Skip to main content
. Author manuscript; available in PMC: 2010 Feb 25.
Published in final edited form as: Adv Funct Mater. 2009 Sep 23;19(18):2943–2949. doi: 10.1002/adfm.200900763

Figure 5.

Figure 5

SEM images of PLGA microbeads with hollow interiors and porous walls prepared by the A,B) W-O-W method and C,D) W-W/O-W method, respectively. The outer surfaces of the microbeads are shown in (A) and (C), while the cross sections and the inner surfaces are shown in (B) and (D). The flow rates of the inner water, middle oil, and outer water phase were 0.03, 0.3, 2 mL min-1, respectively, for the W-O-W method, and 0.035, 0.3, and 2.5 mL min-1, respectively, for the W-W/O-W method. The insets in (A) and (C) are high magnifications of the outer surfaces of the microbeads, where the scale bars are 5 μm.