Atmosphere TEM Environmental Gas Cell

The Atmosphere TEM Environmental gas cell converts nearly any TEM into a fully featured ETEM (Environmental TEM). The system creates an in situ reaction chamber inside the microscope; This enables atomic resolution at temperatures up to 1000 °C and pressures up to one atmosphere or 760 Torr. Atmosphere is a fully automated system controlled by the powerful Clarity™ software suite which makes temperature and pressure control easy and safe. The software offers both static and flowing modes so it can control dynamic environments with changing temperatures and pressures in either flowing or static gas conditions. The system is easy to use, yet powerful and flexible enough to support applications ranging from heterogeneous catalysis reactions to in situ nanomaterial synthesis and growth. Atmosphere is also safe to use in your TEM. It is the only gas cell system tested and approved by FEI and JEOL for use on their entire line of transmission electron microscopes. With both closed-loop temperature control and computer-controlled gas handling, it delivers results you can trust.

The Atmosphere TEM Environmental Gas Cell Advantage

▶Click the image

The Atmosphere Key Features

 ▶ Image under realistic conditions with temperatures up to 1000 °C and pressures up to 1 atm

 ▶ Closed-loop temperature control for accurate temperatures even in changing pressure and gas composition

 ▶ Clarity software provides automated gas handling and safety features

 ▶ OEM approved for safety and compatibility

Atmosphere TEM
Environmental Gas Cell
Case Study

Novel Catalyst Structure Dynamics Captured at the Atomic Scale

Nanoparticles are a primary focus for catalysis. Their high surface-to volume-ratio maintains high catalyst activity with less material. However, nanoparticles sinter at low temperatures, which reduces surface area and activity.

Significant effort has been focused on increasing the temperature stability of nanoparticles. One method encapsulates palladium nanoparticles with ceria on silicon functionalized alumina. This material has shown excellent catalyst activity, but it was not understood why.

In situ electron microscopy using Protochips’ Atmosphere directly showed that when the material was calcined at temperatures between 500 and 800 °C, it underwent an interesting transition. Large agglomerates were created, along with very small species of palladium and ceria.

The researchers postulated that the small species are responsible for the high catalytic activity, and are stabilized by silicon. Shuyi Zhang, lead author on the study, stated that “Without in situ observation, the dynamic structural evolution is unlikely envisioned by any ex situ method, and more importantly, this finding may open new perspectives about the origin of the activity of this catalyst.”

 

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