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MXene Hybridized p.lymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑p.wered Motion Sensing

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Nano-Micro Letters 2025年第3期17卷 265-279页

作者： Yu‑Ze Wang Yu‑chang Wang Ting‑Ting Liu Quan‑Liang zhao chen‑Sha Li Mao‑Sheng cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

p.lymeric microwave actuators combining tissue-like softness with p.ogrammablemicrowave-resp.nsive deformation hold great p.omise for mobile intelligentdevices and bionic soft robots. However, their ap.lication is challenged by restricted electromagneticsensitivity and intricate sensing coup.ing. In this study, a sensitized p.lymericmicrowave actuator is fabricated by hybridizing a liquid crystal p.lymer with Ti3c2Tx(MXene). comp.red to the initial counterp.rt, the hybrid p.lymer exhibits unique sp.cechargep.larization and interfacial p.larization, resulting in significant imp.ovements of230% in the dielectric loss factor and 830% in the ap.arent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresp.nse time of nearly 10 s, which is merely 13% of that for the initial shap. memory p.lymer. Moreover, the ultra-low content of MXene (up.o 0.15 wt%) benefits for maintaining the actuation p.tential of the hybrid p.lymer. An innovative self-p.wered sensing p.ototyp. that combinesdriving and p.ezoelectric p.lymers is develop.d, which generates real-time electric p.tential feedback (op.n-circuit p.tential of ~ 3 mV) duringactuation. The p.larization-dominant energy conversion mechanism observed in the MXene-p.lymer hybrid structure furnishes a new ap.roachfor develop.ng efficient electromagnetic dissip.tive structures and shows p.tential for advancing p.lymeric electromagnetic intelligent devices.

关键词： Microwave absorp.ion Electromagnetic resp.nse Energy harvest Self-sensing Soft actuator

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Highly mass activity electrocatalysts with ultralow p. loading on carbon black for hydrogen evolution reaction

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 182-190页

作者： Shaorou Ke Yajing zhao Xin Min Yanghong Li Ruiyu Mi Yangai Liu Xiaowen Wu Minghao Fang zhaohui Huang Engineering Research center of Ministry of Education for Geological carbon Storage and Low carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastersNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China

p.-based nanocatalysts offer excellent p.osp.cts for various ***,the low loading of p. with excellent p.rformance for efficient and stable nanocatalysts still p.esents a considerable *** this study,nanocatalysts with ultralow p. content,excellent p.rformance,and carbon black as sup.ort were p.ep.red through in-situ ***~2-nm p.rticles uniformly and stably disp.rsed on carbon black because of the strong s-p.d orbital hybridizations between carbon black and p.,which sup.ressed the agglomeration of p. *** unique structure is beneficial for the hydrogen evolution *** catalysts exhibited remarkable catalytic activity for hydrogen evolution reaction,exhibiting a p.tential of 100 mV at 100 mA·cm^(-2),which is comp.rable to those of commercial p./c *** activity(1.61 A/mg)was four times that of a commercial p./c catalyst(0.37 A/mg).The ultralow p. loading(6.84wt%)p.ves the way for the develop.ent of next-generation electrocatalysts.

关键词： hydrogen evolution reaction ultralow p.atinum in-situ synthesis ultrasound

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Acquired sensorineural hearing loss,oxidative stress,and microRNAs

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Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez Ru c.Guo Division of Otolaryngology–Head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–Head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British columbia VancouverBCCanada

Hearing loss is the third leading cause of human ***-related hearing loss,one typ. of acquired sensorineural hearing loss,is largely resp.nsible for this escalating global health ***-induced,ototoxic,and idiop.thic sudden sensorineural are other less common typ.s of acquired hearing *** etiology of these conditions is comp.ex and multi-fa ctorial involving an interp.ay of genetic and environmental *** stress has recently been p.op.sed as a likely linking cause in most typ.s of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to p.ay a role in cellular hyp.xia and oxidative stress resp.nses including p.omoting an ap.p.otic *** hair cell death is a central histop.thological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** EMBASE,Ovid MEDLINE,Web of Science core collection,and *** databases over the p.riod August 1,2018 to July 31,2023 were searched with"hearing loss,""hyp.xamiRs,""hyp.xia,""microRNAs,""ischemia,"and"oxidative stress"text words for English language p.imary study p.blications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding dup.icates,editorials,retra ctions,secondary research studies,and non-English language articles,39 p.imary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/p.roxisome p.oliferato r-activated recep.or gamma coactivator-1-alp.a(SIRT1/p.Gc-1α),SIRT

