Article
Chemistry, Physical
Zhenshuai Wang, Xingyang Bao, Dai Zhang, Zhineng Sun, Xuesong Lu, Ruoyu Hong
Summary: The separation and purification of kish graphite is crucial for its high value and comprehensive utilization. By utilizing water washing dust removal, magnetic separation, and acid leaching purification, kish flake graphite (KFG) can be effectively enriched and purified from low-cost industrial kish graphite. The purified KFG has suitable recovery (57.34%), high fixed carbon content (99.38%), low ash content (0.62%), and exhibits excellent electrochemical performance as a cathode material for aluminum ion batteries (AIBs) with high specific capacity, outstanding rate capability, and superior long-term cycling stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xuan Yang, Chenlu He, Weixiang Lin, Yijuan Qiu, Pengfei Li, Yandan Chen, Biao Huang, Xinyu Zheng
Summary: In this study, nano-flake graphite and bamboo activated carbon composites were prepared by simple ball milling and carbonization, and modified on the electrode surface to obtain an electrochemical sensor for the simultaneous separation and determination of hydroquinone and catechol. The sensor exhibited good wettability and adsorption capacity, making it suitable for real-time monitoring of pollutants in environmental water samples.
Article
Materials Science, Ceramics
Wenlong Song, Shoujun Wang, Yang Lu, Xuan Zhang, Zixiang Xia, Kai Sun, Guangming Xin
Summary: The study demonstrated that MoS2/PTFE composite coatings can effectively reduce the friction coefficient of ceramics, resist adhesion wear, and the primary tribological mechanisms include abrasive wear, coating spalling and delamination. With the increase of load, the friction performance tends to deteriorate due to lower surface hardness and shear strength.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yifan Zhao, Mingyang Zhang, Huimin Zhao, Zhiqiang Zeng, Chaoqun Xia, Tai Yang
Summary: By using a one-step hydrothermal method, nano-MoS2 sheets with a thickness of about 10 nm were successfully deposited in situ on graphite substrates. The reactant concentration had a significant effect on the uniform distribution of the catalyst layers, and both higher and lower concentrations were detrimental to the electrochemical performance of the nano-MoS2 catalyst layers. The prepared electrode exhibited the best electrocatalytic activity when the thiourea concentration was 0.10 mol/L.
Article
Engineering, Chemical
Shao-Kang Fang, Hui-Rong Li, Shi-Da Feng, Peng-Xiang Wang, Yue Yu, Hong Zhang, Jing Guo
Summary: This study successfully addresses the global challenge of efficient and simple separation of oil-water mixtures through the development of a superhydrophobic CA functional coating, which exhibits excellent stability.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Chemistry, Physical
Virinchi Krishna Lagisetti, A. Prasad Reddy, P. Vamsi Krishna
Summary: The current study focuses on investigating the tribological behavior of Al 6061 based nanocomposites and Al 6061/SiC/Graphite based hybrid nanocomposites. Dry sliding wear tests were conducted to analyze the wear coefficients and mechanisms involved. The results showed that the sample with 2 wt.% silicon carbide and 2 wt.% graphite exhibited the lowest depth of penetration and smaller wear debris particles compared to others.
Article
Electrochemistry
S. Banerjee, G. Sutradhar, P. Sahoo
Summary: This study investigates the effect of incorporating WC and graphite nanoparticles on the tribological characteristics of Mg-based hybrid nano-composites. The results show that the addition of 1%wt of graphite nanoparticles enhances the hardness of the composites and leads to lower friction coefficients and smoother worn surfaces.
