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Frederick George Donnan (born Sept. 5, 1870, Colombo, Ceylon [now Sri Lanka]—died Dec. 16, 1956, Canterbury, Kent, Eng.) was a British chemist whose work was instrumental in the development of colloid chemistry. Donnan was educated at Queen’s College in Belfast, N.Ire., and at the Universities of Leipzig, Berlin, and London. From 1904 to 1913 he taught at the University of Liverpool, and from 1913 to his retirement in 1937 he was professor of chemistry at...