Abstract
AbstractThe underlying theory of passive microrheology is introduced as an in-depth examination of the Generalized Stokes-Einstein Relation (GSER) from the starting point of the Langevin equation. The chapter includes a careful treatment of the assumptions that must be made for the technique to work, and what happens when these assumptions are violated. Methods of interpreting passive microrheology experiments and the general limits of operation are highlighted. The Generalized Stokes-Einstein Relation (GSER) is the principal defining equation of passive microrheology. It is a physical relation between the thermal motion of probe particles and the material rheology. Specifically, it relates the observable displacement of the probe particles to the surrounding material’s rheological response.
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