INORGANIC CHEMISTRY
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2024
·
IF 4.3
Yuhao Che,Wenhui Li,Chunqi Wang,Xuemin Zhang,Zilei Guo,Aziz Bakhtiyarovich Ibragimov,Junkuo Gao
The development of materials with superior thermal insulation and flame retardancy is critical for industrial applications and daily life. Metal–organic framework (MOF)@poly(vinyl alcohol) (PVA) (MOF@PVA) aerogel composites have demonstrated remarkable thermal insulation and flame retardancy properties. In this work, MIL-53(Al) was directly mixed with PVA and formed by freeze-drying, and the influence of the pore structure on the thermal insulation and flame retardancy properties of the materials was investigated. The incorporated MIL-53(Al) nanoparticles introduced abundant micro- and mesopores, enhancing the complexity of the pore structure and improving the thermal insulation and flame retardancy properties of the aerogels. The directionally freeze-cast aerogel achieved a thermal conductivity of 0.040 W·mK–1, and maintained excellent thermal insulation ability even at 220 °C. Furthermore, the aerogel exhibited nonflammable and self-extinguishing characteristics. This environmentally friendly manufacturing method provides new ideas for the design of MOF-based composites, thereby expanding their application areas.
研究领域:
材料科学
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化学工程
·
热能工程
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DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
·
IF 3.571
Yang Qin,Jinpeng Wang,Chao Qiu,Xueming Xu,Zhengyu Jin
Most conventional synthetic hydrogels suffer from poor mechanical properties; despite recent significant progress in fabricating tough hydrogels, it is still a challenge to simultaneously realize high stretchability, self-recovery, and self-healing capability in a hydrogel. In this work, a new type of starch/PVA/borax hybrid dual cross-linked (DC) hydrogel was synthesized by a one-pot method. The as-prepared DC hydrogels exhibited mechanical properties of remarkable extensibility (ca. 2485%), excellent toughness (ca. 290.5 kJ m–3), high compression strength (ca. 547.8 kPa), rapid recoverability (81.9% energy recovery after 30 min), and free-shapeable behavior. More impressively, the DC gels sustained approximately 300 times their own weight and exhibited an outstanding self-healing capability at room temperature both in air and underwater. Furthermore, the adsorption amount of methylene blue onto the anionic DC gel (144.68 mg/g) was much higher than that of corn starch gel. Consequently, the eco-friendly, stable, and biodegradable hydrogels will have a great potential application in removing anionic dyes from the wastewater produced by agriculture and industry.
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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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 16
·13471-13478
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IF 3.201
Weifan Ren,Xu Fei,Jing Tian,Yao Li,Muzi Jing,Huan Fang,Longquan Xu,Yi Wang
Enzyme–inorganic hybrid nanoflowers have drawn extensive research interest for enzyme immobilization owing to their enhanced enzymatic activity, high surface area, and excellent chemical stability. However, their low mechanical stability and challenging separation hinder their application. Herein, we report a facile and effective strategy to construct nanoflowers–PVA–chitosan composite (NPC) hydrogels that have excellent mechanical strength, high catalytic activity, and are easy to separate. Lipase–Cu3(PO4)2·3H2O nanoflowers were uniformly immobilized in hydrogel networks, and the substrate and the product can travel freely. The excellent mechanical properties of the hydrogels effectively protect the fragile nanoflowers from external stress, ensuring enzyme activity. Compared with free lipase (97.28 U g−1), NPC3 exhibited a higher enzymatic activity (146.12 U g−1) at 37 °C and pH 7.4. Furthermore, hydrogels as bulk materials can be processed into various physical forms, such as thin films and spheres. The product can easily flow out without the need for a separation process. It is expected that this immobilization method would have great potential in industrial catalysis.
