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The hydrodynamic radius of a macromolecule or colloid particle has two meanings. Some books use it as a synonym for the Stokes radius. 〔 Section 6.4 page 290. 〕 Other books define a theoretical hydrodynamic radius . They consider the macromolecule or colloid particle to be a collection of subparticles. This is done most commonly for polymers; the subparticles would then be the units of the polymer. is defined by : is the distance between subparticles and , and where the angular brackets represent an ensemble average. 〔 Chapter 10, Section 7.4, pages 415-417. 〕 The theoretical hydrodynamic radius was originally an estimate by John Gamble Kirkwood of the Stokes radius of a polymer. The theoretical hydrodynamic radius arises in the study of the dynamic properties of polymers moving in a solvent. It is often similar in magnitude to the radius of gyration. ==Notes== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hydrodynamic radius」の詳細全文を読む スポンサード リンク
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