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. Author manuscript; available in PMC: 2018 Oct 11.
Published in final edited form as: Lab Chip. 2017 Oct 11;17(20):3474–3488. doi: 10.1039/c7lc00694b

Figure 3.

Figure 3

(A) Initial CAD design for a flat spiral structure. (B) Schematic showing 3D printing of spiral structure. (C) Representative brightfield image of a printed spiral. (D) Corresponding feature detection with overcure (red) and undercure (green). (E) Pattern fidelities for various precursor solutions with varying ion composition and concentration (n = 6 per condition). Error bars represent standard deviation. (F) Experimental setup for the modified “windowpane” test used to calculate the working curve. (G) The working curve for 3% alginate with 1:3 Ba2+: Mg2+ used to empirically determine the critical exposure (EC) and the penetration depth (DP). Trendline R2 = 0.9984. Error bars represent standard deviation.