Table 1 Comparison of different microfluidic valves.
From: Skin-interfaced colorimetric microfluidic devices for on-demand sweat analysis
Valve | Capillary bursting valve | Tesla valve | Hydrophobic valve | Polymer valve |
|---|---|---|---|---|
Mechanism | Bursting pressure | Diodicity | Surface wettability | Wettable materials |
Elements | Microchannel geometry and surface wettability | Difference in flow distribution | Blocking the advancing front of the liquid | Expansion/contraction/dissolution of polymer |
Types of wearables | Polymer | Polymer | Polymer/ paper/fabric | Polymer/paper |
Limitations | High precision requirement, long preparation time | Instability of surface modification | Hysteresis, possible sample contamination | |
