CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiahao Zhang,Shengyu Bai,Zhongqi Li,Guanyao Gu,Hucheng Wang,Lai Wei,Xun Sun,Fuzhen Xuan,Xuhong Guo,Yiming Wang
Poly( N -isopropylacrylamide) (PNIPAm) is widely used for smart materials and devices owing to its thermoresponsiveness. Here we demonstrate how PNIPAm can be geared to show reversible phase transition in response to light rather than temperature through a simple signal transformation strategy. This strategy does not require the polymer to be tediously modified with any photoresponsive moieties, offering a new approach towards remote-controlled smart objects. Our concept is achieved using a photoacid and simple PNIPAm-based copolymers. Upon switching on/off light, the photoacid releases/captures a chemical signal which can reversibly change the lower critical solution temperature (LCST) of the copolymers, thereby resulting in a fast (<0.5 min) and reversible phase transition of the copolymer without changing the ambient temperature. Thereon, a series of light-controlled dynamic patterns and conceptually smart soft actuators composed of the copolymers are fabricated. Such a signal transformation strategy enabling PNIPAm photoresponsiveness may boost the development of new non-contact smart objects with adaptive responsiveness.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 3
·2100778
·
IF 4.402
Xiaofei Wang,Yang He,Jinsong Leng
The combination of shape memory effects and multi-functionalities in smart materials is becoming one of the hottest research directions in the field of actuators and robotics. In this study, N -hydroxyethyl-3,3-dimethyl-6-nitroindoline spiropyran (SP) is chemically grafted into a polyurethane matrix to prepare ultraviolet light-actuated shape memory thermoplastic polyurethane, which first integrates three unique properties including shape memory, photochromism, and mechanochromism. The FTIR, WAXD, SAXS, DSC, TGA, and shape memory tests reveal that the shape memory transformation temperature of 4.6 wt% SP-based shape memory polyurethane is 41.2 °C, and it has the highest shape memory performance, as indicated by shape fixation and shape recovery ratios of 97.4% and 93.7%, respectively. Furthermore, “bionic fingers” with diversely selective actuation properties are fabricated, which exhibit a series of programmable multi-segment motions to meet potential applications in the field of soft actuators.
研究领域:
材料科学
·
智能材料
·
机器人学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Xiaowen Wang,Yingnan Gao,Changyou Liu,Yaping Wang,Anqin Liu,Wenguang Yang
Robots have a profound impact on human production and life, which have been developed by leaps and bounds in recent decades. As the higher and higher requirements for operations in complex environments, researchers continue to develop wireless driven miniature robots. In this paper, the ratio and deformation properties of PNIPAM and PEGDA hydrogels were researched, and the microcrawls and microgrippers with 3D structure were prepared through secondary curing technology. They have light stimulus response and magnetic response characteristics, and can be reversibly transformed from 3D to 2D structure to complete crawling and transportation functions. This research offers a reference for the fabrication and programmable actuation of intelligent materials. It holds certain promise in the domains of transportation and bionics.
研究领域:
材料科学
·
仿生学
·
机器人技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Intelligent Systems
·
2021
·Vol. 3
·期 10
·2000232
·
IF 0
Qianying Chen,Tian-Yun Huang,Pengyu Lv,Jianyong Huang,Huiling Duan
Intelligent micromachines that perform tasks in complex microenvironments by adjusting structural configurations and physical properties offer substantial potential for use in many fields, including precision medicine, microfluidic channels, micromanipulations, and bioengineering. Recent progress in smart materials and 4D microprinting provides a feasible strategy for fabricating compound micromachines by designing and assembling predictable 3D-to-3D shape-morphing components. However, shape transformations of these components can only be triggered simultaneously by external stimuli, and orderly triggering among them cannot be achieved yet for an intended purpose of performing more efficient actions. Herein, a novel sequentially triggered strategy is proposed for developing intelligent micromachines that consist of multiple reconfigurable components that work interactively with each other. Furthermore, self-locking micromachines with tunable coupling mechanisms that coordinate accurate time-sequence deformations among components are achieved. Three types of locking couplings are modulated based on finite-element analysis (FEA)-aided design. The proposed method provides an effective strategy to create next-generation intelligent micromachines that can change their shapes to adapt to complex situations and complete multiple tasks.
