Fractal structures and silica films formed by the Treignac water on inert and biological surfaces

Agnès Smith; Fatima Zahra Abir; Youssef El Hafiane; Yann Launay; Céline Faugeron-Girard; Vincent Gloaguen; Thierry Devers; Anaïs Raynaud; Charlotte Moine; Jean Sainte-Laudy; Thibaud Latour; Jean-Francois Hausman; Gea Guerriero

doi:10.1039/D0NA00377H

Fractal structures and silica films formed by the Treignac water on inert and biological surfaces†

Agnès Smith,

*^a Fatima Zahra Abir,^a Youssef El Hafiane,^a Yann Launay,^a Céline Faugeron-Girard,^b Vincent Gloaguen,^b Thierry Devers,^c Anaïs Raynaud,^d Charlotte Moine,^d Jean Sainte-Laudy,^e Thibaud Latour,^f Jean-Francois Hausman^g and Gea Guerriero

^g

Author affiliations

* Corresponding authors

^a Institut de Recherche sur les Céramiques, CNRS UMR 7315, Université de Limoges, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
E-mail: agnes.smith@unilim.fr

^b Laboratoire Peirene, EA 7500, Université de Limoges, 123 Avenue Albert Thomas, 87060 Limoges cedex, France

^c Interfaces, Confinement, Matériaux et Nanostructures, CNRS UMR 7374, IUT de Chartres, Université d’Orléans, 1 bis rue de la Férollerie, CS 40059, 45071 Orléans cedex, France

^d Covertis, Ester Technopole, 1 avenue d'Ester, 87069 Limoges Cedex, France

^e Société des eaux de Source de Treignac (SEST), Le Borzeix, 19260 Treignac, France

^f IT for Innovative Services–Human Dynamics in Cognitive Environments, Luxembourg Institute of Science and Technology, 5 avenue des Hauts-Fourneaux, L-4362 Esch/Alzette, Luxembourg

^g Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, rue Bommel, Z. A. E. Robert Steichen, Hautcharage, Luxembourg

Abstract

The Treignac water is a natural mineral water containing mainly orthosilicic acid. On inert substrates, it forms a silica film with fractal structures which cannot be reproduced in laboratory-reconstituted water. These structures form by condensation of orthosilicic acid monomers, following the Witten–Sander model of diffusion-limited aggregation. On biological surfaces, such as tomato leaves, the Treignac water forms a silica film with a different morphology and devoid of fractal structures. The filmogenic properties of this natural mineral water are here discussed in the context of crop protection, as the silica film can provide a barrier and a platform for the immobilization of elicitors of plant defense responses.

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Fractal structures and silica films formed by the Treignac water on inert and biological surfaces†

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Fractal structures and silica films formed by the Treignac water on inert and biological surfaces

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