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Article Dans Une Revue Physical Review Letters Année : 2008

Direct calculation from the stress tensor of the lateral surface tension of fluctuating fluid membranes

Jean-Baptiste Fournier
Camilla Barbetta
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Résumé

From the tangential and normal stresses associated with the Helfrich Hamiltonian, we calculate the lateral force per unit length, τ, exerted by a planar, fluctuating membrane, as a function of the membrane tension σ and bending rigidity κ. We unveil a confusion in the literature concerning the derivation of τ, and we argue, contrary to the present understanding, that τ should differ from the tensionlike coefficient of the fluctuation spectrum. Nontrivial implications concerning the Laplace pressure in vesicles and its relation with the excess area are discussed.
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hal-00264891 , version 1 (18-03-2008)

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Jean-Baptiste Fournier, Camilla Barbetta. Direct calculation from the stress tensor of the lateral surface tension of fluctuating fluid membranes. Physical Review Letters, 2008, 100 (7), pp.078103. ⟨10.1103/PhysRevLett.100.078103⟩. ⟨hal-00264891⟩
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