全文获取类型
收费全文 | 127篇 |
免费 | 6篇 |
专业分类
化学 | 46篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 11篇 |
物理学 | 73篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 6篇 |
2018年 | 1篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 3篇 |
2012年 | 12篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1974年 | 1篇 |
1972年 | 2篇 |
1891年 | 2篇 |
1884年 | 1篇 |
排序方式: 共有133条查询结果,搜索用时 0 毫秒
131.
Zhong Z Ng V Luo J Teh SP Teo J Gedanken A 《Langmuir : the ACS journal of surfaces and colloids》2007,23(11):5971-5977
Copper oxide with various morphologies was synthesized by the hydrolysis of Cu(ac)2 with urea under mild hydrothermal conditions. In the synthesis, a series of organic amines with one or two amine groups (monoamine and diamine), including isobutylamine, octylamine (OLA), dodecylamine, octadecylamine (monoamines), ethylenediamine dihydrochloride, and hexamethylenediamine (diamines), was used as the "structure-directing agent". The monoamines led to the formation of one-dimensional (1D) aggregates of the copper oxide precursor particles (Pre-CuO), while the diamines led to the formation of two-dimensional (2D) aggregates. In both cases, the shorter carbon-chain amine molecules showed a stronger structure-directing function than that of the longer carbon-chain amine molecules. Next, in a series of syntheses, OLA was selected for further study, and the experimental parameters were systematically manipulated. When the hydrolysis was adjusted to a very slow rate by coupling the hydrolysis reaction with an esterification reaction, 1D aggregates of Pre-CuO were formed; when the hydrolysis rate was in the middle range, spherical Pre-CuO architectures composed of smaller linear aggregates were formed. However, under the high hydrolysis rates achieved by increasing the precipitation agent (urea) or by conducting the reaction at high temperatures (>/=120 degrees C), only Pre-CuO nanoparticles with a featureless morphology were formed. The formed spherical Pre-CuO architectures can be converted to a porous structure (CuOx) after removing the OLA molecules via calcination. Compared to the 1D and 2D aggregates, this porous architecture is highly thermally stable and did not collapse even after calcination at 500 degrees C. Preliminary results showed that the porous structure can be used both as a catalyst support and as a catalyst for the oxidation of CO at low temperatures. 相似文献
132.
Flibotte S Hackman G Theisen C Andrews HR Ball GC Beausang CW Beck FA Belier G Bentley MA Byrski T Curien D de France G Disdier D Duchêne G Fallon P Haas B Janzen VP Jones PM Kharraja B Kuehner JA Lisle JC Merdinger JC Mullins SM Paul ES Prévost D Radford DC Rauch V Smith JF Styczen J Twin PJ Vivien JP Waddington JC Ward D Zuber K 《Physical review letters》1993,71(5):688-691
133.