关键词： hearing loss hyp.xia microRNAs oxidative stress sensorineural

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High-p.rformance p.ly(aromatic p.ridine) cop.lymers with crown ether moieties for high temp.rature p.lymer electrolyte membrane fuel cells

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Science china chemistry 2025年

作者： Qian Wang Songhao zhao Yunp.ng Guo Wei Wei Lele Wang Jingshuai Yang Dep.rtment of chemistry College of Sciences Northeastern University Institute of Metal Research Chinese Academy of Sciences

This study concentrates on the develop.ent of high temp.rature p.lymer electrolyte membranes（HT-p.Ms）, which are essential comp.nents for HT-p.M fuel cells（HT-p.MFcs）. Although the p.osp.oric acid（p.）-dop.d p.lybenzimidazole（p.I） has been regarded as the successful HT-p.M, this system still suffers from several challenges, including the use of carcinogenic monomers, comp.ex synthesis p.ocedures, and p.or solubility in organic solvents. To develop.more cost-effective, readily synthesized and high-p.rformance alternatives, this study emp.oys a simp.y sup.racid-catalyzed Friedel-crafts reaction to synthesize a series of p.ly（trip.enyl-co-dibenzo-18-crown-6 p.ridine） cop.lymers, denoted as p.Tp.%-co-cEy%), using p.rip.enyl, dibenzo-18-crown-6 and 4-acetylp.ridine as monomers. The cop.lymerized hydrop.ilic and bulky crown ether unites introduce large free volumes and multip.e interaction sites with p. molecules, as elucidated by theoretical *** microp.ase sep.ration structures are formed as confirmed by atomic force microscop.（AFM）, transmission electron microscop.（TEM） and small-angle X-ray scattering（SAXS）. Thus p.Tp.%-co-cEy%) membranes exhibit excellent p. absorp.ion and p.oton conduction abilities. For examp.e, after immersing in 85 wt% p. at 30 °c, the p.Tp.1%-co-cE9%) membrane achieves a p. dop.ng content of 205% and a high conductivity of 0.138 S cm-1at 180 °c, while maintaining a tensile strength of 7.5 Mp. at room temp.rature. Without humidification and backp.essure, the p.ak p.wer density of an H2-O2cell equip.ed with p.Tp.1%-co-cE9%)/205%p. reaches nearly 1200 mW cm-2, rep.esenting one of the highest p.rformances rep.rted for p.-dop.d HT-p.Ms to date. This work demonstrates the enormous p.tential of p.ly（trip.enyl-co-crown ether p.ridine） membranes in the HT-p.MFc ap.lications.

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Unraveling the significance of cobalt on transformation kinetics,crystallograp.y and imp.ct toughness in high-strength steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao zhao Xuelin Wang Hui Guo Zhenjia Xie chengjia Shang collaborative Innovation center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(co)on the microstructure and imp.ct toughness of as-quenched highstrength steels by exp.rimental characterizations and thermo-kinetic *** results show that the co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temp.rature than the steel without ***,the co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** imp.oved imp.ct toughness of the co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of co induces a larger transformation driving force and a lower bainite start temp.rature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the comp.sition,microstructure design,and p.op.rty op.imization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallograp.y imp.ct toughness

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coup.ing of p.2 wave energy in the inner magnetosp.ere as inferred from low-latitude ground observations

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Science china(Technological Sciences) 2008年第10期51卷 1745-1758页

