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Free keywords:
Scanning electron microscopy;
Through-the-lens detection system;
Nano-materials;
Atmospheric SEM;
Metal-organic frameworks;
Mesoporous materials
Abstract:
Research concerning nano-materials (metal-organic frameworks (MOFs),
zeolites, mesoporous silicas, etc.) and the nano-scale, including
potential barriers for the particulates to diffusion to/from is of
increasing importance to the understanding of the catalytic utility. of
porous materials when combined with any potential super structures (such
as hierarchically porous materials). However, it is difficult to
characterize the structure of for example MOFs via X-ray powder
diffraction because of the serious overlapping of reflections caused by
their large unit cells, and it is also difficult to directly observe the
opening of surface pores using ordinary methods. Electron-microscopic
methods including high-resolution scanning electron microscopy (HRSEM)
have therefore become imperative for the above challenges. Here, we
present the theory and practical application of recent advances such as
through-the-lens detection systems, which permit a reduced landing
energy and the selection of high-resolution, topographically specific
emitted electrons, even from electrically insulating nano-materials. (c)
2014 Elsevier Ltd. All rights reserved.
