The UV curable resin was formulated from vinyl-PDMS of 1,000 cSt, with a vinyl/thiol ratio of 1/2, with DMPA as photoinitiator (0.1 equivalent with respect to thiols). The resin was cast into a Teflon mould and irradiated with UV light (94 mW/cm 2 ) for 2 min. The cured thiol-ene PDMS strips were cut into a size of 7 x 6 x 2 mm. Preparation of Sylgard 184 silicone samples. The base and curing agents were fully mixed at the weight ratio of 10:1, according to the manufacturer's instructions. Bubbles in the mixture were removed by vacuum. The silicone mixture was then poured into the Teflon mould, followed by curing reaction at 60 o C for 3 h. Once cured, the Sylgard strips were cut into 7x 6 x 2 mm. In some samples, the cured Sylgard samples were coated with a mixture consisting of poly[(mercaptopropyl)methylsiloxane] (PDMS-thiol 100), photoinitiator (Irgacure 651), and DCM. This solution was drop-cast onto the silicone surface whilst UV irradiation was applied through a quartz slide for 2 min. The treated surface was then washed with copious amounts of ethanol to remove any unreacted residue, followed by drying in nitrogen flow.