Switchable and orthogonal self-assemblies of anisotropic fibers

Xing, Peng; Chu, Xiaoxiao; Li, Shangyang; Xin, Feifei; Ma, Mingfang; Hao, Aiyou

doi:10.1039/c3nj00984j

Cited by 27 publications

(14 citation statements)

References 68 publications

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“…2b. Differences in the strain sweeps were also observed by Xing et al 22 Finally, if the gelation method is suitable, it is possible to show the assembly type using a rheological time sweep. We have described a number of systems where a slow pH trigger is used to induce gelation.…”

Section: View Article Onlinementioning

confidence: 57%

“…For example, Hao and co-workers used a host-guest system of two gelling components where they could trigger gelation in two different ways giving different types of interactions. 22 This could be seen directly in the IR spectra, with new peaks appearing and other peaks shifting. The spectra also revealed that incomplete self-sorting had occurred in the selfsorted system as a small amount of interaction with the second gelator could be detected.…”

Section: Spectroscopymentioning

confidence: 91%

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How should multicomponent supramolecular gels be characterised?

2018

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Low molecular weight gels, or supramolecular gels, are formed when small molecules self-assemble into fibrous structures. Above a critical concentration, the entanglement and cross-linking of these structures leads to the formation of a self-supporting gel. There are many examples where a single component is used to form such gels. There is however an ever-increasing interest in using multiple components. Here, if each component is able to form a gel by itself, a range of fibre types are possible, formed by either random or specific associations between the low molecular weight gelators (LMWG). The properties of the networks will depend on how the LMWG assemble into the primary fibrous structures and then how these primary structures entangle. As such, to understand these gels, it is necessary to understand the networks across multiple length scales. Here, we discuss the current state of the art, the effectiveness of the different techniques that have been used, and hopefully provide the impetus for the field to move away from the cartoon-level discussion of assembly.

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Section: View Article Onlinementioning

confidence: 57%

Section: Spectroscopymentioning

confidence: 91%

How should multicomponent supramolecular gels be characterised?

2018

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“…Designing synergistic self‐aggregation or coassembly from multiple components is of vital importance in supramolecular chemistry and materials science . Coassembly allows materials integration at a molecular scale, showing specific advantages over physical blend or hybrid at micro/nanoscale prepared by self‐sorting . For instance, liposome and polymersome, which are vesicles self‐assembled from lipids and polymeric amphiphiles, are often integrated with targeting ligands, drugs, and bioimaging agents as payloads.…”

Section: Introductionmentioning

confidence: 99%

Environment‐Adaptive Coassembly/Self‐Sorting and Stimulus‐Responsiveness Transfer Based on Cholesterol Building Blocks

Xing

Tham

et al. 2017

Advanced Science

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Manipulating the property transfer in nanosystems is a challenging task since it requires switchable molecular packing such as separate aggregation (self‐sorting) or synergistic aggregation (coassembly). Herein, a unique manipulation of self‐sorting/coassembly aggregation and the observation of switchable stimulus‐responsiveness transfer in a two component self‐assembly system are reported. Two building blocks bearing the same cholesterol group give versatile topological structures in polar and nonpolar solvents. One building block (cholesterol conjugated cynanostilbene, CCS) consists of cholesterol conjugated with a cynanostilbene unit, and the other one (C10CN) is comprised of cholesterol connected with a naphthalimide group having a flexible long alkyl chain. Their assemblies including gel, crystalline plates, and vesicles are obtained. In gel and crystalline plate phases, the self‐sorting behavior dominates, while synergistic coassembly occurs in vesicle phase. Since CCS having the cyanostilbene group can respond to the light irradiation, it undergoes light‐induced chiral amplification. C10CN is thermally responsive, whereby its supramolecular chirality is inversed upon heating. In coassembled vesicles, it is interestingly observed that their responsiveness can be transferred by each other, i.e., the C10CN segment is sensitive to the light irradiation, while CCS is thermoresponsive. This unprecedented behavior of the property transfer may shine a light to the precise fabrication of smart materials.

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“…Designing co-assembly from multi-components is of crucial significance in supramolecular chemistry. [20,21] Co-assembly enables components incorporation at a molecular scale, showing advantages over physical blend or hybrid at micro/nanoscale. Compared with the individual enantiomers (including homochiral and heterochiral molecules), the racemates have gathered particular attentions attributed to their faster assemble kinetics and higher aggregation propensity.…”

Section: Introductionmentioning

confidence: 99%

Rational Fabrication of Multiple Dimensional Assemblies from Tryptophan‐Based Racemate

Zhang

Qin

Xing

et al. 2021

Chemistry A European J

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Fabricating structural complex assemblies from simple amino acid-based derivatives is attracting great research interests due to their easy accessibility and preparation. However, the morphological regulation of racemates (an equimolar mixture of enantiomers) were largely overlooked. In this work, through rational modulation of kinetic and thermodynamic parameters, we achieved multiple dimensional architectures employing tryptophan-based racemate (RPWM). Upon assembling, 1D bundled nanofibers, 2D lamellar nanostructure and 3D urchin-like microflowers could be obtained depending on the solvents used. The corresponding morphology evolutions were successfully illustrated by changing the enantiomeric excess (ee) value. Moreover, for RPWM, uniform 0D nanospheres were formed in H 2 O under 4 °C, which could spontaneously convert into lamella under ambient temperature. Taking advantages of its temperature-responsive phase change behavior, RPWM assemblies exhibited excellent removal efficiency for organic dye RhB, and could be reused for several consecutive cycles without significant changes in its removal performance. Taken together, it's rational to envision that the engineering of racemates assembly pathways can greatly increase the robustness in a wide variety of supramolecular materials and further lead to their blooming versatile applications.

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Switchable and orthogonal self-assemblies of anisotropic fibers

Cited by 27 publications

References 68 publications

How should multicomponent supramolecular gels be characterised?

How should multicomponent supramolecular gels be characterised?

Environment‐Adaptive Coassembly/Self‐Sorting and Stimulus‐Responsiveness Transfer Based on Cholesterol Building Blocks

Rational Fabrication of Multiple Dimensional Assemblies from Tryptophan‐Based Racemate

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