High-water-content mouldable hydrogels by mixing clay and a dendritic molecular binder

Qigang Wang, Justin L. Mynar, Masaru Yoshida, Eunji Lee, Myongsoo Lee, Kou Okuro, Kazushi Kinbara, Takuzo Aida

Research output: Contribution to journalArticlepeer-review

1165 Citations (Scopus)

Abstract

With the worlds focus on reducing our dependency on fossil-fuel energy, the scientific community can investigate new plastic materials that are much less dependent on petroleum than are conventional plastics. Given increasing environmental issues, the idea of replacing plastics with water-based gels, so-called hydrogels, seems reasonable. Here we report that water and clay (2-3 per cent by mass), when mixed with a very small proportion (0.4 per cent by mass) of organic components, quickly form a transparent hydrogel. This material can be moulded into shape-persistent, free-standing objects owing to its exceptionally great mechanical strength, and rapidly and completely self-heals when damaged. Furthermore, it preserves biologically active proteins for catalysis. So far no other hydrogels, including conventional ones formed by mixing polymeric cations and anions or polysaccharides and borax, have been reported to possess all these features. Notably, this material is formed only by non-covalent forces resulting from the specific design of a telechelic dendritic macromolecule with multiple adhesive termini for binding to clay.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
JournalNature
Volume463
Issue number7279
DOIs
Publication statusPublished - 2010 Jan 21

ASJC Scopus subject areas

  • General

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