Pb／Al属多层膜的红外性能研究

利用紫外-可见-近红外分光光度计和傅立叶红外光谱仪分析了用真空磁控溅射技术制备的Al／Pb金属多层膜的对红外光的吸收、反射和透射．结果表明，在近红外200～2500nm波段，多层膜具有良好的吸波特性，在中红外和远红外波段，多层膜呈现出低反射强吸收效果．     

La3+ 掺杂对 CeO2 红外发射性能的影响研究

随着飞行器飞行速度和发动机燃烧室温度的提高, 金属类隐身涂层材料已无法满足环境使用要求。 CeO2 具有较高熔点、 抗氧化、 较低红外发射率等特点, 被认为是红外隐身应用的候选材料, 但其发射率仍无法满足 高温红外隐身需求。 本文通过固相反应法对 CeO2 进行 La3+ 掺杂改性, 研究掺杂量对 CeO2 粉体红外发射性能的 影响规律。 结果表明, 随着掺杂量从 10 mol% 增加到 30 mol%, 粉体在 3~6 μm 波段的发射率不断降低, 其中 Ce0.7La0.3O2 的红外发射率仅为 0.1。     

稀土发光纳米材料温度监测应用研究进展

温度监测在调控生物体内生理过程和研究纳米尺度的微观热效应中扮演重要角色。光学纳米温度探针灵敏度高、空间分辨率高，稀土发光测温作为一种非侵入性的温度监测方式已经引起广泛的关注。稀土发光材料具有超高的光稳定性和可调节的多波段发射的优点，是一种极具潜力的光学纳米探针。本文概述了用于体内温度监测的稀土纳米复合材料的最新研究进展，构建近红外第二或第三光学窗口发射的镧系发光纳米温度探针，提高了成像分辨率以及在生物组织中的穿透深度，拓宽了其在体内潜在的生物应用。     

室温固相合成纳米硫化锌及其性能研究

用醋酸锌和硫化钠为原料，室温固相法合成纳米ZnS，用紫外吸收光谱，红外光谱，X-ray衍射分析(XRD)，透射电镜(TEM)对产物结构、组成、大小、形貌进行表征。结果表明在加入一定量的分散剂后，制备的纳米硫化锌粒子的平均粒径约20nm，分散性好。晶相单一,属于立方晶系。在紫外吸收光谱中纳米硫化锌吸收峰蓝移，吸收峰从340nm减少到265nm。从红外光谱可知，该粉体无红外吸收峰，具有红外透明性。讨论了不同的分散剂。煅烧温度等条件对硫化锌粒度的影响。少量硫化锌作为助燃剂添加到重油-煤-水三元混合流体燃料中，明显提高了重油-煤-水三元混合流体燃料燃烧性能。     

Pb/Al金属多层膜的红外性能研究

利用紫外-可见-近红外分光光度计和傅立叶红外光谱仪分析了用真空磁控溅射技术制备的A1/Pb金属多层膜的对红外光的吸收、反射和透射.结果表明,在近红外200-2500 nm波段,多层膜具有良好的吸波特性,在中红外和远红外波段,多层膜呈现出低反射强吸收效果.     

行业动态

钢铁研究总院四室两项科技成果荣获国际发明金奖冶金工业部钢铁研究总院粉末冶金研究室在电磁波防护材料及抗紫外线辐射材料等高新技术领域的研究中，经过多年艰苦努力和深入探讨，攻克了种种技术难关，取得了多项突破性进展，获得了多项重大科技成果和“超微粒子微波吸收材料及其制造工艺”、“毫米波隐身涂料”、“双功能隐身涂料”、“抗紫外线功能织物”等多项授权发明专利。1996年10月24日至27日，在新加坡世界贸易中心举行了“第一届国际企业创新科技专利技术及发明展览会”。钢铁研究总院从近年来该院的高新技术、专利及产品中选出技…     

纳米YVO4:Ln(Ln=Eu,Tm,Dy)发光粉的研制及与相应块体发光粉的光谱对比

采用络合溶胶—凝胶法合成出3种YVO4∶Ln(Ln=Eu,Tm,Dy)纳米发光粉,并且对纳米YVO4∶Ln与自合成的块体YVO4∶Ln的红外光谱(FTIR),荧光光谱和X-射线衍射以及粒径的分布进行了对比研究。实验结果证明,当钒基稀土发光材料粒径达到纳米级以后,由于纳米粒子的一些特性,导致发光材料的光谱与块体材料相比有了较大的不同,出现了不同程度的蓝移现象。并且纳米发光材料的发光强度较块体发光材料的强度有一定程度的增强。     

