Donnan can refer to:
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Donnan (surname)
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Donnan, Iowa, a community in the United States
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Donnán of Eigg, Gaelic priest of the 7th century
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Donnan equilibrium
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Donnan potential
Donnan potential is the difference in the Galvani potentials which appears as a result of Donnan equilibrium, named after Frederick G. Donnan, which refers to the distribution of ion species between two ionic solutions separated by a semipermeab ...
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