Spontaneous Structuration of Biohydrogels by Membrane‐Free Osmosis - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Advanced Functional Materials Année : 2024

Spontaneous Structuration of Biohydrogels by Membrane‐Free Osmosis

Résumé

Many bio‐hydrogels are prepared thanks to the addition of divalent ions. These gels usually exhibit partial ionic selectivity, a feature is leveraged to instigate an osmotic flow during the gelation process across a range of bio‐hydrogels. A simple experimental setup consisting a glass capillary filled by the reactant solution is taken as an advantage, brought into contact with a reservoir of calcium chloride. Direct observation allows to characterize the gelation kinetics, the permeability and the selectivity of several gels, including some made of protein aggregates, pectin, and alginate. It is shown that these intrinsic properties, coupled with appropriate gelation kinetics, intricately govern the osmotic flow induced by the chemical potential difference of the calcium chloride ions imposed during gel formation, consistent with the Kedem–Kashalsky equation. The forming gel acts as a semi‐permeable membrane for calcium chloride ions. The consequences of this osmotic flow are of potentially great interest since it triggers an increase of the gel concentration close to its boundary, opening the road to their spontaneous structuration. The formation of this dense shell is well accounted for the combination of a mass balance and a kinetic model.
Fichier principal
Vignette du fichier
Adv Funct Materials - 2024 - Guilbert - Spontaneous Structuration of Biohydrogels by Membrane%E2%80%90Free Osmosis.pdf (2.5 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04586275 , version 1 (24-05-2024)

Licence

Identifiants

Citer

Emilie Guilbert, Clément de Loubens, Alice Vilotte, Christophe Schmitt, Deniz Gunes, et al.. Spontaneous Structuration of Biohydrogels by Membrane‐Free Osmosis. Advanced Functional Materials, 2024, pp.2400888. ⟨10.1002/adfm.202400888⟩. ⟨hal-04586275⟩

Collections

UGA CNRS LRP ANR
8 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More