Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 7, Pages 9899-9908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c24439
Keywords
3D elastomer scaffold; brushed hydrogels; cartilage-like composite; load-bearing; lubrication
Funding
- National Natural Science Foundation of China [22032006, 52075522]
- Key Research Program of the Chinese Academy of Sciences [XDPB24]
- Outstanding Youth Fund of Gansu Province [21JR7RA095]
- Key Research Project of Shandong Provincial Natural Science Foundation [ZR2021ZD27]
- Youth Innovation Promotion Association [2019411]
- International Research Cooperation Seed Fund of Beijing University of Technology [2021A10]
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A new cartilage-like composite material (Composite-LP) was developed by grafting a thick hydrophilic polyelectrolyte brush layer onto a three-dimensional elastomer scaffold-hydrogel composite structure, exhibiting good mechanical properties and surface lubrication performance. The design concept of coupling non-dissipative mechanism and interface lubrication provides a new avenue for developing cartilage-like hydrogels and soft robots.
Natural articular cartilages show extraordinary tribological performance based on their penetrated surface lubricated biomacromolecules and good mechanical tolerance. Hydrogels are considered to be potential alternatives to cartilages due to their low surface friction and good biocompatibility, although the poor mechanical properties limited their applications. Inspired by the excellent mechanical properties and the remarkable surface lubrication mechanism of natural articular cartilages, one kind of cartilage-like composite material with a lubrication phase (Composite-LP) was developed by chemically grafting a thick hydrophilic polyelectrolyte brush layer onto the subsurface of a three-dimensional manufactured elastomer scaffold-hydrogel composite architecture. The Composite-LP exhibited good loadbearing capacities because of the nondissipation strategy and the stress dispersion mechanism resulting from the elastomer scaffold enhancement. In the presence of the top lubrication layer, the Composite-LP showed superior friction reduction functionality and wear resistance under a dynamic shearing process. This design concept of coupling the non-dissipative mechanism and interface lubrication provides a new avenue for developing cartilage-like hydrogels and soft robots.
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