Nanoscale
·
2016
·Vol. 8
·期 41
·17881-17886
·
IF 7.76
Xiaogang Gu,Qingxia Fan,Feng Yang,Le Cai,Nan Zhang,Wenbin Zhou,Weiya Zhou,Sishen Xie
Hybrid hydro-responsive actuators are developed by infiltrating carbon nanotube yarns using poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate). These actuators demonstrate impressive rotation and contraction in response to water due to volumetric expansion of the helical arrangement of carbon nanotubes. The total torsional stroke is 3720 revolutions per m and the simultaneously generated contractive strain reaches 24% at a paddle-to-yarn mass ratio of 350. The contraction output can furthermore be significantly enhanced by constraining the rotational motion and it reaches 68% with an applied stress of 1 MPa. Additionally, hybrid yarns exhibit an approximately linear response to humidity changes and show extra capability of electrical actuation, which, combined with the excellent hydro-actuation performance, endow them with great potential for a variety of applications including artificial muscles, hydro-driven generators, moisture switches and microfluidic mixers.
研究领域:
材料科学
·
生物工程
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产品关联
DOI
PubMed
高影响因子
Nano Today
·
2024
·
IF 13.2
Zhen Huang,Penghao Sun,Fuhao Dong,Mujaheed Halliru Saad,He Liu,Xu Xu,Can Jin
Hydroplastic polymers have attracted much attention due to their good combination of hydroformability and environmental sustainability. However, the instability of the network structure of hydroplastic polymers constructed from a single non-covalent physical interaction makes it challenging to achieve satisfactory mechanical properties and hydroforming simultaneously. Herein, a cellulose hydroplastic polymer (Cel-hydroplastic) was proposed that is fabricated by constructing a dynamic dual cross-linking network (boronic ester and hydrogen bonds) between cellulose nanofibers (CNF) and synthetic copolymer containing a catechol structure (PHD). Notably, CNF promotes water-driven reorganization of the dynamic dual network, which allows Cel-hydroplastic to switch arbitrarily between 2D and 3D shapes. Meanwhile, introducing CNF enables Cel-hydroplastic with high mechanical strength (tensile strength: 128.30 MPa dry; 44.50 MPa at relative humidity 90 %). Furthermore, Cel-hydroplastic can be easily recycled and efficiently biodegraded in natural environments. Overall, these outstanding properties position Cel-hydroplastic as a promising candidate for the next generation of environmentally friendly materials.
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
Materials Today Bio
·
2022
·
IF 10.761
Hongjian Huang,Renfeng Xu,Peng Ni,Zhenghong Zhang,Caixia Sun,Huaying He,Xinyue Wang,Lidan Zhang,Ziyi Liang,Haiqing Liu
Tissue adhesive with on-demand detachment feature is critically important since it can minimize hurt to patient when it is stripped away. Herein, a water-driven noninvasively detachable wet tissue adhesive hydrogel (w-TAgel) was produced by UV-initiated radical copolymerization of N-isopropylacrylamide (NIPAM), acrylamide (AAm), gelatin methacrylate (GelMA), and urushiol. As a w-TAgel, its robust and tough mechanical property makes it suitable for dynamic wound tissue. The polyurushiol segments of it are crucial to the formation of tough adhesion interface with various wet tissues, while polyNIPAM units play an indispensable role in on-demand detachment via thermo-responsive swelling behavior because the hydrophobic aggregation among isopropyl groups is destroyed upon water treatment with temperature of 25 °C or less. Additionally, it exhibits multiple merits including good hemocompatibility, cytocompatibility as well as pro-coagulant activity and hemostasis. Therefore, our w-TAgel with strong adhesion and facile detachment is an advanced prospective dressing for wound closure and rapid hemostasis. The wet tissue adhesion and water-driven detachable mechanism may shed new light on the development of on-demand noninvasively detachable wet tissue adhesives.
研究领域:
生物材料学
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医学工程
·
组织工程
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产品关联
DOI
PubMed
高影响因子
Gels
·
2024
·Vol. 10
·期 4
·279
·
IF 5
Yang Liu,Mingjian Ma,Yuan Shen,Zhengdong Zhao,Xuefei Wang,Jiaqi Wang,Jiangbo Pan,Di Wang,Chengyu Wang,Jian Li
The use of environmentally friendly and non-toxic biomass-based interfacial solar water evaporators has been widely reported as a method for water purification in recent years. However, the poor stability of the water transport layer made from biomass materials and its susceptibility to deformation when exposed to harsh environments limit its practical application. To address this issue, water-driven recovery aerogel (PCS) was prepared by cross-linking epoxy-based polyhedral oligomeric silsesquioxane (EP-POSS) epoxy groups with chitosan (CS) amino groups. The results demonstrate that PCS exhibits excellent water-driven recovery performance, regaining its original volume within a very short time (1.9 s) after strong compression (ε > 80%). Moreover, PCS has a water absorption rate of 2.67 mm s−1and exhibits an excellent water absorption capacity of 22.09 g g−1even after ten cycles of absorption-removal. Furthermore, a photothermal evaporator (PCH) was prepared by loading the top layer with hydrothermally reacted tannins (HAs) and Zn2+complexes. The results indicate that PCH achieves an impressive evaporation rate of 1.89 kg m−2h−1under one sun illumination. Additionally, due to the antimicrobial properties of Zn2+, PCH shows inhibitory effects against Staphylococcus aureus and Escherichia coli, thereby extending the application of solar water evaporators to include antimicrobial purification in natural waters.
