Go for the burn! Sol–gelautocombustion is an energy‐efficient approach to synthesizing metals, such as Co, Ni, Cu, Ag, Bi, and Co–Ni alloy. Based on differential thermal analysis (DTA) and mass spectrometry measurements (see picture for Ni gel), a reaction mechanism is proposed that leads to the formation of metals and metalalloys instead of metal oxides.
Elastic moduli and thermal expansion coefficients of medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy
作者:G. Laplanche、P. Gadaud、C. Bärsch、K. Demtröder、C. Reinhart、J. Schreuer、E.P. George
DOI:10.1016/j.jallcom.2018.02.251
日期:2018.5
Abstract Elastic moduli of a set of equiatomicalloys (CrFeCoNi, CrCoNi, CrFeNi, FeCoNi, MnCoNi, MnFeNi, and CoNi), which are medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy were determined as a function of temperatureover the range 293 K–1000 K. Thermal expansion coefficients were determined for these alloysover the temperaturerange 100 K–673 K. All alloys were single-phase and had the
Abstract Thick-film magnetoresistive sensors based on Ni and Cofinepowders have shown promising results. In order to improve their performance Ni, Co and NiCopowders were prepared by the polyol process. The metallic powders were characterised by simultaneous thermogravimetric and differential thermal analysis (TGA-DTA), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM).
摘要 基于 Ni 和 Co 细粉的厚膜磁阻传感器已显示出令人鼓舞的结果。为了提高Ni、Co和NiCo的性能,采用多元醇法制备了Ni、Co和NiCo粉末。通过同步热重和差热分析 (TGA-DTA)、X 射线衍射分析 (XRD) 和扫描电子显微镜 (SEM) 对金属粉末进行表征。
Nanostructured Co<sub>x</sub>Ni<sub>1−x</sub>bimetallic alloys for high efficient and ultrafast adsorption: experiments and first-principles calculations
dehydrogenation of hydroushydrazine (N2H4·H2O). The excellent catalyticperformance of the Cu0.4Ni0.6Mo catalyst may be attributed to the electronic modification among Cu, Ni and Mo, and may also be related to the strong basic sites of Cu0.4Ni0.6Mo. The present simple, low cost, highly efficient, and highly selective catalyst may promote the practical application of N2H4BH3 as an effective hydrogenstorage material
肼硼烷(N 2 H 4 BH 3,H 15.4 wt%H)由于其固有的优势(例如高氢含量和高固态稳定性)而被认为是一种很有前途的储氢材料。然而,由于需要昂贵的贵金属基催化剂,强烈抑制了N 2 H 4 BH 3在产生氢中的实际应用。为了克服这一挑战,在室温和环境气氛下使用简便的化学还原方法制备了不含贵金属的CuNiMo纳米催化剂。出乎意料的是,所得的CuNiMo催化剂表现出优异的催化活性和100%的H 2。N 2 H 4 BH 3通过其BH 3基团水解和N 2 H 4部分在323 K分解生成氢的选择性。据我们所知,这是第一个关于无贵金属催化剂实现氢键反应的报道。 N 2 H 4 BH 3完全转化为H 2。另外,CuNiMo可以实现含水肼(N 2 H 4 ·H 2 O)的完全脱氢。Cu 0.4 Ni 0.6的优异催化性能Mo催化剂可能归因于Cu,Ni和Mo之间的电子修饰,也可能与Cu 0.4 Ni