Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios.

Abstract:

:Nacre-mimetics hold great promise as mechanical high-performance and functional materials. Here we demonstrate large progress of mechanical and functional properties of self-assembled polymer/nanoclay nacre-mimetics by using synthetic nanoclays with aspect ratios covering three orders in magnitude (25-3,500). We establish comprehensive relationships among structure formation, nanostructuration, deformation mechanisms and mechanical properties as a function of nanoclay aspect ratio, and by tuning the viscoelastic properties of the soft phase via hydration. Highly ordered, large-scale nacre-mimetics are obtained even for low aspect ratio nanoplatelets and show pronounced inelastic deformation with very high toughness, while those formed by ultralarge nanoplatelets exhibit superb stiffness and strength, previously only reachable for highly crosslinked materials. Regarding functionalities, we report formerly impossible glass-like transparency, and excellent gas barrier considerably exceeding earlier nacre-mimetics based on natural nanoclay. Our study enables rational design of future high-performance nacre-mimetic materials and opens avenues for ecofriendly, transparent, self-standing and strong advanced barrier materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Das P,Malho JM,Rahimi K,Schacher FH,Wang B,Demco DE,Walther A

doi

10.1038/ncomms6967

subject

Has Abstract

pub_date

2015-01-20 00:00:00

pages

5967

issn

2041-1723

pii

ncomms6967

journal_volume

6

pub_type

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