Entangled glycerol hydrogels for wave modulation of Rayleigh-SAW devices

(400% higher than that of PDMS). We also demonstrate two SAW-based microfluidic applications of the highly entangled glycerol hydrogel absorber. Compared with PDMS, the glycerol hydrogel absorber increases the streaming velocity by 36.8% in droplet stirring and the collection rate by 56.9% in particle enrichment. The highly entangled glycerol hydrogel absorber offers a space-efficient route toward further miniaturization and integration of SAW devices.