排序方式: 共有46条查询结果,搜索用时 15 毫秒
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描述了在过剩压驱动下金刚石晶种外延生过程中,大量伴生的石墨再结晶现象。再结晶石墨抑制了金刚石的自发成核;它们分布于合成腔触媒金属的低温区,结晶数量多,晶粒片状分层,尺寸大,但出现乱层晶体结构;同时产生一定数量的无定形碳。分析认为,这与长时间的低过剩压驱动,触媒金属内有足够的碳源供给,并具备在高温高压下石墨充分结晶但又达不到完全石墨化条件有关。还讨论了在低过剩压驱动下,促进金刚石晶体外延生长的碳源可能是活化的碳原子,而不是具有乱层结构特征的再结晶石墨。 相似文献
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Ma Ji Chen Jinjin Chen Liye Zhou Xingjian Qin Xujia Tang Ying Sun Guodao Chen Jiazhou 《显形杂志》2021,24(3):545-563
Journal of Visualization - Effective extraction and visualization of complex target features from volume data are an important task, which allows the user to analyze and get insights of the complex... 相似文献
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Xie P Wang L Yang L Li E Ma J Huang Y Chen R 《The Journal of organic chemistry》2011,76(19):7699-7705
A novel domino annulation between sulfur ylides and salicyl N-thiophosphinyl imines was developed. The method allows the synthesis of a highly substituted trans-2,3-dihydrobenzofuran skeleton with high yield and excellent chemo- and stereoselectivity. 相似文献
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Sun Yue Zhao Mengyuan Liu Yutong Fu Liye Li Siyu Yang Yifei 《Journal of Solid State Electrochemistry》2019,23(2):583-590
Journal of Solid State Electrochemistry - Erythromycin (ERY) molecular imprinted polymer was prepared on the surface of Au electrode modified with Ni and Au nanoclusters (MIP/AuNCs/Ni/Au) via... 相似文献
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One‐pot Synthesis of Nitrogen and Phosphorus Co‐doped Graphene and Its Use as High‐performance Electrocatalyst for Oxygen Reduction Reaction
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Liye Dong Dr. Chuangang Hu Xianke Huang Dr. Nan Chen Prof. Liangti Qu 《化学:亚洲杂志》2015,10(12):2609-2614
In this study, N,P co‐doped graphene (NPG) was prepared by a one‐step pyrolysis using a mixture of graphene oxide and hexachlorocyclotriphosphazene (HCCP), in which HCCP was used as both the N and P source. Furthermore, it is shown that NPG electrodes, as efficient metal‐free electrocatalysts, have a high onset potential, high current density, and long‐term stability for the oxygen reduction reaction. 相似文献
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当温度超过1 000 ℃时,人造金刚石中的金属触媒包裹体,在形态、结构和成份上都将发生改变,并且这种变化会在金刚石晶格内造成尺寸更大的缺陷区域,因此在表面氧化不起决定性作用的情况下,金属触媒包裹体的这种变化,就成了导致金刚石强度下降的最直接的原因。我们对在氩气保护下、不同温度处理的一系列人造金刚石样品进行了强度测量,并用SEM、X射线衍射及光学显微镜等手段观测了金刚石断裂表面上的包裹体及其形态变化。我们的实验结果证实了上述结论。我们还发现,金属触媒包裹体的存在极大地影响着金刚石的热稳定性,它们使金刚石在1 000 ℃左右即可向石墨转化。 相似文献