Abstract
We realised spring/spacer elements, which are crucial components of capacitive energy harvesters, by syringe printing of polyurethane diacrylate and ethylhexyl acrylate based high (HIPE) and medium (MIPE) internal phase emulsion templates followed by UV polymerisation. The resulting micropatterned poly(merised)H/MIPEs are very flexible and reversibly compressible to a strain of 50% as cyclic compression test revealed. Dynamic mechanical analysis has shown constant mechanical behaviour of the macroporous polymer springs under a loading/unloading at a frequent of 2 Hz for 10 h, proving the practical durability of the springs. Within a prototype harvester the micropatterned macroporous springs allowed to compartmentalise Hg droplets and provided the required restoring force to operate the device successfully; the capacitive change of the device within one compression-recovery cycle reached 570 pF.
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