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(a) Average diameter of synthesized alginate microparticles bounded with nanofilms of different number of bilayers. (b) ζ-Potential measurements for deposition of polyelectrolyte nanofilms on alginate microparticles. (c) Microscopic image of barcode hydrogel sensor. Scale bar = 1 mm. (d) Image of barcode hydrogel (approximately 6.5 mm long and 1.2 mm wide).
