Article
Chemistry, Multidisciplinary
Jie Zhang, Wenxiang Mu, Fu Bo, Gaohang He, Sunan Ding, Yang Li, Zhitai Jia
Summary: An effective method without a catalyst and template was developed for the synthesis of novel gallium oxide (Ga2O3) micro/nanostructures. Urchin-like microspheres with uniformly distributed nanowires were successfully prepared by heating at high temperature. The resulting product exhibited high crystalline quality and intense ultraviolet-blue emission properties. Possible growth mechanism of the urchin-like microspheres was proposed. These findings highlight the potential of Ga2O3 micro/nanostructures for optoelectronic device applications.
Article
Engineering, Chemical
Regina Rodriguez, Domenic Contrino, David Mazyck
Summary: The study compared bituminous coal-based activated carbon with coconut shell and wood-based activated carbons for elemental mercury removal, finding that bituminous coal-based AC showed better performance due to more carbene sites. Treating AC with nitric acid increased oxygen functional groups on the surface, leading to improved mercury removal. Heat treatments post-oxidation created free carbene sites, which were found to be more reactive to mercury adsorption than oxygen, ultimately being the most compelling mercury removal mechanism.
Article
Chemistry, Physical
Felix Herold, Niklas Oefner, Dina Zakgeym, Alfons Drochner, Wei Qi, Bastian J. M. Etzold
Summary: Oxidized carbon materials, contrary to previous beliefs, can act as highly active solid acid catalysts at high temperatures in the dehydration of methanol, with good selectivity and conversion rates. The high-temperature acidity of these materials is attributed to the interaction of thermally stable carboxylic anhydrides and lactones with the reactants. A methyl ester is identified as a key intermediate for DME generation on oxidized carbon catalysts.
Article
Chemistry, Physical
Paolo Zapanta Ramos, Connor Clayton Call, Lauren Virginia Simitz, Jeffrey John Richards
Summary: The macroscopic properties of carbon black suspensions are mainly determined by the microstructure of agglomerates built of primary aggregates. Colloidal stability plays a crucial role in influencing their viscosity and conductivity. Experimental analysis revealed that treating carbon black with strong acids and wet oxidation resulted in changes in particle surface chemistry and electrophoretic mobility, indicating colloidal stability. Small-angle X-ray scattering was used to observe changes in suspension microstructure due to oxidation. Rheo-electric measurements showed that the viscosity and conductivity of carbon black suspensions were affected by shear rate and carbon content. Aqueous carbon black suspensions formulated with electrostatically repulsive primary aggregates exhibited a smaller increase in conductivity with carbon content compared to those formulated with attractive agglomerates.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Lixing Xia, Wenbo Huo, Heng Zhang, Kunxiang Xu, Yizhao Qing, Fengming Chu, Chao Zou, Hao Liu, Zhan'ao Tan
Summary: In this study, we modified a carbon felt electrode using thermal oxidation and investigated the effect of heating time on 2,6-DHAQ/K4Fe(CN)(6) RFBs. The results showed that a heating time of 2.0 hours resulted in lower capacity decay rate in 200 cycles for 2,6-DHAQ/K4Fe(CN)(6) RFBs.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Seo Hui Kang, Hye Jin Yang, Joon Young Cho, Jeong Hoon Kim, Kwang Chul Roh, Joong Tark Han
Summary: This study presents a method for fabricating highly conductive and porous CNT network films through the filtration of oxidized carbon nanotube dispersions and thermal deoxygenation. The hybrid film of oxidized SWCNTs and oxidized long multi-walled CNTs exhibited enhanced electrochemical performance, attributed to increased mesopores and improved electrical conductivity.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Environmental
Zhuangzhuang Wei, Nanxiang Zhang, Tao Feng, Feng Wu, Teng Zhao, Renjie Chen
Summary: By coating separators with ethylene-vinyl acetate copolymer microspheres, the thermal stability of lithium-sulfur batteries is enhanced. The thermal shutdown separators made from EVA/PP have fast thermal response, excellent porosity, and electrolyte wettability, reducing the risk of thermal runaway effectively.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Md Shahadat Hossain, Takeshi Furusawa, Masahide Sato
Summary: A simple and cost-effective hydrothermal technique was used to fabricate hollow α-Fe2O3 microspheres, which were characterized by various methods. The microspheres exhibited a shell composed of aggregated α-Fe2O3 nanoparticles with a hollow interior. This material shows potential applications in drug delivery, gas sensing, and lithium storage.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Energy & Fuels
Charlie Adams, Ehsan Alborzi, Xue Yong, Simon Blakey, Anthony J. H. M. Meijer, Mohamed Pourkashanian
Summary: A combination of experimental and quantum chemical techniques confirmed the theory that sulfur acids are the initial species to deposit on stainless steel.