研究领域:
生物工程
·
精密医学
·
微流控技术
✓ 已验证
产品关联
DOI
Coatings
·
2022
·Vol. 12
·期 11
·1729
·
IF 3.236
Cong-Cong Luan,Yu-Ping Zhang,Cheng-Xing Cui,De-Liang Chen,Yuan Chen,Meng-Jun Chen
In this paper, a novel pH-responsive brass mesh modified by 3-mercaptobenzoic acid (MBA) and 2-naphthalenethiol (NPT) was demonstrated via a facile chemical etching method followed by surface modification. The smart wettability was dependent on the assembled MBA and NPT with suitable thiol proportions. The on–off control of water penetrating intelligently into the nanostructured brass mesh substrate was carried out by the pH change in the outside environment. The brass mesh modified with XNPT= 0.4 (mole fraction of NBT in the mixed solution) exhibited the strongest pH responsivity from superhydrophobicity to superhydrophilicity. Furthermore, the resulted Janus membrane (JM) fabricated by the integration of a smart brass mesh and hydrophobic Ni foam could be used as a water diode in air and liquid systems. Unidirectional penetration for the water droplet was realized by the resulting smart JM with a hydrophobic upper layer and a pH-responsive layer below.Keywords:smart material;brass mesh;3-mercaptobenzoic acid;2-naphthalenethiol;Janus membrane
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 42
·2302656
·
IF 13.3
Jingang Wang,Yuzhao Zhang,Jianchen Zheng,Xiubao Zhao,Hongji Guo,Ye Qiu,Xiaoduo Wang,Lianqing Liu,Haibo Yu
An active heterostructure with smart-response material used as “muscle” and inactive material as “skeleton” can deform over time to respond to external stimuli. 4D printing integrated with two-photon polymerization technology and smart material allows the material or characteristic distribution of active heterostructures to be defined directly at the microscale, providing a huge programmable space. However, the high degree of design freedom and the microscale pose a challenge to the construction of micromachines with customized shape morphing. Here, a reverse design strategy based on multi-material stepwise 4D printing is proposed to guide the structural design of biomimetic micromachines. Inspired by the piecewise constant curvature model of soft robot, a reverse design algorithm based on the Timoshenko model is developed. The algorithm can approximate 2D features to a constant-curvature model and determine an acceptable material distribution within the explored printing range. Three Chinese “Long” (Chinese dragon heralds of good fortune) designed by the strategy can deform to the customized shape. In addition, a microcrawler printed using this method can imitate a real inchworm gait. These results demonstrate that this method can be an efficient tool for the action or shape design of bionic soft microrobots or micromachines with predetermined functions.
研究领域:
材料科学
·
生物仿生学
·
微纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Yuheng Xu,Zedong Zhang,Xiangfei Geng,Jing Jin,Muzaffar Iqbal,Aijuan Han,Bin Ding,Junfeng Liu
The adsorption and recovery of crude-oil from oily water using oil-selective adsorbents is a highly promising solution for the increasing worldwide oil pollution, but remain a challenge. Herein, we reported a carbon foam (CF) with switchable wettability as smart materials for fast oil adsorption and recovery. By grafting poly(4-vinylpyridine) (P4VP) onto the surface of CF, the obtained smart foam presented a pH responsiveness and could change superhydrophilic and superhydrophobic surface according to the pH value. Thus, the smart responsive carbon foam could fast adsorb the oil in neutral solution (pH = 7) with high oil adsorption capacity of 62–120 g g −1 and desorb all the adsorbed oil in acidic solution (pH = 1) within 1.5 min. In addition, only 3% loss was observed for oil (chloroform) adsorption and recovery after successive reuses of up to 15 cycles, which demonstrated great recyclability of the materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Pengchang Liu,Hua Lai,Xin Luo,Qixing Xia,Dongjie Zhang,Zhongjun Cheng,Yuyan Liu,Lei Jiang
Recently, smart liquid permeation has aroused much attention. However, existing strategies to achieve such a goal are often based on reversibly controlling hydrophobicity/hydrophilicity on static porous structures, which are unsuitable for oils with low surface tension, and meanwhile they cannot realize tunable permeation flux since the pore sizes are constant. Herein, we report a superlyophilic shape memory porous sponge (SSMS) that can demonstrate tunable pore size from about 28 nm to 900 μm as the material’s shape is changed. Based on the controllability in pore size, not only ON/OFF penetration but also precisely tunable permeation flux can be obtained for both water and oil. Furthermore, by using the SSMS, an application in accurate release of small-molecule rhodamine B was also demonstrated. This work reports a material with tunable pore size for controllable liquid permeation, which provides some ideas for designing smart superwetting permeation materials.
