱证实，所有样品中的氧化态主要为2+，而与制备中所使用的氧化铜无关。 XANES结果表明，在所有样品中，铜的结构环境相对于氧气均为八面体。 HEXRD结果得出Cu-O最近邻距离为1.98埃，相关的配位数为约6，均与八面体配位相符。分析扩展的X射线吸收精细结构（EXAFS）数据还会得出与八面体环境中的铜一致的结构参数。 HEXRD和EXAFS结果显示Cu-P距离为3.13埃，这证实了铜离子在磷酸盐玻璃网络中是配位的，而在氧化铜域中没有相分离。 （c）2006 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号