Polymers
·
2021
·Vol. 13
·期 11
·1753
·
IF 4.329
Weixian Huo,Heng An,Shuquan Chang,Shengsheng Yang,Yin Huang,Xiaohong Zhang,Xiaodan Hu,Haiqian Zhang
Environment-responsive hydrogel actuators have attracted tremendous attention due to their intriguing properties. Gamma radiation has been considered as a green cross-linking process for hydrogel synthesis, as toxic cross-linking agents and initiators were not required. In this work, chitosan/agar/P(N-isopropyl acrylamide-co-acrylamide) (CS/agar/P(NIPAM-co-AM)) and CS/agar/Montmorillonite (MMT)/PNIPAM temperature-sensitive hydrogel bilayers were synthesized via gamma radiation at room temperature. The mechanical properties and temperature sensitivity of hydrogels under different agar content and irradiation doses were explored. The enhancement of the mechanical properties of the composite hydrogel can be attributed to the presence of agar and MMT. Due to the different temperature sensitivities provided by the two layers of hydrogel, they can move autonomously and act as a flexible gripper as the temperature changes. Thanks to the antibacterial properties of the hydrogel, their storage time and service life may be improved. The as prepared hydrogel bilayers have potential applications in control devices, soft robots, artificial muscles and other fields.Keywords:composite hydrogel;irradiation;bilayer;temperature-sensitive
研究领域:
材料科学
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生物医学工程
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机器人技术
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xuehua Chen,Chao Qin,Zicheng Zheng,Hanwen Chi,Zhizhen Ye,Liping Zhu
Gas sensors with good repeatability and controllable fabrication method are extremely desired for practical applications. Co-MOF-derived Co 3 O 4 is a promising gas-sensing material candidate because of its large surface area, ultrahigh porosities, and abundant oxygen defects. However, the advantages of Co-MOF precursor were limited by the traditional sensor fabrication methods. Moreover, the high resistance and poor surface activity of Co 3 O 4 resulted in low gas-sensing performance at room temperature (RT). To overcome these challenges, in-situ sensors based on Co 3 O 4 porous films with controlled nanoscale thickness were directly prepared on ceramic substrates by using Co-MOF films as precursors. To further improve the conductivity, SnO 2 catalytic overlayers were introduced on top of Co 3 O 4 sensors to construct SnO 2 /Co 3 O 4 bilayer sensors, which were promising for triethylamine (TEA) detection at RT. As a result, the optimized SnO 2 /Co 3 O 4 sensor exhibited a fast response/recovery rate (11 s/16 s), high selectivity, and a satisfactory sensitivity (150%) to TEA at RT. The enhanced gas-sensing performance could be attributed to the unique bilayer structures, improved conductivity, and synergistic effects of the SnO 2 catalytic overlayers and Co 3 O 4 sensing layers.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 2
·121
·
IF 2.891
Yue Su,Zhaoxin Geng,Weihao Fang,Xiaoqing Lv,Shicai Wang,Zhengtai Ma,Weihua Pei
Nanoimprint technology is powerful for fabricating nanostructures in a large area. However, expensive equipment, high cost, and complex process conditions hinder the application of nano-imprinting technology. Therefore, double-layer self-priming nanoimprint technology was proposed to fabricate ordered metal nanostructures uniformly on 4-inch soft and hard substrates without the aid of expensive instruments. Different nanostructure (gratings, nanoholes and nanoparticles) and different materials (metal and MoS2) were patterned, which shows wide application of double-layer self-priming nanoimprint technology. Moreover, by a double-layer system, the width and the height of metal can be adjusted through the photoresist thickness and developing condition, which provide a programmable way to fabricate different nanostructures using a single mold. The double-layer self-priming nanoimprint method can be applied in poor condition without equipment and be programmable in nanostructure parameters using a single mold, which reduces the cost of instruments and molds.Keywords:double-layer;nanoimprint;wafer-scale;nanostructure
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Peiyu Tan,Feifei Lu,Yuge Han
