CFD modelling of gas flow characteristics for the gas‐heating holder in environmental transmission electron microscope

Zhao, Zhi‐Jian; Wang, Zhiyong; Wang, Dan; Wang, Jie‐Xin; Pu, Yuan; Chen, Jianfeng

doi:10.1002/cjce.23217

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…The mechanism behind the process was further explored using an E-TEM with a tailor-designed sample loading attachment, as shown in Figure a. The main part of the holder consists of a spiral-shaped tungsten wire and a gas injection nozzle made of alloy . By enhancing the electrical current that flows through the tungsten wire, the sample could be heated in the range of room temperature to 1500 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The main part of the holder consists of a spiral-shaped tungsten wire and a gas injection nozzle made of alloy. 32 By enhancing the electrical current that flows through the tungsten wire, the sample could be heated in the range of room temperature to 1500 °C. The gas injection nozzle was designed to pump CO 2 , H 2 , O 2 , or mixed gas for the in situ observation of the gas−solid reaction.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Real-Time Imaging and Quantitative Evolution for Pyrolysis of Carbon Dots-Encapsulated Metal–Organic Frameworks at the Nanoscale by In Situ Environmental Transmission Electron Microscopy

Wang

Zhao

Shi

et al. 2023

ACS Appl. Mater. Interfaces

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The pyrolysis of metal−organic frameworks (MOF) has been widely used approach to generate hierarchical structures with the corresponding metal, metal carbide, or metal oxide nanoparticles embedded in a porous carbon matrix with a high specific surface area for industrial catalysis, energy storage and transfer, etc. MOF-derived heterogeneous catalysts can be constructed by the encapsulation of carbon dots (CDs) with plenty of hydroxyl and amine groups to enhance the performance of the final product. Controlled formation of metallic carbon structures at the nanoscale, especially matter cycling and transformation on the nanoscale interface, is important for the production of industrial catalysts as well as the research of materials science and engineering progress. However, the mass transfer at the nanoscale during the processing of MOF pyrolysis remains less understood due to the lack of direct observation. Herein, by using in situ environmental transmission electron microscopy, real-time imaging and quantitative evolution of porous carbon decorated with metal species by the pyrolysis of CDs-encapsulated zeolitic imidazolate framework-67 are achieved. The migration of Co, the flow of aggregates, and the growth of carbon nanotubes observed in the nanoscale pyrolysis laboratory working at 600 °C with an air atmosphere are present. Experimental studies based on reduction and oxidation reaction models reveal that the synergistic effect between doped graphite nitrogen and confined Co nanoparticles is beneficial for boosting catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Real-Time Imaging and Quantitative Evolution for Pyrolysis of Carbon Dots-Encapsulated Metal–Organic Frameworks at the Nanoscale by In Situ Environmental Transmission Electron Microscopy

Wang

Zhao

Shi

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

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“…One method involves using a furnace-type holder to heat the entire TEM grid to 1000 • C, which results in serious thermal drift [28]. Another way is to use a tungsten wire to introduce a heated field, which raises the temperature to 1500 • C. In this approach, the powder sample is coated on the surface of the tungsten wire [29]. However, the drawback is that the visible area of samples is limited.…”

Section: Introductionmentioning

confidence: 99%

Advanced In Situ TEM Microchip with Excellent Temperature Uniformity and High Spatial Resolution

Zhang,

Zhou,

Chen

et al. 2023

Sensors

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Transmission electron microscopy (TEM) is a highly effective method for scientific research, providing comprehensive analysis and characterization. However, traditional TEM is limited to observing static material structures at room temperature within a high-vacuum environment. To address this limitation, a microchip was developed for in situ TEM characterization, enabling the real-time study of material structure evolution and chemical process mechanisms. This microchip, based on microelectromechanical System (MEMS) technology, is capable of introducing multi-physics stimulation and can be used in conjunction with TEM to investigate the dynamic changes of matter in gas and high-temperature environments. The microchip design ensures a high-temperature uniformity in the sample observation area, and a system of tests was established to verify its performance. Results show that the temperature uniformity of 10 real-time observation windows with a total area of up to 1130 μm2 exceeded 95%, and the spatial resolution reached the lattice level, even in a flowing atmosphere of 1 bar.

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In‐Situ Gas–Solid Interactions

2023

In‐Situ Transmission Electron Microscopy Experiments

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CFD modelling of gas flow characteristics for the gas‐heating holder in environmental transmission electron microscope

Cited by 5 publications

References 39 publications

Real-Time Imaging and Quantitative Evolution for Pyrolysis of Carbon Dots-Encapsulated Metal–Organic Frameworks at the Nanoscale by In Situ Environmental Transmission Electron Microscopy

Real-Time Imaging and Quantitative Evolution for Pyrolysis of Carbon Dots-Encapsulated Metal–Organic Frameworks at the Nanoscale by In Situ Environmental Transmission Electron Microscopy

Advanced In Situ TEM Microchip with Excellent Temperature Uniformity and High Spatial Resolution

In‐Situ Gas–Solid Interactions

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