| Literature DB >> 26645284 |
Qiaochu Li1, Devin G Barrett2, Phillip B Messersmith3, Niels Holten-Andersen1.
Abstract
Interactions between polymer molecules and inorganic nanoparticles can play a dominant role in nanocomposite material mechanics, yet control of such interfacial interaction dynamics remains a significant challenge particularly in water. This study presents insights on how to engineer hydrogel material mechanics via nanoparticle interface-controlled cross-link dynamics. Inspired by the adhesive chemistry in mussel threads, we have incorporated iron oxide nanoparticles (Fe3O4 NPs) into a catechol-modified polymer network to obtain hydrogels cross-linked via reversible metal-coordination bonds at Fe3O4 NP surfaces. Unique material mechanics result from the supra-molecular cross-link structure dynamics in the gels; in contrast to the previously reported fluid-like dynamics of transient catechol-Fe(3+) cross-links, the catechol-Fe3O4 NP structures provide solid-like yet reversible hydrogel mechanics. The structurally controlled hierarchical mechanics presented here suggest how to develop hydrogels with remote-controlled self-healing dynamics.Entities:
Keywords: bio-inspired metal-coordinate polymers; nanocomposite hydrogels; organic−inorganic interface; polymer physics; rheology; supra-molecular assembly
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Year: 2016 PMID： 26645284 PMCID： PMC5660864 DOI： 10.1021/acsnano.5b06692
Source DB: PubMed Journal: ACS Nano ISSN： 1936-0851 Impact factor: 15.881