A dual-layer structure combining the properties of two polymers is demonstrated to be efficient in strengthening the mid-to-far infrared modulation. Prior to the assembly of bilayer devices, the infrared adjustment capability of single-layer devices poly(3,4-ethylenedioxythiophene) ( PEDOT )、poly(pyrrole) ( PPY ) and poly(aniline) ( PANI ) with different polymerization charges is scrutinized. The results exhibit that the optimal polymerization charge affording the highest reflectance variation is inconsistent between the mid-wavelength and long-wavelength bands in PEDOT and PPY devices. However, through the arrangement of deposition sequence and relative thickness of PEDOT and PPY coatings, a device with the reflectance contrast of 0.662 in the mid-wavelength and 0.281 in the long-wavelength bands was obtained utilizing a bilayer film PEDOT-0.2C/PPY-0.3C . Further FTIR and UV–Vis spectra show that the bilayer films are successfully formed and both polymers play a role in the electrochemical process . Different morphologies of bilayer films with reverse positions observed by SEM images account for the correlation between the infrared regulation performance and deposition sequence.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xilu Hong,Zong Lu,Yali Zhao,Luxi Lyu,Li Ding,Yanying Wei,Haihui Wang
As one of the green, renewable, and clean energy resources, hydrogen is widely developed and utilized throughout the world. Highly efficient membrane separation for hydrogen production is required to give promising gas permeance with enough H 2 selectivity. The membranes are desired to be produced in large-scale, fast and facile methods. Here we report for the first time a kind of freestanding MXene-ZIF-8 dual-layered membrane for hydrogen separation. Fast synthesis of such membranes is realized by combining electrophoretic deposition (EPD) and fast current-driven synthesis (FCDS), achieving the assemble of MXene layer and growth of ZIF-8 layer, respectively, overcoming the traditional time-consuming vacuum filtration methods and solvothermal synthesis . The MXene-ZIF-8 dual-layered membrane prepared within 20 min exhibits significantly improved gas separation performance, whose H 2 /CO 2 selectivity increases from 44 for the pristine MXene membrane to 77 with H 2 permeance of 5.97 × 10 −8 mol m −2 s −1 Pa −1 . This concept of structure design of membrane can also be extended to other dual-layered membranes, including various 2D nanosheet layers combined with different MOF layers.
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
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Kai Liu,Qingyi Zhang,Chengwei Wang,Lei Wang,Feng Chen
Organic–inorganic lead halide perovskite (MAPbX3, X = Cl, Br, I) single crystals exhibit superior optoelectrical and physical characteristics and have been developed in various optical and electrical applications. However, the poor stability against moisture and light remains the most critical demerit of perovskite materials. In this work, light- and waterproof MAPbBr3-MAPbBr3@PbBr(OH) core–shell single crystals were successfully synthesized by surface engineering-induced transformation from MAPbBr3 to MAPbBr3@PbBr(OH). In addition, an in situ electrode preparation method was developed to construct the Ag/MAPbBr3-MAPbBr3@PbBr(OH)/Ag structure during the crystal growing process. The thickness-adjustable MAPbBr3@PbBr(OH) shell can present dual shielding effects and not only sustains the MAPbBr3 single crystal core with the highest responsivity of 31 mA W1–, response time ∼47 ms, and a detection rate of 4.8 × 1011 Jones but also achieves the embedded MAPbBr3 nanocrystal with bright photoluminescence (quantum yield of 56.1%). Moreover, the similar MAPbCl3-MAPbBrnCl3–n@PbBr(OH) and MAPbI3-MAPbBrnI3–n@PbBr(OH) core–shell single crystals have been prepared, which also exhibit excellent photoresponsivity and high emission. This work provides an effective strategy for the fabrication of high-performance and environmentally stable photodetectors.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2024
·Vol. 17
·期 13
·4794-4802
·
IF 32.4
Zhengqiang Hu,Fengling Zhang,Feng Wu,Huirong Wang,Anbin Zhou,Yi Chen,Tianyang Xue,Renjie Chen,Li Li
In electrochemical devices, the electric double layer (EDL) theory posits that the potential difference of the Helmholtz layer significantly influences the activation energy and reaction rate of the electrochemical reaction, which determines the uniformity of metal ion deposition. In this work, we compare the differential capacitance of metal cationic sulfate, along with factors such as cost as well as safety, and Ce(SO4)2 is selected to adjust the EDL at the Zn anode/electrolyte interface. Molecular dynamics simulations show the formation of a more compressed diffuse layer with the help of Ce4+, resulting in a decreased potential difference of the Helmholtz layer, an improved Zn2+ deposition overpotential and a reduced Zn electrode corrosion rate. In situ XRD and Raman spectroscopy