Yolk-like颗粒最近比较受欢迎，不同的课题组都做出了很有意义的工作。

Rattle-type hollow magnetic mesoporous sphere (HMMS) with Fe3O4 particles encapsulated in the cores of mesoporous silica microspheres

http://onlinelibrary.wiley.com/doi/10.1002/adfm.200701317/abstract

 

a–c) TEM images and d) magnetization curves of Fe3O4@SiO2 hollow mesoporous

spheres with varying Fe3O4 content. Scale bars: 100 nm.

 

http://onlinelibrary.wiley.com/doi/10.1002/smll.200901403/abstract

Double-Walled SnO2 Nano-Cocoons with Movable Magnetic Cores

 

http://onlinelibrary.wiley.com/doi/10.1002/adma.200700357/abstract

 

展望，yolk的shell孔径可能还不足以生物酶通过，如何能把生物大分子固定在yolk的空心结构中仍然是个难题！

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