纳米YVO4:Ln(Ln=Eu,Tm,Dy)发光粉的研制及与相应块体发光粉的光谱对比

采用络合溶胶-凝胶法合成出3种YVO4∶Ln(Ln= Eu,Tm,Dy)纳米发光粉,并且对纳米YVO4∶Ln与自合成的块体YVO4∶Ln的红外光谱(FTIR),荧光光谱和X-射线衍射以及粒径的分布进行了对比研究.实验结果证明,当钒基稀土发光材料粒径达到纳米级以后,由于纳米粒子的一些特性,导致发光材料的光谱与块体材料相比有了较大的不同,出现了不同程度的蓝移现象.并且纳米发光材料的发光强度较块体发光材料的强度有一定程度的增强.     

红外隐身涂层材料及技术研究进展

随着红外探测技术的不断进步, 以红外辐射为信号源的武器装备（红外夜视仪、 红外制导导弹等） 的识别、 探测和追踪能力越来越强, 使战斗机、 车辆和坦克等武器装备极易受到攻击甚至摧毁。 为了应对这些红外威胁, 提高武器装备在战场上的生存能力, 多种技术手段被研发和应用, 其中红外隐身涂层发挥着越来越重要的作用。 本文将简单介绍红外隐身涂层的工作原理, 从涂层材料和制备技术两个方面综述目前红外隐身涂层的研究进展, 并对其未来研究发展方向提出展望。     

华中科技大学在稀土上转换发光材料研究取得重要研究进展

正近期,华中科技大学材料学院材料成形与模具技术国家重点实验室新材料与器件研究中心团队与中国科学院化学研究所在《自然·通讯》(Nature Communications)上合作发表了关于稀土上转换发光材料的最新研究成果"Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles"(通过界面能量传递增强强多层结构纳米粒子的多光子上转换发光)。该工作由材料学院马颖教授团队、中国科学院化学研究所姚建年院士、张闯研究员以及中国科学院高能物理研究所谷战军研究员合作完成。     

稀土掺杂纳米二氧化钛接枝聚硅氧烷电流变液的制备与性能研究

采用水热合成法制备稀土掺杂金红石型纳米二氧化钛,并通过XRD,TEM等对其进行了表征。结果表明,稀土离子的掺杂使得二氧化钛(110)晶面衍射峰位置发生了漂移,并且出现了不同程度的宽化,但并没有改变纳米TiO2的晶型,也没有出现稀土氧化物的特征衍射峰。稀土掺杂后的二氧化钛形貌为棒状,长径比约为110 nm∶20 nm。利用硅烷偶联剂KH-570对稀土掺杂纳米TiO2表面修饰,与乙烯硅油发生接枝反应制备新型电流变液,并通过旋转流变仪测试了该电流变液的稳态电流变性能。通过红外吸收光谱发现,乙烯基硅油与KH-570-TiO2发生了一定程度的接枝共聚反应。由于无机纳米粒子与聚硅氧烷连续相形成化学键体系,电流变液的抗沉降稳定性得到了很大的提高;稀土离子的掺杂增大了体系的极性,随着电场强度的增大,电流变液的线性平台区也随之变长,表现出典型的类固态响应行为,其中以Sm3+的掺杂效果最为显著。     

Influence of Composition of Sm2O3-Containing Rare Earth Glass on Its Absorption Spectrum

Lanthanidemetalsarethe 5 7thto 71thelementsintheperiodictable ,thetrivalentionsforlanthanideareofvalenceelectronshell 4f0～ 14 6s2 ,whicharefairlystablewhenthe 4felectronsub layerisemptyoral mostempty ,halffullorfull .Becauseofbigenergydifferencebetweenba…     

Development of steel plate for large-heat input welding by nanometer precipitates

The mechanism of the improvement of heat affected zone(HAZ) toughness with nanometer precipitates is discussed in this paper.The austenite grain growth during welding process can be effectively prevented with the aid of the pinning effect of fine particles,so that the steel plate can be improved in large-heat input welding performance.The oxide metallurgy technology with strong deoxidizers is developed in Baosteel.Large number of nanometer precipitates are formed during deoxidation,solidification and phase transformation processes.With the pinning effect of these fine particles,after welding with large-heat input of 400 kJ/cm,the average austenite grain size is 61μm in HAZ,the average energy absorbed value is 142 J for V-notch Charpy test at - 20℃.     