研究领域:
材料科学
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环境科学
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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
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Shuai Yang,Yang He,Jinsong Leng
We synthesized shape memory poly(aryl ether ketone) (PAEK) and grafted carboxylic acid pyridine zwitterions onto the main chains for fabricating the zwitterionic PAEK (ZPAEK) material. ZPAEK exhibited a Tg of around 120 °C, great thermal stability, and mechanical performances, and heat-triggered shape memory behaviors, including high shape recovery ratio (over 98.7%) and fixity ratio (over 98%). Besides, we improved the hydrophilicity of PAEK by incorporating carboxylic acid pyridine zwitterions, for the first time, achieving the exceptional water-actuated shape memory behaviors for PAEK at room temperature. Furthermore, the controllable reconfiguration behaviors were achieved through the interaction between carboxylic acid pyridine zwitterions and water molecules. For the sample of any temporary shape, after absorbing water, its previous original shape was eliminated, and the deformed temporary shape could be redefined as the “original” shape to construct an unprecedented shape memory cycle, never returning to the first original shape. Additionally, the excellent triple shape memory behaviors of sample were obtained after absorbing water. After the programmable shape fixation processes, the sample of temporary shape could recover to the original shape through the two stages: one was at 110 °C, and the other was at 140 °C. We did believe the water-actuated, reconfigurable, and triple shape memory ZPAEK could be an ideal substitute material for smart sensors and actuators.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Daiyao Jiang,Tingting Wei,Kai Li,Fei Wang,Xin Sun,Jie Zhao
In this study, novel mixed matrix membranes (MMMs) composed of MoO 3 /Poly (vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) with distinctive piezo-photocatalytic properties were prepared. The membranes were made from dopes containing a high ratio of MoO 3 to P(VDF-TrFE) (2:1 wt%/wt%) through a modified solvent evaporation method. The addition of MoO 3 particles significantly impacted the crystallization and self-polarization of the P(VDF-TrFE) matrix, leading to a substantial increase in total crystallinity from 46.4% to 88.9% and a transformation from α to β phase. The flow-induced piezoelectric potential created an internal electric field, enhancing the spatial separation of photogenerated carriers through the piezoelectric effect. Controlled water flow further promoted the spatial separation of carriers. The developed MMMs demonstrated a high Rhodamine B degradation rate, reaching 83.1% within 45 minutes and over 99% within 90 minutes under natural light conditions. The MoO 3 /P(VDF-TrFE) MMMs exhibit promising piezo-photocatalytic attributes and hold potential for diverse applications due to their unique combination of piezoelectric and photocatalytic properties.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Xinliang Liu,Jilong Mo,Wanhai Wu,Hainong Song,Shuangxi Nie
The generation of free radicals was enhanced by triboelectric pulsed direct-current during the organic pollutant degradation. The self-powered electrochemical system was constructed for enhancing 4-CP removal powered by a water-driven triboelectric nanogenerator (WD-TENG). The output of current, voltage, and power of WD-TENG were studied. The removal of 4-CP and its degradation mechanism were also discussed. The results shows that the formation of hydroxyl radicals (·OH) was improved by improving PMA(Mo 5+ ) conversion efficiency by the WD-TENG in the phosphomolybdic acid/H 2 O 2 (PMA/H 2 O 2 ) system, resulting the mineralizing the 4-CP via dichlorination and oxidation . The removal of 4-CP improved by 10% in 120 min in the WD-TENG powered electro-PMA/H 2 O 2 system. This study provides a promising methodology for improving the performance of self-powered electrochemical processes for the treatment of environmental pollution.
研究领域:
环境科学
·
电化学工程
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 7
·4215-4226
·
IF 5.2
Changchun Wang,Lei Wang,Zewu Zhang,Na Zhang,Yu-an Huang
Shape memory polymer (SMP) can store entropic energy during programming and release the energy as recovery. The released energy is determined by the recovery strain and the recovery stress. The low recovery stress of SMP limits its application. In this paper, shape memory nanocomposite fibers (SMNFs) prepared by wet spinning through a two-step orientating process show thermo-active and water-driven shape memory effect. Carbon nanotubes (CNTs) are uniformly dispersed in SMNF and aligned along the SMNF axis. SMNF with 13 wt% CNT has an average maximum recovery stress of ~160 MPa at 100°C, which is almost five times higher than that of a pure PVA fiber. The uniform distribution of the orientational CNTs in the SMNFs and the confinement effect of the CNTs confirmed by the increased relaxation time contribute to the increment of the recovery stress. Aligned CNTs impede the mobility of amorphous chains and increase the T g of SMNFs. The twisted SMNF can drive an object up to 25 times its own weight in water to rotate and lift. The rotational velocity of the twisted SMNF is sensitive to temperature. Water molecules acting as plasticizers greatly enhance the mobility of the PVA chains, and the SMNF in water releases the stored entropic energy at room temperature. The SMNF with high recovery stress demonstrates its potential for applications in the field of actuators and artificial muscles.