研究领域:
生物化学
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材料科学
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酶工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Yuzhi Li,Linfeng Lan,Peng Xiao,Sheng Sun,Zhenguo Lin,Wei Song,Erlong Song,Peixiong Gao,Weijing Wu,Junbiao Peng
Short-channel electronic devices several micrometers in length are difficult to implement by direct inkjet printing due to the limitation of position accuracy of the common inkjet printer system and the spread of functional ink on substrates. In this report, metal oxide thin-film transistors (TFTs) with channel lengths of 3.5 ± 0.7 μm were successfully fabricated with a common inkjet printer without any photolithography steps. Hydrophobic CYTOP coffee stripes, made by inkjet-printing and plasma-treating processes, were utilized to define the channel area of TFTs with channel lengths as short as ∼3.5 μm by dewetting the inks of the source/drain (S/D) precursors. Furthermore, by introduction of an ultrathin layer of PVA to modify the S/D surfaces, the spreading of precursor ink of the InOx semiconductor layer was well-controlled. The inkjet-printed short-channel TFTs exhibited a maximum mobility of 4.9 cm2 V–1 s–1 and an on/off ratio of larger than 109. This approach of fabricating short-channel TFTs by inkjet printing will promote the large-area fabrication of short-channel TFTs in a cost-effective manner.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 6
·974
·
IF 2.972
Yu-Xi Gao,Jin-Wen Zou,Xiao-Feng Wang,Jie Yang,Zhuo Li,Yan-Yan Zhu,Hua-Ming Wang
In this paper, a wet-chemical based method was adopted to acquire the uniform dispersion of graphene nanosheets (GNSs) in a powder metallurgy nickel-based superalloy (FGH96) to fabricate a new GNSs reinforced FGH96 metal matrix composite. The surface of the FGH96 powder was modified using a hydrophilic surfactant named polyvinyl alcohol (PVA), which has good wettability and strong hydrogen bonding between the –OH groups of PVA and oxygen groups of GNSs such as –COOH, –CHO, and –OH. It was shown that the GNSs displayed much better dispersion uniformity on the PVA modified FGH96 powder than the unmodified one. The existence of PVA improved the adsorptive capacity of the GNSs attached on the powder surface and prevented the agglomeration in the following thermal preparation process. Consequently, the micro-hardness of PVA modified composite with 0.1 wt.% GNSs reached 497.9 HV, 3.4% higher than the unmodified FGH96 alloy. Therefore, this preparation process could act as the foundation of a common strategy for the fabrication of GNSs in metal matrix composites with good dispersion uniformity, which may have great potential application in aerospace applications.Keywords:powder metallurgical nickel-based superalloy;graphene nanosheets;PVA
研究领域:
材料科学
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航空航天工程
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2025
·
IF 4.9
Zhenting Wu,Ruifang Liu,Shaohua Xing,Qing Hao,Long Ba
Sweat monitoring can reflect human health status, and insensible sweat is crucial for assessing skin barrier functions and physiological status. The development of a flexible, breathable, and insensible sweat rate sensor is still a challenge. Here we prepared a fabric-based humidity sensor for human insensible sweat rate monitoring. In which the CS/PVA/CNP composite material has a significant response to changes in humidity, the humidity-sensitive material and interdigital electrodes are encapsulated in the middle of two layers of hydrophobic fabrics, which effectively avoids the influence of external water on the sensor; and it is also breathable, ensures the wearing comfort. The sensor is integrated with wireless communication and powering module to monitor the insensible sweat rate at different body locations continuously. Human testing demonstrated the feasibility of the system to assess the insensible sweat rate of the body under different exercise conditions. Our sensor provides a low-cost device platform that offers new ideas for research in personalized medicine and smart clothing.
