Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202102433
Keywords
dehydration; hydrogels; hydrophobic; skin‐ inspired; water retention capacity
Categories
Funding
- National Natural Science Foundation of China [52003157, 51973118, 21805193]
- Key-Area Research and Development Program of GuangDong Province [2019B010929002, 2019B010941001]
- Program for Guangdong Introducing Innovative and Enterpreneurial Teams [2019ZT08C642]
- Postdoctoral Science Foundation of China [2020M672819]
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This study introduces a new strategy for surface functionalization of hydrogels, which involves a double-hydrophobic coating to enhance water retention capacity, improve stability, and prolong the lifetime of hydrogels in air.
Traditional hydrogels always lose their flexibility and functions in dry environments because the internal water inevitably undergoes evaporation. In this study, a skin-inspired, facile, and versatile strategy for developing encapsulated hydrogels with excellent water retention capacity through a double-hydrophobic coating is proposed. The robust double-layer coating, which integrates a hydrophobic polymer coating with a hydrophobic oil layer simultaneously, can provide a barrier to prevent the evaporation of water. To overcome the weak interfacial strength between the hydrophilic hydrogel surface and the double-hydrophobic coating, (3-aminopropyl) triethoxysilane (APTES) is utilized as a chemical binding agent. Furthermore, the overall mechanical properties of the bulk hydrogel are not significantly affected, because the coating is only anchored to the surface and its thickness is much lower than that of the native hydrogel. Moreover, it is demonstrated that this proposed strategy particularly holds the capability of encapsulating various types and different shapes of hydrogels, leading to enhanced stability and a prolonged lifetime in air. Therefore, the proposed technology provides new insights for multifarious surface functionalization of hydrogel and broadens the range of hydrogel applications.
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