Results 131 to 140 of about 369,121 (287)

Analysing the relation between pore structure and permeability of alkali-activated concrete binders

, 2015
Alkali-activated binders are usually porous materials that consist of various scales of pores, gels and residual raw material particles. The importance of pore structure has been highlighted in recent studies as it impacts the permeability of fluids and ...
H. Wang, Z. Zhang, Wang, H., Zhang, Z.
core   +1 more source

High‐Density‐Cluster Ru Catalyst Substitute for Pt/C Benchmark Improves Membrane Water Electrolysis

Advanced Science, EarlyView.
Yuan et al. report a high‐density, monodispersed Ru cluster catalyst featuring interfacial covalent bonds that modulate the electronic structure and optimize intermediate adsorption–desorption, thereby conferring pH‐universal HER activity with ampere‐level current densities and enabling the development of Pt‐free membrane electrodes.
Zhen Yuan, Jia Xu, Zhongchen Gao, Linyan A, Shiying Guo, Jingguo Hu, Zhengshan Tian, Xiaoyong Xu   +7 more
wiley   +1 more source

Impact of SCMs on Alkali Concentration in Pore Solution

The alkali metal concentration and pH values within the pore solution of a concrete strongly influence the occurrence and the extent of alkali-silica reaction (ASR). At (Na + K) concentrations <300 mmol/L, no significant ASR expansion is observed. The
Lothenbach, Barbara, De Weerdt, Klaartje, Ranger, Maxime, Leemann, Andreas, Krüger, Miriam E., Ranger, Maxime (author), de Weerdt, Klaartje (author), Krüger, Miriam E. (author), Leemann, Andreas (author), Lothenbach, Barbara (author)   +9 more
core   +1 more source

Hydrogen Production from Ammonia Electrochemical Cracking

Advanced Science, EarlyView.
NH3 electrochemical cracking (e‐cracking) is a complementary technique to centralized thermal cracking for releasing H2 from NH3. In this article, we review recent advances in catalyst development for these cracking techniques and conduct a techno‐economic analysis (TEA) to evaluate the economic feasibility of e‐cracking.
Yike Ye, Yi Shun Lim, Qian Wu, Kamal Elouarzaki, Zhichuan J. Xu   +4 more
wiley   +1 more source

Canadian experience of alkali-expansivity in concrete

, 1981
Alkali expansivity has been identified as the primary cause of deterioration of concrete structures in Canada. Potentially expansive aggregates have been found in numerous locations throughout the country.
Grattan-Bellew, P. E.
core   +1 more source

CeO2‐Based Electrocatalysts for the Oxygen Evolution Reaction: Design, Dynamic Mechanisms, and Electrolyte Adaptability

Advanced Science, EarlyView.
This Review shows how cerium oxide helps water‐splitting catalysts work better and last longer. It explains how CeO2 tunes electronic structure, oxygen‐vacancy behavior, and surface reconstruction, while adapting to alkaline, acidic, and seawater conditions.
Zhen Cui, Ailing Song, Zirui Cui, Manman Duanmu, Zhipeng Ma, Hao Liu, Guangjie Shao, Xinyi Tan, Guoxiu Wang, Hao Tian   +9 more
wiley   +1 more source

Recent Advances in High‐Entropy Nanozymes: From Fabrication to Applications

Advanced Science, EarlyView.
To highlight key achievements and clarify the current landscape of high‐entropy nanozymes (HEAzymes), this review summarizes state‐of‐the‐art developments ranging from thermodynamically and kinetically controlled synthetic strategies; enzyme‐like catalytic types, catalytic characteristics, and underlying mechanisms; to their antioxidative, therapeutic,
Yongjian Ai, Weibo Zhang, Pengjie Wang, Wentao Xu, Huiyuan Guo, Hong‐bin Sun, Meng‐Qi He, Fazheng Ren, Qionglin Liang   +8 more
wiley   +1 more source

The Reduction of an Alkali Nitrite by an Alkali Metal

The Reduction of an Alkali Nitrite by an Alkali Metal
application/pdf The hyponitrites have received the attention of many chemists besides myself since their discovery in 1871, and even this year new ways of forming them and the new working of an old method have been published. Yet much has been left to be put on record before a fairly correct and full history of these salts can be said to have been ...
openaire   +1 more source

Alkali-carbonate melts from the base of cratonic lithospheric mantle: links to kimberlites

, 2018
Identification of the primary compositions of mantle-derived melts is crucial for understanding mantle compositions and physical conditions of mantle melting.
Vadim Kamenetsky (14740705), Golovin, AV (15509216), Sharygin, IS (15675683), Yaxley, GM (15482015), Korsakov, AV (15594380)   +4 more
core  

Potassium‐Impurity‐Modulated Self‐Trapped Excitons and Energy Transfer in Phase‐Separated, Mn4+‐Doped Li2HfF6

Advanced Science, EarlyView.
Li2HfF6 contains two spectroscopically distinct self‐trapped excitons (STEs): intrinsic STE1 and redshifted, K‐associated STE2. Potassium incorporation stabilizes STE2, which selectively sensitizes Mn4+ red emission. This work uncovers the often‐overlooked role of trace K impurities, demonstrating impurity modulation as an effective strategy for tuning
Menuka Adhikari, Thomas Murray, Cameron J. Lewis, Jett Wu, Hari Adhikari, Cheng Li, Jianguo Wen, Hui Wu, Zhiping Luo   +8 more
wiley   +1 more source