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UE6 - Physique

Transferts membranaires

XFormule
Concentration pondérale Cp=m/V
Concentration molaire Cm=n/V
Molalité Cm=n/m[solvant]
Fraction molaire F=n1/n[tot]
Titre τ=m[soluté]/m[tot]
Concentration équivalente Ceq=z.Cm
1ère loi de Fick dm/dt=-D.S.dC/dx
Flux de matière J=dm/(dt.S)=-D.dC/dx.β
Coefficient de diffusion D=Δl²/(2.Δt)
Diffusion à travers la membrane J=P.dm
Perméabilité diffusible P=D.α/h
Loi de Raoult (abaissement point de congélation) ΔTf=-1,86C/M
Pression osmotique π=(n[solvant]/V).RT=Cosm.RT=x.22,4
Osmolarité [1+(β-1)α].Molarité
Travail osmotique W=RT.log(π2/π1)=RT.log(C2/C1)
Equilibre de Donan [Na+]1.[Cl-]1=[NA+]2.[Cl-]2
Relation de Nernst ddp=ψA-ψB=RT/zF.ln(CB/CA)
Formule d'Einstein D=kT/6ηπR
Membrane semi-perméable (définition) Laisse uniquement passer le solvant
Membrane biologique Laisse passer solvant et petites mol mais pas ions
Iso-osmotique Sur membrane strictement perméable : 2 solution ayant pression osmotique opposée au solvant pur égale
Isotonique Sur membrane biologique : même pression osmotique opposées au solvant pur
Created by: Flavien
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