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Characterization and storage stability of LPHM@DDI NPs. (A) TEM images of DLMSNs, DDI and LPHM@DDI NPs. (B) EDS-mapping images of LPHM@DDI NPs with Si, O, C and N elements. Size distributions (C) and Zeta potentials (D) of DLMSNs, DDI, LM@DDI, PM@DDI, and LPHM@DDI NPs. Size and PDI changes of DLMSNs, DDI and LPHM@DDI NPs in deionized water (E) and 10% FBS solution (F).
