CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Linze Jin,Xu Han,Junxiu Piao,Yuhui Meng,Xiaoran Yang,Lifu Zhang,Zitian Zhang,Chengming Jiang,Sheng Bi
In recent years, smart shape memory materials have garnered significant attention for their potential applications in flexible electronics. However, the exploration of wood, a natural polymer with shape memory capabilities, has been limited, particularly concerning its editable and controllable memory shapes and moveable functions. This study presents a shape memory wood actuator (SMWA) with dual activation capabilities through water and heat. The SMWA is developed by connecting the treated wood with PDMS and LCE for consecutive gesture programming. The controlled contraction of LCE upon thermal activation, combined with strength changes due to reversible hydrogen bonding in the cellulose amorphous region during water activation, enables the SMWA to exhibit continuous shape memory capabilities and programmability. Additionally, the SMWA demonstrates satisfactory mechanical performance (tensile strength of 17.3 MPa when dry and 4.4 MPa when wet) and shape recovery capabilities (over 80 % shape recovery). Notably, the rigidity/flexibility change of SMWA under water-activated conditions, coupled with heat-activated posture control and memory through built-in circuits, allows for practical applications such as object grasping. Such efficient strategy offers a guideline for developing high- performance smart wooden shape memory materials, with promising prospects for applications in soft robotics, flexible sensors and oil–water separation.
研究领域:
材料科学
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智能材料
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Mingxing Li,Xiaolan Liang,Peiying Xie,Chunzhi Zhang,Yunhua Chen,Chaoyang Wang,Li Zhou,Tao Wang,Hongxia Liu
Solar-powered interfacial evaporation is a developing and sustainable technique increasingly utilized in desalination and wastewater purification. This technology involves the creation of cellulose nanofiber (CNF)/polylactic acid (PLA) composite aerogels through the Pickering emulsion approach. Self-floating aero-hydrogel ( E -VGP) with a hierarchical porous structure was formed on a viscous mixture containing polyvinyl alcohol (PVA), peach gum polysaccharide (PGP), and polypyrrole (PPy) via an in-situ polymerization process. Furthermore, by modifying the hydrolysis time of PGP with a hyperbranched polyhydroxy structure, VGP hybrid hydrogels of varying microscopic molecular sizes were produced. Additionally, solar vapor generators (SVG) with diverse macroscopic structures were fabricated using molds. The V8G4-12hP0.2 hybrid hydrogel, synthesized using PGP hydrolyzed for 12 h, exhibited an evaporation enthalpy of water at 1204 J g −1 . This capacity effectively activates water and enables low enthalpy evaporation. Conversely, the macrostructural design allows the cylindrical rod raised sundial-shaped structure of SVG3 to possess an expanded evaporation area, minimize energy loss, and even harness additional energy from its nonradiative side. Consequently, this micro-macrostructural design enables SVG3 to attain an exceptionally high evaporation rate of 3.13 kg m −2 h −1 under 1 Sun exposure. Moreover, SVG3 demonstrates robust water purification abilities, suggesting significant potential for application in both desalination and industrial wastewater treatment.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Huilong Guo,Wanting Dai,Ying Miao,Yongzhou Wang,Dong Ma,Wei Xue
In this work, liquid crystalline (LC) monomer with two n-decenoyl terminated groups was synthesized and applied into shape memory hydrogels containing main-chain LC unit by Michael addition polymerization. The liquid crystalline textures of LC monomer and hydrogels were determined by polarized optical microscopy. Thermal and water activated shape memory properties were investigated. And the shape memory properties were improved by incorporating main chain LC unit into hydrogels. The biocompatibility was evaluated by the cytotoxicity test and all these hydrogels illustrated no cytotoxicity. The good biocompatibility and reinforced shape memory properties with shape fixity ratio higher than 96% and shape recovery ratio higher than 93%, indicating a new idea to prepare shape memory hydrogels by introducing main-chain mesogenic units into hydrogels in the safe application of smart biomedical areas. Finally, water-activated actuators were prepared and could change themselves into “C” or “S” shape in water at 25 °C with about 20 min. And through in vitro heparin release of hydrogel and actuator investigation, more sustained heparin release performance of actuator was observed in our study. This indicated that the heparin loaded actuator would have potential application in anticoagulant scaffold by combining the sustained heparin delivery character and the shape self-changing character of water-activated actuators.
研究领域:
材料科学
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生物医学工程
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药剂学
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 33
·2405511
·
IF 27.4
Le Yao,Xue Peng,He Zhu,Qi Zhang,Shiping Zhu
In adhesive industry, tapes are renowned for their superior flexibility, repeatability, and ease of storage compared to glues. However, conventional adhesive tapes often suffer from low adhesion strength (<500 kPa). This work introduces an innovative adhesive tape composed of an amphiphilic copolymer and a hydrophobic ionic liquid, achieving an ultrahigh adhesion strength of up to 3.1 MPa on various substrates, making a record-high strength to date for tape-type adhesives. This exceptional adhesion performance is facilitated by water droplets applied at the bonding interface, transforming the adhesive surface into a glue-like property without the need for curing treatments or additional auxiliary equipment. By combining the advantageous features of both glues and tapes, these adhesives are termed as transient semi-glue tapes (TSGT). The mechanism behind such water activation and self-locking process is elucidated, and a general preparation approach is developed. Furthermore, the repeatability and recyclability of TSGT are demonstrated, offering an ingenious solution to this long-standing engineering challenge.
研究领域:
材料科学
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粘合技术
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聚合物化学
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表面工程
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DOI
高影响因子
BIOMACROMOLECULES
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2025
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IF 5.4
Hongjian Huang,Zongxuan Huang,Shuichang Chen,Xiaoyu Yang,Hu Zhao,Qinhui Chen,Haiqing Liu
Traditional suturing and stapling demand surgical skill and risk additional trauma, whereas conventional tissue adhesives falter on wet surfaces. Inspired by cement curing, a water-activated bioadhesive powder (WABP) was developed in this work. WABP was a mixture of tannic acid-terminated poly(lipoic acid) (TA-PLA) and arginine (Arg), in which the TA-PLA was synthesized through the Michael addition reaction of PLA containing disulfide radicals with TA possessing a radical quenching effect. Upon hydration, the powder swiftly formed a self-assembled coacervate adhesive, which exhibited antiswelling properties in underwater environments, a result of the combined effects of hydrogen bonding, electrostatic interactions, and hydrophobic associations. The WABP, harnessing the attributes of both powder and coacervate adhesives, was adept at conforming to an irregular wound shape and delivered stable bioadhesive performance. It demonstrated superior wound healing capabilities, antibacterial properties, favorable cytocompatibility, and histocompatibility. This supramolecular WABP offers a simple, multifunctional alternative to sutures for biomedical applications.
研究领域:
生物医学工程
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材料科学
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组织工程
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伤口护理
·
超分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）