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Journal of Materiomics 2024年第1期10卷 124-133页

作者： Shaohua Shi Pengpeng Mou Dao wang Xiangying Li Shengjie Teng Maofan Zhou Xiaolong Yu Zhen Deng gengping wan Guizhen wang State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikouHainan570228China Department of Radiology Central South University Xiangya School of Medicine Affiliated Haikou HospitalHaikou570208China College of Science Qiongtai Normal UniversityHaikouHainan571127China Sanya Nanfan Research Institute of Hainan University Hainan Yazhou Bay Seed LaboratorySanya572025China

Electromagnetic pollution and heat dissipation problems are becoming increasingly worthy of attention due to the rapid development of electronic devices,which puts forward an urgent demand for microwave absorbers with excellent thermal management ***,high-performance Co/carbon nanofiber(Co/CNF)microwave absorbers with high thermal conductivity were fabricated by facile step-by-step *** microwave absorption properties can be readily tuned by adjusting the content and size of Co nanoparticles through concentration gradient *** from the formation of dielectric and magnetic coupling network,Co/CNF composites possess intensive dipole polarization,interface polarization,and magnetic *** optimal Co/CNF composites exhibit outstanding microwave absorption performance with a minimum reflection loss(RL)of−53.0 dB at 11.44 GHz,and a maximum effective absorption bandwidth(EAB)of 5.5 *** addition,the thermal conductivities of the Co/CNF-natural rubber(Co/CNF-NR)composites are significantly *** work may inspire the exploration of high-efficiency heat-conduction microwave absorbers based on CNF.

关键词： Carbon nanofiber Co nanoparticle Microwave absorption Heat conductivity

Rationally tailoring interface characteristics of ZnO/amorphous carbon/graphene for heat-conduction microwave absorbers

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Nano Research 2022年第10期15卷 8677-8687页

作者： Maofan Zhou Xuefei Xu gengping wan Pengpeng Mou Shengjie Teng Guizhen wang State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228China

With the increasingly severe electromagnetic interference issue and the huge heat dissipation demand caused by the miniaturized and integrated electronic devices,exploring the heat-conduction microwave absorption(MA)materials is highly desired and remains a great ***,we reported the fabrication of ZnO/amorphous carbon(ZnO/AC)hybrid films covered on the surface of graphene(ZnO/AC/Graphene)to simultaneously apply as the MA and thermal management *** ZnO/AC coatings synthesized with the auxiliary of an atomic layer deposition(ALD)method are highly uniform and controllable,which can significantly improve the MA performance and thermal conduction properties of *** reflection loss(RL)of−55.4 dB and the effective absorption bandwidth of 5.3 GHz were achieved with thickness of 2.0 mm for ZnO/AC/Graphene at a low loading content(3 wt.%).The minimum RL of−57.9 dB can be obtained in the ZnO/AC/Graphene composites at a low frequency(7.8 GHz).Moreover,the absorption frequency can be regulated by changing the ZnO/AC which can be readily implemented by adjusting the ALD cycles of *** thermal conductivity of ZnO/AC/Graphene is up to 257.8 mW·m^(−1)·K^(−1),increased by 53.2%compared with natural *** enhancement mechanisms of microwave loss and heat conduction are systematically studied in *** work not only develops an excellent candidate,but also provides a novel strategy to design functional materials for heat-conduction MA application.

关键词： atomic layer deposition graphene microwave absorption heat conductivity

High densities of magnetic nanoparticles supported on graphene fabricated by atomic layer deposition and their use as efficient synergistic microwave absorbers

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Nano Research 2014年第5期7卷 704-716页

作者： Guizhen wang Zhe Gao gengping wan Shiwei Lin Peng Yang Yong Qin State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China University of Chinese Academy of Sciences Beijing 100039 China Key Laboratory of Chinese Education Ministry for Tropical Biological Resources Hainan University Haikou 570228 China

An atomic layer deposition （ALD） method has been employed to synthesize Fe3O4/graphene and Ni/graphene composites. The structure and microwave absorbing properties of the as-prepared composites are investigated. The surfaces of graphene are densely covered by Fe3O4 or Ni nanoparticles with a narrow size distribution, and the magnetic nanoparticles are well distributed on each graphene sheet without significant conglomeration or large vacancies. The coated graphene materials exhibit remarkably improved electromagnetic （EM） absorption properties compared to the pristine graphene. The optimal reflection loss （RL） reaches -46.4 dB at 15.6 GHz with a thickness of only 1.4 mm for the Fe3O4/graphene composites obtained by applying 100 cycles of Fe2O3 deposition followed by a hydrogen reduction. The enhanced absorption ability arises from the effective impedance matching, multiple interfacial polarization and increased magnetic loss from the added magnetic constituents. Moreover, compared with other recently reported materials, the composites have a lower filling ratio and smaller coating thickness resulting in significantly increased EM absorption properties. This demonstrates that nanoscale surface modification of magnetic particles on graphene by ALD is a very promising way to design lightweight and high-efficiency microwave absorbers.

