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  1. Synthetic Sapphire (1956 Film)

    Subject
    Chemistry
    Distribution
    Film (16mm)

    Examples of synthetic sapphires in use. The manufacturing process. Ammonium alum is reduced in a furnace to aluminium oxide. After sifting through fine gauze the powder is melted in an oxyhydrogen flame in a...

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  2. Tantalum Pentoxide (2014)

    Subject
    Chemistry

    Podcast in which Lars Öhrström reveals the hidden chemistry inside modern mobile phones and the reason why current models are so much slimmer than the brick-sized models from the 1980s. Tantalum Pentoxide...

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