Communication Dans Un Congrès Année : 2025

Depletion-induced tunable assembly of complementary Platonic solids

Résumé

Depletion-induced tunable assembly of complementary Platonic solids Rahul Nag,1 Nina Rouvière,2 Jaime Gabriel Trazo,1 Jules Marcone,1 Nika Kutalia,1 Claire Goldmann,1 Marianne Impéror-Clerc,1 Damien Alloyeau,3 Doru Constantin,2 Cyrille Hamon1Multicomponent self-assembly has been explored to create novel metamaterials from nanoparticles of different sizes and compositions, but the assembly of nanoparticles with complementary shapes remains rare. Recent binary assemblies were mediated by DNA base pairing or induced by solvent evaporation. Here, we introduce depletion-induced self-assembly (DISA) as a novel approach for constructing tunable binary lattices, which fill the Euclidean R^3 space without gaps. This concept is central in certain areas of geometry and crystallography. In situ structural analysis demonstrates DISA of a binary mixture of gold octahedra and gold tetrahedra into extended supercrystals with Fm3 ̅m symmetry. The interparticle distance, adjustable by depletant concentration, offers a versatile method for assembling nanoparticles into ordered structures while they remain dispersed in a liquid phase. This work is relevant because (1) DISA is primarily used in the community for nanoparticle shape separation. Here, we demonstrate its novel application in forming a binary assembly. (2) In situ structural analysis performed at synchrotron are combined with ones obtained in liquid cell-TEM. Remarkably, the lattice parameters determined by the two methods and an analytical model are in very good agreement. (3) We show that DISA can control the packing fraction the binary assemblies in solution between φ=0.37 and φ=0.66, which is much lower than the dense space filling packing in the dry state (φ=1).

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Dates et versions

hal-05069982 , version 1 (16-05-2025)

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  • HAL Id : hal-05069982 , version 1

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Cyrille Hamon. Depletion-induced tunable assembly of complementary Platonic solids. Gold 2025, May 2025, San Sebastian, Spain, Spain. ⟨hal-05069982⟩
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