Scalable Synthesis of Chestnut‐ Bur‐like Magnetic Capsules Loaded with Size‐Controlled Mono‐ or Bimetallic Cores

A scalable synthesis of core/shell capsules by the heat treatment of polyelectrolyte-multilayer-particle reactors, in which metal nanoparticles are embedded (see figure), is demonstrated. Using this method, it is possible to prepare a wide variety of core/shell structures from a variety of materials, and to control the size, dispersity, and core composition of mono- or bimetallic core particles.