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Proceedings of the European Microscopy Congress 2020最新文献

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Dehydrogenation Kinetics of Mg2FeH6 by In-situ Transmission Electron Microscopy 原位透射电镜研究Mg2FeH6脱氢动力学
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.1094
Juyoung Kim
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引用次数: 0
Engineering illumination modes in X-ray ptychography x射线照相术中的工程照明模式
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.668
Yangyang Mu
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引用次数: 0
On the Dependence of the Sensitivity of EELS vs XEDS in the AEM with Thickness and Beam Energy AEM中EELS与XEDS灵敏度随厚度和束流能量的关系
Pub Date : 2021-03-01 DOI: 10.22443/RMS.MMC2021.257
N. Zaluzec
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引用次数: 1
Coulomb Interactions in High-Coherence Femtosecond Electron Pulses from Tip Emitters 高相干飞秒电子脉冲的库仑相互作用
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.1013
N. Bach
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引用次数: 0
The Coalescence Behavior of Two-Dimensional Materials Revealed by Multiscale In Situ Imaging during Chemical Vapor Deposition Growth 化学气相沉积生长过程中二维材料多尺度原位成像的聚结行为
Pub Date : 2021-03-01 DOI: 10.1021/acsnano.9b08221.s002
Zhu-Jun Wang
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引用次数: 7
A transmission electron microscopy study of discontinuous precipitation in the high misfit system (Ti,Zr)C 高失配体系(Ti,Zr)C中不连续析出的透射电镜研究
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.1225
Prasath Babu Revathy Rajan
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引用次数: 0
Label-free spatio-temporal monitoring of cytosolic mass, osmolarity, and volume in living cells 活细胞中细胞质质量、渗透压和体积的无标记时空监测
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.1451
Daniel Midtvedt
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引用次数: 0
Quantitative 3D Reconstruction of Porous Polymers for Controlled Drug Release using FIB-SEM Tomography 利用FIB-SEM断层扫描定量三维重建多孔聚合物控释药物
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.1446
C. Fager
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引用次数: 0
Wigner Distribution Deconvolution for ptychography: blind solution of the illumination function ptyography的Wigner分布反卷积:照明函数的盲解
Pub Date : 2021-03-01 DOI: 10.22443/RMS.EMC2020.667
Wen-bo Mei
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引用次数: 0
Correlative cathodoluminescence and EDS imaging of the benthic agglutinated foraminifer Liebusella goesi 底栖凝集有孔虫的相关阴极发光和能谱成像
Pub Date : 2020-03-09 DOI: 10.5194/egusphere-egu2020-20478
S. Hari, S. Littmann, N. Glock, J. von Arx, T. Coenen, Alexandra-Sophie Roy

Sedimentary rocks, formed by the accumulation of mineral and organic particles, are important both for studies of the earth’s history as well as for being a source of fossil fuels. Over the course of the last decades, it has been demonstrated that scanning electron microscope (SEM)-based cathodoluminescence (CL) spectros­copy is a valuable technique for the characterisation of sedimentary rocks, complementary to other electron microscopy-based techniques, such as backscattered electron imaging (BSE/EBSD) and energy dispersive x-ray spectroscopy (EDS). Typically the CL yield is high enough for rapid scanning and, in some cases, even video-rate scanning, allowing fast in­spection of relatively large areas. It can be used to quantitatively map the quartz composition of the sample, for example, which enables the rigorous segmentation of granular and cemented material.

Textulariid benthic foraminifers live on and in seafloor sediments and form shells of agglutinated sediment particles. They are very important biostratigraphic markers, and fossil agglutinated foraminifera are important archives for paleoceanographic reconstructions. Furthermore, living textulariids show a strong diversity, populating  a diverse range of marine habitats partly and can reach high living abundances, making them important for benthic ecosystems.

In this work, we show how CL spectroscopy can be employed to study agglutinated foraminifera using the species Liebusella goesi from the Swedish Gullmar Fjord as an example. Fast panchromatic imaging using a photomultiplier tube was performed over a large area of the foraminifera, which revealed textures and contrasts of interest in the shell (test). A high resolution SEM image was acquired simultaneously to provide spatial context. Such a dataset can be valuable in establishing the geological history as well as in identifying the chemical composition of the cement used for the agglutination of sediment particles. Both the composition of the agglutinated particles and the chemical composition of the cement might bear valuable information about the environmental conditions, when the test was formed. EDS measurements were performed, revealing the spatial distribution of elements such as potassium, calcium, sodium, silicon and oxygen, in the sediment particles of the shell. This was useful in indicating the presence of minerals such as quartz and feldspar, and hyperspectral CL imaging was performed to rigorously identify them, and to visualize intragranular features, not visible in the EDS data. Based on the CL spectral data, we were further able to identify different grades/types of quartz and feldspars. These results show that these foraminifera prefer different sediment materials with varying grain sizes, depending on the size of the newly formed chamber, to achieve the highest mechanical stability.

沉积岩是由矿物和有机颗粒堆积而成的,对研究地球历史和化石燃料的来源都很重要。在过去的几十年里,已经证明基于扫描电子显微镜(SEM)的阴极发光(CL)光谱复制是沉积岩表征的一种有价值的技术,与其他基于电子显微镜的技术,如背散射电子成像(BSE/EBSD)和能量色散x射线光谱学(EDS)互补。一般来说,CL产率足够高,可以进行快速扫描,在某些情况下,甚至可以进行视频速率扫描,从而可以对相对较大的区域进行快速扫描。例如,它可以用于定量绘制样品的石英成分,从而可以对颗粒状和胶结材料进行严格的分割。本质底栖有孔虫生活在海底沉积物上和里面,形成粘连的沉积物颗粒的壳。它们是非常重要的生物地层标志,化石凝集有孔虫是古海洋重建的重要档案。此外,生物类群表现出很强的多样性,种群数量为 多种多样的海洋栖息地部分和可以达到较高的生物丰度,使它们对底栖生态系统很重要。在这项工作中,我们以瑞典Gullmar峡湾的Liebusella goesi为例,展示了CL光谱如何用于研究凝集有孔虫。使用光电倍增管对有孔虫的大面积进行快速全色成像,揭示了壳中感兴趣的纹理和对比度(测试)。同时获得高分辨率的扫描电镜图像,以提供空间背景。这样的数据集在建立地质历史以及确定用于沉积物颗粒粘合的水泥的化学成分方面是有价值的。胶凝颗粒的组成和水泥的化学成分都可能提供有关试验形成时环境条件的宝贵信息。通过能谱仪测量,揭示了贝壳沉积物颗粒中钾、钙、钠、硅和氧等元素的空间分布。这有助于表明石英和长石等矿物的存在,并进行高光谱CL成像来严格识别它们,并显示在EDS数据中不可见的颗粒内特征。根据CL光谱数据,我们进一步能够识别不同等级/类型的石英和长石。这些结果表明,这些有孔虫根据新形成腔室的大小,选择不同粒度的不同沉积物材料,以达到最高的机械稳定性。
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引用次数: 0
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Proceedings of the European Microscopy Congress 2020
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