羰基铁粉/锶铁氧体/MVQ吸波复合材料的制备与性能研究

以羰基铁粉与锶铁氧体为吸波填料制备羰基铁粉/锶铁氧体/甲基乙烯基硅橡胶(MVQ)吸波复合材料,研究羰基铁粉/锶铁氧体并用比对羰基铁粉/锶铁氧体/MVQ吸波复合材料性能的影响。结果表明,羰基铁粉/锶铁氧体/MVQ复合材料吸波峰处于羰基铁粉/MVQ和锶铁氧体/MVQ复合材料之间,在填料总体积分数不变的前提下,随着羰基铁粉用量的减小,复合材料吸波峰小于-10 dB的带宽先增大后减小、吸波峰向高频方向移动、拉伸强度和拉断伸长率变化不大、压缩永久变形减小、动态性能提高。     

羰基铁粉/天然橡胶磁流变弹性体的结构与性能

研究了羰基铁粉含量和硫化温度对天然橡胶基磁流变弹性体（MRE）结构和性能的影响。结果表明,随着羰基铁粉用量的增加,MRE的交联密度降低,硫化速率提高,硫化胶的拉伸强度和扯断伸长率明显下降,胶料的热稳定性提高;随着硫化温度的升高,MRE的焦烧时间缩短,硫化返原现象严重,128℃下制备的MRE中羰基铁粉的链状结构最为明显,143℃下则不呈链状结构;在硫化温度128℃、羰基铁粉用量为60份时,制得的MRE的磁流变效应最高,达到48.9%。     

定向集热治疗肿瘤医用交变磁场下羰基铁粉的发热性能研究

研究了羰基铁粉热处理前后的微观结构、磁性能以及二者在定向集热治疗肿瘤医用交变磁场下的发热性能,羰基铁粉经过热处理后在外部交变磁场作用下的发热性能明显提高.随着经过热处理的羰基铁粉用量的增大,能够达到的最高温度也随之增大,短时间内就能达到有效杀伤肿瘤细胞的温度,经过热处理后的羰基铁粉是定向集热治疗肿瘤的一种理想候选热籽材料,羰基铁粉在外部交变磁场作用下的发热主要来自磁滞损耗和奈尔松弛.     

涤纶织物化学复合镀Ni-Fe-Co-P/TiO2纳米微粒的研究

采用化学复合镀技术在涤纶织物表面制备Ni-Fe-Co-P/TiO2复合镀层,讨论了TiO2纳米微粒的质量浓度对镀层形貌、成分及晶体结构的影响,确定其质量浓度在4～6 g/L时,镀液稳定,镀层形貌较好.对Ni-Fe-Co-P/TiO2纳米微粒复合镀层的电磁波屏蔽效能和红外发射率进行了测试.结果表明:在20～1 500 M...     

聚硫密封剂与羰基铁粉相容性改善研究

羰基铁粉作为填料加入到聚硫生胶中,可制备具有电磁吸收功能的密封剂.聚硫生胶与填料的相容性是影响吸波密封剂工艺性能与力学性能的重要因素.本研究通过扫描电镜和力学性能、工艺性能的测试,比较不同形貌羰基铁粉对密封剂的性能影响,并采用硅烷偶联剂对铁粉的表面进行改性,改善聚硫生胶与羰基铁粉之间的相容性,实现对吸波密封剂的力学性能...     

超细陶瓷粉及铁粉的表面化学包覆改性的研究

本语文根据化学电镀原理,采用的化学镀液,分别研究了超细铁氧体粉末和陶次 粉的表面化学镀层工艺。并采用电镀、能谱分析和俄歇能谱对粉体包覆层的结构均匀性、厚度及化学元素变化进行了详细的分析。通过表面处理,可降低粉体的红外发射率,所获得的粉体同时具有雷达吸波性和红外隐身性,可用于宽波段隐身材料。     

中压法羰基铁粉中试通过鉴定

近日，由中科院兰州化学物理研究所羰基合成与选择氧化国家重点实验室和吉林吉恩镍业股份有限公司合作完成的中压法羰基铁粉生产技术中试研究项目，通过吉林省科技厅组织的成果鉴定。该项目的实施，将为羰基铁粉合成技术带来质的飞跃，大力推动羰基铁粉产业的快速发展。     

NR/SBR并用橡胶基磁敏橡胶的制备及性能的研究

通过湿法预处理,用偶联剂KH-570对羰基铁粉进行表面改性,制备了综合性能较好的并用橡胶基实用型磁敏橡胶,研究了羰基铁粉含量对天然橡胶/丁苯橡胶(NR/SBR)并用橡胶基磁敏橡胶性能的影响;同时利用扫描电镜研究了改性羰基铁粉表面和磁敏橡胶复合材料断面的微观结构。结果表明,通过偶联剂改性的羰基铁粉其晶体结构未发生变化,且表面有一层致密的包覆层;以NR/SBR并用橡胶为基体的磁敏橡胶,当羰基铁粉用量为300份时,可表现出较好的机械性能和磁流变效应。     

