Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 307, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202200247
Keywords
buckling instabilities; modulated optical responses; soft surface wrinkles; spin-coating; triboelectric charge generation; water collection
Funding
- Council of Scientific & Industrial Research (CSIR) [09/1120(0002)/2019-EMR-I]
- Centre for Research, CHRIST [MNGDSC-1806]
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This article presents a simple, inexpensive and scalable strategy for creating soft surface wrinkles on PDMS using buckling instability. The method is expected to have broad applicability and exhibits high efficiency in water collection and triboelectric charge generation.
Functionality and stimuli-response of natural and artificial elastomeric materials depend significantly on the morphology of their surfaces. Structural transformability and tunable responsiveness of wrinkles on elastomeric materials can enable numerous applications in flexible electronics, optics, and adhesives. Currently existing fabrication techniques rely on sophisticated instrumentation, complex experimental setups, and expensive reagents. These methods are limited in terms of mechanical robustness of the wrinkles produced. Here, a simple, inexpensive, scalable, and reproducible strategy, making use of buckling instability for the creation of soft surface wrinkles on polydimethylsiloxane (PDMS), is presented. PDMS with lower elastic modulus is spin-coated onto a mechanically stretched film of PDMS with a higher elastic modulus. Thermal curing followed by the release of prestrain resulted in the formation of wrinkles in the top layer of the PDMS. The hydrophobic soft surface wrinkles with compositional homogeneity exhibit efficient fog water collection and triboelectric charge generation useful for the preparation of triboelectric nanogenerator devices. Furthermore, the substrates show high mechanical stability and mechanoresponsive optical behaviors. The simplicity and general applicability of the method presented here is expected to establish a promising pathway toward the formation of soft wrinkles in other elastomeric systems also, facilitating important applications in various fields.
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