Raphael Eduard Liesegang
Raphael Eduard Liesegang ( pseudonyms: Ahriman, Ganga Raphael, Raphael Eduard Ganga, A. Helheim, Julius Raphael, born November 1, 1869 in Elberfeld, † November 13, 1947 in Bad Homburg ) was a German chemist and writer. He worked in the field of colloid chemistry and is regarded as the discoverer of Liesegang rings.
Life
During his school years, in which he had major weaknesses in reading and writing and had to repeat a grade, it was Liesegang desire to become a painter. Since his father, who photochemist Eduard Liesegang (1838-1896), but was strongly opposed to this career choice that son gave this soon.
As a result, he finished in Grönebach a course on photography and then moved for a year to Carl Remigius Fresenius in Wiesbaden, where he took a course in analytical chemistry. In this course, Liesegang was awakened interest in chemistry and so he began in 1888 to study chemistry in Freiburg im Breisgau. Despite the lack of interest for the lectures he wrote during the semester break scientific papers on light -sensitive organic silver salts in the Photographic Archive ( 1888) and contributions to the problem of ELECTRICAL television ( 1891).
Without financial statements, since he did not go to lectures and examinations took off, he began in 1892 in the photographic factory of his father to work in Elberfeld ( Ed. Liesegang oHG ). Here he developed in 1892 the first matte Zelloidinpapier and hydroquinone developer Aristogen. He dealt with the problems of photography and published a number of papers on his research. He reported in 1896 on periodic precipitation phenomena in gels, which were later named by Wilhelm Ostwald Liesegangsche rings. Liesegangsche rings can also be found in nature ( see image ). On the Phenomenon of geological diffusion he published in 1913 a book.
When his father died in 1896, Raphael Liesegang and two of his brothers took over the factory. He turned first to the manual preparation of Zelloidinpapieres on machine preparation, which his father had previously always rejected. As Farbenfabriken Friedrich Bayer & Co. in Leverkusen showed interest in the photographic paper and developer department, he sold this part of the company in 1907, which later became the oldest part of Agfa. The optical department was continued by his brothers in Dusseldorf, while Raphael Liesegang retired from the company. The company was forced to declare bankruptcy in 2002.
In 1908, Liesegang went to the Senckenberg Museum in Frankfurt, where he managed the Neurological Institute to make the fine branches of the neurons in the brain visible.
Due to the recognition of his scientific work, he was after the First World War Staff at the Kaiser Wilhelm Institute for Biophysics in Frankfurt am Main, 1937, he took over the Institute of Colloids research. In 1944 the Institute was moved to Bad Homburg.
Raphael Liesegang came alongside his work as a chemist also - partly under a pseudonym - as a writer of plays and philosophical treatises produced.
After he drew upon a cold, he died unexpectedly - the day before he had been working at the Institute - on the evening of November 13, 1947.
Awards
1929 Laura R. Leonard Price
Others
According to him, the Raphael Eduard Liesegang price of Colloid Society was named.
Writings
- Problems of the present, Dusseldorf 1 Contributions to the problem of ELECTRICAL television, 1891
- 2 Monism and its consequences, 1892
Editorship
- Colloid Chemical Technology, Dresden 1927
- Medical colloid theory, Dresden [ua ] 1935 (edited together with Leopold Lichtwitz and Karl Spiro )