研究领域:
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 23
·期 2
·2000983
·
IF 3.217
Mengnan Qu,Lulu Liu,Xin Yang,Chen Yang,Jiehui Li,Qian Liu,Lei Peng,Xiangrong Liu,Jinmei He
Nowadays, oily wastewater seriously endangers human health and living environment. Intelligent materials with switchable wettability gear up the broad application prospect in controllable oil/water separation and have received extensive attention. Herein, a simple and novel fluoride-free method for preparing pH-responsive super-wetting material by monomer polymerization is reported. Surprisingly, the as-prepared smart material can produce reversible wettability changes between superhydrophobicity/superoleophilicity and superhydrophilicity/underwater superoleophobicity by adjusting various pH values. Based on this fresh phenomenon, it can be used to separate various oil/water mixtures on-demand with high separation performance. It is worth noting that the smart fabric also separates mixtures of highly corrosive liquids and oils. Moreover, the smart fabric also has excellent self-cleaning and low surface adhesion. In addition, it also shows excellent mechanical and chemical stability under harsh conditions. All these advantages show that the smart fabric can play a vital function in solving the related severe conditions of marine oil pollution and industrial wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 36
·5520-5527
·
IF 5.047
Lunqiang Jin,Zhenqiang Shi,Xiang Zhang,Xiaoling Liu,Huiling Li,Jingxia Wang,Feng Liang,Weifeng Zhao,Changsheng Zhao
The prevention of bacteria-induced infections has been increasing in importance in both clinical surgery and biomedical engineering. Although great attention has been paid to designing intelligent antibacterial surfaces, the fabrication processes are still not facile and universal enough, and the antibacterial efficiencies of these surfaces are also not ideal. Herein, ionic liquid (IL) molecules of 3-(12-mercaptododecyl)-1-methyl-1H-imidazol-3-ium bromide (IL(Br)) were synthesized with the minimum inhibitory concentrations as low as 4 and 8 μg mL−1 against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), respectively. By simply immersing a polymeric substrate into the IL(Br) solution, an antibacterial surface with high killing efficiency of 99% against S. aureus (94% against E. coli) was achieved via a mussel-inspired approach. Subsequently, 97% S. aureus and 95% E. coli on the substrate could be released by simple ion-exchange of Br− with (CF3SO2)2N− due to the ion sensitivity of the IL molecular brushes. Thus, the proposed facile strategy towards a superior efficiency surface could be potentially used in intelligent antibacterial fields.
研究领域:
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 1
·59-65
·
IF 1.754
Yang Zhenglong,Fu Kangyu,Yu Jing,Liu Xinyan
The organic/inorganic hybrid material of poly[2-(dimethyl amino)-ethyl methacrylate]/polyhedral oligomeric silsesquioxane (POSS–PDMAEMA) was synthesized via a thiol-Michael addition reaction. The structures of POSS–PDMAEMA and its self-assembly in aqueous solution were confirmed by 1 H-NMR, TEM, DLS, UV–Vis and fluorescence spectrum. In aqueous solutions, POSS–PDMAEMA could self-assemble into micelles and its critical micelle concentration was 12.4 mg/L. POSS–PDMAEMA micelles can adsorb dyes efficiently, it could adsorb methyl red at a concentration of 10–100 mg/L and dithizone at a concentration of 20–100 mg/L, and could remove 98% methyl red and 90% dithizone within 30 s. Due to the good temperature and pH responsiveness, POSS–PDMAEMA micelles could release organic dye absorbed into the organic solution again when the solution was heated to 40 °C or pH value of the solution was adjusted to 4.0. It suggested that POSS–PDMAEMA can be utilized as an interesting “smart” materials for absorption of organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wenjie Zhang,Penghui Wang,Yi Hu,Qiang Chen,Bo Chi
Natural materials possess inherent multilength-scale structures, showcasing outstanding mechanical properties such as strain-stiffening, high damping, and shape-memory features under ambient conditions. Such integrated properties are highly desirable for advanced materials in biomedical devices and soft robots but remain challenging in synthetic materials. Herein, a novel strategy of sequential ion treatment is employed to introduce micro/nanoscale-ordered structures and molecular-scale stimulus responses into hydrogel-derived self-assembly fibers under ambient conditions. The treated fibers exhibit strain-stiffening properties with a high toughness of 257 MJ m −3 and 73% damping capacity comparable to spider silk. Owing to their cross-linking network and reversible secondary structure, those fibers exhibit outstanding water-stability, wet stretchability, and hydration-responsive shape-memory performance, with ultimate elongation of 407%, shape-fixity ratio of 94%, and shape-recovery rate of 97%. This work furthers the green fabrication of smart materials with multifunction and presents promising applications in diverse fields, including biomimetics and biomedicine.
研究领域:
材料科学
·
生物医学工程
·
仿生学
✓ 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）