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. 2018 Mar 26;4:2. doi: 10.1038/s41378-018-0002-9

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a The capillary flow of a sample liquid in a constant cross-section capillary depends on the sample liquid properties; b adding a second liquid, the pump liquid generates a flow dependency on both the sample liquid and the pump liquid; c creating a flow restrictor and decreasing the capillary cross-section in the pump liquid region generates a flow dependency solely on the pump liquid; d sketch of the capillary pump using three concatenated glass capillary tubes and precision cut nitrocellulose paper; and e photograph of a capillary pump.