水热法制备氧化锌球状粒子及其红外发射性能

以二水合乙酸锌为前驱体,氢氧化钠为矿化剂,并以柠檬酸为改性剂通过水热法制备了氧化锌球状粒子.采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）及粒度分析仪研究了水热处理前后所得粉体的物相组成、粒子形貌以及粒度分布.采用荧光光谱仪及红外辐射率测量仪测量表征了氧化锌粒子的光致发光（PL）性能及试样的远红外发射率.研究表明,水热前后所得粉体均为六方结构的氧化锌,而水热处理后所得粉体粒子形貌为球状粒子.水热处理前后粒子PL显示,水热处理有效改善了氧化锌晶体的完善性,使得粒子晶体缺陷得到改善.同时,红外发射率的结果表明,水热处理前后的粉体在8～14μm区域内的红外发射率区别不大,表明晶体缺陷对红外发射率的影响不大.     

羰基铁粉通过中试鉴定

由中科院兰州化学物理研究所羰基合成与选择氧化国家重点实验室和吉林吉恩镍业股份有限公司合作，完成的中压法羰基铁粉生产技术中试研究项目，通过了吉林省科技厅组织的成果鉴定。该项目的实施，将为羰基铁粉生产技术带来质的飞跃，大力推动羰基铁粉产业的快速发展。该技术已在吉林吉恩镍业股份有限公司进行了2000t／a羰基铁粉的工业应用试验，预计2009年能够正常生产。羰基铁粉属功能性填充剂，可用于制备导磁胶粘剂，应用于要求导磁性的粘接及风力发电机的制造。     

Chemically bonded iron carbonyl for magnetic composites based on phthalonitrile polymers

Dicarboxylic acid‐containing 1,3‐benzoxazine was synthesized and chemically bonded on iron carbonyl particles using a post‐coating method. Novel organic–inorganic hybrid magnetic composites were prepared via the interfacial reaction between magnetic phthalonitrile prepolymers and the benzoxazine functional coatings that chemically modified the iron carbonyl particles. The results showed that, compared with pure iron carbonyl particles, the modified particles could cure the phthalonitrile prepolymers efficiently and improve the interfacial compatibility of the functional composites. The magnetic composites with chemically modified particles exhibited stronger magnetism in comparison to composites containing bare particles: the saturation magnetization of the magnetic composites with equal concentration (5 wt%) of Fe(CO)₅ increased from 41.12 to 48.82 emu g^?1. Also, the magnetic composites obtained demonstrated excellent thermal stability up to 500 °C. Copyright © 2010 Society of Chemical Industry     

Preparation of Fe/Al Composites with Enhanced Thermal Properties by Chemical Liquid Deposition Methods

Core‐shell Fe/Al composites were successfully prepared by chemical liquid deposition with iron carbonyl [Fe(CO)₅] as precursor and kerosine as oil phase medium. Scanning electron microscopy (SEM), X‐ray diffractometer (XRD), and simultaneous thermogravimetry‐differential thermal analysis (TG‐DTA) were employed to characterize the samples and assess their thermal properties. The results indicated that the aluminum core was coated compactly by an iron layer and the the oxidation kinetics of the obtained composite powders showed a significant improvement compared to pure aluminum powders. The thermal reactivity of Fe/Al composites with oxygen is obviously higher than those of pure aluminum powders, which means that after coating much more heat can be released in the same temperature range and the heat release happens faster and more concentrated. On the basis of the results, a possible formation of the coating is proposed and a thermal reaction mechanism is also discussed.     

端脂肪氨基聚醚改性环氧树脂的性能研究

用自制的一种既含聚醚柔性链段又含苯脂肪氨基刚性链段的端脂肪氨基聚醚(APPEG)作为固化剂对环氧树脂进行增韧改性。扫描电子显微镜和力学性能测试结果表明,固化剂对环氧树脂具有明显的增强、增韧效果,且改性的环氧树脂胶粘剂具有很好的填充性能,填充比高达50%。与羰基铁粉组成的涂层材料具有优异的力学性能和热稳定性能。     

Carbonyl Iron Particles in Magnetic Cell Sorting

Abstract

Iron-dextran microspheres are easily and inexpensively made by coating uniformly sized carbonyl iron particles with dextran. The iron-dextran spheres can be conjugated with a variety of ligands (antibodies, lectins, avidin, etc.) and used with a permanent rare earth magnet to remove cells, organelles, or macromolecules from mixtures and suspensions. The spheres can be stored indefinitely for use when they are needed. Results obtained with iron-dextran particles in magnetic cell sorting are comparable to those with commercial products. They are particularly helpful when large numbers of cells are to be sorted or when a large panel of antibodies is needed.     

