Simple production of cellulose nanofibril microcapsules and the rheology of their suspensions

Microcapsules are commonly used in applications ranging from therapeutics to personal care products due their ability deliver encapsulated species through porous shells. Here, we demonstrate a simple and scalable approach fabricate microcapsules with shells by interfacial complexation of cellulose nanofibrils oleylamine, investigate the rheological properties suspensions resulting microcapsules. The neat capsules viscous liquids whose viscosity increases volume fraction according modified Kreiger-Dougherty relation maximum packing 0.73 an intrinsic 4. When polyacrylic acid (PAA) is added internal phase microcapsule, however, become elastic display yield stresses power-law dependencies on capsule PAA concentration. elasticity appears originate associative interactions between induced that resides within microcapsule These results it possible tune changing only composition phase, thereby providing novel method tailor complex fluid rheology.