H-1, Si-29 and Al-27 NMR study of the destabilization process of a paracrystalline opal from Mexico

Paris M; Fritsch E; Reyes BOA

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 >H-1, Si-29 and Al-27 NMR study of the destabilization process of a paracrystalline opal from Mexico

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H-1, Si-29 and Al-27 NMR study of the destabilization process of a paracrystalline opal from Mexico

机译：H-1，Si-29和Al-27 NMR对来自墨西哥的准晶体蛋白石去稳定过程的研究

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This is the first NMR study of the destabilization through whitening of paracrystalline opal-CT (SiO2, nH(2)O). The aim of this study is to understand the process leading to the degradation, particularly any changes in the structure and bonding of this material. Si-29 and Al-27 NMR signals are not significantly modified. In contrast, using for the first time H-1 as a probe in opal, we show that a comprehensive understanding can be obtained on both the local structure of the opal-CT and the destabilization process. Thus, we propose the latter is related to some changes in 1H speciation (loss of strongly 'bound' water and appearance of new species) which induce structural reorganizations on the surface and in the rim of the silica nanograins constituting opal-CT. (C) 2007 Elsevier B.V. All rights reserved.

机译：这是通过变晶蛋白石-CT（SiO2，nH（2）O）的增白去稳定作用的第一个NMR研究。这项研究的目的是了解导致降解的过程，尤其是这种材料的结构和键合的任何变化。 Si-29和Al-27 NMR信号没有明显改变。相比之下，首次使用H-1作为蛋白石的探针，我们表明可以对蛋白石CT的局部结构和去稳定过程获得全面的了解。因此，我们建议后者与1H形态的某些变化（强烈的“结合”水的流失和新物种的出现）有关，这些变化会引起构成蛋白石CT的二氧化硅纳米颗粒的表面和边缘的结构重组。（C）2007 Elsevier B.V.保留所有权利。

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《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》 |2007年第17期|共7页
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Paris M; Fritsch E; Reyes BOA;
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正文语种 eng
中图分类晶体学;
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silica; NMR; MAS-NMR and NQR; short-range order; hydration; water; NUCLEAR-MAGNETIC-RESONANCE; ANGLE-SPINNING NMR; MAS NMR; ROTATING SOLIDS; SURFACE; WATER;

机译：硅胶;NMR;MAS-NMR和NQR;短程有序;水合;水;核磁共振;角纺NMR;MAS NMR;旋转固体;表面;水;

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1. H-1, Si-29 and Al-27 NMR study of the destabilization process of a paracrystalline opal from Mexico [J] . Paris M, Fritsch E, Reyes BOA 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 . 2007,第16a17期

机译：H-1，Si-29和Al-27 NMR对来自墨西哥的准晶体蛋白石去稳定过程的研究
2. Si-29 and Al-21 NMR study of amorphous and paracrystalline opals from Australia [J] . Brown LD., Ray AS., Thomas PS. 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 . 2003,第1a3期

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机译：a（e，e'pi（+））[a（e，e prime pi上标+）]对H-1 [上标1 H]，H-2 [上标2 H]，C-12反应的实验研究[上标12 C]，al-27 [上标27 al]，Cu-63 [上标63 Cu]和au-197 [上标197 au]

H-1, Si-29 and Al-27 NMR study of the destabilization process of a paracrystalline opal from Mexico

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