Self-supporting thin films of imogolite and imogolite-like nanotubes for infrared spectroscopy

Yuanyuan Liao 1 Pierre Picot 1 Jean-Blaise Brubach 2 Pascale Roy 2 Sophie Le Caër 1 Antoine Thill 1
1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
2 SSOLEIL - Synchrotron SOLEIL
Abstract : Due to their narrow and well-defined structure, single wall nanotube, aluminosilicate nanotubes (imogolites) are excellent candidates to study how water is modified by either confinement or by the interface nature. A protocol is provided here to produce imogolite films that are ideally suited for infrared studies. Two types of imogolites were selected: a hydrophilic imogolite (IMO-OH) with inner surface fully covered with Si–OH hydrophilic groups and a hybrid imogolite (IMO-CH 3) with inner surface fully covered with hydrophobic Si–CH 3 groups. Films with different thicknesses were characterized by Small Angle X-ray Scattering (SAXS). The initial water content and the porosity of the films were estimated from ThermoGravimetric Analysis (TGA). Infrared spectroscopy was used to deduce the molar absorption coefficient of the bending mode that is significantly modified in confined water as compared to bulk water. Moreover, the interest of these films which allow avoiding extra-absorption features from the salt matrix or the supporting wafer is illustrated by an infrared study of the processes occurring in the IMO-OH film when it is heated from room temperature up to 350 °C. The evolution of the IR bands while heating shows the dehydration/dehydroxylation processes.
Keywords : Imogolite Films Infrared spectroscopy Water Dehydration/dehydroxylation Bending
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01543018
Contributor : Serge Palacin <>
Submitted on : Tuesday, June 20, 2017 - 1:48:29 PM
Last modification on : Thursday, February 7, 2019 - 4:07:38 PM

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CEA | CNRS | DSM-IRAMIS | PUBNIMBE | IRAMIS-NIMBE | SYNCHROTRON-SOLEIL | UNIV-PARIS-SACLAY | INC-CNRS | CEA-DRF | CEA-UPSAY

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Yuanyuan Liao, Pierre Picot, Jean-Blaise Brubach, Pascale Roy, Sophie Le Caër, et al.. Self-supporting thin films of imogolite and imogolite-like nanotubes for infrared spectroscopy. Applied Clay Science, Elsevier, 2017, 164, pp.58-67. ⟨10.1016/j.clay.2017.06.005⟩. ⟨cea-01543018⟩

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