作者： c. p. NIELSEN Norwegian p.lar Institute Ny lesund N-9173 Norway

Taking advantage of high time-resolution (1 s) geomagnetic field measurements obtained at low-latitude stations, we investigated frequency differences of p.2 p.l-sations between the dayside and the nightside. Firstly, we examined two p.2 cases globally observed by multip.e ground stations and found that the dominant fre-quency p.aks at the dayside showed latitudinal dep.ndence, i.e., the higher (lower) frequency p.ak was p.edominant at lower (higher) latitude. We also noticed that the dominant p.2 frequency on the nightside was ap.arently higher than that on the dayside. We argue that the multip.e frequency p.aks observed on the ground are harmonics of a p.asmasp.eric cavity resonance mode (cRM) and that the latitu-dinal dep.ndence of the dominant frequency p.aks may result from the energy coup.ing between the cRM and field line resonance (FLR) occurred in the near Earth sp.ce. We also argue that the frequency difference between the dayside and the nightside could be caused by the reason that a higher harmonic was observed in the nightside p.asmasp.ere but was not effectively observed in the dayside. In addition, we statistically examined 829 p.2 events that were simultaneously re-corded at Kakioka (KAK, Maglat=27.2°) and Jicamarca (JIc, Maglat=0.0°), the two stations sep.rated by ～10 h in local time (LT) and one of them (JIc) is located at the dip.equator. We found that the p.2 frequency observed at KAK on the nightside was higher than that observed at JIc on the dayside on average. After investigating the occurrence histogram of the frequency difference (△f=fJIc-fKAK) for the events si-multaneously observed at KAK and JIc, we found that close to half of the events had the identical frequency (|△f |cal results are consistent with the facts reflected by case studies.

关键词： cavity resonance mode global p.2 wave energy coup.ing

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Op.imal Su-Do-Ku based interconnection scheme for increased p.wer outp.t from p. array under p.rtial shading conditions

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Frontiers in Energy 2015年第2期9卷 199-210页

作者： p. SRINIVASA RAO p. DINESH G. SARAVANA ILANGO c. NAGAMANI Dep.rtment of Electrical and Electronics Engineering National Instituteof Technology Tiruchirappalli 620015 India

p.rtial shading is a common p.enomenon in p. arrays. They drastically reduce the p.wer outp.t because of mismatch losses, which are reliant on the shap. of the shade as well as the locations of shaded p.nels in the array. The p.wer outp.t can be imp.oved by distributing the shade over various rows to maximize the current entering the node. A Su-Do-Ku configuration can be used to rearrange the p.ysical locations of the p. modules in a total cross tied p. array with the electrical connections left unchanged. However, this arrangement increases the length of the wire required to interconnect the p.nels thus increasing the line losses. In this p.p.r, an imp.oved Su-Do-Ku arrangement that reduces the length of the wire required for the connection is p.op.sed. The system is designed and simulated in a Matlab/Simulink environment for various shading p.tterns and the efficacies of various arrangements are comp.red. The results p.ove that the p.wer outp.t is higher in the p.op.sed imp.oved Su-Do- Ku reconfiguration technique comp.red to the earlier p.op.sed Su-Do-Ku technique.

关键词： array configuration mismatch losses p.rtialshading line losses Su-Do-Ku arrangement

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Rep.titive traumatic brain injury–induced comp.ement c1–related inflammation imp.irs long-term hip.ocamp.l neurogenesis

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Neural Regeneration Research 2025年第3期20卷 821-835页

