ACS Applied Materials & Interfaces
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2022
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IF 10.383
Yingying Zhang,Guanglin Fan,Jinqiang Jiang,Zhaotie Liu,Zhongwen Liu,Guo Li
Hydrogel actuators have gained considerable interest and experienced significant advancements in recent years. However, the programming of their actuating behaviors is still challenging. Herein, we report the development and regulation of gradient structures of hydrogels for programmable thermally responsive actuating behaviors. The hydrogel actuators are developed by controlling the photoreduction of Fe3+ ions coordinated with carboxylate groups from the substrates and their limited diffusion into the precursor solutions to act as both initiators and crosslinkers. The developed hydrogels show well-defined external geometries and controllable thicknesses under spatiotemporal control of ultraviolet irradiation. The shapes and the actuation amplitudes of the hydrogel actuators can be independently regulated by controlling the formation and photodissociation of Fe3+–carboxylate coordination in the formed gradient networks. Some interesting applications such as the lifting of an object with a specific shape and directional walking are realized. The proposed method can be extended to other hydrogel actuators with different compositions and stimuli-responsive behaviors.
研究领域:
材料科学
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生物医学工程
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PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Xin Zhang,Shanpeng Qiao,Hong Zhang,Bo Wang,Xu Zeng,Bo Ren,Xiaodong Yang
The literature on polyvinyl alcohol (PVA) films is extensive, however, these methods often necessitate intricate synthesis processes or the addition of plasticizers to modify the strength and water solubility of the PVA material. A high-strength UV radiation-resistant composite film by chelating Fe 3+ with lignin and PVA, which exhibits excellent hydrolysis resistance is developed. This composite film is prepared simply by incorporating a small amount of dealkalized lignin (APPL) and ferric chloride (FeCl 3 ) into PVA through a straightforward composite process. During the scanning test, it is noted that the film exhibits a high density of uniformly dispersed particles, endowing it with efficient ultraviolet absorption capabilities. The infrared and anti-dissolution tests reveal that the coordination of Fe 3+ with lignin imparts an outstanding hydrolysis resistance to the film, obviating the need for any extender, curing agent, acid or base. The tensile fracture strength reaches an impressive 187.81Mpa in the tensile test. UV and indicator card tests unequivocally demonstrate that the film achieves a remarkable 100% anti-UV efficiency. This Fe 3+ chelated lignin/PVA composite film, with its facile preparation, environmental sustainability, high strength, and outstanding anti-ultraviolet efficiency, can be deployed across diverse applications requiring robust protection against ultraviolet radiation.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Renewable Materials
·
2021
·Vol. 9
·期 8
·1365-1376
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IF 1.67
Li Yangling,Li Zhengrong,Yu Hui,Huang Gang,Pei Xiaopeng,Xu Kun,Wang Pixin,Tan Ying
In this work, the –catechol and –thiol modified starch was prepared by the esterification and amino condensation reaction, then a fully starch based hydrogel was prepared via the thiol-catechol Michael addition reaction. The starch hydrogel gained shape memory behaviors
by coordinate with Fe3+ ions at alkaline condition.1H-NMR had been used to character the structure of the starch derivatives and its character peaks. The hydrogel's modulus had also been measured before and after coordinating with Fe3+ ions in linear area and
the result showed that both the hydrogel's storage modulus and loss modulus kept constant in linear area from 0.1 rad/s to 100 rad/s, which demonstrated a good network was formed inside the hydrogel. Furthermore, the shape memory behaviors had been tested by changing the pH value in solution.
