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Relating microstructure to magnetocaloric properties in RE_(36)Tb_(20)Co_(20)Al_(24)(RE=Gd,Dy or Ho)high-entropy metallic-glass microwires designed by binary eutectic clusters method

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Journal of Materials Science & Technology 2023年第18期149卷 167-176页

作者： Hangboce Yin Jun-Qiang Wang Yongjiang Huang Hongxian Shen Shu Guo Hongbo Fan juntao huo Jianfei Sun School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Center for Analysis Measurement and Computing Harbin Institute of TechnologyHarbin 150001China Space Environment Simulation Research Infrastructure Harbin Institute of TechnologyHarbin 150001China

The new high-entropy metallic-glasses(HE-MGs)are designed by using Dy and Ho to replace Gd in Gd_(36)Tb_(20)Co_(20)Al_(24)alloy based on the binary eutectic clusters *** with the equiatomic Gd 25 Tb 25 Co 25 Al 25 HE-MG,the non-equiatomic RE_(36)Tb_(20)Co_(20)Al_(24)(RE=Gd,Dy,or Ho)alloys show bet-ter glass-forming ability,which is attributed to the deep binary eutectic compositions used for alloy *** RE_(36)Tb_(20)Co_(20)Al_(24)alloys undergo second-order magnetic *** extreme peak value of magnetic entropy change is obtained as 10.3 J kg^(-1) K-1(5 T)for the Ho_(36)Tb_(20)Co_(20)Al_(24)***-situ high-energy synchrotron X-ray diffraction was conducted to observe the microstructural difference among non-equiatomic samples at cryogenic *** results indicate that Gd_(36)Tb_(20)Co_(20)Al_(24)alloy possesses a relatively large average value of the dispersion of local clusters at a low-temperature ***,com-bined with the critical exponentβclose to 0.5 of Gd_(36)Tb_(20)Co_(20)Al_(24)alloy,leads to its widest working temperature span among non-equiatomic *** work successfully establishes the connection be-tween microstructure and magnetocaloric properties of HE-MGs,which is beneficial for understanding the physical mechanism of the magnetocaloric behaviors of HE-MGs.

关键词： High-entropy metallic-glass Magnetocaloric effect High energy synchrotron X-ray diffraction Cryogenic temperature

Development,verification and application of a versatile aerosol calibration system for online aerosol instruments

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Particuology 2023年第3期74卷 48-55页

作者： Chengfeng Liu Cheng-Jung Huang Kan Huang Sheng-Hsiu Huang juntao huo Yusen Duan Yanfen Lin Center for Atmospheric Chemistry Study Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3)Department of Environmental Science and EngineeringFudan UniversityShanghai200433China Zhang Jia International Co. LTDTaipeiTaiwanChina Institute of Environmental and Occupational Health Sciences College of Public HealthTaiwan UniversityTaipeiTaiwanChina Shanghai Environmental Monitoring Center Shanghai200235China IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai200433China Institute of Eco-Chongming(IEC) Shanghai202162China

Traditional calibration methods mostly focus on the calibration of detection systems while the calibration from the sampling and pre-condition systems to the detection system is usually *** this regard,a Primary Standard Aerosol Mass Concentration Calibration System(PAMAS)is developed for the whole-process calibration of time-resolved aerosol measurement *** is composed of a particle generation chamber,an ultrasonic atomizer,a dilution system,and a syringe *** is designed to steadily generate standard aerosol particles of known concentrations(≤250μg/m^(3)),chemical compositions,and stable particle size *** aerosol can be generated in the size range of hundreds of nanometers to several micrometers with a narrow size *** generated particles with different compositions generated by PAMAS have been well verified by the filter-based gravimetric method,yielding accuracy and R^(2) of more than 95%and 0.999 in a wide concentration *** response time by changing the target concentration of reference particles is 1-2 *** has been applied to various types of time-resolved aerosol measurement instruments,including particle mass concentration monitors(Beta Attenuation and Tapered Element Oscillating Microbalance),online Ion Chromatograph,and semi-continuous OCEC carbon aerosol *** consistent results between PAMAS and calibrated instruments can be obtained if the instruments are functioning *** for instruments with certain technical issues,PAMAS can serve as a good tool for performance evaluation and quality assurance of the instruments and the accuracy of the measurement data can be adjusted based on the calibration results.

