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Structural and microwave absorption properties of CoFe_(2)O_(4)/residual carbon composites

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 221-232页

作者： Yuanchun Zhang Shengtao gao Xingzhao Zhang Dacheng Ma chuanlei Zhu Jun He Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining Anhui University of Science and TechnologyHuainan 232001China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

Electromagnetic interference,which necessitates the rapid advancement of substances with exceptional capabilities for bsorbing electromagnetic waves,is of urgent concern in contemporary *** this work,CoFe_(2)O_(4)/residual carbon from coal gasification fine slag(CFO/RC)composites were created using a novel hydrothermal *** mechanisms for microwave absorption,including conductive loss,natural resonance,interfacial dipole polarization,and magnetic flux loss,are involved in these ***,compared with pure residual carbon materials,this composite offers superior capabilities in microwave *** 7.76GHz,the CFO/RC-2 composite achieves an impressive minimum reflection loss(RL_(min))of-43.99 dB with a thickness of 2.44 ***,CFO/RC-3 demonstrates an effective absorption bandwidth(EAB)of up to 4.16 GHz,accompanied by a thickness of *** study revealed the remarkable capability of the composite to diminish electromagnetic waves,providing a new generation method for microwave absorbing materials of superior quality.

关键词： coal gasification slag residual carbon hydrothermal method microwave absorption CoFe_(2)O_(4)

碳纳米管负载CuO-CeO_2催化剂用于CO选择性氧化

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工业催化 2017年第9期25卷 18-23页

作者：张果坚增运士丽敏高传磊西安工业大学材料与化工学院陕西西安710021

分别以碳纳米管(CNTs)和68%浓HNO3处理的CNTs为载体,采用超声辅助的浸渍法制备负载型Cu O-CeO_2复合氧化物催化剂,用于富氢气中CO选择氧化。采用XPS和LRS对预处理前后CNTs管的结构与表面性质进行研究。采用XRD和H2-TPR对催化剂结构进行... 详细信息

分别以碳纳米管(CNTs)和68%浓HNO3处理的CNTs为载体,采用超声辅助的浸渍法制备负载型Cu O-CeO_2复合氧化物催化剂,用于富氢气中CO选择氧化。采用XPS和LRS对预处理前后CNTs管的结构与表面性质进行研究。采用XRD和H2-TPR对催化剂结构进行表征。结果表明,经浓HNO3处理的CNTs载体表面含氧官能团—COOH相对含量提高了约68%,且表面缺陷增多,有助于催化剂活性组分的沉积和分散。以此负载的Cu O-CeO_2催化剂上Cu O物种具有较好的分散性,晶粒尺寸较小,催化剂表现出强的低温氧化还原能力,且表面CO氧化活性位增多,对CO选择性氧化具有低温高活性,T50低至90℃,反应温度低于140℃保持高选择性,且CO完全转化反应温度窗口拓宽宽至30℃。

关键词：催化化学碳纳米管预处理 CuO-CeO2催化剂 CO选择氧化

One-step synthesis of basic magnesium sulfate whiskers by atmospheric pressure reflux

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Particuology 2016年第1期14卷 191-196页

作者： Xinlong Ma Guoqing Ning chuanlei Qi Jinsen gao State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China

We have developed a one-step process for the synthesis of basic magnesium sulfate （5Mg（OH）2-MgSO4-3H20, abbreviated as 513MOS） whiskers from MgSO4,7H20 and MgO by refluxing at atmospheric pressure. The process shows potential for the low-cost mass production of controlled- structure whiskers. Their 0.3-1.0 μm diameter and 40-80 μm length correspond to an aspect ratio of 40-260. The 513MOS whisker morphology is related closely to MgSO4 concentration and reflux time. The optimized MgSO4 concentration is 1.2-1.5 mol/L with a 25-30 h reflux time. X-ray diffractometry revealed that the b-axis is the predominant growth direction of the whiskers. Their growth mechanism is by the relatively slow liquid-phase deposition of Mg2＋, OH-, and SO42-. The long reaction time and high MgSO4 concentration are conducive to the formation of 513MOS whiskers under gentle reaction conditions. Porous MgO whiskers with a fibrous structure were obtained after calcination of the 513MOS whiskers at 1020 ℃.

