マルチチャンネル・ガス

Multi-modal in-situ gas/heating environments for TEM and X-ray microscopy

マルチチャンネル・ガス
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技術仕様

TEM Sample Holder - Gas Flow - FEI Model
1300 Series – Multi-Channel
Pressure Range at Sample 10-6  mbar up to 2 bar
Experimental Gas or Vapor Inlets 3–8*
Purge Capability Yes
Integrated Gas Analysis Capability Yes
Tubing System
 All Metal
Biasing Contacts
 4 contacts
Heating Temperature
 >1000°C
Holder Cleaning Bakeable to 160° C
EELS / EDS Compatible Yes
TEM Compatibility TFS/FEI, JEOL, Hitachi, Zeiss

* Contact us for Custom Configurations

特徴

注目の研究

高エントロピー合金ナノ触媒の高温還元反応の、その場TEM観察

気体と個体の原子レベルにおける相互作用は、様々な触媒材料の作用メカニズムを理解する上で重要である。特に5種以上の元素を原子レベルで混合した、高エントロピー合金（HEA）の場合が顕著です。イリノイ大学シカゴ校（UIC）、アルゴンヌ国立研究所（ANL）、ピッツバーグ大学、カリフォルニア大学リバーサイド校、ノースウェスタン大学の研究チームは、当社のガスフロー・ホルダーを用いて、FeCoN-iCuPt HEAの酸化および還元挙動を、400°Cの空気および水素ガス中でそれぞれ実験観察しました。400°Cの空気中で粒子を加熱すると、粒子の周囲に酸化膜の成長が見られます。水素ガスを導入することで酸化膜はさらに膨張し、多孔質構造に変化しました。そして、すべての遷移金属（Fe、Co、Ni、Cu）が外部に拡散されることを確認しました。今回発表された研究内容は、触媒用途に向けた新しい部類の合金ナノ粒子に関する基礎的な洞察を与えるものです。

Image Copyright © 2021 American Chemical Society

Reference: Song et al. Nano Lett. 2021, 21, 4, 1742–1748.  DOI: 10.1021/acs.nanolett.0c04572

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Video Spotlight

Kirkendahl effect in Co nanoparticles


These experiments show the changes in nanoparticle morphology during in-situ TEM oxidation of Co nanoparticles in oxygen at elevated temperatures. These kind of in-situ TEM observations  are crucial in understanding of the fundamental relationships involved in catalytic activity in these materials.

Left: Movie of the formation of hollow core oxide shells when Co nanoparticles are heated from 150°C to 250°C in 1 bar of flowing oxygen.

Reference: H.L. Xin, K. Niu, D.H. Alsem and H. Zheng.  “In-Situ TEM Study of Catalytic Nanoparticle Reactions in Atmospheric Pressure Gas Environment,” Microscopy & Microanalysis 19 (2013) pp. 1558. Abstract

Copyright © Microscopy Society of America, 2013

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