Biomimetic Supramolecular Fibers Exhibit Water‐Induced Supercontraction

Wu, Yuchao; Shah, Darshil U.; Wang, Baoyuan; Liu, Ji; Ren, Xiaohe; Ramage, Michael; Scherman, Oren A.

doi:10.1002/adma.201707169

Cited by 50 publications

(50 citation statements)

References 25 publications

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“…3d suggests that only CB [7] and CB [8] could apparently promote luminescence. CB [6] (considering the molecular size and availability, other CB[n] such as CB [10] and CB [14] were not used in this study) and glycoluril, which could hardly assemble with the FGGC peptide, exhibited no enhancement of the luminescence intensity of FGGC-AuNCs in aqueous solutions, further evidencing the crucial role of host-guest self-assembly to brighten FGGC-AuNCs.…”

Section: Enhanced Emission Of Cb/fggc-aunc Assembliesmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Remarkably, driven by multiple non-covalent interactions such as ion-dipole, hydrophobic and H-bonding effects, macrocyclic cucurbit[n]urils (CB[n], n ¼ 5-8, typically) exhibit a robust binding strength with elaborately tailored guests to form stable binary and ternary host-guest complexes in aqueous solutions. 9,10 In the past two decades, the advancements in CB[n]based host-guest self-assembly have greatly facilitated the design of functional materials ranging from single molecules to various nanostructures. [11][12][13][14][15] Contributing to the abundant recognition sites on surfaces, nanoparticles have been extensively integrated with host-guest self-assembly to obtain additional surprising functions.…”

Section: Introductionmentioning

confidence: 99%

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Cucurbiturils brighten Au nanoclusters in water

Jiang

Wang

et al. 2020

Chem. Sci.

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Section: Enhanced Emission Of Cb/fggc-aunc Assembliesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cucurbiturils brighten Au nanoclusters in water

Jiang

Wang

et al. 2020

Chem. Sci.

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“…Mechanical action is less noticeable and less prevalent in plants, but is fundamental in diurnal sun tracking of flowers, the opening of seed pods, the snap closure of the venus fly trap, and others . In recent times, the development of synthetic actuator materials that mimic the action of their natural counterparts has been an active area of research . Many examples of bending, twisting, and length‐changing materials have been demonstrated that can respond to a variety of stimuli including heat, light, electric or magnetic fields, chemical changes, or electrochemical charging .…”

Section: Introductionmentioning

confidence: 99%

Advanced Actuator Materials Powered by Biomimetic Helical Fiber Topologies

Spinks

2019

Advanced Materials

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where conventional mechanical drive systems, such as electric motors, are too large or too heavy. [13] Natural skeletal muscle is often used as a benchmark for comparing and evaluating synthetic artificial muscles. The three key attributes of any actuator are the force generated, the amount of movement produced, and the time taken to complete a full actuation cycle. Skeletal muscle, e.g., generates a blocked stress of ≈0.3 MPa, free strain of ≈20%, responds in ≈0.1 s, and has a density of 1037 kg m −3 . Combining these parameters gives a reasonable estimate of the peak powerto-weight ratio (PWR) for muscle at ≈300 W kg −1 . [14] The PWR for conventional motors, engines, and other actuators covers a wide range (1-10 4 W kg −1 ), and there is a rough scaling between weight and PWR. This scaling means that small motors are less powerful and at sizes of less than a few tens of grams, muscle outperforms any available engine or motor. This limitation is currently hampering the development of many needed technologies. For example, the current state-of-the-art, motor-driven prosthetic hands are impressive but still do not match the dexterity of a healthy human. In theory, low-profile and high PWR artificial muscles could replicate the full range of motion, grip types, and strengths of the hand. Recent demonstrations of artificial muscle powered robotic hands [15] highlight the need for improved actuator materials, fabrication strategies, and control processes. In fact, biomimetic actuators are yet to be developed that match all of the features of natural muscle including large stroke, high speed, efficiency, long operating life, silent operation, and safety for use in human contact. Great progress has been made in the development of artificial muscles, and the most recent significant example of twisted and coiled polymer fibers [16] exploits a helical fiber topology that has a similarity with many constructs found in nature. Helices are a recurring feature in many of nature's actuators, which poses the question of whether the helix introduces any particular mechanical advantage.The helix is a striking and ubiquitous feature in biology [17] with several examples illustrated in Figure 1. The double stranded DNA molecule is probably the most famous helix (or double helix), but similar structures pervade biology at all length scales from molecular to the macroscopic. Many protein molecules adopt an alpha-helix conformation and assemble into helical filaments, such as the thin filament in skeletal muscle.Helical constructs are ubiquitous in nature at all size domains, from molecular to macroscopic. The helical topology confers unique mechanical functions that activate certain phenomena, such as twining vines and vital cellular functions like the folding and packing of DNA into chromosomes. The understanding of active mechanical processes in plants, certain musculature in animals, and some biochemical processes in cells provides insight into the versatility of the helix. Most of these natural systems consist of helically orien...

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“…At the microstructural level, supercontraction occurs by the entropy-driven recoiling of molecular chains that had been first trapped in extended chain conformations by exposure to external loads in excess of the dry silk yield stress. 14,15 Absorbed water plasticizes the silk to open up molecular free volume that facilitates the retraction of chains to their high entropy, random coil conformations with concomitant macroscopic strain recovery.…”

Section: Introductionmentioning

confidence: 99%

Bio-Inspired Stretchable and Contractible Tough Fiber by the Hybridization of GO/MWNT/Polyurethane

Kim

Jang

Lee

et al. 2019

ACS Appl. Mater. Interfaces

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Spider silks represent stretchable and contractible fibers with high toughness. Those tough fibers with stretchability and contractibility are attractive as energy absorption materials, and they are needed for wearable applications, artificial muscles, and soft robotics. Although carbon-based materials and poly(vinyl alcohol) (PVA) composite fibers exhibit high toughness, they are still limited in low extensibility and an inability to operate in the wet-state condition. Herein, we report stretchable and contractible fiber with toughness that is inspired by the structure of spider silk. The bioinspired tough fiber provides 495 J/g of gravimetric toughness, which exceeds 165 J/g of spider silk. Besides, the tough fiber was reversibly stretched to-80% strain without damage. This toughness and stretchability are realized by hybridization of aligned graphene oxide/multiwalled carbon nanotubes in a polyurethane matrix as elastic amorphous regions and β-sheet segments of spider silk. Interestingly, the bioinspired tough fiber contracted up to 60% in response to water and humidity similar to supercontraction of the spider silk. It exhibited 610 kJ/ m3 of contractile energy density, which is higher than previously reported moisture driven actuators.

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Biomimetic Supramolecular Fibers Exhibit Water‐Induced Supercontraction

Cited by 50 publications

References 25 publications

Cucurbiturils brighten Au nanoclusters in water

Cucurbiturils brighten Au nanoclusters in water

Advanced Actuator Materials Powered by Biomimetic Helical Fiber Topologies

Bio-Inspired Stretchable and Contractible Tough Fiber by the Hybridization of GO/MWNT/Polyurethane

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