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Grégoire B, Dazas B, Hubert F, Tertre E, Ferrage E, Grasset L, Petit S. Orientation measurements of clay minerals by polarized attenuated total reflection infrared spectroscopy. J Colloid Interface Sci 2020; 567:274-284. [PMID: 32062490 DOI: 10.1016/j.jcis.2020.02.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 01/28/2020] [Accepted: 02/07/2020] [Indexed: 11/25/2022]
Abstract
The orientation and organization of molecular guests within the interlayer of clay minerals control the reactivity and performance of tailored organo-clay materials. Such a detailed investigation of hybrid structure on the molecular scale is usually provided by computational methods with limited experimental validation. In this study, polarized attenuated total reflection infrared spectroscopy was used to extract quantitative orientation measurements of montmorillonite particles. The validity of the evanescent electric field amplitude calculations necessary to derive the order parameter was critically evaluated to propose a methodology for determining the orientation of the normal to the clay layer relative to a reference axis, enabling comparison with the results obtained from X-ray scattering experiments and molecular dynamic simulations. Subsequently, the orientation of the interlayer water dipole and surface hydroxyls with respect to the normal of the clay layer was experimentally determined, showing good agreement with molecular simulations. This methodology may provide quantitative insights into the molecular-level description of interfacial processes between organic molecules and clay minerals.
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Affiliation(s)
- Brian Grégoire
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France.
| | - Baptiste Dazas
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Fabien Hubert
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Emmanuel Tertre
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Eric Ferrage
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Laurent Grasset
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Sabine Petit
- Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS-Université de Poitiers, 5 rue Albert Turpain, TSA 51106, 86073 Poitiers Cedex 9, France
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