reveal that Zn2+ deposition is favored along the (002) crystal plane, and hydrogen evolution is hindered. The Ce4+ modified electrolyte enables a Zn anode with high coulombic efficiency (99.6%) over 600 cycles at 10 mA cm−2. The compressed EDL extends the lifespan of the Zn–Zn cell to 2500 hours at 5 mA cm−2 and stable cycling for 300 cycles at 20 mA cm−2 and 10 mA h cm−2. Assembling Zn full cells with high-loading cathodes shows enhanced long-term cycling performance. Our findings reveal the potential of using high-valence metal cations like Ce4+ to regulate the EDL and uniform Zn2+ deposition in ZIBs, which suggests a promising direction for developing electrolytes for practical ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 5
·4718-4726
·
IF 1.338
Li Peng,Zhang Weiguo,Yu Hongquan,Zheng Lianjie,Yang Liang,Liu Gang,Sheng Chenchen,Gui Haoran,Ni Shuo,Li Pengsheng,Shi Feng
The menisci are fibrocartilaginous tissues composed primarily of an interlacing network of collagen fibers with nanoscale diameter. Electrospinning is a suitable process of producing nanoscale fibers that mimic collagen fibers. In this study, a bilayered scaffold (group B), which consists
of a gelatin nanofiber mesh and a PLGA nanofiber mesh, has been fabricated through an electrospinning method. At the same time, we electrospun pure PLGA fibrous mesh (group A) and gelatin/PLGA composite fibrous mesh (group C) as control groups. In order to compare all scaffold morphologies,
the scaffolds were imaged by SEM and some parameters were measured and analyzed as following: Diameters of fibrils are from the smallest of less than average 0.14 μm for group C to the biggest of nearly average 0.38 μm for group B. The scaffolds pore diameters are from
average 4.9 μm for group A to average 11.2 μm for group B. Porosity rates show that the group B has the highest porosity rate at about 91%. The scaffolds’ properties were compared and analyzed, including hydrophilicity property (water contact angle) and mechanical
properties (tensile strength). The results of water contact angle showed the group B is the most hydrophil among the groups. The results of tensile strength showed the tensile strength of group C is the weakest among the groups. All the results showed significant differences between the groups.
Finally, in vitro, the meniscal cells derived from New Zealand white rabbits menisci were seeded in the scaffolds. We observed the cells proliferation behavior in the scaffolds. All above demonstrates that a bi-layered gelatin/PLGA scaffold reveals not only concurrent effects of mechanics
and cytocompatibility in a fibrous context, but also a promising scaffold for future meniscal repair strategies.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Hanhan Chen,Xiaobin Wang,Yi Liu,Tengfei Yang,Naitao Yang,Bo Meng,Xiaoyao Tan,Shaomin Liu
Despite many methods available to synthesize MOF membrane, the cost-effective synthesis with high reproducibility and scalability is still a challenge. We present here a homologous support-induced approach for the growth of ZIF membrane supported on the dual-layer ZnO–Al2O3 hollow fibers, which has the potential for applications at larger scales. The developed unique dual-layer hollow fibers consisting of a thin outer ZnO layer firmly attached onto an inner porous alumina substrate were realized through one-step co-extrusion/sintering technique. During the MOF membrane synthesis, ZnO can be used not only as the support, but also as the nucleation sites and growth centers for the ZIF-8 membrane formation. More importantly, ZnO can act as a transitional bridge to direct the membrane growth outward along the support and inward embedded into the support, which significantly improving the binding force between the support and MOF, thus bringing in the outstanding membrane stability. Permeation of single gas and separation of binary mixtures revealed that the prepared membranes were free of defects. The resultant ZIF-8 composite membrane exhibits good hydrogen separation performance and excellent reproducibility. This protocol can achieve an easy and large-scale synthesis. In addition to ZIF-8 membrane, ZIF-67 membrane was also successfully synthesized via this method, which may provide some general guidelines for the preparation of other MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Biomedical Materials
·
2017
·Vol. 13
·期 1
·015012
·
IF 2.469
Hang Yao,Junpei Kang,Weichang Li,Jian Liu,Renjian Xie,Yingjun Wang,Sa Liu,Dong-An Wang,Li Ren
