Simple design but marvelous performances: molecular gels of superior strength and self-healing properties

Xu, Zhiyan; Peng, Junxia; Yan, Ni; Yu, Hang; Zhang, Shasha; Liu, Kaiqiang; Fang, Yu

doi:10.1039/c2sm27208c

Cited by 104 publications

(70 citation statements)

References 59 publications

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“…As shown in Fig. 14 Additional evidences for π-π stacking come from UV-Vis spectra. 14 Additional evidences for π-π stacking come from UV-Vis spectra.…”

Section: Investigation Of the Driving Forcementioning

confidence: 93%

Supramolecular helical nanofibers assembled from a pyridinium-functionalized methyl glycyrrhetate amphiphile

Gao

Hao

et al. 2015

Nanoscale

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A glycyrrhetate-containing amphiphile, MGP (1-[2-(methyl glycyrrhetate)-2-oxoethyl]pyridinium bromide), has been synthesized, and found to assemble into supramolecular helical nanofibers in chloroform/aromatic solvents, which are primarily driven by π-π stacking, van der Waals forces, and hydrophobic interactions. During the assembly process, MGP stacked into J-aggregates resulting in the sequestration of the hydrophilic pyridinium cation within the interior with the concomitant projection of its hydrophobic skeleton on the outside surface. Ultimately, this protrusion generated a staggered angle due to the steric hindrance between stacked molecules. This staggered angle further led to molecular misalignments and the formation of helical fibrils, which could twist with each other to fabricate larger helical fibers. Consequently, a gel was formed by intertwining these nanofibers into three-dimensional networks. Using this strategy, we found that other triterpenoid-tailored pyridinium amphiphiles are also potential scaffolds for supramolecular helical structures. This work provides a facile approach for the fabrication of supramolecular macroscopic chiral nanostructures that originate from natural products.

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“…As shown in Fig. 14 Additional evidences for π-π stacking come from UV-Vis spectra. 14 Additional evidences for π-π stacking come from UV-Vis spectra.…”

Section: Investigation Of the Driving Forcementioning

confidence: 93%

Supramolecular helical nanofibers assembled from a pyridinium-functionalized methyl glycyrrhetate amphiphile

Gao

Hao

et al. 2015

Nanoscale

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“…For example, Xu et al observed that gels of a nitrobenzoxadiazole-containing cholesteryl derivative in THF-methanol and pyridine-methanol mixtures become stronger with increasing concentration of the gelator or methanol antisolvent, due to a transition from narrow fibrous aggregates to dense spheroidal particles several micrometres in diameter. 399 Not all gels are well described by the model of colloidal aggregation. Whereas Gʹ in floc-based networks commonly conforms to a power law with n > 3, particularly in the stronglink regime, many small-molecule gels exhibit Gʹ vs. c plots that are almost exactly quadratic.…”

Section: Gels Under Stressmentioning

confidence: 99%

Gels with sense: supramolecular materials that respond to heat, light and sound

2016

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. (2016) 'Gels with sense : supramolecular materials that respond to heat, light and sound.', Chemical society reviews., 45 (23). pp. 6546-6596. Further information on publisher's website:https://doi.org/10.1039/C6CS00435KPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Advances in the field of supramolecular chemistry have made it possible, in many situations, to reliably engineer soft materials to address a specific technological problem. Particularly exciting are "smart" gels that undergo reversible physical changes on exposure to remote, non-invasive environmental stimuli. This review explores the development of gels which are transformed by heat, light and ultrasound, as well as other mechanical inputs, applied voltages and magnetic fields. Focusing on small-molecule gelators, but with reference to organic polymers and metal-organic systems, we examine how the structures of gelator assemblies influence the physical and chemical mechanisms leading to thermo-, photo-and mechano-switchable behaviour. In addition, we evaluate how the unique and versatile properties of smart materials may be exploited in a wide range of applications, including catalysis, crystal growth, ion sensing, drug delivery, data storage and biomaterial replacement.

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“…To some extent, the combination of multiple noncovalent bonds, such as hydrogen bonding and p-p stacking interaction, is also effective. Therefore, Fang et al [59], fabricated a gelation that was comprised of four nitrobenzoxadiazole (NBD)-containing cholesteryl (Chol) derivatives. As for a gelation, it not only showed a superior gelling capacity, but also the formed gel possessed excellent mechanical strength with a yield stress value exceeding 23 kPa.…”

Section: Recent Advance Of Self-healing Polymers Via P-p Stackingmentioning

confidence: 99%