Opportunities and Obstacles in LCTEM Nanoimaging – A Review

IF 6.1 Q1 CHEMISTRY, MULTIDISCIPLINARY Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-12-05 DOI:10.1002/cmtd.202300041
Tomasz Tarnawski, Prof. Magdalena Parlińska-Wojtan
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Abstract

Liquid Cell Transmission Electron Microscopy (LCTEM) is a great progression in nanostructure imaging, allowing the observation of chemical reactions in real time. It is widely reported, that this technique can be successfully used for analyzing nanoparticles synthesis, diffusion, aggregation and degradation. This gives a completely new insight into nanotechnological research. Normally, samples in TEM must be observed in vacuum, showing only the results of a performed experiment, whereas in situ observations in liquid environment provide information about the dynamics of the processes. LCTEM can show, how orientation of the particles/aggregates, surface roughness or solution flow rate influence the examined reaction. Those data are highly valuable for creating kinetic models of the reactions. There are however still some obstacles in LCTEM. Imaging of nanostructures in liquid environment is problematic since the electron beam reportedly may affect the observed sample. The beam modifies the temperature and pH of the liquid sample, changing the process dynamics. Therefore, its influence needs to be considered during in situ TEM observations. Nevertheless, LCTEM remains one of the highest achievements in the field of nanostructures imaging. In this review, recent achievements and developments of the LCTEM technique are presented.

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LCTEM 纳米成像的机遇与障碍 - 综述
液胞透射电子显微镜(LCTEM)是纳米结构成像技术的一大进步,可实时观察化学反应。据广泛报道,该技术可成功用于分析纳米粒子的合成、扩散、聚集和降解。这为纳米技术研究提供了全新的视角。通常,TEM 中的样品必须在真空中观察,只能显示实验结果,而在液体环境中的原位观察则能提供有关过程动态的信息。LCTEM 可以显示颗粒/聚集体的取向、表面粗糙度或溶液流速如何影响所研究的反应。这些数据对于建立反应动力学模型非常有价值。不过,LCTEM 仍然存在一些障碍。对液体环境中的纳米结构成像存在问题,因为据说电子束可能会影响观察到的样品。电子束会改变液体样品的温度和酸碱度,从而改变过程动态。因此,在原位 TEM 观察中需要考虑电子束的影响。尽管如此,LCTEM 仍然是纳米结构成像领域的最高成就之一。本综述介绍了 LCTEM 技术的最新成就和发展。
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