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Structure of Nanotubes Self-Assembled from a Monoamide Organogelator

Centro de Investigación en Petroquímica, Tecnológico Nacional de México-Instituto Tecnológico de Ciudad Madero, Prolongación Bahía de Aldair, Ave. de las Bahías, Parque de la Pequeña y Mediana Industria, Altamira 89600, Mexico
Institut Charles Sadron, Université de Strasbourg, CNRS, 23 rue du Loess, F-67000 Strasbourg, France
International Center for Frontier Research in Chemistry, 8 allée Gaspard Monge, 67000 Strasbourg, France
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(14), 4960;
Received: 8 June 2020 / Revised: 30 June 2020 / Accepted: 7 July 2020 / Published: 14 July 2020
(This article belongs to the Special Issue Assembly Superstructures in Chemistry)
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. View Full-Text
Keywords: nanotubes; monoamide; self-assembly; organogelators nanotubes; monoamide; self-assembly; organogelators
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MDPI and ACS Style

Zapién-Castillo, S.; Díaz-Zavala, N.P.; Melo-Banda, J.A.; Schwaller, D.; Lamps, J.-P.; Schmutz, M.; Combet, J.; Mésini, P.J. Structure of Nanotubes Self-Assembled from a Monoamide Organogelator. Int. J. Mol. Sci. 2020, 21, 4960.

AMA Style

Zapién-Castillo S, Díaz-Zavala NP, Melo-Banda JA, Schwaller D, Lamps J-P, Schmutz M, Combet J, Mésini PJ. Structure of Nanotubes Self-Assembled from a Monoamide Organogelator. International Journal of Molecular Sciences. 2020; 21(14):4960.

Chicago/Turabian Style

Zapién-Castillo, Samuel, Nancy P. Díaz-Zavala, José A. Melo-Banda, Duncan Schwaller, Jean-Philippe Lamps, Marc Schmutz, Jérôme Combet, and Philippe J. Mésini. 2020. "Structure of Nanotubes Self-Assembled from a Monoamide Organogelator" International Journal of Molecular Sciences 21, no. 14: 4960.

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