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Multifunctional Nacre‑Like Nanocomposite Papers for Electromagnetic Interference Shielding via Heterocyclic Aramid/MXene Template‑Assisted In‑Situ Polypyrrole Assembly

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Nano-Micro Letters 2025年第3期17卷 37-54页

作者： Jinhua Xiong xu Zhao Zonglin Liu He Chen Qian Yan Huanxin Lian Yunxiang Chen Qingyu peng Xiaodong He National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080People’s Republic of China

Robust, ultra-flexible, and multifunctional MXene-basedelectromagnetic interference (EMI) shielding nanocomposite filmsexhibit enormous potential for applications in artificial intelligence,wireless telecommunication, and portable/wearable electronic *** this work, a nacre-inspired multifunctional heterocyclic aramid(HA)/MXene@polypyrrole (PPy) (HMP) nanocomposite paper withlarge-scale, high strength, super toughness, and excellent tolerance tocomplex conditions is fabricated through the strategy of HA/MXenehydrogel template-assisted in-situ assembly of PPy. Benefiting from the"brick-and-mortar" layered structure and the strong hydrogen-bondinginteractions among MXene, HA, and PPy, the paper exhibits remarkable mechanical performances, including high tensile strength (309.7 MPa),outstanding toughness (57.6 MJ m−3), exceptional foldability, and structural stability against ultrasonication. By using the template effect ofHA/MXene to guide the assembly of conductive polymers, the synthesized paper obtains excellent electronic conductivity. More importantly,the highly continuous conductive path enables the nanocomposite paper to achieve a splendid EMI shielding effectiveness (EMI SE) of 54.1 dBat an ultra-thin thickness (25.4 μm) and a high specific EMI SE of 17,204.7 dB cm2g−1. In addition, the papers also have excellent applicationsin electromagnetic protection, electro-/photothermal de-icing, thermal therapy, and fire safety. These findings broaden the ideas for developinghigh-performance and multifunctional MXene-based films with enormous application potential in EMI shielding and thermal management.

关键词： MXene Remarkable mechanical properties Heterocyclic aramid Electromagnetic interference shielding Polypyrrole Multifunctionality

Rapid and scalable preparation of highly quaternized polymer networks to achieve efficient simultaneous adsorption of iodide and pertechnetate

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Science China Chemistry 2025年第01期 337-349页

作者： Meiyun xu Song Gu Fulong Chen Zhe Zhao peng Liu Daoben Hua State Key Laboratory of Radiation Medicine and Protection School of Radiological and Interdisciplinary Sciences (RAD-X) Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Soochow University

The efficient separation of fission products,such as TcO4-and I-,holds strategic significance for the management of radioactive wastes and environmental *** this study,we propose an ultrafast strategy for scalable preparation of a highly quaternized organic network to facilitate efficient and synchronous separation of iodide and *** network can be prepared within a few minutes at room temperature,using polyethylenimine and 1,2,4,5-tetrakis（bromomethyl）benzene as building *** chlorine replacement,the network,abundantly decorated with quaternary ammonium groups （Cl@QPN）,exhibits an ultrahigh positive charge density of 7.6 mmol/*** enables the rapid and efficient enrichment of target anions through strong electrostatic Coulomb *** a result,Cl@QPN exhibits significantly higher adsorption rate constants of 0.830 g/（mg min） for ReO4-（a nonradioactive surrogate of TcO4-） and 0.677 g/（mg min） for I-compared to other ***,it possesses high adsorption capacities,reaching 1,681 mg/g for ReO4-and 917.4 mg/g for I-.Cl@QPN also demonstrates good selectivity towards target ions and shows efficient adsorption for99TcO4-.Additionally,Cl@QPN exhibits high dynamic processing capacities,handling up to 3,100 and 7,400 kg of simulated streams per kilogram of material for I-and ReO4-,respectively.

