In January 2026, the research on the formation mechanism and preparation process of the core-shell structure of micro-nano particles has received new interpretations. This structure has become a research hotspot in the material field because it can integrate the advantages of core and shell materials and produce synergistic characteristics. Its formation is essentially a process of heterogeneous nucleation and interface-controlled growth, driven by the thermodynamics of reducing interface energy and the kinetic path of heterogeneous nucleation and growth. The surface charge of the core and the material diffusion and reaction rate also affect the structure formation.
    At present, the preparation processes of core-shell structure are mainly divided into three categories. Liquid phase chemical method is the most commonly used method, including sol-gel, hydrothermal/solvothermal and other subdivision methods; physical and vapor phase methods have high preparation accuracy but high equipment cost; template method and self-assembly method are suitable for the preparation of specific structures. Different processes have their own advantages and disadvantages, and should be selected according to material properties, shell requirements and application scenarios. In the field of MLCC barium titanate ceramic powder, hydrothermal method has become the mainstream process, and atomic layer deposition technology represents the future development direction. This structure also shows broad application potential in electronics, new energy and other fields.

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