Ice-templating beet-root pectin foams: Controlling texture, mechanics and capillary properties

Sarah Christoph (1) , Ahmed Hamraoui (1) , Estelle Bonnin (2) , Catherine Garnier (2) , Thibaud Coradin (1) , Francisco M Fernandes (1)

1 LCMCP-MATBIO - Matériaux et Biologie
2 BIA - Unité de recherche sur les Biopolymères, Interactions Assemblages

Sugar beet pectin is a byproduct of the sugar industry with a particularly low gelling power which hinders its application as gelling agent and thickener. Here we consider the use of freeze casting to shape sugar beet pectin into lightweight foams. Freeze casting processing conditions such as the applied thermal gradient and the polysaccharide concentration were explored to obtain macroporous lightweight foams with different textures. The precise control over the foams' texture and pore anisotropy was decisive for their performance as liquid transport devices by capillary ascension and for their mechanical performance. Overall, the obtained results show that the formation of highly anisotropic structures using freeze casting can be instrumental in the upcycling of polysaccharide industrial byproducts.

Keywords: Ice templating; Lightweight materials; Polysaccharide foams; Pectin; Capillary transport; Mechanical properties

Domains: Chemical Sciences

Sarah Christoph, Ahmed Hamraoui, Estelle Bonnin, Catherine Garnier, Thibaud Coradin, et al.. Ice-templating beet-root pectin foams: Controlling texture, mechanics and capillary properties. Chemical Engineering Journal, 2018, 350, pp.20-28. ⟨10.1016/j.cej.2018.05.160⟩. ⟨hal-02124304⟩