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Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

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Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng Huang Mudong Tu Hua Li Yong peng Wei Dou Cailing xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering School of Materials and Energy Lanzhou University College of Chemistry and Chemical Engineering Luoyang Normal University

Designing highly active and stable electrocatalysts of oxygen evolution reaction （OER） is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium（Rh@NiFe-MIL-53）,is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe（OH）2after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center （εd）,accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity （240 mV） with a small Tafel slope of 48.2 mV dec-1and long-term durability (over1270 h at 10 m A cm-2and 110 h at 200 mA cm-2).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： X ray photoelectron spectroscopy

消费者估值不确定下众筹定价策略及退款机制研究

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管理工程学报 2025年第1期39卷 256-270页

作者：徐扬毕功兵宋文吴娟安徽财经大学金融学院中国科学技术大学管理学院南京审计大学金融学院

众筹作为最受欢迎的互联网金融产品之一,受到工业界和学术界的广泛关注。基于现实背景,本文建立了两阶段众筹模型,研究了消费者估值不确定下消费者的策略性选择行为及其对众筹定价策略的影响。结论表明,若消费者参与众筹的额外效用较低... 详细信息

众筹作为最受欢迎的互联网金融产品之一,受到工业界和学术界的广泛关注。基于现实背景,本文建立了两阶段众筹模型,研究了消费者估值不确定下消费者的策略性选择行为及其对众筹定价策略的影响。结论表明,若消费者参与众筹的额外效用较低,消费者估值不确定会造成“搭便车”现象,导致最优众筹价格不是关于项目所需资金的单增函数。当项目所需资金较低或较高时,发起人应该设置较高的众筹价格,否则应该降低价格以激励更多的消费者参与众筹。通过对比传统销售模式,本文揭示了发起人可以利用消费者估值不确定性及众筹的预售机制增加销量或边际收益以提升利润。进一步,本文证明了退款机制可以有效增加消费者参与众筹的意愿,从而提高众筹的可行域。最后,本文将基本模型拓展到更加一般的情形,研究发现众筹市场大小、项目运作风险和生产能力均对最优定价决策有不可忽视的影响。

关键词：众筹定价决策估值不确定策略型消费者退款机制

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模拟研究卫-卫跟踪中星间隔的选择问题

天文学报 2005年第1期46卷 62-69页

作者：周旭华吴斌许厚泽彭碧波中国科学院测量与地球物理研究所动力大地测量重点实验室

从两个方面讨论了低轨卫星在做卫-卫跟踪(SST)观测时,星间隔的选择问题. 1)用地球重力位系数作为扰动量,比较该扰动引起的不同间隔的SST星间距离和速度变化大小. 2)用随机误差为1μm／s的星间速度变化作为模拟观测量,恢复不同间隔的 ... 详细信息

从两个方面讨论了低轨卫星在做卫-卫跟踪(SST)观测时,星间隔的选择问题. 1)用地球重力位系数作为扰动量,比较该扰动引起的不同间隔的SST星间距离和速度变化大小. 2)用随机误差为1μm／s的星间速度变化作为模拟观测量,恢复不同间隔的地球重力位系数,并做精度评估.两种结果表明,适当增大SST间隔对求解重力场有利, 但无限制增大无实际意义,对于选定高度为420 km卫星,在作SST观测时,星间隔不宜超过690km.此模拟方法及结果对我国确定重力卫星指标有着重要意义.

关键词： SST 重力位地球模拟观测重力卫星重力场低轨卫星间隔扰动系数

不同干扰程度对翅果油树种群结构与动态的影响

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山西师范大学学报（自然科学版） 2011年第3期25卷 103-108页

作者：卢鹏徐燕毕润成山西师范大学生命科学学院山西临汾041004

翅果油树(Elaeagnus mollisDiels)是国家Ⅱ级保护植物,处于濒危状态,由于缺乏不同干扰对种群结构与动态影响的研究,限制了对该种的全面认识和有效保护.本文对山西三个集结地(翼城,平陆,乡宁)的翅果油树种群作了调查研究,对比分析了三个... 详细信息

翅果油树(Elaeagnus mollisDiels)是国家Ⅱ级保护植物,处于濒危状态,由于缺乏不同干扰对种群结构与动态影响的研究,限制了对该种的全面认识和有效保护.本文对山西三个集结地(翼城,平陆,乡宁)的翅果油树种群作了调查研究,对比分析了三个样地的翅果油树种群的年龄结构,编制了翅果油树种群的静态时间生命表,绘制了种群的存活曲线、死亡率曲线和消失率曲线.结果表明:不同干扰程度的翅果油树种群,在种群结构、存活曲线及死亡率和消失率方面都有较大差别.其中,受人类干扰较少的平陆样地,翅果油树种群表现为大龄个体多,年龄结构较为稳定.

