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. 2016 Apr 22;6:24870. doi: 10.1038/srep24870

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(a) Cross-section and top view in the inset of ZNRs grown with PEI in 15 mins, (b) Cross-section and top view in the inset, of ZNRs grown with PEI in 25 mins, (c) PEI circumambulated around the ZNR, and (d) Color of the solution, which confirms the Mannich reaction between zinc salts and PEI.