Pickering Emulsions via Interfacial Nanoparticle Complexation of Oppositely Charged Nanopolysaccharides

• DOI: 10.1021/acsami.0c22560
• Publication Date: 2021-03-03T20:42:59Z
• Authors: Siqi Huan; Ya Zhu; Wenyang Xu; David Julian McCl...; Long Bai; Orlando J. Rojas
• Keywords: Pickering emulsion; Surface charge; Creaming; Particle (ecology)

We consider the variables relevant to adsorption of renewable nanoparticles and stabilization multiphase systems, including particle's hydrophilicity, electrostatic charge, axial aspect, entanglement. Exploiting complexation two oppositely charged nanopolysaccharides, cellulose nanofibrils (CNFs) nanochitin (NCh), we prepared CNF/NCh aqueous suspensions identified conditions for charge balance (turbidity electrophoretic mobility titration). By adjusting composition complexes, below above net neutrality conditions, produced sunflower oil-in-water Pickering emulsions with adjustable droplet diameters stability against creaming oiling-off. The complexes at oil/water interface occurred simultaneous partitioning (accumulation) CNF on surface droplets in negative or positive systems (below stochiometric relative NCh). further show that morphology size distribution were preserved during storage least 6 months under ambient conditions. This long-term was held a remarkable tolerance changes pH (e.g., 3–11) ionic strength 100–500 mM). mechanism explaining these observations relates counteracting losses resulting from deprotonation NCh screening. Overall, respective interfacial nanoparticle exchange greatly extend favoring highly stable, green offer potential applications foodstuff, pharmaceutical, cosmetic formulations.