关键词： PAMAS Whole-process calibration Time-resolved aerosol measurement instruments

Influence of thermal history on the crystallization behavior of high-Bs Fe-based amorphous alloys

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 173-180页

作者： Bowen Zang Lijian Song Richard Parsons Jie Shen Meng Gao Yan Zhang juntao huo Yonghao Sun Fushan Li Kiyonori Suzuki Jun-Qiang Wang Weihua Wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Materials Science and Engineering Monash UniversityClayton VIC 3800Australia Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

A crucial step in creating cutting-edge soft magnetic alloys is the nanocrystallization of Fe-based amorphous ***,it is unclear how the thermal history affects the *** this work,high-precision nanocalorimetry and in-situ hightemperature transmission electron microscopy are used to systematically examine how the pre-annealing relaxation process affects the nanocrystallization of Fe-based amorphous *** discover that the glass with more thermal energy storage will crystallize into superb nanocrystalline structures with exceptionally advanced soft *** soft magnetic properties of Fe-B nanocrystalline alloys can be improved by increasing the relaxation *** finding provides solid and clear evidence for the influences of thermal history on crystallization behavior for Fe-based amorphous alloys,which is helpful for designing advanced soft magnetic nanocrystalline alloys.

关键词： amorphous alloys enthalpy relaxation nanocrystallization microstructure development soft magnetic properties

Response of PM_(2.5)-bound elemental species to emission variations and associated health risk assessment during the COVID-19 pandemic in a coastal megacity

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Journal of Environmental Sciences 2022年第12期34卷 115-127页

作者： Guochen Wang Kan Huang Qingyan Fu Jia Chen juntao huo Qianbiao Zhao Yusen Duan Yanfen Lin Fan Yang Wenjie Zhang Hao Li Jian Xu Xiaofei Qin Na Zhao Congrui Deng Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai Environmental Monitoring Center Shanghai 200030China Pudong New District Environmental Monitoring Station Shanghai 200122China Chinese Research Academy of Environmental Sciences Beijing 100012China IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai 200433China Institute of Eco-Chongming(IEC) Shanghai 202162China

The coronavirus(COVID-19)pandemic is disrupting the world from many *** this study,the impact of emission variations on PM_(2.5)-bound elemental species and health risks associated to inhalation exposure has been analyzed based on real-time measurements at a remote coastal site in Shanghai during the *** trace elemental species decreased significantly and displayed almost no diel peaks during the *** the lockdown,they rebounded rapidly,of which V and Ni even exceeded the levels before the lockdown,suggesting the recovery of both inland and shipping *** sources were identified based on receptor *** combustion accounted for more than 70%of the measured elemental concentrations before and during the *** emissions,fugitive/mineral dust,and waste incineration all showed elevated contributions after the *** total non-carcinogenic risk(HQ)for the target elements exceeded the risk threshold for both children and adults with chloride as the predominant species contributing to ***,the total carcinogenic risk(TR)for adults was above the acceptable level and much higher than that for *** incineration was the largest contributor to HQ,while manufacture processing and coal combustion were the main sources of *** control measures were beneficial for lowering the carcinogenic risk while unexpectedly increased the non-carcinogenic *** the perspective of health effects,priorities of control measures should be given to waste incineration,manufacture processing,and coal combustion.A balanced way should be reached between both lowering the levels of air pollutants and their health risks.

