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The cover image is a graphical design based on a SEM image of stable aggregated particles via heteroaggregation. The core cationic particle is surrounded by anionic particles in a shell layer and the driving force is mainly electrostatic interaction. This stable aggregated particle is negatively charged due to the sulfonated copolymer present in the anionic particles in the shell layer. As presented by Su Jeong Han, Eric S. Daniels, E. David Sudol, Victoria L. Dimonie, and Andrew Klein on page 3601, each particle is prepared by conventional emulsion polymerization and heteroaggregation is carried out by mixing cationic and anionic latex.