研究领域:
生物医学工程
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智能纺织品
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可穿戴设备
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaoyan He,Caiyun Zhang,Meng Wang,Yunlei Zhang,Liqin Liu,Wu Yang
Conductive hydrogels are a class of composite materials that usually comprise hydrated polymers and conductive materials. Practical application requires the conductive hydrogels to have various properties such as high conductivity, toughness, self-healing, facile processing ability, and so on. Although challenging to have all the above-mentioned properties, a composite material composed of polymer hydrogel with embedded Au nanoparticles (i.e., P(NaSS)/P(VBIm-Cl)/PVA@Au) was found to show the comprehensive properties above in this paper. For example, P(NaSS)/P(VBIm-Cl)/PVA@Au exhibits mechanical and electrical self-healing properties at ambient conditions. In addition, P(NaSS)/P(VBIm-Cl)/PVA@Au is tough and thermoplastic, potentially making it useful for a variety of applications.
研究领域:
材料科学
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纳米技术
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复合材料
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产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 6
·1948-1958
·
IF 3.4
Huajun Wang,Junwei He,Liming Zou,Chao Wang,Yan Vivian Li
Different vinyl acetate (VAc) and vinyl benzoate (VBz) monomer ratios have been chosen as monomers to create high polymerization degree ( P n ) and high syndiotacticity-diad content ( S-diad ) poly(vinyl alcohol) (PVA) polymers via emulsifier-free polymerization in order to address the problem of limited mechanical capabilities of PVA fibers prepared with low P n and low S-diad polymer. The variations in hydrogen bonding, P n , S-diad , and viscosity of different PVA polymers were investigated and evaluated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, and a viscosity tester. Moreover, various PVA fibers with high strength and modulus have been manufactured using a synthetic polymer as the raw material for dry-wet spinning. The effect of P n and S-diad on the mechanical and thermal characteristics of PVA fibers is evaluated using a variety of characterization techniques, such as the scanning electron microscope, differential scanning calorimetry, thermogravimetric analyzer, X-ray diffraction, and tensile tester. As the ratio of VBz monomer increased, the results suggested that VBz may have a considerable impact on the P n and S-diad of PVA polymers, the OH vibration absorption peak reduced from 3491 to 3442 cm −1 ; the P n increased from 2112 to 17,704; and the S-diad rose from 51.2% to 60.1%. In addition to the fact that P n and S-diad significantly increased the fibers' strength and modulus, the crystallinity increased from 41.8% to 51.7%, and the orientation degree rose from 87.5% to 91.7%, as P n and S-diad increased; the tensile strength and highest elastic modulus increased from 9.71 ± 0.3 cN/dtex to 12.74 ± 0.5 cN/dtex (increased of 31.2%) and 264.52 ± 9.3 cN/dtex to 338.41 ± 8.6 cN/dtex (increased of 27.9%); the elongation at break decreased from 5.63 ± 0.3% to 2.92 ± 0.2%.
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 4
·1-16
·
IF 3.061
Guo Hui,Zhang Dong,Jiang Lanying
In this work, nanofibrous membranes for separating oil-in-water (O/W) emulsion were prepared by electrospinning. The membrane material was polymer blend of polyacrylonitrile (PAN)/polyvinyl alcohol (PVA), and by adjusting polymer composition and concentration, as well as applying crosslinking by glutaraldehyde (GD ) and hydrolysis inside NaOH solution, membrane with desired properties, particularly hydrophilicity and underwater oil repellency were obtained. For PAN/PVA composite membrane modified by glutaraldehyde for 1.5 h and NaOH for 1.5 h, the water contact angle initially was around 5° and decreased to 0 o with a transition time of only 0.3 s. The membrane also showed recommendable performance in O/W emulsion separation. Under a driving force of 0.8 kPa, the highest starting flux of 953 L/m 2 h and 532 L/m 2 h were registered with the treatment of surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE), respectively. The membrane recovered 96% of its initial flux in a 5-cycle reusability test using SFE, and the oil rejection coefficient maintained higher than 97%. FTIR and XPS characterizations confirmed the success in chemical modifications. It was also found that glutaraldehyde crosslinking helped to improve the macroscopic structure integrity of the membrane in aqueous environment.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 3
