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. 2016 Nov 7;6:36473. doi: 10.1038/srep36473

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(a) Surface of as-spun WS, (b) cross-section of as-spun WS, (c) surface of as-spun WS-PSD, (d) cross-section of WS-PSD, and surfaces of (e) WS-1x, (f) WS-1x-h, (g) WS-3x, and (h) WS-PSD-3x.