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Characterisation of insulating fibres and powders

Characterisation of insulating fibres and powders

Techniques: ‘wet’ (low-pressure) mode imaging, EDX spectroscopy

insulating firbres

Summary: In conventional SEM, the observation of insulating samples needs to deposit a gold or carbon coating on the sample surface to make it conductive. Direct observation of such samples without Au/carbon coating is available in the Philips XL-30 ESEM and the Nova200 NanoSEM when the instruments are operated under ‘wet’ mode. The upper micrograph shows wool fibres having alumina-type contaminating particles, both of them being electric-insulating. The Al2O3 contaminants were confirmed by EDX chemical analysis. The lower image shows sub-micron features of a refractory material powder of rare earth oxide. EDX spectroscopy showed chemical contents of the oxide mixture including O, La, Ce and Pr.

For more information on our SEM services relating to research and consultancy, please contact Dr. Quanshun Luo

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