关键词： atomic layer deposition(ALD) graphene magnetic nanoparticles microwave absorption

Controllable coating NiAl-layered double hydroxides on carbon nanofibers as anticorrosive microwave absorbers

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Journal of Materials Science & Technology 2023年第20期151卷 109-118页

作者： Ying Zhang Liang Li Changlong Du gengping wan Qiyi Wei Xueqing Zhou Yanran Su Yang Xu Guizhen wang State Key Laboratory of Marine Resource Utilization in South China Sea School of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Collaborative Innovation Center of Ecological Civilization Hainan UniversityHaikou 570228China

For harsh real-world service settings,it is essential to build corrosion-resistant,diverse,and effective microwave ***,we successfully prepared a 3D NiAl-layered double hydroxide/carbon nanofibers(NiAl-LDH/CNFs)composite material as an anticorrosive microwave absorber assisted by an atomic layer deposition(ALD)*** size,coating thickness,and content of NiAl-LDH can be readily adjusted by changing the ALD cycling *** optimized NiAl-LDH/CNFs demonstrates prominent microwave absorbing properties including the strongest reflection loss of–55.65 dB and the widest effective absorption bandwidth of 4.80 GHz with only 15 wt%*** reasons for performance improvement are the cooperative effect of interfacial polarization loss,conduction loss,and three-dimensional porous ***,due to the synergistic effects between the excellent impermeability of CNFs and the trapping ability of NiAl-LDH for chloride ions,NiAl-LDH/CNFs exhibits strong corrosion resistances under acidic,neutral,and alkaline ***-LDH/CNFs should be a potential candidate to simultaneously use for microwave absorption and corrosion resistance,and this work provides a certain guiding significance for designing microwave absorbers that satisfy the corrosion resistance.

关键词： Microwave absorption Anticorrosion Atomic layer deposition(ALD) Double layered hydroxides(LDHs) Carbon nanofibers(CNFs)

Tailoring surface features and pore structure by carbon spiral fibers to construct the high-strength carbon foams for the fast and cyclic photo-thermal oil absorption

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Journal of Materials Science & Technology 2023年第19期150卷 190-200页

作者： Shaohua Shi Yulin Tang Guizhen wang Jinchuan Zhao gengping wan Lihong Wu Jieping wang Chul B.Park Guilong wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikouHainan 570228China Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of TorontoTorontoOntario M5S3G8Canada

Two key limitations affecting the commercial application of carbon foams for fast clean-up of varied oils are the complex synthesis process and poor mechanical *** this work,an effective method is reported to fabricate the efficient oil-absorbing materials(CSF@MCF)of carbon spiral fibers(CSFs)anchored on melamine carbon foam(MCF)with superior mechanical properties and excellent photothermal *** interwoven CSFs can not only provide extra rigidity but also reduce the stress concentration of the carbon skeleton,which greatly improves the mechanical properties with 6.3 times maximum compression stress and 4.5 times ultimate tensile strength than *** addition,the pure carbon component can reduce the interface resistance and excite the free electrons more easily,thus realizing high-efficiency photothermal conversion in a wide range of *** light irradiation,the CSF@MCF can be quickly heated up to 70℃and achieve ultra-high absorption of crude oil,up to 62 g g_(-1),due to its low density and large absorption ***,the CSF@MCF exhibits impressive absorption stability with persistent superhydrophobicity and a high recovery efficiency of over 85%.Superadding its simple preparation process,low production cost,and excellent acid-alkali resistance,the CSF@MCF shows great commercial potential for effectively absorbing varied oils.