关键词： Basic magnesium sulfate Whiskers Atmospheric pressure reflux Growth mechanism

Ge_(20)Sb_(15)Se_(65)玻璃的比热容性能研究

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西安工业大学学报 2019年第2期39卷 185-190页

作者：高传磊许军锋刘振亭王霞坚增运西安工业大学陕西省光电功能材料与器件重点实验室西安710021

为解决硫系玻璃在热加工和使用过程的稳定性判断等问题。通过熔融淬冷法制得Ge_(20)Sb_(15)Se_(65)玻璃,利用X射线衍射(XRD)和差示扫描量热仪(DSC)分别分析样品的结构和玻璃的特征温度,采用等温步阶法测定过冷液相和结晶相之间的比热差... 详细信息

为解决硫系玻璃在热加工和使用过程的稳定性判断等问题。通过熔融淬冷法制得Ge_(20)Sb_(15)Se_(65)玻璃,利用X射线衍射(XRD)和差示扫描量热仪(DSC)分别分析样品的结构和玻璃的特征温度,采用等温步阶法测定过冷液相和结晶相之间的比热差,通过比热计算吉布斯自由能和熵变,并绘制熵变曲线。根据Vogel-Fulcher-Tammann (VFT)方程拟合得到理想玻璃化转变温度。研究结果表明:样品的玻璃化转变温度、初始结晶温度和熔点分别为273.9℃、400.5℃和485℃,熔化焓为28.48 J·g^(-1)。拟合的理想玻璃化转变温度T_0为464 K,过冷液相和结晶相之间的比热差ΔC_p为0.096 9 J·K^(-1)·g^(-1)。过冷液相和结晶相之间比热差ΔC_p的测定结果为0.093 3 J·K^(-1)·g^(-1),与理论预测相近。根据熵变曲线图可以确定其Kauzmann温度T_k=506.7 K。

关键词：玻璃比热过冷液相考兹曼温度

Self-assembly with varying hydrophobic centers:Synthesis of red blood cell-like basic magnesium carbonate microspheres

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Particuology 2015年第5期13卷 145-150页

作者： Xinlong Ma Guoqing Ning Bing Chen chuanlei Qi Xingying Lan Jinsen gao State Key Laboratory of Heavy Oil Processing China University of Petroleum

Basic magnesium carbonate microspheres with a red blood cell （RBC）-like appearance and diameters of ~3μm were synthesized by amphiphilic molecule-participated self-assembly under hydrothermal conditions, In the self-assembly, sodium dodecyl benzene sulfonate served as a template for the formation of Mg（OH）2 spherical micelles and also as a reactant precursor that releases CO2 to react with Mg（OH）2. The growth of the microspheres is driven by the continuous generation of new hydrophobic centers because of the consumption of hydrophilic poles （--SO3-）. The surfactant-directed self-assembly can be applied to the synthesis of other carbonate or metallic oxide self-assemblies, indicating that it is a universal self-assembly method for amphiphilic molecules.

关键词： Self-assembly Red blood cell-like Basic magnesium carbonate Microspheres

Exfoliated multi-layered graphene anode with the broadened delithiation voltage plateau below 0.5 V

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Journal of Energy Chemistry 2020年第10期29卷 233-242页

作者： Xinlong Ma Xinyu Song Yushu Tang Enzuo Liu Chenggen Xu chuanlei Qi Yun Li Jinsen gao Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051JiangsuChina School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials Tianjin UniversityTianjin 300072China

The commercial graphite(CG)is the conventional anode material for lithium ion batteries(LIBs)due to its low delithiation voltage plateau(below 0.5 V)and extraordinary ***,the further promotion of energy density of LIBs is restricted by the limited capacity below 0.5 V of ***,based on the supercritical CO2 exfoliation technique,the production of multi-layered graphene(MLG)is achieved from the pilot scale production *** great merit of the exfoliated MLG anode is that the voltage plateau below 0.5 V is broadened obviously as compared to those of natural graphite and ***,no obvious lithium dendrites are observed for MLG during the lithiation *** large delithiation capacity under the low voltage plateau of MLG is mainly benefited from the combination of Li intercalation and boundary storage mechanism,which is further confirmed by the density functional theory *** LiFePO4/MLG full cell can afford the satisfactory electrochemical property with respect to the capacity,energy density and ultralong cycling stability(90%capacity retention after 500 cycles at 2 C),significantly better than that of LiFePO4/***,this developed technique not only dedicates to producing the high-performance anode for LIBs but also opens a door for the mass production of MLG in the industrial scale.

关键词： Multi-layered graphene Supercritical CO2 exfoliation Anode Broadened delithiation voltage plateau Intercalation and boundary storage

Kinetics and Mechanism of Hydration of Acrylic Acid over Ion-exchanged Resin:Experimental Exploration and DFT Calculation

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China Petroleum Processing & Petrochemical Technology 2024年第3期26卷 109-121页