The result showed that the hydrogel can keep its temporary shape in high pH condition and recover to its original state after the shaped hydrogel immersed into acidic solution. This hydrogel might have great application prospects in the field of biomedical and engineering.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2018
·Vol. 56
·期 11
·865-876
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IF 2.499
Zuxiang Xu,Jinhui Li,Guorong Gao,Zongbao Wang,Yang Cong,Jing Chen,Jingbo Yin,Lei Nie,Jun Fu
Tough hydrogels have great potentials in soft robotics, artificial muscles, tissue replacement, and so on. Here we introduce novel tough hydrogels crosslinked by triblock copolymer (F127DA) micelles and metal coordination. The gels showed outstanding tensile strength (∼1–11 MPa), toughness (∼4–32 MJ m −3 ), and excellent self-recovery properties (∼56.8–87.2% toughness recovery in 9 min at room temperature). The mechanical and self-recovery properties could be manipulated by varying contents of micelles and/or COO − groups. Dynamic mechanical analysis of the hydrogels revealed apparent activation energy and relaxations for both physical interactions. In situ small-angle X-ray scattering measurements on hydrogels upon stretching revealed micelle deformations. XPS measurements on hydrogels before and after stretching revealed significant changes in the binding energy of Fe 3+ ions in the gels, suggesting the rupture of coordination bonds. The experimental results strongly suggest a synergistic effect from the micelle-crosslinking and Fe 3+ –COO − coordination on the strength, toughness, and self-recovery of the hydrogels. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 865–876
研究领域:
材料科学
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高分子化学
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生物医学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Xiaoxia Le,Wei Lu,He Xiao,Li Wang,Chunxin Ma,Jiawei Zhang,Youju Huang,Tao Chen
Poor, nontunable mechanical properties as well as finite shape memory performance pose a barrier to shape memory hydrogels to realize practical applications. Here, a new shape memory hydrogel with tunable mechanical properties and multishape memory effect was presented. Three programmable reversible systems including PBA-diol ester bonds, AAc-Fe3+, and coil–helix transition of agar were applied to memorize temporary shapes and endow the hydrogel with outstanding multishape memory functionalities. Moreover, through changing the cross-linking densities, the mechanical properties of the as-prepared hydrogel can be adjusted.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Yiming Luo,Shuo Zhang,Xinru Yang,Yang Shen,Mingxuan Liang,Yijia Lu
With advances in flexible electronics, hydrogels have found increasing use in applications such as wearable devices, soft robotics, and medical rehabilitation. However, conventional hydrogel synthesis methods remain complex and often yield structurally defective materials, hindering the optimal balance between high stretchability and high sensitivity. This limitation represents a major obstacle to practical applications. To overcome this challenge, we developed a PMVFC hydrogel featuring a double-network structure that leverages synergistic effects from three types of non-covalent bonds. The hydrogel comprised a dual-network framework of P(AM-co-VEImBr) and CMC Na, in which MBAA served as a covalent crosslinker to bridge the networks and establish a three-dimensional architecture. The carboxyl groups on CMC-Na formed hydrogen bonds with amide groups on the P(AM-co-VEImBr) backbone and also coordinated with Fe 3+ ions to generate stable ionic crosslinks. This synergistic interaction resulted in significantly enhanced mechanical properties (Stress = 0.65 MPa, Strain = 1425 %), along with improved tensile sensing performance (GF 1 = 12.27, GF 2 = 6.25, GF 3 = 5.94) and pressure sensing capability (S 1 = 0.3963 kPa −1 , S 2 = 0.0568 kPa −1 , S 3 = 0.0085 kPa −1 ). Sensors fabricated from this hydrogel successfully detected limb motion and transmitted signals using Morse code. Additionally, we created an array sensor based on the PMVFC hydrogel, providing a viable technical pathway for the development of high-performance human-machine interfaces and intelligent emergency response systems.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiao Wang,Jiahui Zhang,Xiaoting Li,Huiwen Yu,Lingcao Tan,Qiongyao Wang,Wenhua Xu,Baiping Xu,Shuping Xiao,Jiarong Huang
Shape memory polymers (SMPs) represent a prominent category of smart polymers that show attractive prospects in emerging fields of soft robots and biomedical devices. However, most of the existing SMPs show limitations in single-stimulus responsiveness and an imbalance between mechanical and shape memory properties. Herein, biological phytic acid served as a natural curing agent to vulcanize the biobased epoxidized natural rubber (ENR), while Fe3+ was introduced to construct a second cross-linked network based on coordination interaction. Polycaprolactone (PCL) was introduced and acted as net points to regulate the shape fixing behavior, while the dual cross-linked network provided strong resilience to achieve the shape recovery performance. Meanwhile, the Fe3+-based coordination complex not only served as sacrificial elements to realize tunable mechanical properties by effectively dissipating energy, but also acted as a photothermal agent to realize the light-induced shape memory behavior and thermoelectric power generation. The fabricated composites process multi-stimuli-responsive shape memory properties, photothermal capabilities, and tunable mechanical properties, exhibiting outstanding potential in harvesting sunlight for outdoor portable power generation and stimuli-responsive sensors.
研究领域:
材料科学
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高分子科学
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智能材料
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生物医学工程
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软体机器人
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光热转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）