The influence of polydimethylsiloxane curing ratio on capillary pressure in microfluidic devices

► PDMS surface properties as effect of different degree of cross-linking. ► Tailoring PDMS wettability and surface properties to modulate the dynamics of PDMS microdevices. ► Negative capillary pressure induced by a modulation of surface properties. ► Confinement of liquids inside PDMS microchannels.