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41.
运用“交替淬冷快热”法,成功地制备了氧化钕的纳米级均分散胶体粒子,颗粒分散性好,呈规则球形,最小粒径为35nm,纯度999%,详细讨论了“交替淬冷快热”法提出的基本原理,运用DTA/TG的分析结果,确定了产物的煅烧温度及热分解机理,并用XRay衍射对各种温度处理的粉末样品进行了观测和分析。 相似文献
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研究了制备氧化铜均分散的超微粒子的条件,发现pH、阴离子、温度等均与此有关。用不同方法研究了粒子形成过程及内在的化学机理。在实验室条件下,制备出各种形状、大小的氧化铜粒子,从中得到一些规律。 相似文献
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Synthesis of transparent oil dispersion of monodispersed calcium carbonate nanoparticles with high concentration 下载免费PDF全文
Yuan Pu Fang Kang Xiao‐Fei Zeng Jian‐Feng Chen Jie‐Xin Wang 《American Institute of Chemical Engineers》2017,63(9):3663-3669
The preparation of monodispersed inorganic nanoparticles is of great interest for many applications. In this article, transparent oil dispersion of monodispersed amorphous CaCO3 nanoparticles with high concentration and long‐term stability were controllably prepared by a reverse microemulsion method. The effects of the addition amount of extra minute water and (NH4)2CO3 as novel assistant promoter, reaction temperature, Ca(OH)2/CaO mole ratio were explored. The optimum synthesis conditions were achieved. The as‐prepared transparent oil nanodispersion had a good monodispersity, a uniform particle size of 8–10 nm, a high stability of over 12 months, a high solid content of 38 wt% (Ca content of about 15.5 wt%) and a high total base number of 416 mgKOH/g. The preparation process was further investigated by polarized optical microscope and Fourier transform infrared. This nanodispersion will find a promising applicability as an excellent nanodetergent in the fields of automobile and marine lubricants. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3663–3669, 2017 相似文献
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以氯金酸为原料,葡萄糖为还原剂,柠檬酸钠为保护剂,在一定温度条件下成功制备出金纳米粒子,并用透射电镜和紫外-可见分光光度计对实验样品进行了表征,结果表明,此类纳米金粒子尺寸均匀,呈球形单分散分布,发现葡萄糖和柠檬酸钠对粒子尺寸影响较小,性质稳定,具有较高的应用价值。 相似文献
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以Co(NO3)2·6H2O和Co(NO3)2·7C6H13OH为前驱体,采用热分解法制得Co/SiO2催化剂,通过BET、TEM、HRTEM、XPS和TPR等手段进行表征,并对F-T合成反应性能进行了评价。结果表明,浸渍法制备的Co3O4颗粒团聚严重,而热分解法制备的Co3O4颗粒呈球形,单分散状态。与浸渍法制备的催化剂相比,热分解法制备的催化剂孔容较小,表面钴硅原子比较高,钴硅相互作用较强。评价结果表明,热分解法制备的催化剂反应活性低于浸渍法制备的催化剂,但汽油(C5~C11)选择性高,且选择性在前驱体去结晶水后有所增大. 相似文献
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Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics 下载免费PDF全文
Wook Ki Jung Ho Jin Ma Se Woon Jung Do Kyung Kim 《Journal of the American Ceramic Society》2017,100(5):1876-1884
Highly sinterable powders are required for the fabrication of transparent ceramics. Here, we studied the effects of calcination atmosphere on the characteristics of monodispersed spherical Y2O3 powders, such as crystallite size and particle density, for high optical transparent ceramics. It was found that vacuum calcination around the crystallization temperature is the crucial step to eliminate intragranular pores in the spherical particle. The fast decomposition rate in a vacuum creates smaller crystallites, and the following higher calcination temperature results in the enhancement of pore elimination. The in‐line transmittance of the transparent Y2O3 ceramics, vacuum sintered at 1750°C, was improved by increasing the particle density of the as‐calcined powders. This result indicates that the high‐density starting particles effectively enhance the pore elimination during the fabrication of transparent Y2O3 ceramics. 相似文献
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Using the polymerizable hydrophobic styrene monomer as the dispersion medium and the traditional nonionic surfactant OP-10 as emulsifier, stable silver nanoparticles of narrow size distribution were prepared by a reverse (w/o) microemulsion method. The powder X-ray diffraction (XRD) pattern indicated that the obtained silver nanoparticles were of face-centered cubic structure. The results of the transmission electron microscopy (TEM) show that the final silver nanoparticles are of spherical structure with a... 相似文献