揭示一维赤铁矿二氧化钛的热稳定性和水稳定性
Unveiling the Thermal and Aqueous Stability of 1D Lepidocrocite Titania
AI总结：
研究揭示一维赤铁矿二氧化钛纤维在高温和水环境中稳定性变化，发现其在300度以上发生结构变化，并在水存储中转化为锐钛矿纳米颗粒。
摘要：
一维赤铁矿二氧化钛纤维的热稳定性和水稳定性被研究。通过真空传输电镜中进行的原位加热结合电子能损谱，以及在常温下使用拉曼光谱学，研究了结构和相变。纤维在300度以上仍保持赤铁矿结构，超过此温度时，纤维重叠接头处出现局部烧结和非晶化。进一步加热后，非晶区域结晶为锐钛矿，拉曼光谱证实了结构紊乱的开始。长期在常温下水存储长达100天，导致转化为类片状锐钛矿纳米颗粒。在冷藏存储下，此过程被强烈抑制，相同时间内未观察到结构变化。这些结果确立了关键的热和环境稳定性阈值，定义了一维赤铁矿纤维新兴应用的操作优势和限制。
英文摘要：
One dimensional lepidocrocite titanium dioxide filaments are investigated with respect to their thermal and aqueous stability. Structural and phase evolution are examined using in situ heating in vacuum within transmission electron microscopy combined with electron energy loss spectroscopy, and at ambient conditions using Raman spectroscopy. The filaments retain their lepidocrocite structure up to 300 degree and above which localized sintering and amorphization occur at filament overlap junctions. With further heating, the amorphous regions crystallize into anatase, with Raman spectroscopy corroborating the onset of structural disorder. Long term aqueous storage up to 100 days at ambient conditions induces transformation into flake like anatase nanoparticles. This process is strongly suppressed under refrigerated storage, where no structural changes are observed over the same period. These results establish critical thermal and environmental stability thresholds that define operational advantages and limits for emerging applications of 1D lepidocrocite filaments.
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