GAO, Jie; SEMLALI, Sanaa; HUNEL, Julien; MONTERO, David; BATTIE, Yann; GONZALEZ-RODRIGUEZ, David; ODA, Reiko; DRISKO, Glenna; POUGET, Emilie

doi:10.1021/acs.chemmater.9b04372

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GAO, Jie
Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

SEMLALI, Sanaa
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HUNEL, Julien
Institut des Sciences Moléculaires [ISM]

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Chemistry of Materials. 2020-01-06, vol. 32, n° 2, p. 821-829

American Chemical Society

Résumé en anglais

Here, we exercise nanoscale control over the assembly of highly anisotropic silica helices using convective flow by using the physical properties occurring during evaporation-induced self-assembly. Organizing and patterning such chiral elongated objects over large surfaces in a controllable and reproducible fashion are challenging but desirable to optimize the performance of biomimetic structures, nanosensors (mechanical properties of helices), or optical materials (chiral objects have asymmetric interactions with light as absorption is different for left- and right-handed polarization). The coupling of evaporation forces and physicochemical solution properties induce specific helix alignment, and the stick–slip phenomenon produces a periodical deposition of bands with controllable and regular spacing. Helix orientation, packing density, and spacing can then be tuned. We observe the effect of polymer additives, silica helix concentration, and substrate withdrawal speed on the quality and orientation of the helix deposition. Theoretical modeling based on capillary hydrodynamics is developed to describe the relationship between evaporative conditions and pitch distance, the band width of the stick region, and the helix orientation.< Réduire

Mots clés en anglais

Silica

Elongated nano-object

Helix

Evaporation-induced self-assembly

Dip-coating

Capillarity theory

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Creating Regular Matrices of Aligned Silica Nanohelices: Theory and Realization

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