Richard Adolf Zsigmondy was an Austrian-born chemist. He was known for his research in colloids, for which he was awarded the Nobel Prize in Chemistry in 1925, as well as for co-inventing the slit-ultramicroscope, and different membrane filters. The crater Zsigmondy on the Moon is named in his honour. The Nobel Prize in Chemistry 1925, announced November 11, 1926. Richard Zsigmondy, “for his demonstration of the heterogenous nature of colloid solutions and for the methods he used, which have since become fundamental in modern colloid chemistry”. Richard Zsigmondy: born 1865, Vienna, Austrian Empire (now Austria). Wiki link Data: the Nobel Foundation (CC0).