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
(2023)
Article
Chemistry, Physical
Yun Zhao, Lina Wang, Jianjiao Wang, Yong Li, Canliang Ma, Gaoyi Han
Summary: This study developed a novel two-step gas phase strategy to construct a carbon coated Fe1-xS/exfoliated graphite hybrid structure, aiming to enhance the electrochemical performance of rechargeable potassium-ion batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Chemical
Ikram Rana, Hiroki Nagasawa, Toshinori Tsuru, Masakoto Kanezashi
Summary: Research focused on tailoring the network pore size of silica membranes through fluorine doping, aiming to enhance CO2/N2 permeance ratio. The fluorine-doped silica membranes showed improved performance, but exhibited a blocking effect in wet conditions with lower gas permeance compared to dry systems. Additionally, under high steam pressure, the hydrothermal stability of the silica membranes increased with higher fluorine concentrations.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
C. R. Raghavendra, S. Basavarajappa, Irappa Sogalad
Summary: The research focuses on studying the influence of surface roughness on the specific wear rate of Ni-alpha-Al2O3 composite coating. It was found that the presence of hard Al2O3 particles provides better specific wear resistance. The specific wear rate changes with the variation of surface roughness.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Materials Science, Multidisciplinary
Olof Backe, Sebastian Kalbfleisch, Dirk Stiens, Thorsten Manns, Anton Davydok, Mats Halvarsson, Magnus Hornqvist Colliander
Summary: Recent progress in CVD technology has enabled the synthesis of metastable cubic Ti1-xAlxN coatings with high Al content. These coatings have unique micro-and nano-structures and exhibit exceptional hardness and resistance to wear and oxidation. The thermal stability and decomposition behavior of nano-lamellar CVD Ti0.2Al0.8N have been investigated, revealing the formation of hexagonal AlN (h-AlN) in the grain boundaries and a bulk transformation of the nano-lamellar structure at higher temperatures. The results provide insights into the complex decomposition processes in these metastable cubic coatings.
Article
Chemistry, Multidisciplinary
G. Yergaziyeva, N. Makayeva, A. Abdisattar, M. Yeleuov, S. Soloviev, M. Anissova, A. Taurbekov, K. Dossumov, E. Akkazin, C. Daulbayev
Summary: In this study, Ni-foam and Ni-Fe composites obtained by the electrochemical method were used as catalysts for methane decomposition. The Ni-Fe150 catalyst showed high catalytic activity and stability at high temperatures.
Article
Materials Science, Ceramics
A. G. Abd-Elrahim, Doo-Man Chun
Summary: ZnO-graphene nanocomposites deposited on a nickel foam substrate through a kinetic spray process exhibited enhanced photocatalytic activity for methylene blue degradation. The incorporation of graphene species resulted in a decreased optical bandgap and improved visible light harvesting, leading to higher degradation efficiency and reaction kinetics rate constant in comparison with other nanostructured photocatalysts.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Nano-sized Co3O4-MoS2/Ni foam heterostructure electrodes were fabricated using a vacuum kinetic spray technique with microparticles of Co3O4 and MoS2. The addition of MoS2 enhanced the OER activity, with the electrode containing 75 wt.% MoS2 showing the highest activity and stability. Characterization techniques like SEM, Raman spectroscopy, and XPS revealed improvements in the surface states of the obtained heterostructure electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
A. G. Abd-Elrahim, Doo-Man Chun
Summary: ZnO-graphene nanosheet photoanodes were deposited at room temperature using a kinetic spray process, and were utilized for PEC water splitting. The hybrid photoanode with 50 wt% graphite content showed the smallest band gap and lowest emission intensity, demonstrating superior photoelectrochemical performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Hybrid nanocomposites of Mn3O4 nanorods and 2D materials successfully deposited on nickel foam porous substrate showed improved sensitivity and selectivity for electrocatalytic detection of H2O2, with a wide linear detection range.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Oyunchimeg Erdene-Ochir, Doo-Man Chun
Summary: By coating the hydrophobic polypropylene (PP) surface with a thick layer of hydrophobic silica nanoparticles (SNPs) using a compression molding process, the study demonstrated improvement in the superhydrophobic tendency and enhanced durability of the surface under various mechanical and chemical conditions. The results highlight the robustness of the superhydrophobic coating with SNPs.