Article
Nanoscience & Nanotechnology
Huajun Xu, Honglei Dong, Xintong Liu, He Qiao, Gang Chen, Fei Du, Yohan Dall'Agnese, Yu Gao
Summary: This study proposes a method of short oxidation of Molybdenum carbide at high temperatures to fabricate a Mo2C/MoO3 heterostructure, which exhibits excellent capacitance and cycling stability in aqueous system. The results demonstrate the possibility of transforming a neglected MXene into a high-performance electrode for supercapacitors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Jingrui Huang, Xiaoru Meng, Guangzhao Zhu, Yihang Song, Shoupu Zhu, Ming Chen, Qi Li, Yue Zhou, Meng -Chang Lin
Summary: Thermally oxidized activated carbon (TOAC), acidified activated carbon (AAC), and thermally deoxygenized AC (TAC) were prepared. TOAC showed the highest oxygen content and specific surface area among the three types of activated carbon. TOAC exhibited a significantly higher capacitance than AC, AAC, and TAC, indicating the synergistic effect of anchoring oxygen and large specific surface area on capacitance performance. The oxygen content enhanced the wettability between electrode and electrolyte, while the large specific surface area facilitated ions adsorption and ionic diffusion and transport.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Abdelhakim Elmouwahidi, Esther Bailon-Garcia, Agustin F. Perez-Cadenas, Alain Celzard, Vanessa Fierro, Francisco Carrasco-Marin
Summary: N-doped carbon microspheres with high BET surface area and specific capacitance were prepared by N-doping with urea, showing significant pseudocapacitance reactions. These electrodes exhibited good retention of capacitance even after cycling for 12000 charge-discharge cycles.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Thermodynamics
Magdalena Maciejewska, Marta Grochowicz
Summary: The paper presents a method for preparing and functionalizing polymer microspheres using glycidyl methacrylate (GMA) and crosslinking agents. Thiol groups were introduced into the microspheres through a reaction with thiocarboxylic acids. The chemical structure, elemental composition, and thermal stability of the microspheres were analyzed. The functionalized microspheres exhibited higher thermal stability compared to the starting microspheres.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Multidisciplinary
Hyeokjun Park, Hayoung Park, Kyung Song, Seok Hyun Song, Sungsu Kang, Kun-Hee Ko, Donggun Eum, Yonggoon Jeon, Jihoon Kim, Won Mo Seong, Hyungsub Kim, Jungwon Park, Kisuk Kang
Summary: Nickel-rich layered oxides are important cathode materials for lithium-ion batteries. The synthesis process is influenced by the kinetic competition between thermal decomposition and lithiation, which leads to the formation of spatially heterogeneous intermediates. Thermal decomposition results in defective structures, while promoting lithiation can mitigate their generation and suppress chemo-mechanical failures.
Article
Engineering, Multidisciplinary
Shu-jie Liu, Bi-dong Wu, Jia-ni Xie, Zhi-min Li, Chong-wei An, Jing-yu Wang, Xiao-dong Li
Summary: In this study, insensitive energetic explosive DAAF/RDX microspheres were fabricated using a self-assembly method, showing enhanced thermal stability and mechanical safety compared to rod-like DAAF/RDX. The findings suggest promising desensitization of RDX and potential wide applications for the prepared microspheres.
DEFENCE TECHNOLOGY
(2021)
