CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yunpeng Shi,Guangqiang Fang,Zhengli Cao,Feizhou Shi,Qian Zhao,Zizheng Fang,Tao Xie
Reversible shape memory polymers (SMPs) have received extensive attention because of their unique deformation mechanisms and diverse shape-changing behaviors. However, the traditional methods of fabricating reversible SMPs usually result in the limitation of the accessible shapes and the corresponding shape-shifting behaviors. Herein, a reversible SMP with two crystalline phases is digital light-cured via thiol-acrylate chemistry with the assist of a digital light processing (DLP) technology. Thus, a set of special geometric patterns can be obtained by digitally defined exposure regions with a specified time, allowing the achievement of the 3D kirigami or origami reversible actuation. In addition, this strategy can be extended to the emerging advanced 3D or 4D printing technologies by introducing z-axis dimension or time gradient, facilitating the fabrication of sophisticated reprogrammable reversible shape memory devices, including 4D printed grabber and 3D printed movable cartoon character. Our approach based on DLP enables the rapid and precise manipulation of shape-changing materials, which can extend the possibilities for future development in aerospace and other potential applications.
研究领域:
材料科学
·
增材制造
·
高分子化学
·
机械工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Kaojin Wang,Han Si,Xianchao Du,Pengbo Han,Gaohuai Mei,Yanhua Cheng,Anjun Qin,Ben Zhong Tang
Bulk polymers generally exhibit faster response, higher shape-deformation speed, and stronger mechanical properties than the hydrogels. However, it still remains a formidable challenge to enable bulk polymers to exhibit reversible changes in shape and fluorescence simultaneously. Herein, for the first time, the temperature-responsive reversible changes in fluorescence color, brightness, and shape of semi-crystalline poly( ε -caprolactone) (PCL) network doped with a D-A based aggregation-induced emission luminogen (AIEgen) is realized. The fabricated flower-like and dragonfly-shaped actuators show reversible blooming-closing and wing fanning behaviors, respectively, as well as reversible fluorescence-changing effects. Notably, the response and shape-deformation speed as well as mechanical properties of the system is much better than the reported hydrogels. Moreover, a smart switch is developed to demonstrate the potential applications. The stick fabricated by the sample can lift and release an object 1000 times larger than its weight, serving as a color-changing artificial muscle. This material design strategy may shine light on the design and preparation of other reversible shape-deformation polymers in combination with stimuli-responsive luminescence-changing AIEgens, such as mechanochromic, thermochromic, and photochromic luminogens.
研究领域:
材料科学
·
聚合物化学
·
智能材料
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 44
·9183-9190
·
IF 6.331
Jingda Tang,Bonan Sun,Qianfeng Yin,Meng Yang,Jian Hu,Tiejun Wang
Magnetic hydrogels have demonstrated great potential in soft robots, drug delivery, and bioengineering, and their functions are usually determined by the deforming capability. However, most magnetic hydrogels are embedded with soft magnetic particles (e.g. Fe3O4), where the magnetic domains cannot be programmed and retained under external magnetic fields. Here, we present a strategy to prepare a microgel-reinforced magnetic hydrogel, embedded with hard magnetic NdFeB particles. These magnetic hydrogels show outstanding mechanical properties (ultimate stretching ratio >15 and fracture toughness >15 000 J m−2) and fast actuation speed under external magnetic fields. We use direct ink writing to fabricate magnetic hydrogels with sophisticated geometry and program their magnetization to achieve complex deformations. Fast, reversible, shape-changing structures have been demonstrated with printed magnetic hydrogels. It is hoped that this material system of hard magnetic hydrogels can open opportunities for wide applications.
研究领域:
材料科学
·
机器人技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 36
·5217-5228
·
IF 5.582
Xiwei Xu,Songqi Ma,Hongzhi Feng,Jianfan Qiu,Sheng Wang,Zhen Yu,Jin Zhu
Development of covalent adaptable networks (CANs) has connected thermosets and thermoplastics and brought about various functions. However, combining the high performance of thermosets and fast reprocessability of thermoplastics is still a challenge for CANs. Herein, we proposed a strategy of dissociate transfer exchange (DTE) of tandem dynamic bonds to achieve continuous reprocessability for CANs without compromising thermal and mechanical properties. Epoxy monomers with tandem imine and disulfide bonds were synthesized and cross-linked to produce CANs. The dissociation of disulfide bonds significantly increased the mobility of imine bonds in series with the breaking points, leading to a fast exchange rate and reprocessability and the high cross-link density and rigidity of the network provided good thermal and mechanical properties. We anticipate that this strategy can efficiently accelerate various functions such as shape-shifting and self-healing as well as reprocessing and welding and should be universally applied to other tandem dynamic systems.
