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. 2018 Jan 26;5:3. doi: 10.1186/s40580-018-0134-5

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Acid-disassembly of Au NCs observed by OCT and DvOCT. Images of acid-disassembling Au NCs in droplets (3 μL) obtained using SD-OCT (a, b) and DvOCT (c, d) after incubation in DI water or pH 5.0 acetate buffer at 37°C for 2 h. Fast and slow moving particles (c, d) were color-coded with red and green, respectively, and further quantitatively analyzed (e)