Particle-stabilized foams using sustainable materials

A method of preparing a porous article comprising:

• providing a suspension comprising an aqueous liquid, preferably water, particles, a hardening agent and at least one surfactant, wherein the at least one surfactant at least partially hydrophobizes a surface of the particles;
• and
• foaming the suspension comprising the particles having the at least partially hydrophobized surface,
• wherein the at least one surfactant is selected from surfactants having a backbone chain comprising at least nine carbon atoms, the at least one surfactant being an amphiphilic molecule consisting of a tail coupled to a head group, wherein the tail comprises the backbone chain comprising at least nine carbon atoms, and obtaining a foam;
• casting or extruding or additive manufacturing, in particular 3D-printing, the foam, and
• optionally setting, and/or
• optionally drying, and
• hardening the foam in the presence of a hardening agent, wherein the foam is not sintered.