ACS Applied Materials & Interfaces
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2020
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IF 8.758
Litao Ma,Zhewei Xu,Yidan Chen,Mingxin Zhang,Jiafu Yin,Mu Li,Kun Chen,Panchao Yin
The simultaneous improvement of catalytic activity and recyclability of metal oxides is exciting, however challenging, due to the paradox for particle size requirements. Herein, we report the design of polymer nanocomposites (PNCs) by covalently integrating a sub-nanoscaled metal oxide cluster (∼0.7 nm) into a polymer network with superelasticity. Due to the ultrasmall sizes of loaded clusters and the high swelling ratios (SRs) of PNCs, the swelled organogels from PNCs claim similar catalytic efficiencies to homogeneous catalysts, while their recyclability can be simply achieved after the catalytic reactions. Thanks to their robust mechanical properties, the PNCs can be processed into microgel particles for column reactors, enabling large-scale and continuous-flow catalysis.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Ye Zhang,Zhenxing Lu,Mengqing Liu,Yifan Wu,Zhiyang Qian,Shiyuan Zhou,Guangfeng Liu,Peng Wang,Zhangfa Tong,Peiyang Gu
Ionic covalent organic frameworks (iCOFs) with long-range ordered pore structures and chemical versatility have emerged as promising materials for engineering advanced membranes to tackle challenging separation demands. Nevertheless, the facile and controllable fabrication of continuous free-defect iCOF membranes (iCOFMs) for sub-nanosized molecular separation remains a critical challenge. Herein, the continuous iCOFMs have been fabricated on flexible polymer supports via the confined contra-diffusion interfacial polymerization strategy. Through adjusting the monomer concentration and reaction time, the conformal growth of iCOF along the polymer supports can be well-regulated to form continuous defect-free iCOFMs. The iCOFMs featuring hydrophilic ionic groups are in favor of generating sieving channels that promote water-selective transport. The optimal iCOFM exhibits superior butanol dehydration separation efficiency with a permeation flux of 12,620 g m −2 h −1 and a separation factor up to 3161, surpassing the most state-of-the-art membranes. Meanwhile, it maintains stable separation performance in long-term operation due to its exceptional chemical and mechanical stability. This study provides new insights for the construction of iCOFMs in precise sub-nanosized molecular separations.
研究领域:
材料科学
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膜技术
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Liang Mei,Yuefeng Zhang,Zimeng Ye,Ting Han,Honglu Hu,Ruijie Yang,Ting Ying,Weikang Zheng,Ruixin Yan,Yue Zhang,Zhenbin Wang,Zhiyuan Zeng
Fabricating solution-processable composite materials of transition metal dichalcogenides (TMDs) with ultrasmall noble metal structures employing an easy preparation method poses a significant challenge. In this study, we utilized a green, one-step synthetic method by directly employing electrochemical lithium intercalation-based exfoliated metallic TMD nanosheets (MoS2, WS2, and TiS2) to reduce palladium ions (Pd2+) to metallic Pd0, leading to the deposition on their surfaces. The resulting Pd nanoparticles (Pd NPs) in composites (Pd-MoS2, Pd-WS2, and Pd-TiS2) were found to be amorphous, with a size ranging from 0.81 to 1.37 nm. The impact of Pd NP size on hydrogen evolution reaction (HER) activity was elucidated. Among the fabricated composites, Pd-MoS2 exhibits the best HER performance, attributed to its smallest Pd NP size (0.81 nm). It shows an overpotential of 70 mV at a current density of 10 mA cm−2, along with a Tafel slope of 43 mV dec−1. These HER performance metrics surpass those of most Pd-decorated 2D catalysts.
研究领域:
材料科学
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纳米技术
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电化学
·
催化
✓ 已验证
DOI
高影响因子
MACROMOLECULES
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2025
·
IF 5.2
Meng Xie,Yan He,Rui Xue,Wenjie Fan,Menglu Li,Quan Sun,Jennifer Q. Lu,Zongbo Zhang,Wenxin Fu
Next-generation, high-frequency communication systems demand polymer nanocomposites with simultaneously ultralow dielectric constant (Dk < 2.0) and high thermomechanical stability while addressing the critical challenge of reconciling nanoscale dispersion uniformity with interfacial compatibility. Herein, we propose a molecular engineering strategy to covalently anchor oligomeric silsesquioxane domains within a benzocyclobutene resin (BCB) matrix via synergistic click chemistry and thermally triggered Diels–Alder cross-linking. The silsesquioxane precursors are precisely synthesized through platinum-catalyzed hydrosilylation and hydrolysis-polycondensation, enabling the formation of ladder/cage-like and networked Si–O–Si structures. This covalent integration strategy ensures uniform silsesquioxane dispersion at the subnanoscale, as evidenced by small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (TEM). The optimized nanocomposite exhibits an ultralow dielectric constant (Dk = 1.78) and loss (Df = 2.73 × 10–3) at 1.15 kHz, outperforming most reported BCB hybrids. This work establishes a molecular-scale engineering paradigm for low-Dk materials, offering transformative potential in 5G/6G communications and high-density integrated circuit technologies.
研究领域:
材料科学
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聚合物纳米复合材料
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介电材料
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电子封装
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高频通信系统
✓ 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）