Membrane Diffusion & Osmosis
Fick's Law — Particle diffusion across semipermeable membrane
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Left concentration:
80
Right concentration:
20
Diffusion coeff D:
1.0
Channels (pores):
5
Temperature T:
1.0
Membrane size:
medium
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Add Particles Left
Equilibrate
J = −D·∇C (Fick's first law)
Particles cross membrane only at channel positions.
Osmotic pressure:
net flow down gradient.
Goldman equation: V_m = (RT/F)·ln(Σ Pk·[X]out / Σ Pk·[X]in)