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- W2783447056 abstract "The external skeleton, frustule, of a diatom is composed of hydrous amorphous silica and amino acids. In this study, the structural changes in the frustule of Chaetoceros calcitrans after thermal treatment up to 1200 °C were investigated using X-ray diffraction and attenuated total reflection infrared spectroscopy and Raman spectroscopy. Their structural changes after thermal treatment give important information to elucidate the unheated structure of the frustule and its crystallization process. In addition, this study is almost the first report to discuss the structure of diatom frustule in detail with Raman spectrum. The unheated structure of the frustule has the relatively ordered and dominant six-membered ring structure made of SiO4 tetrahedra. The sample heated at 800 °C has the more ordered six-membered ring structure observed in quartz or cristobalite. Water molecules and silanol (Si–OH) included in the frustule are dehydrated at this temperature. This dehydration may promote the formation of ordered and polymerized structure. The structure of the frustule after heating at 1200 °C is similar to that of low-cristobalite. However, additional heating is required for complete crystallization." @default.
- W2783447056 created "2018-01-26" @default.
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- W2783447056 date "2018-01-12" @default.
- W2783447056 modified "2023-09-24" @default.
- W2783447056 title "Structural change of the frustule of diatom by thermal treatment" @default.
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- W2783447056 doi "https://doi.org/10.1186/s40562-018-0101-3" @default.
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