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Synthesis of size-controlled hollow Fe3O4 nanospheres and their growth mechanism

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Particuology 2020年第2期18卷 16-23页

作者： Lei Shi Yurong He Yanwei Hu Xinzhi Wang baocheng jiang Yimin Huang Heilongjiang Key Laboratory of New Energy Storage Materials and Processes Harbin 150001China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Size-controlled hollow Fe3O4 nanospheres were synthesized via a one-pot hydrothermal method as a function of reaction time and sodium citrate,polyacrylamide,and urea *** characterization techniques such as scanning and transmission electron microscopy and Raman spectroscopy were employed to investigate the crystal structure and morphology of the obtained *** Fe3O4 nanosphere formation mechanism was elucidated from analyzing the characterization *** levels of sodium citrate and longer reaction times were observed to increase the diameter of the nanospheres until hollow structures ***,polyacrylamide and urea promoted the formation of hollow *** hollow-structured Fe3O4 nanospheres exhibited high magnetization saturation values in the range of 48.8-58.7 emu/*** facile synthesis method described herein,to generate size-controlled Fe3O4 nanospheres with tailored properties,demonstrates potential across a wide range of fields from drug-delivery and stealth devices,to environmental and energy applications.

关键词： Fe3O4 nanoparticles Sphere size Magnetic properties

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涡流贫化法回收铜渣中的金、银、铜

稀有金属材料与工程 2021年第9期50卷 3417-3421页

作者：王坤刘燕姜保成张廷安东北大学多金属共生矿生态化冶金教育部重点实验室辽宁沈阳110819

采用熔融铜渣为原料,经过涡流贫化过程,回收铜渣中的金、银、铜,贫化渣进一步升温还原得到含铜铁水,最终可制备成耐磨铸铁。结果表明,通过涡流贫化,铜渣中的Fe_(3)O_(4)被还原为FeO,然后FeO与SiO_(2)结合,生成Fe_(2)SiO_(4)。经过涡流... 详细信息

采用熔融铜渣为原料,经过涡流贫化过程,回收铜渣中的金、银、铜,贫化渣进一步升温还原得到含铜铁水,最终可制备成耐磨铸铁。结果表明,通过涡流贫化,铜渣中的Fe_(3)O_(4)被还原为FeO,然后FeO与SiO_(2)结合,生成Fe_(2)SiO_(4)。经过涡流贫化后,金、银、铜的回收率分别达到了99.44%、93.97%和93.14%。贫化渣中Fe_(3)O_(4)和铜的含量分别为1.53%和0.61%(质量分数)。贫化渣涡流还原后得到的含铜铁水制备的耐磨铸铁成分满足高铬耐磨铸铁国标要求。

关键词：铜渣涡流贫化 Fe_(3)O_(4)还原

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负载型铂族金属催化剂研究进展

贵金属 2018年第A1期39卷 126-130页

作者：姜保成姜澜东北大学冶金学院沈阳110819

负载型铂族金属催化剂具有优良的催化性能,对化工、环保、生物等领域发展影响显著。综述了适用于负载型铂族金属催化剂的各种载体材料(金属氧化物、沸石分子筛、炭材料、其他材料)及其优点,对催化剂制备工艺的发展趋势(单金属→双金属... 详细信息

负载型铂族金属催化剂具有优良的催化性能,对化工、环保、生物等领域发展影响显著。综述了适用于负载型铂族金属催化剂的各种载体材料(金属氧化物、沸石分子筛、炭材料、其他材料)及其优点,对催化剂制备工艺的发展趋势(单金属→双金属→复杂工艺)进行介绍,并对回收技术(分离载体、分离铂族金属、整体处理)进行讨论,着力提高催化剂的效率和铂族金属的利用率。

关键词：催化剂铂族金属制备回收

PVTx Study of Binary System R22/R152a with Burnett Method

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Journal of Thermal Science 1994年第2期3卷 77-81页

作者： Su Zhijun jiang baocheng Yan Jialu(Dept. of Power Eng., Harbin Institute of Technology, Harbin, 150001, China)Zhu Mingshan Han Lizhong Fu Yidong(Dept. of Thermal Eng., Tsinghua University, Beijing, 100084, China) Dept. of Power Eng. Harbin Institute of Technology Harbin China Dept. of Thermal Eng. Tsinghua University Beijing China

This paper reports the PVTx properties of R22/R152a system in the ranges of temperature from 298.15 K to 353.15 K and pressure from 0.288 MPa to 1.288 MPa. Sixty seven PVTx measurements for three compositions, i.e., 0.2712, 0.4094 and 0.7911 mole fraction of R22, have been measured along 16 isotherms. The uncertainties of temperature and pressure measurements are less than 0.01 K and ±500 Pa respectively. The reliability of the experimental measurements is confirmed by using REFPROP program, a computer program suggested by Morrison et al[4].

关键词： PVTx properties R22/R152a binary system Burnett method refrigerant alternatives.

