Schematic diagram of the process for generating alginate gel microparticles with single AuNPs layers.
The diffusion of reagents and reaction in alginate gel. (a) diffused in the front surface of the gel. (b) Soon after, L-ascorbic acid diffused in the gel. (c) L-ascorbic acid reacted with . (d) Excessive reagents were removed by DI water.
Process of generating anisotropic alginate gels. (a) PDMS template with solid gels in it. (b) Gel particles with AuNPs layers in the template. (c) Gel particles released from the microwells. The scare bars in (a) and (b) are , and scare bar in (c) is .
SEM images of dried microparticles’ surfaces with AuNPs layers. (a) Image of a single gel put the right way up. (b) The front side of one gel was at the bottom of the picture, and the back side of another gel was at the top side of the picture. The scare bars in the inserted pictures are, respectively, in (a) and in (b).
XPS spectra of front side of the gels.
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