CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Zhongyang Zheng,Heping Li,Fangjian Li,Liyu Zheng,Shenming Yin,Xinyun Wang,Youwei Yan
Two-dimensional materials, impermeable to various mediums, have ignited the great interest in developing multifunction nanocomposite coatings. Even though Al 2 O 3 has excellent thermal and chemical stability, it is hard to obtain Al 2 O 3 nanosheets from their non-lamellar structured bulk counterparts. In this work, we have developed a bottom–up strategy to synthesize several-nanometer thick Al 2 O 3 nanosheets by taking graphene oxide as the templates, and further improved their dispersibility by modifying them with poly-dopamine (PDA). These PDA-modified Al 2 O 3 nanosheets were then successfully integrated into the nanosized ZrO 2 coating to enhance its anti-corrosion and gas permeation reduction properties. With the Al 2 O 3 nanosheets inserted, corrosion resistance and deuterium resistance of the ZrO 2 coating were increased by 1000% and 1557%, respectively, both of which were above two orders of magnitude higher than that of the 321 steel substrate. The significant improvements achieved by Al 2 O 3 nanosheets demonstrate their capacity to effectively block the diffusion of both ions and deuterium atoms. This work not only offers a new platform for fabricating nanosheets from non-lamellar structured materials, but also indicates tremendous potential of Al 2 O 3 nanosheets as a novel filler for developing high-performance functional coatings.
研究领域:
材料科学
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表面工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2024
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IF 5.7
Cuilian Wen,Hao Liu,Lijin Luo,Zhou Cui,Xiong Li,Junhao Jin,Siqing Yan,Peng Lin,Baisheng Sa
The realization of high-performance EMI shielding materials with flexible, ultrathin and outstanding shielding efficiency is crucial in addressing the growing concern over electromagnetic radiation from electronic devices. In this research, flexible and ultrathin PDA modified Ti3C2Tx MXene/bacterial cellulose (PM/BC) composite films with densely stacked lamellar structures have been developed through a combination of experimental and theoretical investigations. The microstructure, interface interaction, mechanical properties and EMI shielding efficiency of the composite films have been comprehensively investigated. It is highlighted that the strong interfacial interaction between PDA and MXene nanosheets contributes to the enhanced tensile stress (178.1 ± 7.5 MPa) and fracture strain (6.9 ± 0.2%) of the flexible and ultrathin PM/BC composite film, demonstrating its excellent resistance to external forces. More interestingly, the composite film exhibits a remarkable electrical conductivity of up to 39 840 S m−1 and a superior EMI shielding performance of 53.9 dB, indicating its ability to attenuate electromagnetic waves effectively. These findings provide a feasible strategy to develop ultrathin and flexible MXene-based composite films with exceptional EMI shielding capability, which have great potential in protecting electronic devices, including wearable electronic products.
研究领域:
材料科学
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电磁学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
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2023
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IF 2.9
Shen Jinhui,Liu Juan,Yang Siyi,Yao Xin,Fa Huanbao,Hou Changjun,Yang Mei
This work established a novel nucleic acid aptamer sensor for the sensitive and selective detection of AFB1 (Aflatoxin B1), which has important implication for food safety. In a word, we synthesized MXene/MWCNTs/NiCo 2 O 4 composite nanomaterials to improve the sensitivity of the aptamer sensor. The surface of the composite nanomaterials was modified with PDA (poly dopamine) in order to immobilize the NH 2 -cDNA-aptamer complex on the electrode surface by the Schiff base reaction. Characterization of MXene/MWCNTs/NiCo 2 O 4 nanocomposites was carried by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Meanwhile, 4-carboxy-2,2,6,6-tetramethylpiperidine 1-oxyl free radical (TEMPO-COOH) was used as an electrochemical signal to detect AFB1. Under optimal conditions, the electrochemical DPV signal decreased with increasing AFB1 concentration, ranging from 2.5 to 200 ng/mL, and the lowest limit of detection (LOD) at 1.890 ng/mL (S/N = 3). In addition, the ensemble sensor showed great reproducibility, stability, and selectivity, which has been successfully applied to the determination of AFB1 in maize flour and maize residue samples with recoveries in the 92.2 ~ 109.8% range. Compared to other detection methods for AFB1, this approach afforded comparable detection limits and detection ranges, in reduced analysis time (within 5 min). Thus, a time-saving, sensitive, and selective approach was achieved for the rapid determination of AFB1 in food.
研究领域:
食品安全
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分析化学
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生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
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2020
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IF 10.317
Yaojie Wei,Zhongqun Liu,Xu Zhu,Le Jiang,Weidong Shi,Yingjin Wang,Nan Xu,Fangli Gang,Xiumei Wang,Lingyun Zhao,Jun Lin,Xiaodan Sun
Peri-implant aseptic inflammation and osteolysis can cause aseptic loosening, leading to the failure of implants. Therefore, aseptic loosening of orthopedic implants remains an imminent problem for the development of durable and effective implants. In this work, a common anti-inflammatory drug (aspirin, ASA) was loaded in poly(lactic-co-glycolic acid) (PLGA) to construct nanofiber coatings on titanium (Ti) via electrospinning. The adhesion of the nanofiber coatings to Ti was ensured by polydopamine (PDA) modification. A stable and sustainable release of aspirin from the nanofiber coatings could last up to 60 days. Such electrospun PLGA@ASA nanofiber coatings could promote proliferation and osteogenic differentiation of bone mesenchymal stem cells (BMSCs) as well as inhibit M1 polarization and RANKL-induced osteoclast differentiation of macrophages in vitro . These results indicated that this facile formulation of the PLGA@ASA nanofiber coatings for long-term drug release could be expected to address the problem of aseptic loosening effectively in dual directions of both anti-inflammation and improving osseointegration simultaneously. Notably, the in vivo experiments demonstrated that PLGA@ASA nanofiber coatings did promote osseointegration ability of Ti implants significantly, even in challenging condition with wear particles, and also effectively inhibited Ti particle induced osteolysis around the implants. This work indicates a promising way for the development of durable and effective implants by using PLGA@ASA-PDA-Ti to address the problem of aseptic loosening in dual directions.
研究领域:
生物材料
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骨科
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组织工程
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药剂学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）