研究领域:
材料科学
·
高分子化学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Ruijue Cao,Guancong Chen,Linhong Wang,Wang Wang,Chujun Ni,Zhuoheng Xia,Anni Hu,Wei Hu,Hailu Lin,Pengxu Qian,Fan Yang,Qian Zhao
Controllable tissue expansion is critical in regenerative medicine to address skin or mucosal defects. Tissue expanders based on isotropic water filling or swelling offer a clinical solution but face challenges in addressing individual anatomical complexities. Here, a 4D printing biocompatible hydrogel expander with customizable designs is reported. Water-swellable polymer sheets with non-swellable elastomer frameworks are synthesized via digital photocuring. The sheets buckle upon adsorption of tissue fluids to execute anisotropic and programmable morphing, forming predesigned 3D structures with time as the fourth dimension for the shape changing. With an initial thickness of 1.0 mm, which is remarkably thinner than previous devices (typically 3–5 mm), the expander enabled minimally invasive implantation in the rat scalp. After 5 days’ implantation, the skin area and weight respectively increase to two and three folds without tissue damage, illustrating that the buckling-based strategy provides a safer yet accelerated expansion effect over previous devices. RNA sequencing indicates that the buckling-induced regeneration involving epithelial-to-mesenchymal transition (EMT) may be affected by the PI3K-AKT pathway. This work provides an inspiring strategy for personalized regeneration medicine.
研究领域:
再生医学
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生物医学工程
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4D打印
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组织工程
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水凝胶技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Gels
·
2023
·Vol. 9
·期 6
·438
·
IF 4.6
Chao Ma,Shuyi Peng,Lian Chen,Xingyu Cao,Ye Sun,Lin Chen,Lang Yang,Chunming Ma,Qijie Liu,Zhenzhong Liu,Shaohua Jiang
Stimuli-responsive color-changing and shape-changing hydrogels are promising intelligent materials for visual detections and bio-inspired actuations, respectively. However, it is still an early stage to integrate the color-changing performance and shape-changing performance together to provide bi-functional synergistic biomimetic devices, which are difficult to design but will greatly expand further applications of intelligent hydrogels. Herein, we present an anisotropic bi-layer hydrogel by combining a pH-responsive rhodamine-B (RhB)-functionalized fluorescent hydrogel layer and a photothermal-responsive shape-changing melanin-added poly (N-isopropylacrylamide) (PNIPAM) hydrogel layer with fluorescent color-changing and shape-changing bi-functional synergy. This bi-layer hydrogel can obtain fast and complex actuations under irradiation with 808 nm near-infrared (NIR) light due to both the melanin-composited PNIPAM hydrogel with high efficiency of photothermal conversion and the anisotropic structure of this bi-hydrogel. Furthermore, the RhB-functionalized fluorescent hydrogel layer can provide rapid pH-responsive fluorescent color change, which can be integrated with NIR-responsive shape change to achieve bi-functional synergy. As a result, this bi-layer hydrogel can be designed using various biomimetic devices, which can show the actuating process in the dark for real-time tracking and even mimetic starfish to synchronously change both the color and shape. This work provides a new bi-layer hydrogel biomimetic actuator with color-changing and shape-changing bi-functional synergy, which will inspire new strategies for other intelligent composite materials and high-level biomimetic devices.
研究领域:
材料科学
·
化学
·
仿生学
·
智能材料
·
执行器
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhu Qing Li,Du Cong,Dai Yahao,Daab Matthias,Matejdes Marian,Breu Josef,Hong Wei,Zheng Qiang,Wu Zi Liang
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as the motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators to achieve similar purposes. Here we report a hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered by light irradiation. A muscle-like poly( N -isopropylacrylamide) nanocomposite hydrogel is prepared by electrical orientation of nanosheets and subsequent gelation. Patterned anisotropic hydrogels are fabricated by multi-step electrical orientation and photolithographic polymerization, affording programmed deformations. Under light irradiation, the gold-nanoparticle-incorporated hydrogels undergo concurrent fast isochoric deformation and rapid increase in friction against a hydrophobic substrate. Versatile motion gaits including crawling, walking, and turning with controllable directions are realized in the soft robots by dynamic synergy of localized shape-changing and friction manipulation under spatiotemporal light stimuli. The principle and strategy should merit designing of continuum soft robots with biomimetic mechanisms.
