Controlling ice formation on gradient wettability surface for high-performance bioinspired materials.

Abstract:

:Ice-templating holds promise to become a powerful technique to construct high-performance bioinspired materials. Both ice nucleation and growth during the freezing process are crucial for the final architecture of the ice-templated material. However, effective ways to control these two very important factors are still lacking. Here, we demonstrate that successive ice nucleation and preferential growth can be realized by introducing a wettability gradient on a cold finger. A bulk porous material with a long-range lamellar pattern was obtained using a linear gradient, yielding a high-performance, bulk nacre-mimetic composite with excellent strength and toughness after infiltration. In addition, cross-aligned and circular lamellar structures can be obtained by freeze-casting on surfaces modified with bilayer linear gradient and radial gradient, respectively, which are impossible to realize with conventional freeze-casting techniques. Our study highlights the potential of harnessing the rich designability of surface wettability patterns to build high-performance bulk materials with bioinspired complex architectures.

journal_name

Sci Adv

journal_title

Science advances

authors

Zhao N,Li M,Gong H,Bai H

doi

10.1126/sciadv.abb4712

subject

Has Abstract

pub_date

2020-07-31 00:00:00

pages

eabb4712

issue

31

issn

2375-2548

pii

abb4712

journal_volume

6

pub_type

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