Ernst Jänecke

Ernst Georg Gustav Jänecke (born March 4, 1875 Altwarmbüchen , † January 4, 1957 in Heidelberg ) was a German chemist.

Life

The son of the court and brick factory owner in Altwarmbüchen Georg Friedrich William Jänecke (1831–1908) and Johanne Auguste Karoline, born. Warnecke (1844–1904), attended Realgymnasium I in Hanover . After graduating from high school in 1894, he began studying chemistry at the Technical University of Hanover and became a member of the Corps Macaro-Visurgia . In 1895 he moved to the Georg August University of Göttingen , in 1896 to the Ludwig Maximilians University in Munich and in 1897 to the Friedrich Wilhelms University in Berlin . His academic teachers included Carl Runge , Walther Nernst , Adolf von Baeyer and Jacobus Henricus van 't Hoff . In 1898 he was in Berlin with Emil Fischer Dr. phil. PhD. After his military service as a one-year volunteer in the Fusilier Regiment 73 in Hanover, he became an assistant at the inorganic chemical laboratory of the Technical University of Hanover in 1900. In 1905 he completed his habilitation in physical chemistry and became a private lecturer with a trial lecture on the chemistry of alloys. In 1912 he was appointed professor.

After the early and sudden death of his first wife Hedwig Smend (1886–1920), he left Hanover in 1920 and, on the mediation of Max Bodenstein , moved to BASF's research laboratory in Ludwigshafen am Rhein. At the Metallkunde Conference in Berlin in 1921 he met Liesel Velde (1895–1966), whom he married in the same year. They made their home in Heidelberg in 1921. In 1931 he was appointed full honorary professor for physical chemistry at the Ruprecht-Karls-Universität . In 1935 he retired from BASF and ended his experimental work. Until 1955 he gave lectures in Heidelberg.

The focus of his scientific work was in the field of phase theory. He developed the Jänecke diagrams , a method for representing the saturation ratios of complex salt solutions, and worked on alloys. At BASF, he did research on ammonium nitrate and other fertilizer salts. In total, he wrote over two hundred scientific publications.

His first marriage to Hedwig Smend had a daughter and two sons. The older son died in childhood, the younger died in World War II . From his second marriage to Liesel Velde there are three sons, the two older of whom also died in World War II.

Awards

• Dr.-Ing. E. h. RWTH Aachen University, 1930

Fonts

• About amidodiethyl ketone, amidodiethylcarbinol and some derivatives , 1898
• New form of representation of the aqueous solutions of two and three equi-ionic salts . In: Zeitschrift für Anorganische Chemie , 1906, Volume 51, pp. 132-156
• Saturated salt solutions from the point of view of phase theory , 1908
• The Royal Technical University , in Otto Hugo (Red): New Hanover. Festschrift of the Hannoversche Couriers for the consecration of the town hall in 1913 , Hannover: Gebrüder Jänecke, 1913, p. 50ff.
• The creation of the German potash storage facility , 1915, 2nd edition 1923
• News about the Alit , 1928
• About the regular four-dimensional five-cell (shown geometrically) , 1931
• Something about the Shrinking Earth , 1932
• Is the interior of the earth solid? , 1932
• About heterogeneous equilibria of chemical substances in science, nature and technology , 1934
• Abbreviated handbook of all alloys , 1937, 2nd edition 1949
• The world of chemical bodies at high and low temperatures and pressures , 1950

literature

• Jänecke, Ernst, G. In: Robert Volz: Reich manual of the German society . The handbook of personalities in words and pictures. Volume 1: A-K. Deutscher Wirtschaftsverlag, Berlin 1930, DNB 453960286 , p. 841.

Web links

• Jänecke, Ernst (1875–1957), chemist at www.kipnis.de

Individual evidence

1. ^ Address list of the Weinheimer SC. 1928, p. 182.