研究领域:
材料科学
·
机器人技术
·
生物力学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuezhen Feng,Chao Wang,Shibin Shang,He Liu,Xujuan Huang,Jianxin Jiang,Haibo Zhang
The development of stimulus-responsive materials with multifunctionality is important for achieving bionic artificial intelligence. However, stimulus-responsive cellulose hydrogels that simultaneously change their shape and fluorescent color under a single stimulus are difficult to fabricate. Here smart, multicolor fluorescent cellulose hydrogels were prepared from cellulose, levofloxacin, epichlorohydrin, and lanthanide ions (Eu 3+ or Tb 3+ ). The hydrogels were incorporated with pan paper into synergetic color-changing and shape-morphing actuators (Eu-CLF and Tb-CLF actuators). Besides fluorescing with the metal ligands, levofloxacin possesses antibacterial activity. The fluorescence color of Eu-CLF hydrogel in Tb 3+ solution changed from red to yellow, whereas that of Tb-CLF hydrogel in Eu 3+ solution changed from green to red. Both the Eu-CLF and Tb-CLF hydrogels fluoresced blue and green in alkali and acid solution, respectively. The actuator thus achieves synergetic color-changing and shape-morphing under a single external stimulus (acidic/alkaline switching). Such an activator shaped like a bionic flower and an intelligent octopus-type soft robot with camouflaging ability were then prepared. This study provides an elegant strategy for developing advanced multi-responsive multicolor tunable behaviors for bionic soft robots, biosensors , and camouflaged robots.
研究领域:
材料科学
·
仿生学
·
人工智能
·
机器人技术
·
生物传感器
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Jingyi Zhang,Yu Wang,Yuxi Sun,Shuaishuai Sun,Zhenbang Xu,Jun Li,Ji Li,Xinglong Gong
The soft actuators capable of responding to multiple stimuli and adapting to changing environments have attracted growing interest in the flexible multifunctional materials. However, how to achieve high degree of freedom (DoF), precise control, and complex shape transformation of the multi-stimuli responsive soft actuator, still remains challenging. Here, we report a multi-responsive soft actuator with various controllable sophisticated deformations by integrating a magnetically sensitive elastomer (MSE) with a liquid crystal elastomer (LCE). Through regulating the stimuli strength and the geometrical dimensions and material parameters of elastomers, the bending angle and curling curvature of the actuator are accurately controlled ranging from 0 to 58.9° and from 0.23 to 1.29 cm–1, respectively. The facile material-structural synergistic design drives the complex 3D shape deformations (e.g., bidirectional bending, shrinkage/bending, rolling/bending, and twisting/bending) of the actuator. More importantly, due to its photosensitive characteristics, the shape-morphing of the actuator can be manipulated locally and sequentially, which markedly enriches the DoFs. The flower-shaped actuator displays multiple deformation modes, and the hand-shaped actuator transforms between 8 gestures under the control of laser and magnetic field, proving that the multi-responsive soft actuators have great application potentials in future bioengineering, soft manipulators, and flexible electronics.
研究领域:
材料科学
·
机器人技术
·
生物医学工程
·
机械工程
·
软物质物理
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Hongzhi Feng,Xiwei Xu,Binbo Wang,Yi Su,Yanlin Liu,Chuanzhi Zhang,Jin Zhu,Songqi Ma
Recyclable carbon fiber reinforced polymer (CFRP) composites have attracted considerable attention in recent years due to the combined merits of excellent mechanical and thermal properties, recyclability and reprocessability. This paper reports on the successful preparation of closed-loop recyclable CFRP by in-situ polymerization and dynamic cross-linking (ISPDC) technology. The SEM, XPS and monofilament tensile curves were measured to investigate the morphology, chemical details, and mechanical properties of the recycled carbon fiber (CF); the chemical structure of the degraded resin was further characterized and analyzed according to the NMR and FTIR spectra. The obtained results show that under mild acidic conditions, the CFRP was degraded to high-quality recycled CF and linear polymer with methacrylic acid units, which can be used to prepare regenerated CFRP. In addition, due to the dynamic feature of the hemiacetal ester structure in the CFRP matrix, the CFRP also exhibited multiple functions, such as rapid welding, reprocessing, shape shifting, and self-healing, as well as the extremely long shelf life of composite prepregs . Our analysis of the recycling and dynamic exchange processes indicates that the strategy of embedding a releasable linker is dominant for the preparation of closed-loop recyclable and multifunctional CFRP.
研究领域:
材料科学
·
高分子化学
·
复合材料
✓ 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）