Wet and dry highly porous cellulose beads from cellulose-NaOH-water solutions: influence of the preparation conditions on beads shape and encapsulation of inorganic particles

Romain Sescousse 1 Roxane Gavillon 1 Tatiana Budtova 1
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : Wet (swollen-in-water) and dry highly porous cellulose beads were prepared from cellulose-8%NaOH-water solutions by making droplets and coagulating cellulose in water bath. The shape of the beads varied from very flat plates to spheres. The influence of the preparation conditions (cellulose concentration, delay time, bath temperature, and the distance between the pipette and the bath surface) on the shape of the beads is discussed. Higher is the solution viscosity and weaker is the shock of the falling droplet on the bath surface, more spherical are the beads. Gelation of cellulose-NaOH solutions is shown to be a very important factor controlling bead shape. A simple way of encapsulation of various powders in cellulose beads is demonstrated and wet cellulose-inorganic composites were prepared. Highly porous (Aerocellulose) beads carrying encapsulated particles were made by drying coagulated cellulose under CO2 in supercritical conditions.
Keywords : water solutions cellulose encapsulation
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00522043
Contributeur : Magalie Prudon <>
Soumis le : mercredi 29 septembre 2010 - 14:38:53
Dernière modification le : lundi 17 février 2020 - 17:40:21

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Romain Sescousse, Roxane Gavillon, Tatiana Budtova. Wet and dry highly porous cellulose beads from cellulose-NaOH-water solutions: influence of the preparation conditions on beads shape and encapsulation of inorganic particles. Journal of Materials Science, Springer Verlag, 2011, 46 (3), pp.759-765. ⟨10.1007/s10853-010-4809-5⟩. ⟨hal-00522043⟩

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