From Biomacromolecules:
Self-Healing Mussel-Inspired Multi-pH-Responsive Hydrogels
http://pubs.acs.org/doi/full/10.1021/bm301844u#
Another "bio-inspired" gel based on reversible catechol-iron binding.
Interestingly, they show that the best mechanical strength is obtained
at pH ~9, which is apparently when the number of trifunctional
crosslinks is maximized.
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