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Interest in nanoscience and nanotechnology in South Africa is strong and has received further momentum with the recent launch of the National Nanoscience Postgraduate Teaching and Training Programme. Nanotechnology is generally considered to be a relatively new field and so it may surprise some that the year 1912 has recently been proposed for the birth of modern nanotechnology, to coincide with the invention of the immersion ultra microscope by Zsigmondy. Although modern microscopes have atomic resolution, the average size of nanoparticles is routinely estimated from the width of X-ray diffraction pattern peaks using a simple equation first published by Scherrer in 1918. In fact, the size of gold nanoparticles determined by Scherrer substantially confirmed the pioneering work of Zsigmondy.

Nanoscience and the Scherrer equation versus the ‘Scherrer–Gottingen equation’