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Uncovering the Size-Dependent Thermal Solid Transformation of Akaganéite
Small ( IF 13.0 ) Pub Date : 2024-08-15 , DOI: 10.1002/smll.202402717 Xiang Wang 1 , Yang He 2, 3 , Lili Liu 1 , Duo Song 1 , Libor Kovarik 1 , Mark E Bowden 1 , Mark Engelhard 2 , Xiaoxu Li 1 , Yingge Du 1 , Quin Rs Miller 1 , Chongmin Wang 2 , James J De Yoreo 1, 4 , Kevin M Rosso 1 , Xin Zhang 1
Small ( IF 13.0 ) Pub Date : 2024-08-15 , DOI: 10.1002/smll.202402717 Xiang Wang 1 , Yang He 2, 3 , Lili Liu 1 , Duo Song 1 , Libor Kovarik 1 , Mark E Bowden 1 , Mark Engelhard 2 , Xiaoxu Li 1 , Yingge Du 1 , Quin Rs Miller 1 , Chongmin Wang 2 , James J De Yoreo 1, 4 , Kevin M Rosso 1 , Xin Zhang 1
Affiliation
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Investigating the structural evolution and phase transformation of iron oxides is crucial for gaining a deeper understanding of geological changes on diverse planets and preparing oxide materials suitable for industrial applications. In this study, in-situ heating techniques are employed in conjunction with transmission electron microscopy (TEM) observations and ex-situ characterization to thoroughly analyze the thermal solid-phase transformation of akaganéite 1D nanostructures with varying diameters. These findings offer compelling evidence for a size-dependent morphology evolution in akaganéite 1D nanostructures, which can be attributed to the transformation from akaganéite to maghemite (γ-Fe2O3) and subsequent crystal growth. Specifically, it is observed that akaganéite nanorods with a diameter of ∼50 nm transformed into hollow polycrystalline maghemite nanorods, which demonstrated remarkable stability without arresting crystal growth under continuous heating. In contrast, smaller akaganéite nanoneedles or nanowires with a diameter ranging from 20 to 8 nm displayed a propensity for forming single-crystal nanoneedles or nanowires through phase transformation and densification. By manipulating the size of the precursors, a straightforward method is developed for the synthesis of single-crystal and polycrystalline maghemite nanowires through solid-phase transformation. These significant findings provide new insights into the size-dependent structural evolution and phase transformation of iron oxides at the nanoscale.
中文翻译：
揭示 Akaganéite 尺寸依赖性热固相变
研究铁氧化物的结构演化和相变对于深入了解不同行星的地质变化和制备适合工业应用的氧化物材料至关重要。在这项研究中，采用原位加热技术与透射电子显微镜 (TEM) 观察和异位表征相结合，彻底分析不同直径的 akaganéite 一维纳米结构的热固相转变。这些发现为 akaganéite 一维纳米结构中尺寸依赖性形态演化提供了令人信服的证据，这可归因于从 akaganéite 到磁赤铁矿 (γ-Fe 2 O 3 ) 的转变以及随后的晶体生长。具体来说，观察到直径为~50 nm的akaganéite纳米棒转变为空心多晶磁赤铁矿纳米棒，在连续加热下表现出显着的稳定性而不会阻止晶体生长。相比之下，直径在20至8 nm范围内的较小的akaganéite纳米针或纳米线表现出通过相变和致密化形成单晶纳米针或纳米线的倾向。通过控制前体的尺寸，开发了一种通过固相转化合成单晶和多晶磁赤铁矿纳米线的简单方法。这些重要发现为纳米尺度氧化铁的尺寸依赖性结构演化和相变提供了新的见解。
更新日期：2024-08-15
中文翻译：
揭示 Akaganéite 尺寸依赖性热固相变
研究铁氧化物的结构演化和相变对于深入了解不同行星的地质变化和制备适合工业应用的氧化物材料至关重要。在这项研究中，采用原位加热技术与透射电子显微镜 (TEM) 观察和异位表征相结合，彻底分析不同直径的 akaganéite 一维纳米结构的热固相转变。这些发现为 akaganéite 一维纳米结构中尺寸依赖性形态演化提供了令人信服的证据，这可归因于从 akaganéite 到磁赤铁矿 (γ-Fe 2 O 3 ) 的转变以及随后的晶体生长。具体来说，观察到直径为~50 nm的akaganéite纳米棒转变为空心多晶磁赤铁矿纳米棒，在连续加热下表现出显着的稳定性而不会阻止晶体生长。相比之下，直径在20至8 nm范围内的较小的akaganéite纳米针或纳米线表现出通过相变和致密化形成单晶纳米针或纳米线的倾向。通过控制前体的尺寸，开发了一种通过固相转化合成单晶和多晶磁赤铁矿纳米线的简单方法。这些重要发现为纳米尺度氧化铁的尺寸依赖性结构演化和相变提供了新的见解。
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