Self-organization of nanoparticles and molecules in periodic Liesegang-type structures.

Self-organization of nanoparticles and molecules in periodic Liesegang-type structures.
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DOI:
10.1126/sciadv.abe3801
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Kumacheva E
Kumacheva E
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ackroyd AJ;Holló G;Mundoor H;Zhang H;Gang O;Smalyukh II;Lagzi I;Kumacheva E

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Solvent evaporation from a suspension of cellulose nanocrystals and l-(+)-tartaric acid leads to periodic ring-type patterns. Chemical organization in reaction-diffusion systems offers a strategy for the generation of materials with ordered morphologies and structural hierarchy. Periodic structures are formed by either molecules or nanoparticles. On the premise of new directing factors and materials, an emerging frontier is the design of systems in which the precipitation partners are nanoparticles and molecules. We show that solvent evaporation from a suspension of cellulose nanocrystals (CNCs) and l-(+)-tartaric acid [l-(+)-TA] causes phase separation and precipitation, which, being coupled with a reaction/diffusion, results in rhythmic alternation of CNC-rich and l-(+)-TA–rich rings. The CNC-rich regions have a cholesteric structure, while the l-(+)-TA–rich bands are formed by radially aligned elongated bundles. The moving edge of the pattern propagates with a finite constant velocity, which enables control of periodicity by varying film preparation conditions. This work expands knowledge about self-organizing reaction-diffusion systems and offers a strategy for the design of self-organizing materials.
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