关键词： COVID-19 lockdown PM_(2.5)-bound elemental species Source apportionment Health risk Shanghai

Fast degradation of azo dye by nanocrystallized Fe-based alloys

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 76-80页

作者： PeiPei Wang JunQiang Wang juntao huo Wei Xu XinMin Wang Gang Wang School of Materials Science and Engineering Shanghai University CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences

Exploring new alloys with high efficiency in degrading organic pollutants in aqueous solutions is of wide interests. Here, we report that the nanocrystallized Fe_(82.65)Si_4B_(12)Cu_(1.35) alloy exhibits higher efficiency in decolorizing azo dye solutions compared to its amorphous counterpart. The increased efficiency is attributed to the formation of numerous microbatteries between the α-Fe(Si)and Fe_2 B nanocrystalline phases, which exhibit different corrosion potentials. These results suggest that nanocrystallized Fe-based amorphous composites hold promising application potential in degrading azo dyes solutions.

关键词： nanocrystalline alloys amorphous alloys degradation of azo dye

Abnormal relaxation kinetics in D-mannitol glass confined by nanoporous alumina

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Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 73-77页

作者： YaRu Cao LiJian Song Ao Li juntao huo FuShan Li Wei Xu Jun-Qiang Wang College of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of ScienceBeijing 100049China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The relaxation kinetics and phase transformations of the confined D-mannitol(DM)in nanoporous alumina are studied in-situ using a high-precision *** find that the crystallization behavior can be suppressed when it is confined in nanopores smaller than 50 *** confined DM glass has a much smaller fragility(~76)than free DM glass(~125),confirming the enhanced glass-forming *** is intriguing that during isothermal annealing both the confined and free DM glasses relaxation kinetics experience two relaxation stages that have distinct activation *** relaxation activation energy of the confined glass is about 25%-29%smaller than the free glass,which is attributed to the reduced *** abnormal kinetics observed in the confined DM glass open a new avenue for preparing stable glasses.

关键词： D-mannitol glass confinement relaxation crystallization

Online single particle analysis of chemical composition and mixing state of crop straw burning particles： from laboratory study to field measurement

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 244-252页

作者： juntao huo Xiaohui LU Xinning WANG Hong CHEN Xingnan YE Song Gao Deborah S. Gross Jianmin CHEN Xin YANG Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Fudan University Shanghai 200433 China Division of Math Science and Technology Nova Southeastern University Fort Lauderdale FL 33314 USA Department of Chemistry Carleton College Northfield MN 55057 USA Fudan-Tyndall Center Fudan University Shanghai 200433 China

Fresh straw burning （SB） particles were generated in the laboratory by the combustion of rice straw and corn straw. The chemical composition and mixing state of the fresh SB particles were investigated by an Aerosol Time-of-Flight Mass Spectrometer （ATOFMS）. Based on the mass spectral patterns, the SB particles were clustered into four major types： Salt, Organic Carbon （OC）, Elemental Carbon （EC）, and internally mixed particles of EC and OC （EC-OC）. In addition, particles containing ash, polycyclic aromatic hydrocarbons, heavy metals or nicotine were also observed. Physical and chemical changes of the SB particles immediately after the emission were analyzed with highly time-resolved data. During the aging processes, the average particle size increased steadily. Freshly emitted organic compounds were gradu- ally oxidized to more oxygenated compounds in the OC- containing particles. Meanwhile, an important displace- ment reaction （2KCI＋ SO24- KzSO4 ＋ 2C1-） was observed. The marker ions for SB particles were optimized and applied to identify the SB particles in the ambient atmosphere. The fluctuation of the number fraction of ambient SB particles sorted by ATOFMS agrees well with that of water soluble K＋ measured by an online ion chromatography, demonstrating that the optimized marker ions could be good tracers for SB particles in field measurements.

