Zsigmondy, Richard Adolf

Richard Zsigmondy received the 1925 Nobel Prize in chemistry for his elucidation of the nature of colloidal suspensions. With Henry Siedentopf (1872-1940), he invented, used, and promoted the ultramicroscope. Zsigmondy and others used ultramicroscopic studies of colloidal suspensions to 

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The tiny particles in colloidal gold were not seen directly until the early twentieth century, when the Austrian chemist Richard Adolf Zsigmondy invented the ultramicroscope, a device capable of resolving such small objects. For elucidating the nature of colloids Zsigmondy was awarded the Nobel Prize in chemistry in 1925. 

Austrian chemist Richard Adolf Zsigmondy, recipient of the 1925 Nobel Prize in chemistry, for his demonstration of the heterogeneous nature of colloid solutions and for the methods he used, which have since become fundamental in modern colloid chemistry. ... 

Richard Adolf Zsigmondy (1865-1929). .. was an Austrian-Hungarian chemist who developed the ultramicroscope in 1903 (together with Siedentopf), which allowed a visualisation of very fine colloidal particles (like in gold sols) for the first time and, thus, inspired scientist like Perrin to do detailed studies of colloidal materials. A further achievement was the invention of the membrane filter (together with Bachmann). For his demonstration of the heterogeneous nature of colloid solutions and for the methods he used, which are fundamental to modem colloid chemistry , he was rewarded the Nobel Prize in Chemistry in 1925. 

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