Creating Regular Matrices of Aligned Silica Nanohelices: Theory and Realization
BATTIE, Yann
Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes [LCP-A2MC]
Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes [LCP-A2MC]
GONZALEZ-RODRIGUEZ, David
Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes [LCP-A2MC]
< Reduce
Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes [LCP-A2MC]
Language
en
Article de revue
This item was published in
Chemistry of Materials. 2020-01-06, vol. 32, n° 2, p. 821-829
American Chemical Society
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Silica
Elongated nano-object
Helix
Evaporation-induced self-assembly
Dip-coating
Capillarity theory
Origin
Hal imported