关键词： crop straw burning particles mixing state,aging process ATOFMS ion markers

Motion-pressure coupled control and simulation of long-endurance capability for multicapsule stratospheric airships

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Chinese Journal of Aeronautics 2024年第6期37卷 137-150页

作者： Zhiguang SHI Wei huo Zongyu ZUO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Beijing Near Space Airship Technology Development Co. LtdBeijing 100070China

The current study focuses on the motion-pressure coupled control for a multicapsule stratospheric airship and transforms the path-tracking and heading-hold control of airships into guidance tracking with a time-varying weighted sum of longitudinal and lateral velocities by the definition of compound ***,an improved nonlinear predictive control method is provided to reduce the control energy consumption by the rolling optimization of controller parameters based on finite time intervals,ensuring infinite-time path-tracking ***,combined with the proposed cyclic regulation process of safe pressure between internal and external capsules,this study can fully reflect the force-thermal coupled rule of airships under the actions of atmospheric environment and maneuvering force,while evaluating the long-endurance capability of airships under the conditions of safe superheating and *** effectiveness of the motionpressure coupled controller was verified through numerical simulations,which can overcome the influence of environmental wind and achieve a tracking effect for the desired cruise path and compound *** airspeed provided during the cyclic circadian time caused the maximum superheating of the helium controlled within 30*** helium in the internal and external capsules achieved circadian *** equivalent micropore diameter of the capsule of 5 mm can achieve 55 days of long-endurance *** controller satisfies the requirements of cruise-flight application modes for multicapsule stratospheric airships with important engineering value.

关键词： Compound speed Nonlinear predictive control Cyclic pressure regulation Long-endurance capability Stratospheric airship

High performance photodegradation resistant PVA@TiO_(2)/carboxyl-PES self-healing reactive ultrafiltration membrane

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Chinese Journal of Chemical Engineering 2024年第2期66卷 31-39页

作者： Yu Liang Yuanfang Fan Zhongmin Su Mingxin huo Xia Yang Hongliang huo Chi Wang Zhi Geng College of Environment Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast ChinaMinistry of EducationNortheast Normal UniversityChangchun 130117China School of Science Hainan UniversityHaikou 570225China

The occurrence of ultrafiltration(UF)membrane fouling frequently hampers the sustainable advancement of UF *** self-cleaning UF membranes can effectively alleviate the problem of membrane ***,the self-cleaning process may accelerate membrane *** these concerns,we present an innovative design concept for composite self-healing materials based on self-cleaning UF *** begin,TiO_(2)nanoparticles were incorporated into the polymer molecular structure via molecular design,resulting in the synthesis of TiO_(2)/carboxyl-polyether sulfone(PES)hybrid ***,the nonsolvent-induced phase inversion technique was employed to prepare a novel of UF ***,a polyvinyl alcohol(PVA)hydrogel coating was applied to the hybrid UF membrane surface to create PVA@TiO_(2)/carboxyl-PES self-healing reactive UF *** establishing a covalent bond,the TiO_(2)nanoparticles were effectively and uniformly dispersed within the UF membrane,leading to exceptional self-cleaning ***,the water-absorbing and swelling properties of PVA hydrogel,along with its capacity to form hydrogen bonds with water molecules,resulted in UF membranes with improved hydrophilicity and active self-healing *** results demonstrated that the water contact angle of PVA@5%TiO_(2)/carboxyl-PES UF membrane was 43.1°.Following a 1-h exposure to simulated solar exposure,the water flux recovery ratio increased from 48.16%to 81.03%.Moreover,even after undergoing five cycles of 12-h simulated sunlight exposure,the UF membranes exhibited a consistent retention rate of over 97%,thus fully demonstrating their exceptional self-cleaning,antifouling,and selfhealing *** anticipate that the self-healing reactive UF membrane system will serve as a pioneering and comprehensive solution for the self-cleaning antifouling challenges encountered in UF membranes while also effectively mitigating the aging effects of reactive

关键词： Ultrafiltration membrane Self-cleaning Self-healing Poly(aryl ether sulfone)