This talk summarizes our efforts on surface active colloids, which display a unique ability to stabilize complex fluids, such as emulsions and foams. The inherently weak interparticle interactions in these system limits their consolidation into robust solid materials, which is a major objective in engineering light-weight architectures. Efforts in this area have included compositing with soluble polymers that introduce cohesion in materials assembled from the foam precursors. Related efforts have targeted structural applications, whereas functions have been neglected. Herein, we take advantage of the high axial aspect ratio and hydration ability of cellulose nanofibrils (CNF), which added at extremely low volume fractions enable highly cohesive particle assemblies at the air-liquid interface, for example in Pickering foams. The supramolecular assemblies formed under strong cohesive interactions, for instance, with hydrophobic particles of low aspect-ratio, represent anew avenue in material chemistry. CNF/particle stabilized foams are demonstrated as versatile precursors for the formation of materials with varied morphologies, ranging from porous foams to dense composite films. The performance of the introduced CNF bioadhesive is further tuned by given surface modification.

Development of foams and lightweight composites based on renewable nanoparticles

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ACS Spring 2023

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