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@article{Ma:2015:10.1002/adfm.201503681,
author = {Ma, S and Scaraggi, M and Wang, D and Wang, X and Liang, Y and Liu, W and Dini, D and Zhou, F},
doi = {10.1002/adfm.201503681},
journal = {Advanced Functional Materials},
pages = {7366--7374},
title = {Nanoporous Substrate-Infiltrated Hydrogels: a Bioinspired Regenerable Surface for High Load Bearing and Tunable Friction},
url = {http://dx.doi.org/10.1002/adfm.201503681},
volume = {25},
year = {2015}
}
TY - JOUR
AB - Nature has successfully combined soft matter and hydration lubrication to achieve ultralow friction even at relatively high contact pressure (e.g., articular cartilage). Inspired by this, hydrogels are used to mimic natural aqueous lubricating systems. However, hydrogels usually cannot bear high load because of solvation in water environments and are, therefore, not adopted in real applications. Here, a novel composite surface of ordered hydrogel nanofiber arrays confined in anodic aluminum oxide (AAO) nanoporous template based on a soft/hard combination strategy is developed. The synergy between the soft hydrogel fibers, which provide excellent aqueous lubrication, and the hard phase AAO, which gives high load bearing capacity, is shown to be capable of attaining very low coeffcient of friction (<0.01) under heavy load (contact pressures ≈2 MPa). Interestingly, the composite synthetic material is very stable, cannot be peeled off during sliding, and exhibits desirable regenerative (self-healing) properties, which can assure long-term resistance to wear. Moreover, the crosslinked polymethylacrylic acid hydrogels are shown to be able to promptly switch between high friction (>0.3) and superlubrication (≈10−3) when their state is changed from contracted to swollen by means of acidic and basic actuation. The mechanisms governing ultralow and tunable friction are theoretically explained via an in-depth study of the chemomechanical interactions responsible for the behavior of these substrate-infiltrated hydrogels. These findings open a promising route for the design of ultra-slippery and smart surface/interface materials.
AU - Ma,S
AU - Scaraggi,M
AU - Wang,D
AU - Wang,X
AU - Liang,Y
AU - Liu,W
AU - Dini,D
AU - Zhou,F
DO - 10.1002/adfm.201503681
EP - 7374
PY - 2015///
SN - 1616-301X
SP - 7366
TI - Nanoporous Substrate-Infiltrated Hydrogels: a Bioinspired Regenerable Surface for High Load Bearing and Tunable Friction
T2 - Advanced Functional Materials
UR - http://dx.doi.org/10.1002/adfm.201503681
UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201503681
UR - http://hdl.handle.net/10044/1/29361
VL - 25
ER -