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. 2017 Sep 11;12:6759–6769. doi: 10.2147/IJN.S142916

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© 2017 Zhang et al. This work is published and licensed by Dove Medical Press Limited

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Structural characterization of HCSs. Properties of HCSs analyzed using (A) Raman spectroscopy and (B) FTIR spectroscopy.

Abbreviation: HCS, hollow carbon sphere.