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脉冲激光法连续制备纳米钴乙醇溶胶的研究 总被引:10,自引:0,他引:10
纳米钴因其优异的磁性能在磁记录材料 [1]、超顺磁材料 [2 ]、巨磁材料 [3 ]和雷达吸波 [4 ]方面具有重要应用 .金属钴有面心立方、密排六方和非晶态 3种结构 [5] .目前 ,用等离子加热及碳电弧法制备的纳米钴粉基本上都是面心立方结构 [6] .Gibson等 [7]用超声化学方法获得了密 相似文献
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In this work, stable high-saturation magnetization ε-Fe3N magnetic fluid was synthesized successfully by the chemical reaction of iron carbonyl (Fe(CO)5) and ammonia gas (NH3). The experiment results have shown that the reactive conditions, such as the nitriding temperature, the gas flux ratio of Ar1:Ar2:NH3, the reactive time, the content of surfactant and the hole size of the porous plate used, have important effects on the phase composition, the size of magnetic particles, the magnetic properties and the stability of ε-Fe3N magnetic fluid. Also it was found that the synthetic time of stable high saturation magnetization ε-Fe3N magnetic fluid could be shortened by adding n-heptane into the carrier, and the size of ε-Fe3N magnetic particles could be decreased by decreasing the pore size of the porous plate used in our experiment. Finally, stable ε-Fe3N magnetic fluid with the saturation magnetization 1663 Gs and the mean particle size 12 nm was synthesized successfully. 相似文献
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The Inorganic Fullerene-like MoS2 was obtained by a simple precipitation method using the polyethylenegly colas the dispersant,The hydroxylamine hydrochloride as the reductant, and (NH4)2S as the sulfursource. Themorphology and structure of the product were characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and High-resolution Transmission Electron Microscopy (HRTEM). The results suggest that the polyethylene glycol dispersant can be adsorbed on the particle surface of the reaction precursor, amorphous MoS2 powders, to form a relative isolated environment. This isolated environment may induce an obstruct effect which helps the precursor nano-particles transfer to the IF structure in the subsequent calcinations process. 相似文献
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采用温和的水热-热解法, 在一定温度下, 通过调节Na2CO3溶液和可溶性钴盐的摩尔比控制产物的形貌, 得到具有一维结构的水热产物. 以该产物为前驱体制备了具有一维结构的Co3O4多晶. 以六次甲基四胺、尿素等代替Na2CO3溶液作为沉淀剂, 均得到了一维纳米结构的Co3O4, 表明CO2-3在水镁石CoO2层间的嵌入是得到一维结构水热产物的关键. 相似文献
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Xiaofan Yang Zhongquan Charlie Zheng Slawomir Winecki Steve Eckels 《Applied Mathematical Modelling》2013,37(20-21):9052-9062
A computational model for evaluating the performance of nano-material packed-bed filters was developed. The porous effects of the momentum and mass transport within the filter bed were simulated. For the momentum transport, an extended Ergun-type model was employed and the energy loss (pressure drop) along the packed-bed was simulated and compared with measurement. For the mass transport, a bulk adsorption model was developed to study the adsorption process (breakthrough behavior). Various types of porous materials and gas flows were tested in the filter system where the mathematical models used in the porous substrate were implemented and validated by comparing with experimental data and analytical solutions under similar conditions. Good agreements were obtained between experiments and model predictions. 相似文献
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在合适的条件下利用阳极氧化高纯铝片,可以获得多孔结构的氧化铝,其孔径大小和排列方式都很均匀.由于孔的深度不受限制,因此可以制备出孔深很大的多孔氧化铝.这种多孔结构可以用作制备纳米材料的模板.利用0.3mol/L的草酸溶液在40V的直流电压下,采用二步氧化法获得了高质量的氧化铝多孔模板,其典型孔径值为40—70nm,孔间距约110nm,深度可达毫米量级.分析了溶液温度对结果的影响,比较了单步法和两步法获得的样品的多孔结构,认为低温下的二步氧化法可以获得很好的多孔氧化铝模板.
关键词:
纳米材料
多孔氧化铝
二步氧化法 相似文献
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对稀土离子能级的动力学过程进行了数值计算,并对各个能级的布居概率改变进行了分析。发现如果不考虑斯托克斯过程和反斯托克斯过程之间的区别而采用原有声子辅助能量传递理论中相同的计算公式对待两种过程的话,得到的理论计算结果就与我们实验得到的校准的结果不一致,为了能够准确描述反斯托克斯能量传递过程,众所周知的量子喇曼理论相对于经典拉曼理论在斯托克斯与反斯托克斯过程的强度比上所增加的比值系数exp{ΔE/kT}被首次成功地引入来描述反斯托克斯能量传递。在能量传递计算理论中引入该比值系数之后,理论计算结果与实验结果符合的非常好,并且发现该比值系数在对纳米尺度材料的光子学研究探索中会发挥至关重要的作用。 相似文献