Nano crystalline core typically refers to materials that have a crystalline structure on the nanoscale, often within the range of 1 to 100 nanometers. These materials can exhibit unique physical and chemical properties due to their small size and high surface area-to-volume ratio. They are commonly found in various applications across different fields, including:

1. 1、Magnetic Materials: Nano crystalline cores are used in magnetic materials for applications like transformers, inductors, and magnetic sensors. Their fine grain structure can enhance magnetic performance.

2. 2、Catalysis: In catalysis, nano crystalline materials can provide improved surface activity. They are often used in catalysts for chemical reactions due to their high reactivity and selectivity.

3. 3、Electronics: In semiconductor and electronic devices, nano crystalline materials can enhance electrical properties, such as improving conductivity or enabling new functionalities in devices like transistors and diodes.

4. 4、Energy Storage: Nano crystalline materials are being explored for use in batteries and supercapacitors, where they can improve charge storage capacity and cycle stability.

5. 5、Biomedical Applications: In the biomedical field, nano crystalline materials can be used for drug delivery, imaging, and as agents in therapies due to their biocompatibility and ability to enhance cellular uptake.

The synthesis of nano crystalline materials can be achieved through various methods, such as chemical vapor deposition, sol-gel processes, ball milling, and hydrothermal synthesis, among others. Their properties can be tailored by controlling the size, shape, and distribution of the nanoparticles.