A magnetic solder for assembling bulk covalent adaptable network blocks

Zhang, Shuai; Zhang, Yubai; Wu, Yahe; Yang, Yang; Chen, Qiaomei; Liang, Huan; Wei, Yen; Ji, Yan

doi:10.1039/d0sc01678k

Cited by 16 publications

(32 citation statements)

References 55 publications

(55 reference statements)

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“…Notably, as we investigated previously, bulk CAN materials cannot be welded together by direct heat because the heating will act on all the samples, leading to the overwhelming shape destruction under pressure. Light is also very difficult to work on welding bulks, as the overlapped regions are covered by the thick “body” of the bulk material, making light blocked ( 40 ). By AMF-assisted welding, we fabricated monolithic magneto-responsive multimaterial actuators with heterogeneous structures (experimental details can be found in Materials and Methods).…”

Section: Resultsmentioning

confidence: 99%

“…Fe 3 O 4 NPs exhibit high magnetothermal conversion rates under the action of AMF and are commercially available (41,42). It was found that Fe 3 O 4 NPs were well distributed in common PU systems in our previous work (40). To obtain M-PULCEs with favorable large-scale shape deformations, we prepared liquid crystal (LC) oligomers to decrease the cross-link density and prolong the chain length of the LC moieties.…”

Section: Resultsmentioning

confidence: 99%

“…All the reagents were used directly without further purification. PU CANs and foams were fabricated following procedures described in the literature ( 40 ). The permanent magnet (made of NdFeB, size: 3.0 cm long × 2.0 cm wide × 0.5 cm thick) was purchased from Beijing HuaaoBio Company.…”

Section: Methodsmentioning

confidence: 99%

“…Besides, there are additional merits highly desired for new-generation soft actuators realized by our strategy. First, in our system, dynamic covalent bond exchange can be activated by AMF, so seamless assembling of either bulks (hard to be welded by heat or light) or thin sheets can be achieved via AMF-assisted welding ( 40 ). Various magneto-controlled actuators composed of multiple materials with sophisticated heterogeneous structures were also built (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Locally controllable magnetic soft actuators with reprogrammable contraction-derived motions

Zhang

Yang

et al. 2022

Sci. Adv.

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Reprogrammable magneto-responsive soft actuators capable of working in enclosed and confined spaces and adapting functions under changing situations are highly demanded for new-generation smart devices. Despite the promising prospect, the realization of versatile morphing modes (more than bending) and local magnetic control remains challenging but is crucial for further on-demand applications. Here, we address the challenges by maximizing the unexplored potential of magnetothermal responsiveness and covalent adaptable networks (CANs) in liquid crystalline elastomers (LCEs). Various magneto-actuated contraction-derived motions that were hard to achieve previously (e.g., bidirectional shrinkage and dynamic 3D patterns) can be attained, reprogrammed, and assembled seamlessly to endow functional diversity and complexity. By integration of LCEs with different magneto-responsive threshold values, local and sequential magnetic control is readily realized. Many magnetic actuation portfolios are performed by rationally imputing “logic switch” sequences. Meanwhile, our systems exhibit additional favorable performances including stepwise magnetic controllability, multiresponsiveness, self-healing, and remolding ability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Locally controllable magnetic soft actuators with reprogrammable contraction-derived motions

Zhang

Yang

et al. 2022

Sci. Adv.

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“…These compounds were identified as 3′-chlorotrypacidin ( 166 ), asterric acid ( 167 ), methylasterrate ( 168 ), methyl-4′,6′-dichloroasterrate ( 169 ), and methyl-4′-chloroasterrate ( 170 ). The inhibition rates of compounds 165 and 166 (at 500 μM) against Curvularia lunata were 100% and 67.6%, respectively, and they showed strong inhibitory activity against Bacillus subtilis [ 47 ]. An endophytic fungus isolated from the phloem of C. anglatus was identified as Fusarium proliferatum and three cyclopeptides isolated from this strain were named enniatin A1 ( 171 ), enniatin B1 ( 172 ) and enniatin B ( 173 ) [ 48 ] (Fig.…”

Section: Celastrus Anglatus Maximmentioning

confidence: 99%

Identification and Bioactivities of Secondary Metabolites Derived from Endophytic Fungi Isolated from Ethnomedicinal Plants of Tujia in Hubei Province: A Review

Yao

Liu

2021

Nat. Prod. Bioprospect.

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Tujia is a national minority, inhabiting in the mountainous Wuling area in China. Since 1978, Tujia medicine has been studied, summarized and developed, leading to numerous achievements by Chinese researchers, such as the publishing of approximately 30 monographs of Tujia medicine. These publications are focused on summarizing and improving the theory of Tujia medicine and developing clinical therapies from this system of medicine. The shortage of natural medicinal plants used in Tujia medicine has created the need to discover new resources to replace them and protect endangered natural plant species. Endophytic fungi are one of the conservation options, are considered a source of new bioactive natural products, and are a renewable and inexhaustible source of new drugs and agrochemicals. This review summarizes 260 compounds from endophytic fungi that have been previously isolated from the medicinal plants of Tujia. These compounds include steroids, terpenoids, meroterpenoids, polyketides, alkaloids, peptides, aliphatic compounds, aromatic compounds, and heterocyclic compounds. Graphic Abstract

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Magnetic‐responsive Covalent Adaptable Networks

Liang

Wei

2023

Chemistry An Asian Journal

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Covalent adaptable networks (CANs) are reprocessable polymers whose structural arrangement is based on the recombination of dynamic covalent bonds. Composite materials prepared by incorporating magnetic particles into CANs attract much attention due to their remote and precise control, fast response speed, high biological safety and strong penetration of magnetic stimuli. These properties often involve magnetothermal effect and direct magneticfield guidance. Besides, some of them can also respond to light, electricity or pH values. Thus, they are favorable for soft actuators since various functions are achieved such as magnetic-assisted self-healing (heating or at ambient temperature), welding (on land or under water), shape-morphing, and so on. Although magnetic CANs just start to be studied in recent two years, their advances are promised to expand the practical applications in both cutting-edge academic and engineering fields. This review aims to summarize recent progress in magnetic-responsive CANs, including their design, synthesis and application.

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A magnetic solder for assembling bulk covalent adaptable network blocks

Abstract: Covalent adaptable networks (CANs) can be reprocessed and recycled relying on reversible covalent bond structures. Magnetic solders enable flexibly welding of bulk CAN blocks by the magnetothermal effect induced bond exchange reactions.

Cited by 16 publications

References 55 publications

Locally controllable magnetic soft actuators with reprogrammable contraction-derived motions

Locally controllable magnetic soft actuators with reprogrammable contraction-derived motions

Identification and Bioactivities of Secondary Metabolites Derived from Endophytic Fungi Isolated from Ethnomedicinal Plants of Tujia in Hubei Province: A Review

Magnetic‐responsive Covalent Adaptable Networks

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