Surfactant-based lyotropic liquid crystal gels – the interplay between anisotropic order and gel formation

Steck, Katja; Dieterich, Sonja; Gießelmann, Frank

doi:10.1039/d0tc00561d

Cited by 22 publications

(19 citation statements)

References 55 publications

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“…disordered entangled fibres) or anisotropic (e.g. lamellar) nano and meso-structures having interesting mechanical properties and potential applications [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Nanofibres, whether reported in the shape of nanotubes [14], twisted or helical ribbons [15], are an interesting form of self-assembled structure found in lipids [16,17], peptides [18], lipid peptides [19] and proteins [20]. Generally driven by both specific (H-bonding, π-π stacking) intermolecular forces and non-specific (steric hindrance, hydrophobic effect) interactions [12,13,21], sometimes driven by interactions with chiral counterions [22], selfassembled fibrillar networks (SAFiN) are often involved in the development of soft gelled materials [12,13,[23][24][25], with applications as scaffolds for tissue engineering [26], wound healing [27] and cancer treatment [28].…”

Section: Introductionmentioning

confidence: 99%

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Palmitic acid sophorolipid biosurfactant: from self-assembled fibrillar network (SAFiN) to hydrogels with fast recovery

Baccile

Messaoud

Griel

et al. 2021

Phil. Trans. R. Soc. A.

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Nanofibres are an interesting phase into which amphiphilic molecules can self-assemble. Described for a large number of synthetic lipids, they were seldom reported for natural lipids like microbial amphiphiles, known as biosurfactants. In this work, we show that the palmitic acid congener of sophorolipids (SLC16:0), one of the most studied families of biosurfactants, spontaneously forms a self-assembled fibre network (SAFiN) at pH below 6 through a pH jump process. pH-resolved in situ small-angle X-ray scattering (SAXS) shows a continuous micelle-to-fibre transition, characterized by an enhanced core–shell contrast between pH 9 and pH 7 and micellar fusion into a flat membrane between pH 7 and pH 6, approximately. Below pH 6, homogeneous, infinitely long nanofibres form by peeling off the membranes. Eventually, the nanofibre network spontaneously forms a thixotropic hydrogel with fast recovery rates after applying an oscillatory strain amplitude out of the linear viscoelastic regime: after being submitted to strain amplitudes during 5 min, the hydrogel recovers about 80% and 100% of its initial elastic modulus after, respectively, 20 s and 10 min. Finally, the strength of the hydrogel depends on the medium's final pH, with an elastic modulus fivefold higher at pH 3 than at pH 6. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 1)’.

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“…disordered entangled fibres) or anisotropic (e.g. lamellar) nano and meso-structures having interesting mechanical properties and potential applications [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palmitic acid sophorolipid biosurfactant: from self-assembled fibrillar network (SAFiN) to hydrogels with fast recovery

Baccile

Messaoud

Griel

et al. 2021

Phil. Trans. R. Soc. A.

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“…Self-assembling of low-molecular-weight gelators in LLCs via noncovalent interactions has emerged as an attractive strategy to obtain physical gels retaining the lyotropic mesophases. 16,17 Giesselmann et al exemplified gelation of nematic, L α , and H I LLCs by fibrillar self-assemblies of fatty acid, steroid, and amino acid-based gelators. 16,18 Although the physically gelated LLCs had stable geometric shapes under ambient conditions, they returned to the flow state readily through the temper- ature-induced gel-to-sol transition.…”

Section: Introductionmentioning

confidence: 99%

Mesomorphic Polymer Hydrogel Stabilizing Ionic Surfactant Self-Assembly for Fuel Cells

Yang

Tan

et al. 2022

Ind. Eng. Chem. Res.

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Lyotropic self-assembly of ionic surfactants benefits the construction of ion-conductive pathways but suffers from poor mechanical stability owing to the intrinsic fluidity. Here, a novel mesomorphic polymer hydrogel, featuring a porous network of the cross-linked polymer trapping lyotropic selfassembly of ionic surfactants, is presented for fuel cells. The mesomorphic hydrogel, which is facilely derived from radical polymerization of an acrylamide monomer and a cross-linker in an aqueous solution of 1-tetradecyl-3methylimidazolium hydrogen sulfate, exhibits not only a lamellar lyotropic liquid crystal phase but also reversible tensile, compressive, and shear deformations. Macroscopic alignment of the mesomorphic hydrogel is achieved by lowfrequency shear, and ionic conductivity is promoted to 166 mS cm −1 by virtue of the aligned ion-conductive channels. A hydrogen fuel cell is fabricated from the mesomorphic polymer hydrogel, and a peak power density of 48 mW cm −2 is achieved. Overall, this work provides a strategy to endow functional lyotropic self-assembly with mechanical strengths for diverse electrochemical applications.

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“…In order to fully understand and subsequently utilize the given thermoresponsive effects, a separation of the observed transitions is essential. Gelation processes at low temperatures potentially lead to different morphologies of the LLC phase . We want to investigate if these could translate into different orientations of the solute investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Gelation processes at low temperatures potentially lead to different morphologies of the LLC phase. 18 We want to investigate if these could translate into different orientations of the solute investigated.…”

Section: ■ Introductionmentioning

confidence: 99%

Thermoreversible Gelation of Homopolyglutamates PBPMLG, PBPELG, and PBPHLG: Another Step toward de Novo RDC-Based Structure Elucidation

et al. 2022

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Residual dipolar couplings (RDCs) offer great potential in modern structure elucidation of organic compounds. Current developments focus on “smart” alignment media, which are able to change the induced alignment via external stimuli to enable de novo structure elucidation. We recently introduced poly-γ-p-biphenylmethyl-l-glutamate (PBPMLG) as a thermoresponsive alignment medium with outstanding enantiodiscriminating properties. In this work we present PBPMLG derivates containing spacer groups, separating the biphenyl mesogene of the side chain from the α-helical backbone, with the aim of better understanding the underlying effects and potentially inducing further orientations. Two thermoresponsive effects were observed separately: first, the 90° reorientation of the helix with respect to the external magnetic field and, second, a gelation of the LLC phase. The thermoresponsive gelation has been thoroughly investigated via NMR, polarized optical microscopy, and rheometry. We discuss the implication of the effects observed on RDC-based structure elucidation protocols.

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Surfactant-based lyotropic liquid crystal gels – the interplay between anisotropic order and gel formation

Abstract: Surfactant-based lyotropic liquid crystal gels (LLCGs) are soft materials which combine the anisotropic order of a surfactant-based lyotropic liquid crystal with the mechanical stability of a gel.

Cited by 22 publications

References 55 publications

Palmitic acid sophorolipid biosurfactant: from self-assembled fibrillar network (SAFiN) to hydrogels with fast recovery

Palmitic acid sophorolipid biosurfactant: from self-assembled fibrillar network (SAFiN) to hydrogels with fast recovery

Mesomorphic Polymer Hydrogel Stabilizing Ionic Surfactant Self-Assembly for Fuel Cells

Thermoreversible Gelation of Homopolyglutamates PBPMLG, PBPELG, and PBPHLG: Another Step toward de Novo RDC-Based Structure Elucidation

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