研究领域:
材料科学
·
纳米技术
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机械工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lingqi Quan,Zhiqi Wang,Yu Zhong,Yiqiang Wu,Hui Zhao,Yan Mi,Fangchao Cheng
The potential ability of photochromic hydrogel as smart response material is determined by its coloration and fading speed. However, it is still a huge challenge to improve both the coloration and fading speed simultaneously. This paper presents the successful development of robust hydrogels with fast photoresponse and water-driven ultra-fast fading speed through the implementation of a dual-network preparation strategy. In the dual-network hydrogel, sodium tungstate contributed to its discoloration and crosslink. The obtained hydrogel exhibited fast photochromic response within 20 s under visible light irradiation. In addition, the photochromic response was achieved in 30 s under actual sunlight irradiation. Particularly, rapid fading of photochromic hydrogels was achieved by applying deionized water while leaving it naturally for 90 s. Furthermore, the simulated house experiments showed that the use of this hydrogel as smart glass could decrease the indoor temperature by about 5 °C. The photochromic hydrogel in this paper possesses excellent reversible repeatability, flexibility and foldability, and it exhibits promising potential for use in flexible information storage devices, visual displays and artificial intelligence systems, smart windows and other applications.
研究领域:
材料科学
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光电技术
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Wenxin Wang,Jing Yang,Wei Li,Yongtao Yao,Yaqian Yan,Wenjing Wang,Ning Wang,Jinsong Leng
Shape memory materials draw much attention due to various promising potential applications. This work prepares a novel shape memory composite via grading photo-thermal curing method, which has not yet been reported. Expectedly, it merges advantages of epoxy-based shape memory polymer (EP) and polyvinyl alcohol-based shape memory polymer (PVA), which has applicable stiffness and multi-stimuli responsive performance. The unsatisfactory mechanical properties of most water-driven shape memory polymer (SMP) is expected to be solved by this fabrication strategy, so that the application range of water-driven SMP could be further extended. The synergistic plasticization of PVA and EP dominates water-driven shape memory behavior of this composite. Interestingly, its water-driven shape memory performance is able to be further improved by immersed in HCl/EtOH solution. The glassy-to-rubbery modulus ratio ( E′ g /E′ r ) of the PVA/EP-HCl/EtOH is about 650 after immersed in 0.1 mol/L HCl/EtOH for 6 h. In addition, this immersed method also can solve the post curing problem of such cationic photocuring. It is an easy, efficient, economical strategy for improving synergistic water-driven shape memory performance. Furthermore, this shape memory composite is expected to provide new perspective and practical approach to realize the intellectualization of underwater deployment and release structure.
研究领域:
材料科学
·
高分子科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Riting Huang,Furui He,Shujuan Yang,Keyang Mai,Shuntian Huang,Haifang Liu,Yuhong Feng,Gaobo Yu,Jiacheng Li
High quantum yield polysaccharide-based materials are significative for the dynamic anti-counterfeiting, while that are limited by weak fluorescence. However, natural polysaccharides with weak fluorescence are not suitable for anti-counterfeiting. Herein, alginate derivatives (SA-PBA) exhibiting aggregation-induced emission with high-quantum yields were synthesized by grafting phenylboronic acid (PBA) onto a sodium alginate (SA) chain. As the concentration increases, polymer assembly can be induced to form more compact soft colloidal aggregates, which enhances the fluorescence properties of alginate derivatives by introducing B ← N coordination bonds in the hydrophobic microregions. Interestingly, the clustered aggregates of SA-PBA can be dynamically controlled by pH, realizing the reversible adjustment of fluorescence. The corresponding mechanism is revealed by the combination of coarse-grained simulations and experiments. It is found that SA-PBA uses a hydrophobic driving force and hydrogen bond interaction to self-assemble in an aqueous solution and promote fluorescence emission. Moreover, the fluorescence quantum yield of SA-PBA can reach 14.4 % and can be reversibly altered by tuning soft colloidal microstructures. Therefore, a reversible information encryption system of SA-PBA is developed for anti-counterfeiting. This work shed some light on how to design novel anti-counterfeit materials based on natural polysaccharides and optimize the dynamic fluorescence conditions.
研究领域:
材料科学
·
化学
·
纳米技术
·
防伪技术
✓ 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）