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. Author manuscript; available in PMC: 2015 Aug 6.
Published in final edited form as: Adv Funct Mater. 2014 Apr 22;24(29):4584–4594. doi: 10.1002/adfm.201400653

Figure 1.

Figure 1

Magnetic nanoconstructs and USPIOs distribution. a, Ultra small superparamagnetic iron oxide nanoparticles (USPIOs) are loaded within the porous structure of 1,000×400 nm discoidal silicon particles (SiMPs); 1,000×500 nm discoidal PLGA/PEG nanoconstructs (DPNs). Mesoscopic clusters of USPIOs are formed within the porous structure leading to multiscale, hierarchically structured magnetic nanoconstructs. Energy Dispersive X-Ray (EDX) – TEM mapping b for the SiMPs; c for the DPNs. These maps show the distribution of the most abundant element (i.e. silicon – Si –for the SiMPs and carbon – C –for the DPNs) and the dispersion of 5 nm USPIOs with the corresponding porous matrix (red dots in the third column). Note the formation of multiple, mesoscopic clusters of USPIOs within the two different matrices, one mesoporous silicon and one polymeric. (scale bar: 100 nm)