关键词： Carbon spiral fiber Melamine carbon foam Mechanical enhancement Photothermal conversion Oil absorption

削角双六棱锥多面体氧化铁晶面调控制备及其可见光催化性能(英文)

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电子显微学报 2014年第1期33卷 25-33页

作者：窦智峰曹昌燕陈永万耿平王桂振宋卫国海南大学材料与化工学院热带岛屿资源先进材料教育部重点实验室海南海口570228 中国科学院化学研究所分子纳米结构与纳米技术院重点实验室北京分子科学国家实验室北京100190

采用氟离子辅助的乙醇和水混合溶剂热法制备得到了形貌均一的削角双六棱锥氧化铁多面体微米晶体。调节混合溶剂中乙醇的体积分数可实现对该削角双六棱锥多面体氧化铁暴露晶面的精细调控。通过可见光催化降解RhB染料实验发现,利用该法所... 详细信息

采用氟离子辅助的乙醇和水混合溶剂热法制备得到了形貌均一的削角双六棱锥氧化铁多面体微米晶体。调节混合溶剂中乙醇的体积分数可实现对该削角双六棱锥多面体氧化铁暴露晶面的精细调控。通过可见光催化降解RhB染料实验发现,利用该法所得的各多面体氧化铁对RhB表现出了良好的可见光催化活性,且各削角双六棱锥多面体氧化铁的光催化活性与其形貌之间表现出典型的性质与结构的依赖构效关系。

关键词： α-Fe2O3 溶剂热合成削角多面体晶面调控光催化

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两种计数儿童网织红细胞方法比较

现代医院 2007年第5期7卷 70-71页

作者：梁肖云李文利万根平广州市儿童医院广东广州510120

目的比较XE-2100全自动血液分析仪和人工显微镜法测定儿童网织红细胞的优势。方法对343例病人标本的检测结果进行统计学处理,比较观察。结果两种计数儿童网织红细胞方法无论高、中、低值均无显著性差异,相关性良好,r=0.992。而XE-2100... 详细信息

目的比较XE-2100全自动血液分析仪和人工显微镜法测定儿童网织红细胞的优势。方法对343例病人标本的检测结果进行统计学处理,比较观察。结果两种计数儿童网织红细胞方法无论高、中、低值均无显著性差异,相关性良好,r=0.992。而XE-2100血液分析仪计数高、中、低值网织红细胞的重复性均优于人工显微镜目测计数。结论XE-2100血液分析仪检测RET具有方便、快捷、精密度高、准确性好的、检测参数多、干扰少等优点,能更好地提供相关病情诊断及治疗转归信息;显微镜目测法计数网织红细胞作为一种能直观细胞形态的传统方法应与全自动分析仪相互结合使用,可使实验结果更加准确、科学。

关键词： XE-2100血液分析仪网织红细胞儿童

基质金属蛋白酶-9靶向RNA干扰重组载体的构建和效应检测

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微循环学杂志 2009年第4期19卷 17-21页

作者：顾晓琼万根平陈兆鸿广东省广州市妇女儿童医疗中心邮政编码广州510120

目的:构建针对人基质金属蛋白酶-9(MMP-9)小干扰RNA(siRNA)表达载体,并观察其对川崎病(KD)血清诱导的血管内皮细胞MMP-9高表达的干扰效果。方法:依据siRNA设计原则设计两对MMP-9基因的特异性干扰序列,体外分别合成两端含BamH Ⅰ和Hind ... 详细信息

目的:构建针对人基质金属蛋白酶-9(MMP-9)小干扰RNA(siRNA)表达载体,并观察其对川崎病(KD)血清诱导的血管内皮细胞MMP-9高表达的干扰效果。方法:依据siRNA设计原则设计两对MMP-9基因的特异性干扰序列,体外分别合成两端含BamH Ⅰ和Hind Ⅲ酶切位点的编码短发夹RNA序列的DNA单链,退火后与pSilencer3.1-HI neo线性质粒连接,转化DH5α感受态菌株,筛选阳性克隆,提取质粒进行双酶切及琼脂糖电泳鉴定。阳性重组质粒测序。将构建的两个MMP-9 siRNA质粒以KD血清作为诱导因子,用脂质法转染内皮细胞ECV-304,应用RT-PCR法测定各实验组血管内皮细胞MMP-9mRNA表达、Western blot检测各组MMP-9蛋白表达情况,对所构建的MMP-9 siRNA质粒进行效应检测。结果:DNA测序证实合成的并被克隆入pSilencer3.1-HI neo表达质粒siRNA插入序列与设计完全符合。KD血清组MMP-9蛋白及mRNA表达水平均较正常血清组明显升高(P<0.05);而所构建的两个MMP-9 siRNA及人血丙种球蛋白均能显著抑制KD血清的上述诱导作用(P<0.05)。结论:成功构建的两个MMP-9 siRNA比人血丙种球蛋白更能高效、特异地抑制MMP-9的表达,为进一步研究MMP-9基因对KD冠状动脉病变的影响及其临床应用奠定了基础。

关键词：基质金属蛋白酶-9 RNA干扰重组载体检测靶向冠状动脉扩张川崎病动脉瘤