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Structure of Nanotubes Self-Assembled from a Monoamide Organogelator

Some organic compounds are known to self-assemble into nanotubes in solutions, but the packing of the molecules into the walls of the tubes is known only in a very few cases. Herein, we study two compounds forming nanotubes in alkanes. They bear a secondary alkanamide chain linked to a benzoic acid...

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Autores principales: Zapién-Castillo, Samuel, Díaz-Zavala, Nancy P., Melo-Banda, José A., Schwaller, Duncan, Lamps, Jean-Philippe, Schmutz, Marc, Combet, Jérôme, Mésini, Philippe J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7404320/
https://www.ncbi.nlm.nih.gov/pubmed/32674288
http://dx.doi.org/10.3390/ijms21144960
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author Zapién-Castillo, Samuel
Díaz-Zavala, Nancy P.
Melo-Banda, José A.
Schwaller, Duncan
Lamps, Jean-Philippe
Schmutz, Marc
Combet, Jérôme
Mésini, Philippe J.
author_facet Zapién-Castillo, Samuel
Díaz-Zavala, Nancy P.
Melo-Banda, José A.
Schwaller, Duncan
Lamps, Jean-Philippe
Schmutz, Marc
Combet, Jérôme
Mésini, Philippe J.
author_sort Zapién-Castillo, Samuel
collection PubMed
description Some organic compounds are known to self-assemble into nanotubes in solutions, but the packing of the molecules into the walls of the tubes is known only in a very few cases. Herein, we study two compounds forming nanotubes in alkanes. They bear a secondary alkanamide chain linked to a benzoic acid propyl ester (HUB-3) or to a butyl ester (HUB-4). They gel alkanes for concentrations above 0.2 wt.%. The structures of these gels, studied by freeze fracture electron microscopy, exhibit nanotubes: for HUB-3 their external diameters are polydisperse with a mean value of 33.3 nm; for HUB-4, they are less disperse with a mean value of 25.6 nm. The structure of the gel was investigated by small- and wide-angle X-ray scattering. The evolution of the intensities show that the tubes are metastable and transit slowly toward crystals. The intensities of the tubes of HUB-4 feature up to six oscillations. The shape of the intensities proves the tubular structure of the aggregates, and gives a measurement of 20.6 nm for the outer diameters and 11.0 nm for the inner diameters. It also shows that the electron density in the wall of the tubes is heterogeneous and is well described by a model with three layers.
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spelling pubmed-74043202020-08-18 Structure of Nanotubes Self-Assembled from a Monoamide Organogelator Zapién-Castillo, Samuel Díaz-Zavala, Nancy P. Melo-Banda, José A. Schwaller, Duncan Lamps, Jean-Philippe Schmutz, Marc Combet, Jérôme Mésini, Philippe J. Int J Mol Sci Article Some organic compounds are known to self-assemble into nanotubes in solutions, but the packing of the molecules into the walls of the tubes is known only in a very few cases. Herein, we study two compounds forming nanotubes in alkanes. They bear a secondary alkanamide chain linked to a benzoic acid propyl ester (HUB-3) or to a butyl ester (HUB-4). They gel alkanes for concentrations above 0.2 wt.%. The structures of these gels, studied by freeze fracture electron microscopy, exhibit nanotubes: for HUB-3 their external diameters are polydisperse with a mean value of 33.3 nm; for HUB-4, they are less disperse with a mean value of 25.6 nm. The structure of the gel was investigated by small- and wide-angle X-ray scattering. The evolution of the intensities show that the tubes are metastable and transit slowly toward crystals. The intensities of the tubes of HUB-4 feature up to six oscillations. The shape of the intensities proves the tubular structure of the aggregates, and gives a measurement of 20.6 nm for the outer diameters and 11.0 nm for the inner diameters. It also shows that the electron density in the wall of the tubes is heterogeneous and is well described by a model with three layers. MDPI 2020-07-14 /pmc/articles/PMC7404320/ /pubmed/32674288 http://dx.doi.org/10.3390/ijms21144960 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zapién-Castillo, Samuel
Díaz-Zavala, Nancy P.
Melo-Banda, José A.
Schwaller, Duncan
Lamps, Jean-Philippe
Schmutz, Marc
Combet, Jérôme
Mésini, Philippe J.
Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title_full Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title_fullStr Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title_full_unstemmed Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title_short Structure of Nanotubes Self-Assembled from a Monoamide Organogelator
title_sort structure of nanotubes self-assembled from a monoamide organogelator
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7404320/
https://www.ncbi.nlm.nih.gov/pubmed/32674288
http://dx.doi.org/10.3390/ijms21144960
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