Gel-to-gel non-variant transition of an organogel caused by polymorphism from nanotubes to crystallites

Schwaller, Duncan; Zapién-Castillo, Samuel; Carvalho, Alain; Combet, J.; Collin, Dominique; Jacomine, Léandro; Kékicheff, Patrick; Heinrich, Benoît; Lamps, Jean-Philippe; Díaz-Zavala, Nancy P.; Mésini, Philippe J.

doi:10.1039/d1sm00195g

Cited by 5 publications

(9 citation statements)

References 32 publications

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“…The main difficulty comes from the fact that the internal structure of the organogels can be easily destroyed. Organogels are lyotrop systems that can undergo polymorphic phase transitions upon concentration change. − Hence, scanning electron microscopy (SEM) was not a suitable technique as the solvent needs to be removed prior to the observation (leading to a xerogel). To keep intact as much as possible the structure of the gel, cryo-SEM measurements were performed using a JEOL High Resolution 6700F SEM.…”

Section: Methodsmentioning

confidence: 99%

Effect of Solvent on the Mechanical and Structural Properties of N-Alkyldiamide Organogels

et al. 2021

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Here, we study organogels prepared thanks to a new organogelator, the N-oleyldiamide molecule, which shows a remarkable propensity to gelify a large scope of solvents, from aprotic to high protic solvents. The solvent plays a key role in the formation and stability of supramolecular self-assemblies. However, the understanding and the control of its effects can be complex as many parameters are a priori involved. This study aims to understand the effect of solvent on the structures of organogels and on their final mechanical properties. Five solvent classes have been selected ranking from low protic to high protic, according to the Hansen H-bond parameter δh. The solvent proticity appears to be one of the main parameters that affect the organogel internal structure and therefore the final rheological properties. For a given organogelator fraction, the terminal elastic modulus measured by oscillatory rheology is observed to increase significantly with the Hansen H-bond solvent parameter δh. Materials of different mechanical properties are then shown to display various structures, which are investigated thanks to cryo-SEM. Besides, wide-angle X-ray scattering (WAXS) has been used to probe the gelator organization at the molecular scale with regard to the solvent nature, to understand the supramolecular self-assembly of this promising molecule.

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Section: Methodsmentioning

confidence: 99%

Effect of Solvent on the Mechanical and Structural Properties of N-Alkyldiamide Organogels

et al. 2021

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“…Gel-to-gel transition was observed in different systems upon ageing. HUB-4 ( Figure 18 ) forms gel in alkanes with concentration > 0.5 wt% in various alkanes [ 58 ].…”

Section: Gel–gel Transitionsmentioning

confidence: 99%

“…The c - T phase diagram of HUB-4 / trans- decalin upon heating ( Figure 20 ) was established over a decade of concentrations by the same techniques [ 58 ]. The structure and the relative stability of gel 1 and gel 2 were studied by SEM and X-ray scattering.…”

Section: Gel–gel Transitionsmentioning

confidence: 99%

Beyond Sol-Gel: Molecular Gels with Different Transitions

Yilmazer

Schwaller

Mésini

2023

Gels

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The existence of sol–gel transitions is one of the most manifest properties of molecular gels. These transitions reflect their nature since they correspond to the association or dissociation of low weight molecules through non-covalent interactions to form the network constitutive of the gel. Most described molecular gels undergo only one gel-to-sol transition upon heating, and the reverse sol-to-gel transition upon cooling. It has been long observed that different conditions of formation could lead to gels with different morphologies, and that gels can undergo a transition from gel to crystals. However, more recent publications report molecular gels which exhibit additional transitions, for instance gel-to-gel transitions. This review surveys the molecular gels for which, in addition to sol–gel transitions, transitions of different nature have been reported: gel-to-gel transitions, gel-to-crystal transition, liquid–liquid phase separations, eutectic transformations, and synereses.

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“…32 We have recently shown that palmitoylethanolamide, an endogenous fatty amide sold as a nutraceutical, is able to gel edible oils. 33…”

Section: Introductionmentioning

confidence: 99%

“…32 We have recently shown that palmitoylethanolamide, an endogenous fatty amide sold as a nutraceutical, is able to gel edible oils. 33 For applications in food chemistry, it is necessary to know and control the thermal stability of the gels, their mechanical properties at different temperatures (e.g. at fridge and body temperature) and their phase behaviors.…”

Section: Introductionmentioning

confidence: 99%

Impact of polymorphism in oleogels of N-palmitoyl-l-phenylalanine

et al. 2023

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Gel-to-gel non-variant transition of an organogel caused by polymorphism from nanotubes to crystallites

Abstract: An amide based gelator forms gels in trans-decalin. Below concentrations of 1 wt. % the gels melt at temperatures varying with concentration. Above concentration of 1 wt. %, upon heating,...

Cited by 5 publications

References 32 publications

Effect of Solvent on the Mechanical and Structural Properties of N-Alkyldiamide Organogels

Effect of Solvent on the Mechanical and Structural Properties of N-Alkyldiamide Organogels

Beyond Sol-Gel: Molecular Gels with Different Transitions

Impact of polymorphism in oleogels of N-palmitoyl-l-phenylalanine

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