Study on Adsorption Behavior of Rare Earth Complexes on Nanometer-Size Titanium Dioxide with ICP-AES

Inrecentyears ,rareearthelements (REEs)havebeenwidelyusedinfunctionalmaterials ,cata lystsandotherproductsinindustry ,diagnosisreagentsofmagneticresonanceimaging (MRI)inmedicineandsomefertilizersinagricultureespeciallyinChina .However,asaresultoftheirusage ,moreandmoreREEsaregettingintotheenvironment,andalsointohumanbodyviafoodchain[1,2 ] .Itisnotclearwhetherrareearthelementsareessentialforman ,soitisveryurgenttostudythebiologicaleffectofrareearthelementsinhumanhealthandenvironment .Inthes…     

Review on Rare Earth／Polymer Composite

The epecial properties of rare earth/polymer composite were described.More emphasis was put on the radiation shielding and magnetic properties,In the application to X-ray shielding,rare earth/polymer composite can make up the feeble absorbing area.If the rare earth content is high enough,it can demonstrate strong ability for thermal neutron absorption,The composite has strong paramagnetism.The feasibility of preparing magnetic rare earth/polymer compostite was discussed,In addition,three preparation methods were introducde:simlle polymerization,mixing and reaction processing,The effect of the rare earth/polymer composties pre-sturcture and the coordinate number of rare eatrh ions on the light property was analyzed,Rare earth/polmer compostie may have the structure and property simlar to those of the ionomer,The feasibility of the in-situ preparation of the rare earth/polymer nano structure is indicated ,Besides,the relationship between struchture and properties of the rare earth/polymer composite was discussed,The problems associated with such composite materials were also presented.     

Infrared Laser Pumped Green and Blue Laser Emissions from a Single Solid State Material Doped by Rare Earth ions

The possible ways and progress of infrared or red laser pumped green and blue laser emissions from a single solid state material doped by rare earth ions are outlined. The green and blue lasers realized from infrared laser pumped rare earth doped nonlinear laser crystals by means of self-frequency-conversion and from infrared laser pumped rare earth-doped bulk, fiber and microsphere materials by means of frequency upconversion are introduced in detail. Other kinds of devices and methods are also compared. The typical nonlinear laser crystals such as YA13(BO3)4, GdA13(BO3)4, YCa4O(BO3)3,GdCa4O(BO3)3, and the typical upconversion fluoride fibers are compared and analyzed. The major problems remaining to be solved and the developing trends in the area are also discussed.     

Progress of Separation and Determination Methods for Rare Earth Elements

~~Progress of Separation and Determination Methods for Rare Earth Elements     

纳米氧化铈粉体的制备技术研究进展

介绍了近年来国内外纳米氧化铈制备技术的研究情况,重点介绍了液相法的多种制备方法和特点,并对纳米氧化铈的制备技术和发展趋势进行了展望。     

Study on Preparation and Property of Poly－Aminosilicone－Rare Earth Composite

The poly-aminosilicone-rare earth composite was prepared by poly-aminosilicone cross-linked with rare earth and active silanol. The thermal stability of the composites was studied by thermogravimetric analysis (TG). Force condition of the composites in electric field was analyzed and relative polarizability was derived. It is found that the composites containing different rare earth ions have different relative polarizability. The experiment results reveal that organosilicon materials with different electrical performance can be obtained by this way. Meanwhile, the absorption and flourescene spectrum of composites were also investigated. Compared to rare earth chloride, the spectrum properties of the composite are changed obviously. The possible reasons for these phenomena were discussed.     

电池正极材料纳米氢氧化镍的制备新进展

综述了电池正极材料纳米氢氧化镍的几种制备方法及其工艺条件和主要特点，描述了纳米氢氧化镍的结构特征及电化学性能，探讨了转化温度、表面活性剂、反应物浓度以及硝酸根离子对形成纳米氢氧化镍颗粒尺寸与形貌的影响，指出纳米氢氧化镍作为电池正极材料具有光明的前景，但对生产技术还需进一步研究。