Nanoparticle Self-Assembly of Hierarchically Ordered Microcapsule Structures


  • We gratefully acknowledge the financial support of Halliburton Energy Services, the Oak Ridge Associated Universities Ralph E. Powe Junior Faculty Enhancement Award, Kraft Foods, and Rice University. Supporting Information is available online from Wiley InterScience or from the author.


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Microcapsules with multilayer-thick shells are synthesized by depositing negatively charged nanoparticles around cationic polyamine aggregates crosslinked by multivalent counteranions (see Figure and inside cover). Unique among hollow-sphere preparative routes, this rapid and green synthesis leads to a robust organic/inorganic hybrid structure, applies to a wide spectrum of colloidal species, and permits the non-destructive encapsulation of water-soluble compounds.