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. 2017 Oct 9;3:17034. doi: 10.1038/micronano.2017.34

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Schematic setup of compression test on microneedles performed by rheometer. (b) Force (N) versus displacement (mm) curves of compression tests with speeds of 35, 45, and 55 μm s⁻¹, on three separate microneedles connected to a reservoir. (c) Force (N) versus displacement (mm) graph of a compression test on an array of 16 microneedles by applying 35 μm s⁻¹ speed. (d) SEM image of the microneedle array with tip heights of 150 μm after compression test.