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浏览/检索结果: 共3条，第1-3条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Hydrothermal synthesis of magnetite: investigation of influence of aging time and mechanism 期刊论文 Micro & nano letters, 2015, 卷号: 10, 期号: 2, 页码: 99-104 作者:  Sun, Xiaoning;  Sun, Kangning;  Liang, Yanjie 收藏  |  浏览/下载：4/0  |  提交时间：2019/12/17 iron compounds  crystal growth from solution  powders  ageing  surface morphology  particle size  magnetisation  ferromagnetic materials  magnetic particles  hydrothermal synthesis  magnetite  aging time  mechanism research  ethylene glycol solvent  morphology  iron hydroxide powders  spherical shapes  particle size  specific saturation magnetisation  time 1 h to 10 h  Fe3O4   Synthesis of magnesium oxysulfate whiskers in the presence of sodium dodecyl benzene sulfonate 期刊论文 2010, 2010 Sun, X.T.; Xiang, L. 收藏  |  浏览/下载：4/0 Replacement of methane from quartz sand-bearing hydrate with carbon dioxide-in-water emulsion 期刊论文 energy & fuels, 2008, 卷号: 22, 期号: 3, 页码: 1759-1764 作者:  Zhou, Xitang;  Fan, Shuanshi;  Liang, Deqing;  Du, Jianwei 收藏  |  浏览/下载：69/10  |  提交时间：2010/09/23 The replacement of CH4 from its hydrate in quartz sand with 90:10, 70:30, and 50:50 (W-CO2:W-H2O) carbon dioxide-in-water (C/W) emulsions and liquid CO2 has been performed in a cell with size of empty set 36 x 200 mm. The above emulsions were formed in a new emulsifier, in which the temperature and pressure were 285.2 K and 30 MPa, respectively, and the emulsions were stable for 7-12 h. The results of replacing showed that 13.1-27.1%, 14.1-25.5%, and 14.6-24.3% of CH4 had been displaced from its hydrate with the above emulsions after 24-96 It of replacement, corresponding to about 1.5 times the CH4 replaced with high-pressure liquid CO2. The results also showed that the replacement rate of CH4 with the above emulsions and liquid CO2 decreased from 0.543, 0.587, 0.608, and 0.348 1/h to 0.083, 0.077, 0.069, and 0.063 1/h with the replacement time increased from 24 to 96 h. It has been indicated by this study that the use of CO2 emulsions is advantageous compared to the use of liquid CO2 in replacing CH4 from its hydrate.