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

Abstract:

:With the world's 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.

journal_name

Nature

journal_title

Nature

authors

Wang Q,Mynar JL,Yoshida M,Lee E,Lee M,Okuro K,Kinbara K,Aida T

doi

10.1038/nature08693

subject

Has Abstract

pub_date

2010-01-21 00:00:00

pages

339-43

issue

7279

eissn

0028-0836

issn

1476-4687

pii

nature08693

journal_volume

463

pub_type

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