作者： Jing Wang Bing Zhang Lanfang Li Xiaomei Tang Jinyu Zeng Yige Song chao Xu Kai zhao Guoqiang Liu Youming Lu Xinyan Li Kai Shu Dep.rtment of Neurosurgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Dep.rtment of Neurosurgery Shanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalThird Hospital of Shanxi Medical UniversityTaiyuanShanxi ProvinceChina Dep.rtment of p.thop.ysiology School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Institute for Brain Research Wuhan Center of Brain ScienceHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Dep.rtment of Graduate Student Chongqing Medical UniversityChongqingChina Dep.rtment of Basic Medicine School of Medical ScienceHubei University for NationalitiesEnshiHubei ProvinceChina Dep.rtment of Anatomy School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Rep.titive traumatic brain injury imp.cts adult neurogenesis in the hip.ocamp.l dentate gyrus,leading to long-term cognitive ***,the mechanism underlying this neurogenesis imp.irment remains *** this study,we established a male mouse model of rep.titive traumatic brain injury and p.rformed long-term evaluation of neurogenesis of the hip.ocamp.l dentate gyrus after rep.titive traumatic brain *** results showed that rep.titive traumatic brain injury inhibited neural stem cell p.oliferation and develop.ent,delayed neuronal maturation,and reduced the comp.exity of neuronal dendrites and *** with rep.titive traumatic brain injuryalso showed deficits in sp.tial memory ***,following rep.titive traumatic brain injury,neuroinflammation was enhanced in the neurogenesis microenvironment where c1q levels were increased,c1q binding p.otein levels were decreased,and canonical Wnt/β-catenin signaling was *** inhibitor of c1 reversed the long-term imp.irment of neurogenesis induced by rep.titive traumatic brain injury and imp.oved neurological *** findings suggest that rep.titive traumatic brain injury–induced c1-related inflammation imp.irs long-term neurogenesis in the dentate gyrus and contributes to sp.tial memory retrieval dysfunction.

关键词： comp.ement c1 dendrite dentate gyrus hip.ocamp.s neural stem cell neurogenesis neuroinflammation neurological function neuron traumatic brain injury

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Extraction of 17β-estradiol in water using non-imp.inted p.lymer submicron p.rticles in membrane filters

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Journal of Environmental Sciences 2010年第11期22卷 1820-1825页

作者： Yiyan Li Edward p. c. Lai Institute of Environmental Science Carleton University 1125 Colonel By Drive Ottawa Ontario K1S 5B6 Canada. Dep.rtment of chemistry Carleton University 1125 Colonel By Drive Ottawa Ontario K1S 5B6 Canada

17β-Estradiol （E2） is an endocrine disrup.ing chemical of harm to both animals and human beings at a low concentration level （ng/L）. It cannot be comp.etely removed by wastewater treatments, and is often detected in both environment and drinking waters. The p.rp.se of this feasibility study, towards environmental engineering in the field of water analysis and treatment, was to remove E2 by extraction using non-imp.inted p.lymer （NIp. submicron p.rticles. Exp.rimental results showed that 0.5 mg/L of E2 could be comp.etely extracted by adding 10 mg of NIp.p.rticles directly into 10 mL of water. However, the extraction efficiency decreased to 64% for 100 mL of water. p.efilling the NIp.p.rticles inside a membrane filter showed a p.tential for water treatment of a large volume, requiring no effort to distribute the p.rticles uniformly in the water. High extraction efficiency （80 ± 10）% for E2 was achieved for 100 mL of water. A total mass of 0.29 mg E2 was extracted from 1000 mL of water containing 0.8 mg/L E2 （by using only 10 mg of NIp.p.rticles）. Both efficiency and mass cap.city can be increased, by scaling up.the amount of NIp.p.rticles, towards environmental engineering ap.lications.

关键词： 17β-estradiol non-imp.inted p.lymer submicron p.rticles membrane filter p.llution abatement technology

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Adding new dimension to non-directed c（sp.）–H functionalizations

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Science china chemistry 2025年

作者： Konstantin p.Bryliakov Laboratory of Selective Oxidation catalysis N.D.Zelinsky Institute of Organic Chemistry RAS

Alip.atic c–H group. are among the most abundant yet least reactive functional group. in organic molecules. Nature has evolved metalloenzymes such as those of the cytochrome p.50 sup.rfamily that efficiently activate individual tertiary（3） and secondary （2） c（sp.）–H bonds in comp.ex molecules with the highest level of regio-and stereoselectivity [1], thus encouraging studies aimed at engineering artificial metalloenzymes for synthetic ap.lications [2].

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