Karl Fredenhagen
Karl Hermann Heinrich Philipp Fredenhagen (born May 11, 1877 in Loitz , † April 4, 1949 in Greifswald ) was a German physical chemist .
Life
Karl Fredenhagen was the son of the businessman and senator August Fredenhagen and his wife Caroline nee Schultz. His grandson is the theoretical (mathematical) physicist Klaus Fredenhagen . He studied at the universities of Hanover , Darmstadt , Leipzig and Göttingen . In 1901 he received his doctorate in Göttingen with Walther Nernst with a thesis on the theory of oxidation and reduction chains and then worked as an assistant to H. Th. Simon. He later worked as an assistant to Wilhelm Ostwald and Theodor des Coudres in Leipzig . There he completed his habilitation in physical chemistry in 1906. The following year, he received the instructor for physics . In 1923 he took up the chair for physical chemistry at the University of Greifswald , which he held until 1945.
Fredenhagen's main research interests were the causes of solubility and electrolytic dissociation in liquid solutions. He carried out successful experimental investigations into the properties of solute in aqueous and non-aqueous solvents and, unlike many of his colleagues, saw solubility as a more chemical and less a physical problem. Among the non-aqueous solvents he devoted himself particularly to hydrogen fluoride . In 1928, he reported a "method for the electrowinning of fluorine " for patent on. The summary of his theory of binary systems that he had elaborated was published posthumously in 1950 . He is also one of the discoverers of KC 8 .
Fonts
- Basics for building a theory of binary systems. With a biographical introduction by Kurt Wiechert. Akademie-Verlag, Berlin 1950.
literature
- Gerhard Jung: Fredenhagen, Karl. In: New German Biography (NDB). Volume 5, Duncker & Humblot, Berlin 1961, ISBN 3-428-00186-9 , p. 386 f. ( Digitized version ).
Web links
- Literature about Karl Fredenhagen in the state bibliography MV
- Overview of Karl Fredenhagen's courses at the University of Leipzig (winter semester 1906 to summer semester 1914)
- Karl Fredenhagen in the professorial catalog of the University of Leipzig
Individual evidence
- ↑ Alma mater Gryphiswaldensis - a university with tradition -
- ^ Production of Elemental Fluorine
- ^ Karl Fredenhagen, Gustav Cadenbach: The binding of potassium by carbon . In: Journal of Inorganic and General Chemistry . tape 158 , no. 1 , November 23, 1926, ISSN 0863-1786 , p. 249-263 , doi : 10.1002 / zaac.19261580122 ( wiley.com ).
| personal data | |
|---|---|
| SURNAME | Fredenhagen, Karl |
| ALTERNATIVE NAMES | Fredenhagen, Karl Hermann Heinrich Philipp (full name) |
| BRIEF DESCRIPTION | German physical chemist |
| DATE OF BIRTH | May 11, 1877 |
| PLACE OF BIRTH | Loitz |
| DATE OF DEATH | April 4, 1949 |
| Place of death | Greifswald |