Cartilage repairing grafts have been widely studied, and osteochondral replacement hydrogels have proven to be an excellent method in research and clinical fields. However, it has been difficult to simultaneously solve three main issues in osteochondral replacement preparation: surface lubrication, overall mechanical support and good simulations of cell regeneration. A novel integrated bilayered hydrogel osteochondral replacement was constructed by blending polyvinyl alcohol (PVA) and β-tricalcium phosphate (β-TCP) in this study. Separated nano-ball milling with ultrasound dispersion prepared β-TCP demonstrated suitable properties of tiny particle size, high purity and ideal distribution, improving the mechanical properties of the novel integrated hydrogel, and providing a cartilage-like lubrication effect and high biocompatibility, including cytocompatibility and osteogenesis. The reinforcement of β-TCP and integrated molding technology enabled the hydrogel to demonstrate excellent component compatibility and good bonding between the two layers, which promoted the strengthening of the compression modulus and tensile modulus up to three times by mechanical testing. The surface lubrication properties of the novel osteochondral hydrogel were similar to the natural cartilage by friction coefficient characterization. The two layers of the novel integrated graft provided a considerable bio-function by co-culturing with chondrocytes and synovium mesenchymal stem cells: chondrocytes promoted adherence achieved by the upper density layer and better osteogenesis performance of the porous lower layer. The design of the bilayered β-TCP/PVA osteochondral hydrogel is promising for use in articular cartilage repair.
研究领域:
生物材料学
·
再生医学
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
Device
·
2024
·
IF 0
Huping Yan,Ronghui Qi,Zhen Liu,Han Wang,Chuanshuai Dong,Li-zhi Zhang
Ambient moisture-enabled generators (MEGs) present significant potential but suffer from low efficiency. This study explored the synergistic enhancement of an electrical double layer (EDL) at the hydrogel-electrode interface in hydrogel-based MEGs, which improves directional ion movement to achieve excellent performance. Our MEGs feature asymmetric electrodes made of carbon nanotubes and a poly(acrylamide-co-acrylic acid) hydrogel as the conductive medium. The interaction between the COOH-rich hygroscopic hydrogel and the salt-doped upper electrode established a humidity gradient within the hydrogel and a strong interfacial EDL. Results indicate that the generator (1 × 1 cm 2 ) achieved an open-circuit voltage of 1.3 V, an instantaneous short-circuit current of 55.7 μA/cm 2 , and a usable power output of 2.34 μW/cm 2 . It also exhibited robust environmental adaptability, maintaining 0.8 V below 30% relative humidity (RH) and over 0.65 V between −10°C and 60°C. Unlocking the potential of EDLs significantly enhances MEG performance, broadening application prospects in distributed self-powered devices and large-scale moisture-to-energy generation.
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
DOI
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Binbin Zhang,Xu Liu,Tianrong Zhan,Baorong Hou
To address the functional failure caused by low-surface-tension liquid wetting and adhesion in superhydrophobic materials, in this study, we constructed a bilayer coating with superamphiphobic properties using an epoxy (Ep) bonding layer and an organosilane-grafted attapulgite (OG-ATP) layer through spray-coating technique. The prepared superamphiphobic bilayer coating exhibited high contact angles (CAs) and low sliding angles (SAs) for cold water (25 °C), hot water (85 °C), glycerol, ethylene glycol, peanut oil, and even n-hexadecane (CA = 150.4 ± 0.3° and SA = 7 ± 2°) with surface tension of 27.5 mN m −1 . Surface morphology and elemental analysis confirmed the coating's unique micro-nano hierarchical structure and low surface energy characteristics. Electrochemical impedance spectroscopy (EIS) results showed that the surface charge transfer resistance ( R ct ) and low-frequency modulus (|Z| 0.01Hz ) were enhanced by 6–7 orders of magnitude compared to the bare aluminum alloy substrate. The anti-corrosion performance remained stable even after 5 days of 3.5 wt% NaCl immersion. Additionally, icing experiments with water droplets at −10 °C and −15 °C revealed a significant delay in ice formation on the substrate protected by the bilayer coating. The development of this protective material, combining superamphiphobicity, self-cleaning, corrosion resistance, and anti-icing functions, will provide advanced technological reserves in areas such as marine, aviation, transportation, and manufacturing.
研究领域:
材料科学
·
表面工程
✓ 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）