Peter Petrovich von Weymarn (commonly mis-spelt ''von Weimarn'') (July 17, 1879 – June 2, 1935) was a

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...

known for his groundwork in

colloid A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Some definitions specify that the particles must be dispersed in a liquid, while others extend ...

science.Weimarn, P. P. von

Deutsche Nationalbibliothek The German National Library (DNB; german: Deutsche Nationalbibliothek) is the central archival library and national bibliographic centre for the Federal Republic of Germany. It is one of the largest libraries in the world. Its task is to colle ...

(accessed 7 June 2022)

Biography

He was born in St. Petersburg in 1879. He served as president of the Urals Metallurgical Institute in

Ekaterinburg Yekaterinburg ( ; rus, Екатеринбург, p=jɪkətʲɪrʲɪnˈburk), alternatively romanized as Ekaterinburg and formerly known as Sverdlovsk ( rus, Свердло́вск, , svʲɪrˈdlofsk, 1924–1991), is a city and the administrat ...

and was also associated with the Vladivostok Polytechnic University (1920–1922). In 1922 he moved to Japan, where he researched at the Imperial Industrial Research Institute in

Osaka is a designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the third most populous city in Japan, following Special wards of Tokyo and Yokohama. With a population of 2. ...

. He then moved to

Shanghai Shanghai (; , , Standard Mandarin pronunciation: ) is one of the four direct-administered municipalities of the People's Republic of China (PRC). The city is located on the southern estuary of the Yangtze River, with the Huangpu River flow ...

, where he worked at the Technical Center. He died in Shanghai on June 2, 1935.Veĭmarn, Petr Petrovich fon, 1879–1935

Library of Congress The Library of Congress (LOC) is the research library that officially serves the United States Congress and is the ''de facto'' national library of the United States. It is the oldest federal cultural institution in the country. The library is ...

(accessed 7 June 2022) In 1906 he stated the von Weymarn law: ''Colloidal dispersions are obtained from very dilute or very concentrated solutions but not from intermediate solutions.'' The relative

supersaturation In physical chemistry, supersaturation occurs with a solution when the concentration of a solute exceeds the concentration specified by the value of solubility at equilibrium. Most commonly the term is applied to a solution of a solid in a liqu ...

ratio herein is defined by S=(Q-L)/L (where Q is the amount of the dissolved material and L is its solubility).

Bibliography

*von Weimarn, P P: "Der kolloide Zustand als allgemeine Eigenschaft der Materie (I-III)", Russ. Phys. Chem. Gesellschaft, 1906 *von Weimarn, P P: "Grundzüge der Dispersoidchemie", Dresden 191
Digital edition
by the

University and State Library Düsseldorf The University and State Library Düsseldorf (german: Universitäts- und Landesbibliothek Düsseldorf, abbreviated ULB Düsseldorf) is a central service institution of Heinrich Heine University. Along with Bonn and Münster, it is also one of th ...

*von Weimarn, P P: "Die Allgemeinheit des Kolloidzustandes", Dresden 1925

References

{{DEFAULTSORT:Weymarn, Peter P. von 1879 births 1935 deaths Chemists from the Russian Empire Soviet expatriates in Japan Soviet emigrants to China Scientists from Saint Petersburg Saint Petersburg Mining University alumni