Article
Chemistry, Physical
Theophile Niyitanga, Haekyoung Kim
Summary: In this study, bimetallic copper-cobalt oxide nanoparticles embedded on nitrogen-doped reduced graphene oxide substrates were fabricated as catalysts for the oxygen evolution reaction and hydrogen evolution reaction. The synthesized catalyst exhibited outstanding electrochemical activity, comparable to Pt/C and IrO2, and showed promise as a bifunctional catalyst for overall water splitting.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Ceramics
Jianhui Chen, Ziran Ye, Mingjia Zhi, Zhanglian Hong
Summary: This study presents a simple method for synthesizing highly porous Co2Ni and Co2Ni/reduced graphene oxide composite aerogels in an aqueous solution. The composite materials show excellent catalytic activity for hydrogen evolution in alkaline electrolytes.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Guanying Song, Lun Zhao, Hongwei Jing, Ziyun Wang, Jiayu Li
Summary: A novel cobalt-based coordination polymer was synthesized and compounded with graphene oxide to form a composite material. The composite material exhibited good hydrogen precipitation properties and electrocatalytic performance, showing potential as an alternative to precious metal materials.
JOURNAL OF MOLECULAR STRUCTURE
(2024)
Article
Chemistry, Physical
Lili Wang, Wurigamula He, Ying Yang, Helin Zhang, Dongyan Liu, Wensheng Yu, Qianli Ma, Duanduan Yin, Xiangting Dong
Summary: Active site engineering is an essential strategy to improve the electrocatalytic capability of electrocatalysts for practical applications. This study synthesized Co3O4/nickel foam and Co2(P4O12)/nickel foam electrocatalysts with flower-shaped and sea urchin-shaped structures, showing good catalytic activity for overall water splitting.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Hanieh Mousavi, Thomas D. Small, Shailendra K. Sharma, Vladimir B. Golovko, Cameron J. Shearer, Gregory F. Metha
Summary: The UV light photocatalytic activity of an Au101NC-AlSrTiO3-rGO nanocomposite was evaluated for H-2 production. The nanocomposite showed significantly enhanced photocatalytic activity compared to Au101NC-AlSrTiO3 and AlSrTiO3, resulting in a 12-fold and 64-fold increase in H-2 production rate, respectively. The enhanced activity was attributed to the small particle size and high loading of Au101NC, achieved through non-covalent binding to rGO.
Article
Chemistry, Physical
Jing Dong, Tingting Sun, Yixin Zhang, Hong Zhang, Songrang Lu, Dongmei Hu, Jianfeng Chen, Lianbin Xu
Summary: By the synergistic interaction of Ni and Co, mesoporous structure of NiCo alloy, and the optimized combination of mesoporous NiCo with rGO, the optimal MNi63Co37/rGO(5) catalyst shows excellent electrocatalytic performance for hydrogen evolution reaction (HER) with a low overpotential of 115 mV, current density of 10 mA cm(-2), Tafel slope of 45 mV dec(-1), and high durability in alkaline solution.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Review
Materials Science, Ceramics
Pawan Rekha, Sarika Yadav, Lovjeet Singh
Summary: Electrolytic water splitting using cobalt phosphate-based materials is effective for producing oxygen and hydrogen in a non-toxic, green, and cost-effective manner. The combination of cobalt phosphates with semiconductors as co-catalysts facilitates fast electron transfer in solar water oxidation. The unique lattice structure of phosphate group aids in the adsorption and dissociation of water on the electrode surface.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Amit Kumar, Shachar Fite, Arik Raslin, Sachin Kumar, Amir Mizrahi, Atif Mahammed, Zeev Gross
Summary: Current technologies for hydrogen production have a large carbon footprint, but water electrolysis using platinum electrodes is only responsible for less than 5% of hydrogen production. In this study, cobalt electrocatalysis for proton reduction was investigated as an alternative to platinum. The most electron-rich cobalt complex exhibited comparable catalytic activity to platinum, with lower overpotential and higher faradaic efficiency. Mechanistic investigations revealed that the superior performance of the electron-rich complex is attributed to its ability to reduce protons by singly reduced cobalt.
