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. Author manuscript; available in PMC: 2018 Sep 10.
Published in final edited form as: Acc Chem Res. 2017 Feb 7;50(2):170–178. doi: 10.1021/acs.accounts.6b00533

Figure 2.

Figure 2.

SEM images of a 2D array of polystyrene nanoparticles with mannose-hydrogel-filled interstices showing (a) a close-packed array when the hydrogel is collapsed and (b) a non-close-packed array when the hydrogel is swollen. (c) Dependence of the normalized diffraction spectra of 2D mannose hydrogel sensors on the concanavalin A concentration. The inset photographs demonstrate the sensor’s color change with increasing concanavalin A concentration. Reprinted from ref 20. Copyright 2014 American Chemical Society.