ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Han-Xiao Wang,Xin-Yu Zhao,Jin-Qiang Jiang,Zhao-Tie Liu,Zhong-Wen Liu,Guo Li
Thermal-responsive hydrogel actuators have aroused a wide scope of research interest and have been extensively studied. However, their actuating behaviors are usually monotonous due to their unchangeable shapes and structures. Here, we report thermal-responsive poly(isopropylacrylamide-co-2-(dimethylamino)ethyl methacrylate)/alginate hydrogels with programmable external shapes and internal actuating trajectories. The volume phase transition temperatures of the resulting hydrogels can be tuned in a wide temperature range from 32 to above 50 °C by adjusting the monomer composition. While the formation and photo-dissociation of Fe3+–carboxylate tri-coordinates within the entire hydrogel network enable photo-responsive shape memory property, the insufficient dissociation of the tri-coordinates along the irradiation path gives rise to gradient crosslinking for realizing thermal-responsive actuation. Controlling the evolution of the gradient structure facilitates the regulation of the actuating amplitude. Furthermore, we show that the combination of these two types of shape-changing functionalities leads to more flexible and intricate shape-changing behaviors. One interesting application, a programmable hook with changeable actuating behaviors for lifting different objects with specific shapes, is also demonstrated. The proposed strategy can be extended to other types of actuating hydrogels with more advanced actuating behaviors.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Xiaoshuan Pan,Xiaofei Li,Chao Xiao,Xin Ding,Kang Zheng,Xianglan Liu,Meng Xue,Lin Chen,Yi Gong,Xingyou Tian,Xian Zhang
With the development of dynamic infrared camouflage technology, photothermal infrared camouflage has attracted researchers' attention due to its remote-control capability and fast response speed. However, lots of photothermal fillers for high temperatures will break the flexibility and transparency of the polymer. In this work, transparent photothermal infrared camouflage liquid metal microspheres/colorless polyimide (LM/CPI) films with light programming were fabricated. The polydopamine-coated LM microspheres endow CPI with excellent photothermal effect, achieving a wide range of infrared camouflage from room temperature to 390 °C. Furthermore, the glass transition, residual stress, and the different thermal expansion coefficients endow the LM/CPI film with light programming and light actuation capability. The LM/CPI film can mimic the bending of an arm and the opening and closing of a hook. Combining the light programming capability with the dynamic infrared camouflage ability of the LM/CPI film proposes an infrared camouflage strategy where the position of the camouflage film is changed through light programming while conducting infrared camouflage, thereby targeting the design of deceptive, false targets or altering the camouflaged area. Therefore, the LM/CPI films open up a new strategy for dynamic infrared camouflage, sketching a promising future for them in dynamic infrared camouflage.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qiuyu Chen,Jinhui Huang,Xinran Feng,Hui Xie,Shaobing Zhou
Biomimicking aquatic organisms offers many opportunities for designing intelligent robots that can freely move on water. However, most works were focused on multilayered materials or assembled structures and faced limitations in stability, versatility, and motion navigation. Here, we develop an assembly-free water-strider-like aquatic robot using a single layer of light-programmable liquid-crystal elastomer (LCE) that could be used to create asymmetric structures. The LCE strider mimics both the shape and functions of natural water striders; it is designed with four legs, with the fore and hind legs being programmed respectively via light. Consequently, the LCE strider shows self-oscillation and self-propulsion behaviors on low-grade thermal water with a temperature gradient at the air–water interface, owing to unbalanced changes in the contact areas and tensions between the legs and water. Furthermore, the trajectories of the LCE strider are manipulated by NIR light after selectively depositing polydopamine with photothermal conversion. In this way, path navigation is realized, that is, moving straight and on-demand turning, similar to the movement of natural water striders. This study should inspire the development of soft intelligent robots using shape-morphing materials.
研究领域:
材料科学
·
仿生学
·
智能机器人
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DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 12
·期 2
·2201565
·
IF 11.092
Zhekun Zhang,Juning Xie,Jun Xing,Changhao Li,Tak Man Wong,Hui Yu,Yuanxing Li,Fabang Yang,Yu Tian,Huan Zhang,Wei Li,Chengyun Ning,Xiaolan Wang,Peng Yu
Developing an ideal wound dressing that not only accelerates wound healing but also eliminates potential bacterial infections remains a difficult balancing act. This work reports the design of a light-programmable sodium alginate nanocomposite hydrogel loaded with BiOCl/polypyrrole (BOC/PPy) nanosheets for state-switchable wound healing promotion and bacterial infection elimination remotely. The nanocomposite hydrogel possesses programmable photoelectric or photothermal conversion due to the expanded light absorption range, optimized electron transmission interface, promoted photo-generated charge separation, and transfer of the BOC/PPy nanosheets. Under white light irradiation state, the nanocomposite hydrogel induces human umbilical vein endothelial cells migration and angiogenesis, and accelerates the healing efficiency of mouse skin in vivo. Under near-infrared light irradiation state, the nanocomposite hydrogel presents superior antibacterial capability in vitro, and reaches an antibacterial rate of 99.1% for Staphylococcus aureus infected skin wound in vivo. This light-programmable nanocomposite hydrogel provides an on-demand resolution of biological state-switching to balance wound healing and elimination of bacterial infection.
研究领域:
生物材料学
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医学工程
·
纳米医学
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Yaxin Qiu,Dheeman-Roy Munna,Fang Wang,Juqun Xi,Zhifeng Wang,Defeng Wu
For shape-memory polymers (SMPs), introducing material heterogeneity is vital to tailor shape-shifting pathways. However, it is hard to reprogram the heterogeneity for both covalent networks and dynamic covalent networks after these networks are encoded. Here, photoactive coumarin derivative end-capped dangling chains were used to participate in building photoreversible polycaprolactone/poly(malic acid) networks, endowing the networks with reprogrammable heterogeneity and a capability of room-temperature storage of entropic energy. The alternations of network topology with 365/254 nm UV irradiation and strain-induced crystallization behavior of as-prepared bio-based elastomers were studied, aiming at quantitatively guiding the spatiotemporal release of entropic energy to regulate asynchronous deformations. This work provides applicable methods for simplifying shaping manipulation or for diversifying shape-shifting pathways of SMPs.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 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）