MACROMOLECULES
·
2024
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IF 5.1
Zhen Yu,Yanlin Liu,Sheng Wang,Yajin Fang,Xiangyu Zhou,Zhaobin Tang,Jin Zhu,Junping Zhang
Dynamic covalent adaptive networks can solve the recycling issue of thermosets. However, dissociative dynamic covalent networks may suffer from instability and network incompleteness at high temperatures or in solvents. Here, we report a novel dynamic covalent bond, N-sulfonyl guanidine urea (SGUA), that can undergo catalyst-free metathesis reactions, in which a passivation strategy of increasing the dissociation temperature of guanidine urea by introducing electron-withdrawing N-sulfonyl groups into adjacent positions was developed. Unlike conventional dissociative dynamic urea bonds, SGUAs exhibit associative metathesis reactions at around 120–180 °C, with a high dissociation threshold of 180 °C. The dynamic covalent polyurea constructed by SGUAs, named PSGUAs, exhibits ultrastrong (Young’s modulus exceeding 4 GPa and tensile strength exceeding 60 MPa) and stable (thermal stability, network structure integrity under reprocessing, and dimensional stability) performances. Furthermore, due to the excellent dynamic characteristics of SGUAs, PSGUAs were successfully reprocessed after 30–60 min of hot pressing at 160 °C and 20 MPa. Combining the long-lasting antibacterial properties of PSGUAs with long-term use, this study marks a substantial improvement in the field of dynamic polymer networks, giving a solution for balancing material stability, high performance, and reprocessability.
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Xiuling Li,Yuechuan Bi,Xiang Guan,Jiaqi Wang,Jinli Liu,Yingjie Zhao,Chunli Zhao,Zhuojian Li,Shurui Chi,Junnan Wang,Renjing Chen,Zixun Zhao,Zemin Wang,Xin Tong,Ninggui Ma,Han Liu,Zhiming Wang,Zongwen Liu,Yang Ren,Zhanhua Wei,Kebin Lin
Eco-friendly CsSnI 3 -based perovskite light-emitting diodes (PeLEDs) with the emission peak extending to the near-infrared-II (NIR-II) region hold tremendous potential for applications in biological monitoring, night vision, and optical communications. However, the various defects caused by the instability of Sn 2+ within the CsSnI 3 film, and the non-equilibrium carrier injection rate in the devices are the two major factors that limit the device performance. Here, we report high-performance NIR-II CsSnI 3 -based PeLEDs achieved by employing functional sulfaguanidine (SG) molecules. Due to the strong S═O─Sn coordination bonds, NH 2 ···I − hydrogen bonds could be formed between CsSnI 3 and SG, which effectively eliminated various Sn(II)-related defects in the CsSnI 3 film. Moreover, the SG molecules significantly improved the morphological uniformity and regulated the carrier injection balance, resulting in more balanced carrier injection that enhanced the effective radiation recombination rate. Consequently, the optimized CsSnI 3 -SG PeLEDs achieved a breakthrough external quantum efficiency (EQE) of 8.1%, which is the highest efficiency reported for CsSnI 3 -based PeLEDs to date.
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DOI
PubMed
高影响因子
Journal of Applied Spectroscopy
·
2025
·
IF 1
Xu Jia Jia,Shao Ke Man,Chen Su Yan,Lin Zheng Zhong
A rare earth complex was synthesized using α-thiophenoyltrifluoroacetone and o-phenanthroline as ligands. The complex was characterized by thermogravimetric analysis, infrared spectra, elemental analysis, and X-ray powder diffraction. The fluorescence spectra showed that the complex produced the characteristic fluorescence emission of Eu 3+ ions at 615 nm, highly overlapping with the absorption peak of malachite green to cause fluorescence quenching. Fluorescence lifetime confirmed that the quenching mechanism is a fluorescence resonance energy transfer at low concentration, and fluorescence resonance energy transfer and inner filter effect at high concentration. The complex could exclude the interference of other aquaculture fish drugs and has a specific selectivity for malachite green. Response time was within 1 min, and the linear range was 0.1–70 μmol/L. Detection limit was calculated to be 0.023 μmol/L (3σ/k, n = 9). Spiked recoveries of malachite green in water and fish were in the range of 89.2–98.6%, indicating that the complex could be used as a fluorescent probe for the detection of malachite green residues.
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DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Rongfang Yan,Xuelian Hu,Ning Zhang,Weihua Liu,Wenxiu Wang,Yiwei Tang
Fluorescent tripeptide nanoparticles (PNPs) emitting cyan fluorescence were first synthesized using a Trp-Phe-Phe/Zn(II)-based self-assemble method. Molecular docking and dynamics simulations were employed to elucidated the self-assembly process of PNPs, the underlying driving forces, and their influence on the fluorescence properties of PNPs. The resultant PNPs were functionalized with an aptamer specific to sulfadiazine (SDZ), thereby creating a highly sensitive fluorescent probe. This probe demonstrated exceptional sensitivity and selectivity for SDZ detection, leveraging the inner filter effect to induce significant fluorescence quenching. The method demonstrated a wide linear range (0–200 ng/mL) and a low detection limit (0.4 ng/mL). Validation in spiked real samples (tap water, beef, chicken, and fish muscle) yielded recoveries of 83.20–114.08 % with relative standard deviations of <7 %, confirming its accuracy and reliability. This study provides insights into the assembly mechanism of tripeptide nanoparticles and offers a practical tool for food safety monitoring.
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DOI
PubMed
高影响因子
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