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

TL;DR

This study demonstrates how freeze casting can be used to create lightweight, anisotropic sugar beet pectin foams with controlled texture and pore structure, enhancing their capillary and mechanical properties.

Contribution

It introduces a novel application of freeze casting to shape sugar beet pectin into customizable foams, enabling improved performance as liquid transport devices.

Findings

Controlled pore anisotropy improves capillary transport.

Processing conditions influence foam texture and mechanics.

Freeze casting enables upcycling of industrial byproducts.

Abstract

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.