结合多模热传递分析冷性EXLO操纵的结合多模热传递分析
Kyle W Beggs1, Alain J Kassab1, Michael Colletta2
1Centecorp LLC, 147 Parsons Rd, Longwood, FL 32779, USA.
概括
使用低温聚焦离子束 (FIB) 研磨的标本在使用液冷却时,会无限期保持玻璃状. 它们在冷却停止后保持冷超过3分钟,确保成功的冷转移用于冷传输电子显微镜.
科学领域:
- 材料科学 材料科学 材料科学
- 低温电子显微镜 低温电子显微镜
- 热传递热量转移的方法
背景情况:
- 低温聚焦离子束 (FIB) 研磨对于制备用于低温传输电子显微镜 (cryo-TEM) 的样品至关重要.
- 在样本准备和转移期间保持玻璃化状态对于高分辨率的冷TEM成像至关重要.
研究的目的:
- 为了进行冷FIB削的联合辐射/导电多模式传热分析.
- 在低温条件下的ex situ提升 (EXLO) 过程中确定标本的热稳定性.
主要方法:
- 利用有限体积法进行过渡热导分析.
- 在辐射传热计算中采用封闭理论.
- 模拟了主动冷却和随后的升温阶段,以评估样本去玻璃化时间.
主要成果:
- 标本在活性冷却液和接触FIB沟时,会保持无限期的玻璃状.
- 在关闭主动冷却后,标本保持其玻璃状状态超过3分钟.
- 这一持续时间明显超过了冷-FIB和冷-EXLO冷机之间所需的约10秒的传输时间.
结论:
- 热传递分析证实了冷EXLO样本制备的可行性.
- 在保持样本玻璃化的情况下,可靠地执行冷FIB削和随后的转移步骤.
- 准备好的酵母样本的冷TEM图像证实了传热分析的发现.
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