关键词：翅果油树干扰种群生命表存活曲线

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山西翅果油树群落特征及多样性研究

山西师范大学学报（自然科学版） 2011年第2期25卷 95-99页

作者：徐燕卢鹏毕润成山西师范大学生命科学学院山西临汾041004

翅果油树为国家二级珍稀濒危保护植物,集中分布于临汾的乡宁(西坡)、翼城(甘泉)和运城的平陆(狮沟、望远),本文通过对翅果油树群落区系成分、生活型、群落的结构与外貌及生物多样性的比较分析,探明了翅果油树群落基本性质及影响群落变... 详细信息

翅果油树为国家二级珍稀濒危保护植物,集中分布于临汾的乡宁(西坡)、翼城(甘泉)和运城的平陆(狮沟、望远),本文通过对翅果油树群落区系成分、生活型、群落的结构与外貌及生物多样性的比较分析,探明了翅果油树群落基本性质及影响群落变化的因素.结果表明:翅果油树群落区系组成较为丰富,群落物种生活型以高位芽居多,共占总数的43.14%,群落结构可分为灌、草两个层次,亦有层间植物伴生.群落多样性研究发现,在干扰强烈的生境中,翅果油树群落具有较低的丰富度指数、多样性指数和均匀性;干扰强度较小的生境中,群落具有较高的丰富度指数、多样性指数和均匀性.

关键词：翅果油树群落特征重要值多样性

A versatile synthetic strategy towards rare earth based metal-organic frameworks

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Science China Chemistry 2025年

作者： Quan Shi Yun-Hao xu Ming-Hui Chen peng Zhao Wen-Bo Deng Ji Xiong Kai Guo Ya-Qing Feng Bao Zhang School of Chemical Engineering and Technology Tianjin University Tianjin Collaborative Innovation Center of Chemical Science and Engineering Guangdong Laboratory Chemistry & Fine Chemical Industry Jieyang Center

Rare earth metal-organic frameworks (RE-MOFs) have drawn wide attention owing to diverse network structures and various application ***,due to the unpredictable formation of the nodes,it is still challenging to design novel RE-MOFs.A novel versatile strategy was developed employing a RE-acetate complex (RE2(CH3COO)6·4H2O) as a precursor to construct RE-MOFs.2D RE-MOFs (RE-DBP) and 3D RE-MOFs (RE-TCPP) could be obtained by using dicarboxylic porphyrin ligands H2DBP and tetracarboxylic porphyrin ligands H2TCPP,*** RE-MOFs were further synthesized to verify the universality of the *** crystalline RE-MOFs could also be prepared at room temperature via the developed strategy,which could significantly promote large-scale preparation and practical application of *** proof of the concept,the performance of porphyrin-based RE-MOFs was investigated in the photocatalytic cycloaddition of CO2with *** the RE-DBP(Co) MOFs,Tb-DBP(Co) exhibited the best photocatalytic performance,which was also greater than that of the corresponding 3D MOF Tb-TCPP(Co) due to the optimal 2D structure and thus the accelerated photogenerated charge separation and transfer *** work not only provides a novel versatile strategy to design and develop RE-MOFs,but also proposes a promising approach for the potential bulk production of RE-MOFs at room temperature.

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Visualization of the protective role of estrogen against female liver fibrosis via an ER viscosity NIR fluorescent probe

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Science China Chemistry 2025年第1期 360-368页

作者： Zheng Liu Changyu Zhang Zipeng Li Wanying Ma Jia Liu Xiang Xia Ning xu Wen Sun Jianjun Du Jiangli Fan Xiaojun peng State Key Laboratory of Fine Chemicals Dalian University of Technology Ningbo Institute of Dalian University of Technology

Endoplasmic reticulum(ER) viscosity has emerged as a new potential biomarker for hepatic fibrosis(HF). Herein, we report the first ER-targeting viscosity-responsive near-infrared(NIR) fluorescent probe HBT-PP for investigations of HF *** twisted intramolecular charge transfer(TICT) and the excited state intramolecular proton transfer(ESIPT) are combined to endow HBT-PP with the selective response towards viscosity(～62-fold) and a super large stokes shift(～320 nm). HBT-PP mainly targets organelle ER and is able to image the drug-or alcohol-induced viscosity elevation in living cells. Significantly,HBT-PP was successfully applied to visualize the gender difference in HF and the protective role of estrogen in restraining HF progression. Of note, after 10 min of stain with HBT-PP, HF lesions showed a stage-based response, indicating the potential of this probe in fast and early diagnosis of HF. These results clearly demonstrated the promising application of HBT-PP as a new tool for exploring ER viscosity-involved physiological and pathological processes.

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