Article
Chemistry, Physical
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Ternary Co3O4-Ni(OH)(2)-graphene hybrid nanocomposites are synthesized using a facile kinetic spray process, resulting in enhanced oxygen evolution reaction performance. The optimized heterostructure exhibits nanosheet and nanoflake morphologies, with improvements in disorder-related modes and downshift of binding energies. The best synthesized material demonstrates excellent OER performance and long-term stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Polymer Science
Van-Ta Do, Doo-Man Chun
Summary: This study proposes a simple and cost-effective method for fabricating superhydrophobic films with excellent performance and stability, which can be applied in various industrial fields.
Article
Materials Science, Multidisciplinary
A. G. Abd-Elrahim, Doo-Man Chun
Summary: A new approach for mechanical exfoliation and deposition of graphite, MoS2, and boron nitride at room temperature has been proposed, utilizing shock compaction waves to induce fragmentation and exfoliation of layered materials. This technique results in lattice expansion and improvement of disorder-related modes in the nanostructured thin films, as confirmed by x-ray diffraction, high-resolution transmission electron microscopy, Raman spectra, and x-ray photoelectron spectra analysis.
Article
Green & Sustainable Science & Technology
Jinsik Kim, Doo-Man Chun, Hyung Wook Park, Jisoo Kim
Summary: Porosity is a common issue in powder bed fusion-based additive manufacturing, hindering the underwater application of printed products. This study presents the surface treatment of polyamide 12 (PA12) using large pulsed electron beam (LPEB) irradiations, which effectively reduces surface roughness and porosity. The treatment also enhances hydrophobicity and eliminates the capillary effect, making the PA12 suitable for underwater applications.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Polymer Science
Van-Ta Do, Ngoc Giang Tran, Doo-Man Chun
Summary: Superhydrophobic surfaces with two-level micro-nano hierarchical polymer structures were successfully fabricated, showing superhydrophobicity with mechanical robustness.
Article
Nanoscience & Nanotechnology
Ngoc Giang Tran, Doo-Man Chun
Summary: Superhydrophobic metallic surfaces with special properties have attracted attention in both research and industry. This study developed an eco-friendly postprocess to simplify the fabrication process and reduce the time. The laser areal fluence parameter was also explored as a way to adjust water adhesion behavior.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Polymer Science
Oyunchimeg Erdene-Ochir, Van-Ta Do, Doo-Man Chun
Summary: A facile and low-cost method was presented to fabricate flexible superhydrophobic films with excellent mechanical durability and chemical stability using a hot-roll lamination process. The films displayed outstanding superhydrophobic properties and maintained high contact angles and low sliding angles even after multiple tests, showcasing promising self-cleaning and water droplet bouncing performance.
Article
Chemistry, Physical
Van-Ta Do, Doo-Man Chun
Summary: Freshwater shortages pose a threat to ecosystems and human communities worldwide. Inspired by the water collection abilities of cacti and desert beetles, researchers have successfully developed a simple and low-cost method of fabricating a surface that efficiently harvests water. This was achieved by spraying a solution of isopropyl alcohol and a mixture of hydrophobic and hydrophilic silica nanoparticles onto a laminating film, followed by hot-press lamination with sandpaper. The resulting surface exhibited wettability contrast patterns and achieved a high water-harvesting efficiency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Two-dimensional nanomaterials, such as graphene nanosheets and molybdenum disulfide nanoflakes, were hybridized with spinel Mn3O4 through a simple kinetic spray approach. The resulting heterostructured Mn3O4-2D hybrid nanocomposites showed improved reaction kinetics for oxygen evolution. The hybrid nanocomposites exhibited decreased overpotential and improved charge transfer kinetics, leading to enhanced stability for prolonged galvanostatic polarization.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Physics, Multidisciplinary
Manar A. Ali, Doo-Man Chun, E. M. M. Ibrahim, A. G. Abd-Elrahim
Summary: CdS quantum dots were synthesized and characterized. The analysis showed the presence of bi-structural phases and small crystallite size, resulting in high DC conductivity and small activation energy. Furthermore, the AC conductivity and dielectric constant of CdS quantum dots exhibited temperature-dependent behavior.
