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. 2020 Apr 10;11(4):395. doi: 10.3390/mi11040395

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Brightfield images of silicon micromachined mold (A,B) and PDMS single layer valve under different actuation pressures (C,D). (A) Brightfield image of micromachined silicon stamp for soft lithography. (B) 100x magnification of the corner of our structural element. As it can be observed the side opening measures ~0.5 μm. (C) Brightfield image of our microfluidic valve in the rest state. (D) Brightfield image of our microfluidic valve actuated at a negative pressure of 0.5 atm. (E) Brightfield image of our microfluidic valve actuated with a positive pressure of 1 atm.