·290
·
IF 2.935
Gaofeng Zhao,Haiyue Ni,Shixue Ren,Guizhen Fang
Although lignin blending with thermoplastic polymers has been widely studied, the usefulness of the lignin–polymer composites is limited by the poor compatibility of the two components. In the present study, alkali lignin/PVA composite membranes were prepared by incorporating 10%, 15%, 20% and 25% alkali lignin into the composites. The thermodynamic parameters of the composites were measured using inverse gas chromatography (IGC). Composite membranes with 10%, 15%, 20%, and 25% alkali lignin had solubility parameters of 17.51, 18.70, 16.64 and 16.38 (J/cm3)0.5, respectively, indicating that the solubility parameter firstly increased, and then decreased, with increasing proportions of alkali lignin. When the alkali lignin content was 15%, the composites had the largest solubility parameters. The composite membrane with an alkali lignin content of 15% had a tensile strength of 18.86 MPa and a hydrophilic contact angle of 89°. We have shown that the solubility parameters of blends were related to mechanical and hydrophilic properties of the composites and the relationships have been verified experimentally and theoretically.Keywords:alkali lignin;composite membrane;inverse gas chromatography;the solubility parameter;preparation of composites;performance of composites
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 3
·70
·
IF 3.5
Li Xinran,Xia Zheyao,Zheng Yuansheng,Shang Shanshan,Xin Binjie
Conductive hydrogels represent a pivotal advancement for next-generation wearable electronics. However, simultaneously optimizing mechanical robustness, interfacial adhesion, and electromechanical sensitivity remains a significant challenge. In this study, a multifunctional poly(vinyl alcohol)/chitosan/multi-walled carbon nanotube (PCM) composite hydrogel was developed via a facile freeze-thaw strategy. The resulting PCM hydrogel exhibits reliable adhesive strength (12.1 kPa on porcine skin) with over 70% retention after 10 cyclic attachment-detachment tests. Notably, the hydrogel possesses a high electrical conductivity of 13.2 mS/cm, enabling superior sensing performance with a Gauge Factor (GF) of 5.72 under large strains and excellent durability over 500 cycles. Real-time monitoring of human joint motions (e.g., wrist, finger, and elbow) confirms its rapid response and high signal fidelity. These results underscore the potential of PCM hydrogels as a robust and high-performance interface for sophisticated human-machine interaction and sports health monitoring.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Linjun Wu,Siqi Huang,Jia Zheng,Zhongjie Qiu,Xuliang Lin,Yanlin Qin
The traditional polyvinyl alcohol composite hydrogel exhibited poor swelling and mechanical properties, which limited its application. To solve these issues, we use biomass lignin as raw material, PVA as matrix template and epichlorohydrin as cross-linker to prepare the Lignin-PVA super-absorbent hydrogels with the swelling ratio of up to 456 g/g under mild condition. When the lignin concentration was increased from vacancy to 5%, the swelling ratio of the Lignin-PVA hydrogels was increased from 92 g/g to 456 g/g. The lignin-based hydrogel synthesized by the higher molecular weight PVA showed better swelling performance. Softwood lignin, hardwood lignin and corncob lignin could also be used to fabricate the Lignin-PVA super-absorbent hydrogels with the swelling ratio of higher than 500 g/g. However, the optimum amount varied from different lignin types, which was related to the molecular weight and phenolic hydroxyl content of lignin. The structural mechanism of the Lignin-PVA hydrogel was proposed to clearly certify the enhancing role of lignin. The adsorption capacity of the Lignin-PVA hydrogel with respect to rhodamine 6G, crystal violet and methylene blue dyes was up to 196, 169 and 179 mg/g, respectively. The Lignin-PVA hydrogel presents great potential applications in the fields of soil water retention and seed cultivation in agriculture, and dye pollutant removal.
研究领域:
高分子材料
·
环境科学
·
农业工程
·
功能材料
·
污染治理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）