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. Author manuscript; available in PMC: 2018 Feb 8.
Published in final edited form as: Nano Lett. 2017 Jan 30;17(2):821–826. doi: 10.1021/acs.nanolett.6b04071

Figure 4. PDMS beads present high surface stiffness and nanoscale structure.

Figure 4

(A) Comparison of Young’s modulus across PDMS beads of different formulations. Each data point represents the average modulus measured for an individual bead, with five beads measured for each condition. Data bars represent mean ± s.d. across these beads. The modulus of an individual bead was calculated from five independent, 500 nm × 500 nm fields measured on that structure. (B) AFM analysis of a PDMS bead as a function of depth from the surface, sectioned from a large (millimeter-scale) MED-6215 bead. This representative region was within 500 μm of the bead edge. (C) Local rigidity analysis of the bead surface presented in Figure 1D, overlaying modulus (color coded, as indicated by the underlying bar) onto surface topography.