Flashcards in Chapter 6 - Dynamics of single chains Deck (7)
How is the Einstein relation defined?
D = kT/ç,
ç = friction coefficient.
How is the Stokes-Einstein relation defined?
D = kT/(6π*eta*R)
What is Stokes law?
Stokes law says that the friction coefficient of a sphere moving in a Newtonian liquid is
ç = 6π*eta*R
What is the Rouse model?
In the Rouse model, each polymer has N beads connected by springs of root-mean-square size b, each bead having a friction coefficient ç. The total friction coefficient is
ç_R = Nç,
and the diffusion coefficient is
D_r = kT/Nç.
What is the Rouse time?
The time it takes for a polymer to travel over a distance of the order of its size R.
tau_R = ç/kT * NR^2.
What modes are active for time scales shorter than the Rouse time in the Rouse model?