两排氧枪角度设置对大型底吹炉流动特性的影响

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中南大学学报（自然科学版） 2023年第11期54卷 4250-4262页

作者：郭学益姜保成王亲猛王松松中南大学冶金与环境学院湖南长沙410083

在不同氧枪倾角和角度间距下,建立氧气底吹炉仿真模型,分析不同工况对熔体流动特性的影响。研究结果表明:两排氧枪角度设置对底吹炉内流动特性的影响主要体现在炉径方向。氧枪倾角会对核心搅拌区的空间位置产生“偏移”作用,控制核心反... 详细信息

在不同氧枪倾角和角度间距下,建立氧气底吹炉仿真模型,分析不同工况对熔体流动特性的影响。研究结果表明:两排氧枪角度设置对底吹炉内流动特性的影响主要体现在炉径方向。氧枪倾角会对核心搅拌区的空间位置产生“偏移”作用,控制核心反应区向氧枪所在一侧炉壁偏移程度;角度间距会对核心搅拌区的扰动状态产生“分散”作用,控制搅拌源形成的核心搅拌区聚散程度。为了更好地调控大型底吹炉熔池气动搅拌特性,将两排氧枪角度设置为0°&15°组合较为合理,熔池内有较好的气动搅拌强度和气体分散效果,进而提高熔炼效率,且未产生熔体恶性喷溅。

关键词：大型底吹炉多相流氧枪设置数值模拟

PVTxSTUDYOFBINARYSYSTEMR22／R152aWITHBURNETTMETHOD

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Journal of Shanghai Jiaotong university(Science) 1996年第1期1卷 7-11页

作者： Su Zhijun jiang baocheng Yan Jialu (Shanghai Jiaotong University) (Harbin Institute of Technology) Zhu Mingshan Han Lizhong Fu Yidong (Tsinghua University)

This paper reports the PVT x properties of R22/R152a system in the ranges of temperature from 298.15K to 353.15K and pressure from 0.288 MPa to 1.288 MPa. Sixty seven PVT x measurements for three compositions, i.e., 0.2712, 0.4094 and 0.7911 mole fraction of R22, have been measured along 16 isotherms. The uncertainties of temperature and pressure measurements are less than ±0.01K and ±500 Pa respectively. The reliability of the experimental measurements is confirmed by the CSD equation.

关键词： PVT x properties R22/R152a binary system Burnett method refrigerant alternatives

Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO_(2) Power System

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Journal of Thermal Science 2024年第3期33卷 1132-1147页

作者： jiang Tao LI Mingjia Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

Printed circuit heat exchanger(PCHE)has been widely used in supercritical carbon dioxide(S-CO_(2))power systems because of its high heat transfer efficiency and good ***,due to the large variety of PCHE configurations,channel selection in practical applications lacks a ***,this paper discussed the heat transfer and friction characteristics and the synergy of three fields in the channel under the guidance of the field synergy principle for four typical PCHE ***,the comprehensive performance of four channels was ***,the heat transfer and friction factor correlations for S-CO_(2)in four channels were *** findings demonstrate that the synergy of velocity and pressure fields of the straight channel PCHE is better(β≈180°),so its resistance loss is relatively *** zigzag and sinusoidal wavy channels and the airfoil fins can reduce the angle a between the temperature gradient and velocity,thus enhancing the heat *** sinusoidal wavy channel can reduce flow resistance compared to the zigzag channel due to the rounded *** streamlined airfoil structure can guide the flow and reduce backflow,thus reducing resistance *** the range of Re studied in this paper,the maximum error of the proposed heat transfer and friction factor correlations of PCHE is 7.0%,which shows good fitting *** research in this paper can provide a reference for the selection and design of PCHE with different channel configurations.

关键词： printed circuit heat exchanger supercritical carbon dioxide typical channel structure field synergy analysis

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： Yang jiang Ming Cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination

Co/CoO heterojunction rich in oxygen vacancies introduced by O2 plasma embedded in mesoporous walls of carbon nanoboxes covered with carbon nanotubes for rechargeable zinc-air battery

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Carbon Energy 2024年第7期6卷 14-25页

作者： Leijun Ye Weiheng Chen Zhong-Jie jiang Zhongqing jiang Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhouChina Department of Mechanical Engineering Ningbo University of TechnologyNingboChina Guangzhou Key Laboratory for Surface Chemistry of Energy Materials Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhouChina

Herein,Co/CoO heterojunction nanoparticles(NPs)rich in oxygen vacancies embedded in mesoporous walls of nitrogen-doped hollow carbon nanoboxes coupled with nitrogen-doped carbon nanotubes(P-Co/CoOV@NHCNB@NCNT)are well designed through zeolite-imidazole framework(ZIF-67)carbonization,chemical vapor deposition,and O_(2) plasma *** a result,the threedimensional NHCNBs coupled with NCNTs and unique heterojunction with rich oxygen vacancies reduce the charge transport resistance and accelerate the catalytic reaction rate of the P-Co/CoOV@NHCNB@NCNT,and they display exceedingly good electrocatalytic performance for oxygen reduction reaction(ORR,halfwave potential[EORR,1/2=0.855 V *** hydrogen electrode])and oxygen evolution reaction(OER,overpotential(η_(OER,10)=377mV@10mA cm^(−2)),which exceeds that of the commercial Pt/C+RuO_(2) and most of the formerly reported ***,both the aqueous and flexible foldable all-solid-state rechargeable zinc-air batteries(ZABs)assembled with the P-Co/CoOV@NHCNB@NCNT catalyst reveal a large maximum power density and outstanding long-term cycling ***-principles density functional theory calculations show that the formation of heterojunctions and oxygen vacancies enhances conductivity,reduces reaction energy barriers,and accelerates reaction kinetics *** work opens up a new avenue for the facile construction of highly active,structurally stable,and cost-effective bifunctional catalysts for ZABs.

关键词： heterojunction oxygen evolution/reduction reaction oxygen vacancies rechargeable zinc–air battery three‐dimensional nitrogen‐doped hollow carbon nanoboxes