煤制合成气中羰基镍和羰基铁的测定

煤制天然气过程中产生的羰基镍、羰基铁可对甲烷化催化剂造成不可逆的中毒反应。氯化碘甲醇溶液(碘、氢碘酸、盐酸和甲醇的混合溶液)可同时吸收合成气中的羰基镍和羰基铁,再利用石墨炉原子吸收光谱仪测定羰基镍和羰基铁含量。通过该方法测定出合成气中羰基镍的含量约为0.025 mg/L,羰基铁的含量小于0.001 mg/L。吸收液中碘浓度为6.0 g/L,氢碘酸浓度为100 mL/L最宜。羰基化合物总含量较低,不会使甲烷化催化剂中毒;在取样和测定过程中应注意个人防护,防止甲醇或CO中毒。     

Direct Coal Liquefaction Using Iron Carbonyl Powder Catalyst

Direct coal liquefaction involves catalyzed interactions between molecular hydrogen and coal‐oil slurries at elevated pressure and temperature, typically in the presence of an iron‐based catalyst. Iron carbonyl powder as an alternative first‐stage catalyst was investigated. A series of experimental tests under mild liquefaction conditions were carried out with a high‐pressure batch reactor in order to compare the performance of the iron carbonyl precursor to the traditional superfine iron oxide catalyst. The carbonyl iron powder performed very well in terms of total conversion of coal as well as yield of coal oil product. The iron carbonyl powder acts as an effective precursor for the in situ generation of active iron sulfide. The simple kinetic models for coal liquefaction in the literature were found to be qualitatively consistent with the yields of preasphaltenes, asphaltenes, and oils obtained from the experiments.     

电沉积Ni-Fe-P非晶态合金镀层变温晶化的研究

用差热分析的方法研究了电沉积Ｎｉ－Ｆｅ－Ｐ非晶态合金镀层的变温晶化过程。通过实验得出不同铁含量的Ｎｉ－Ｆｅ－Ｐ合金在不同加热速度下的开始晶化温度、结束晶化温度,并计算出其晶化激活能。对不同Ｆｅ含量镀层的晶化激活能进行比较发现,Ｆｅ元素在Ｎｉ－Ｆｅ－Ｐ合金镀层中具有稳定非晶态组织的作用。     

胜利100B沥青老化过程中官能团分析与相对分子质量分布

:利用红外光谱 (窗片涂膜法和溶液法 )与凝胶色谱分别定量测定了胜利 10 0B道路沥青老化过程中羰基、亚砜官能团与相对分子质量分布的变化情况。老化的结果是羰基吸收面积逐渐增加 ,亚砜变化较小。两种IR分析方法得到类似的变化趋势 ,但红外窗片涂膜法具有快速、简便的优点。老化之后平均相对分子质量显著增大。这种变化可能是由于极性分子团之间缔合作用的结果     

In Situ Dynamic Measurement of Polydisperse Chain Aggregate Aerosols Using Photocorrelation Spectroscopy Technique

An experimental technique was developed to perform in situ photo correlation spectroscopy measurements on length distribution of dynamic polydisperse iron oxide aerosols with diameters ranging from 0.01 to 0.05 μm. The cumulant analytical method is used to determine the average length of the chain aggregate. The experimental results show that the average length of the iron oxide aerosols obtained by the photo correlation spectroscopy technique is basically consistent with the results obtained by TEM. Results indicate that the length of the iron oxide samples increases as the liquid carbonyl temperature increases and the gas flow dilution ratio decrease.     

Corrosion stability of polyester coatings on steel pretreated with different iron–phosphate coatings

The influence of steel surface pretreatment with different types of iron–phosphate coatings on the corrosion stability and adhesion characteristics of polyester coatings on steel was investigated. The phosphate coating was chemically deposited either from the simple novel plating bath, or with the addition of NaNO₂, as an accelerator in the plating bath. The morphology of phosphate coatings was investigated using atomic force microscopy (AFM). The corrosion stability of polyester coatings on steel pretreated by iron–phosphate coatings was investigated by electrochemical impedance spectroscopy (EIS) in 3% NaCl solution, while “dry” and “wet” adhesion were measured by a direct pull-off standardized procedure. It was shown that greater values of pore resistance, R_p, and smaller values of coating capacitance of polyester coating, C_c, on steel pretreated with iron–phosphate coating were obtained, as compared to polyester coating on steel phosphated with accelerator, and on the bare steel. The surface roughness of phosphate coating deposited on steel from the bath without accelerator is favorable in forming stronger bonds with polyester coating. Namely, the dry and wet adhesion measurements are in accordance with EIS measurements in 3% NaCl solution, i.e. lower adhesion values were obtained for polyester coating on steel phosphated with accelerator and on the bare steel, while the iron–phosphate pretreatment from the novel bath enhanced the adhesion of polyester coating on steel.