Self-assembling properties of a series of homologous ester-diamides – from ribbons to nanotubes

Simon, François‐Xavier; Nguyen, Thi Thanh Tam; Díaz, Nancy; Schmutz, Marc; Demé, Bruno; Jestin, Jacques; Combet, J.; Mésini, Philippe J.

doi:10.1039/c3sm51369f

Cited by 18 publications

(27 citation statements)

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“…Similar associations play a role in amyloid diseases [ 158 ]. Mesini and coworkers studied a family of organogelators and report various self-assembled structures, including microtubes [ 159 ]. Recently, the adsorption of helical tapes on rigid surfaces was considered by Quint [ 160 ].…”

Section: Miscellaneous Topics and Outlookmentioning

confidence: 99%

Semiflexible Chains at Surfaces: Worm-Like Chains and beyond

et al. 2016

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Abstract:We give an extended review of recent numerical and analytical studies on semiflexible chains near surfaces undertaken at Institut Charles Sadron (sometimes in collaboration) with a focus on static properties. The statistical physics of thin confined layers, strict two-dimensional (2D) layers and adsorption layers (both at equilibrium with the dilute bath and from irreversible chemisorption) are discussed for the well-known worm-like-chain (WLC) model. There is mounting evidence that biofilaments (except stable d-DNA) are not fully described by the WLC model. A number of augmented models, like the (super) helical WLC model, the polymorphic model of microtubules (MT) and a model with (strongly) nonlinear flexural elasticity are presented, and some aspects of their surface behavior are analyzed. In many cases, we use approaches different from those in our previous work, give additional results and try to adopt a more general point of view with the hope to shed some light on this complex field.

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Section: Miscellaneous Topics and Outlookmentioning

confidence: 99%

Semiflexible Chains at Surfaces: Worm-Like Chains and beyond

et al. 2016

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“…This difference could also originate from a more complex organization that is not correctly described by a simple geometrical model. Furthermore, in previous work, we have shown that with freeze fracture, the diameter was only 3 to 4 nm higher than that observed by small-angle X-ray or neutron scattering [ 22 , 24 ]. This difference was due to the metal particles sputtered to form the replica.…”

Section: Resultsmentioning

confidence: 79%

Structure of Nanotubes Self-Assembled from a Monoamide Organogelator

Zapién-Castillo

Díaz-Zavala

Melo-Banda

et al. 2020

IJMS

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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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“…percent are composed of nanotubes with lengths of several micrometers and diameters of 27 nm with a very low dispersity (< 5 %). 17,18 Here we have studied this gelator in trans-decalin to prevent evaporation during the experiments, especially the rheological measurements. A striking feature of the G' and in G" curves in Fig.…”

Section: Resultsmentioning

confidence: 99%

Origin of Invariant Gel Melting Temperatures in the c–T Phase Diagram of an Organogel

et al. 2016

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Binary c-T phase diagrams of organogelators in solvent are frequently simplified to two domains, gel and sol, even when the melting temperatures display two distinct regimes, an increase with T and a plateau. Herein, the c-T phase diagram of an organogelator in solvent is elucidated by rheology, DSC, optical microscopy, and transmitted light intensity measurements. We evidence a miscibility gap between the organogelator and the solvent above a threshold concentration, cL. In this domain the melting or the formation of the gel becomes a monotectic transformation, which explains why the corresponding temperatures are nonvariant above cL. As shown by further studies by variable temperature FTIR and NMR, different types of H-bonds drive both the liquid-liquid phase separation and the gelation.

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Self-assembling properties of a series of homologous ester-diamides – from ribbons to nanotubes

Cited by 18 publications

References 50 publications

Semiflexible Chains at Surfaces: Worm-Like Chains and beyond

Semiflexible Chains at Surfaces: Worm-Like Chains and beyond

Structure of Nanotubes Self-Assembled from a Monoamide Organogelator

Origin of Invariant Gel Melting Temperatures in the c–T Phase Diagram of an Organogel

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