作者： Yang Fengjing Luo Nianjun Chen Yuxiang Liu chuanlei Wang Hao gao Weikang Guo Guanchu Jiang Hao Zhao Qiyue Zhou Yousheng Wang Yifan Li Peicheng Shen Benxian Sun Hui State Key Laboratory of Green Chemical Engineering and Industrial Catalysis East China University of Science and TechnologyShanghai 200237China School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China International Joint Research Center of Green Energy Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Liquid-phase acrylic acid hydration over solid-phase catalysts is a key reaction for the industrial productionof 3-hydroxypropionic acid. However, the relevant literature primarily focuses on the experimental aspects of catalystscreening and exploring reaction conditions, with few accurate descriptions of the reaction kinetics and determination ofthe reaction mechanism. Here, we combined kinetics experiments and theoretical calculations to elucidate the kinetics andmechanism of acrylic acid hydration on a resin catalyst. The pseudo-homogeneous model, and Langmuir-Hinshelwood-Haugen-Watson and Elie-Riedel (ER) heterogeneous models were used to explain the experimental kinetics data. TheER model can explain the experimental data very well, suggesting strong adsorption of acrylic acid on the surface of theresin catalyst. Furthermore, density functional theory calculations show that the hydration follows a stepwise, rather than aconcerted, reaction pathway. The present study provides theoretical insights into the reaction mechanism and kinetics, fillingthe gap in our understanding of the reaction on a fundamental level.

关键词： acrylic acid kinetics resin catalyst DFT method

Reconstructing avascular necrotic femoral head through a bioactiveβ-TCP system:From design to application

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Bioactive Materials 2023年第10期28卷 495-510页

作者： Yajie Lu Xiantao Chen Xiao Lu Changning Sun Minghui Li Guojing Chen Zuoyao Long Yuan gao Haoqiang Zhang Mengquan Huang chuanlei Ji Hongbin Fan Dong Liu Yuewen Hao Hong Wang Leilei Zhang Hongmei Zhang Jianxi Lu Zhen Wang Jing Li Department of Orthopedics Xijing HospitalAir Force Medical UniversityXi’an710032China Department of Clinical Oncology Xijing HospitalAir Force Medical UniversityXi’an710032China The State Key Laboratory of Cancer Biology Biotechnology Center School of PharmacyAir Force Medical UniversityXi’an710032China Department of Osteonecrosis of the Femoral Head Luoyang Orthopedic-Traumatological Hospital of Henan ProvinceLuoyang471002China Shanghai Bio-lu Biomaterials Co. LtdShanghai201100China Shanghai Technology Innovation Center of Orthopedic Biomaterials Shanghai201100China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an710054China National Medical Products Administration(NMPA)Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an710054China Department of Orthopedics General Hospital of Northern Theater CommandShenyang110000China Department of Orthopedics The 940th Hospital of Joint Logistics Support Force of People’s Liberation ArmyLanzhou730000China Department of Medical Imaging Xi’an Children’s HospitalXi’an710000China Department of Medical Imaging Xijing HospitalAir Force Medical UniversityXi’an710032China

A variety of techniques have been used for treating avascular necrosis of the femoral head(ANFH),but have frequently *** this study,we proposed aβ-TCP system for the treatment of ANFH by boosting revascularization and bone *** angio-conductive properties and concurrent osteogenesis of the highly interconnected porousβ-TCP scaffold were revealed and quantified through an in vivo model that simulated the ischemic environment of *** test and finite element analysis showed that the mechanical loss caused by tissue necrosis and surgery was immediately partially compensated after implantation,and the strength of the operated femoral head was adaptively increased and eventually returned to normal bone,along with continuous material degradation and bone *** translational application,we further conducted a multi-center open-label clinical trial to assess the efficacy of theβ-TCP system in treating *** hundred fourteen patients with 246 hips were enrolled for evaluation,and 82.1%of the operated hips survived at a 42.79-month median *** imaging results,hip function,and pain scores were dramatically improved compared to preoperative *** stage II disease outperformed stage III in terms of clinical ***,bio-adaptive reconstruction using theβ-TCP system is a promising hip-preserving strategy for the treatment of ANFH.

关键词： Avascular necrosis of the femoral head β-TCP Vascularization Bone regeneration Clinical trial Bioadaptability

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喷气对相继增压柴油机切出过程影响研究

哈尔滨工程大学学报 2018年第3期39卷 490-495页

作者：高占斌曹灿王贺春杨传雷哈尔滨工程大学动力与能源工程学院黑龙江哈尔滨150001 集美大学轮机工程学院福建厦门361021

为了改善相继增压系统切出过程中柴油机的瞬态性能,在最佳切出延迟时间时进行了切出过程的喷气试验,研究了喷气对柴油机瞬态性能的影响,并对缸内燃烧进行了三维流场计算。研究结果表明:采用了喷气技术后,由于柴油机的进气压力增加,柴油... 详细信息

为了改善相继增压系统切出过程中柴油机的瞬态性能,在最佳切出延迟时间时进行了切出过程的喷气试验,研究了喷气对柴油机瞬态性能的影响,并对缸内燃烧进行了三维流场计算。研究结果表明:采用了喷气技术后,由于柴油机的进气压力增加,柴油机瞬态性能得到了明显改善;转速波动减少了42%,达到稳定转速时气缸工作循环数减少了46%。排放性能也得到了改善,烟度排放量减少约50%,HC排放量减少了约30%,CO排放量减少了约35%,但是NOx排放量增加了约20%。

关键词：喷气柴油机相继增压切出过程瞬态性能排放性能