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• W3048857359 endingPage "1178" @default.
• W3048857359 startingPage "1158" @default.
• W3048857359 abstract "The effect of inserting a neutral water-soluble adsorbing polymer on the flexibility of amphiphilic bilayers in a lamellar phase is investigated. The Lα system is a stack of charged undulating bilayers composed of sodium dodecyl sulfate (SDS) and octanol separated by aqueous solutions of polyethylene glycol (PEG). The mean bending elastic modulus κ is determined from the quadrupole splittings in the solid state NMR spectra of the perdeuterated octanol chains embedded in the membranes that undergo collective fluctuations. Parameters for describing the membrane behavior (bilayer thickness, elastic compressibility modulus, order parameter) are obtained by supplementing the NMR data with complementary experiments (x-ray scattering), NMR spectral simulations, and theoretical considerations. A fairly complete picture of the membrane rigidity emerges for any location in the lamellar phase thanks to a broad sweep of the lamellar domain by systematically varying the membrane fraction along dilution lines as well as the polymer composition. The most remarkable result is the difference between dilute and semi-dilute regimes. In the dilute PEG solution, no (or slight positive shift) polymer contribution to the rigidity curvature of the layered system is noted within the experimental resolution (≤0.3 kBT) and κ remains around 2.7 kBT. In contrast, the membrane rigidity increases steadily upon polymer addition once the crossover concentration cp* is exceeded, amounting to a 60% increase in κ at polymer concentration 2.5 cp* in the aqueous interlayers. These results are discussed with regard to the theoretical expectation of membrane rigidification upon irreversible polymer adsorption." @default.
• W3048857359 created "2020-08-18" @default.
• W3048857359 creator A5038103455 @default.
• W3048857359 creator A5038514424 @default.
• W3048857359 date "2021-01-01" @default.
• W3048857359 modified "2023-10-05" @default.
• W3048857359 title "Bending elastic modulus of a polymer-doped lyotropic lamellar phase" @default.
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