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Though invisible to the eye, colloidal particles can be viewed indirectly by reflected light with an ultramicroscope, a device for studying particles too small to be seen with an ordinary microscope. Svedberg built an ultramicroscope and published several papers on the production and motion of colloidal particles before completing his dissertation on colloidal solutions. He believed his observations verified theories of Albert Einstein and Marian Smoluchowski about the chaotic movements of small particles, known as Brownian motion. Svedberg’s theoretical analyses were criticized by Einstein and Smoluchowski as well as by chemist Jean Perrin. Radioactivity was also a new and exciting field at this time. Svedberg decided to determine where new radioactive substances might fit in the periodic table. Working with his colleague Daniel StrÃ¶mholm, he found that corresponding members of the three radioactive series were extremely similar chemically.
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