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Article Dans Une Revue Soft Matter Année : 2018

Bioinspired microstructures of chitosan hydrogel provide enhanced wear protection

Résumé

We describe the fabrication of physical chitosan hydrogels exhibiting a layered structure. This bilayered structure, as shown by SEM and confocal microscopy, is composed of a thin dense superficial zone (SZ), covering a deeper zone (DZ) containing microchannels orientated perpendicularly to the SZ. We show that such structure favors diffusion of macromolecules within the hydrogel matrix up to a critical pressure, sigma(c), above which channels were constricted. Moreover, we found that the SZ provided a higher wear resistance than the DZ which was severely damaged at a pressure equal to the elastic modulus of the gel. The coefficient of friction (CoF) of the SZ remained independent of the applied load with mu(SZ) = 0.38 +/- 0.02, while CoF measured at DZ exhibited two regimes: an initial CoF close to the value found on the SZ, and a CoF that decreased to mu(DZ) = 0.18 +/- 0.01 at pressures higher than the critical pressure sigma(c). Overall, our results show that internal structuring is a promising avenue in controlling and improving the wear resistance of soft materials such as hydrogels.

Dates et versions

hal-02010412 , version 1 (07-02-2019)

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Citer

Jimmy Faivre, Guillaume Sudre, Alexandra Montembault, Stéphane Benayoun, Xavier Banquy, et al.. Bioinspired microstructures of chitosan hydrogel provide enhanced wear protection. Soft Matter, 2018, 14 (11), pp.2068-2076. ⟨10.1039/c8sm00215k⟩. ⟨hal-02010412⟩
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