Article
Engineering, Environmental
Jeong-Hwan Oh, Yong Hee Lee, Minseok Kim, Seung-Hyun Hong, Tae-Hee Kim, Sooseok Choi
Summary: Cobalt boride nanoparticles were synthesized using the thermal plasma process and demonstrated efficient electrocatalytic performance for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte. The particle size was controlled by changing the flow rate of the plasma-forming gas, and high crystallinity was achieved without post-treatment. The products exhibited better performance than cobalt-based catalysts reported to date in OER, although they had a higher Tafel slope and lower active surface area in HER. However, they maintained stable performance for both reactions for 40 h.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Yuanpeng Qian, Mengliang Hu, Liping Li, Xuepeng Liu, Shuqi Cao, Chuigen Guo
Summary: A novel 3D self-supporting electrode of graphene oxide/nickel-cobalt/carbonized wood (GO/Ni-Co/CW) is developed, showing excellent catalytic activity and corrosion resistance, which provides an effective strategy for new nickel-based water electrolysis electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Lifang Chen, Rizwan Ur Rehman Sagar, Jun Chen, Juan Liu, Sehrish Aslam, Farhat Nosheen, Tauseef Anwar, Naveed Hussain, Xinmei Hou, Tongxiang Liang
Summary: Research has shown that PyCoPc/GO fabricated from cobalt-phthalocyanine and graphene oxide exhibits efficient hydrogen evolution reaction in alkaline media. The active area of the catalyst was controlled through π-π stacking interaction between GO and PyCoPc, leading to the development of a highly efficient catalyst for hydrogen evolution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Le Chai, Shuling Liu, Shaotong Pei, Chao Wang
Summary: This paper presents a series of cobalt-nickel phosphide films electrodeposited on nickel foam substrates, exhibiting good catalytic activity in alkaline solutions for both the hydrogen evolution reaction and water oxidation reaction. The electrodes show low overpotentials and steep Tafel slopes, with potential applications in electrolyzing water for hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Rossella Greco, Lucia Baxauli-Marin, Filipp Temerov, Matyas Daboczi, Salvador Eslava, Yuran Niu, Alexei Zakharov, Meng Zhang, Taohai Li, Wei Cao
Summary: In this study, a multifunctional photocatalyst was formed by decorating 0D Co3O4 onto 2D Co(OH)2. The synthesized Co3O4@Co(OH)2 composite showed an efficiency of 40% in degrading polystyrene microplastics under 0.495 W white LED illumination, and achieved a H2 evolution reaction of 43 μmol g-1 without sacrificial agents. The energy band diagrams and analysis of radicals involved in the photocatalytic degradation revealed the mechanisms of both processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Theophile Niyitanga, Haekyoung Kim
Summary: In this study, a trimetallic CuxMox/Co1_xO nanoparticle catalyst grown on reduced graphene oxide was fabricated for the oxygen evolution reaction (OER). The catalyst exhibited outstanding electrochemical activity for the OER due to the conductive network provided by reduced graphene oxide and the additional active sites from the Cu and Mo dopants. This study provides a novel strategy for the development of efficient OER electrocatalysts for large-scale applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Warisha Naseeb, Qiming Liu, Forrest Nichols, Dingjie Pan, Muhammad Kaleem Khosa, Shaowei Chen
Summary: In this study, Ru-CoO@SNG nanocomposites were prepared by controlled pyrolysis and exhibited remarkable electrocatalytic activity for hydrogen evolution reaction. The codoped nitrogen and sulfur graphene oxide nanosheets facilitated the dispersion of nanoparticles, while the Ru-CoO heterostructures increased the active site density and improved the catalytic performance.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Changhoon Choi, Jung Been Park, Jong Hyun Park, Seungho Yu, Dong-Wan Kim
Summary: This study presents a novel approach to mitigate dendrite growth on Zn anodes in aqueous Zn metal batteries by fabricating an ultrathin and sturdy artificial solid electrolyte interphase (ASEI) composed mainly of interconnected ZnO nanoparticles. The ZnO-rich ASEI facilitates even Zn plating along the Zn(002) plane, minimizing dendrite proliferation and side-reactions. The symmetric cell with ZnO-rich ASEI exhibits outstanding cyclability and reduced voltage hysteresis, indicating a promising approach for stable Zn anodes in large-scale energy storage systems.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Gwang-Hee Lee, Myeong-Chang Sung, Dong-Wan Kim
Summary: This study conducts a detailed analysis of the characteristics of lithium-oxygen batteries (LOBs) combined with cobalt iodide as a self-defense redox mediator and explores their synergistic effect with propagermanium as an anti-superoxide disproportionator. The simultaneous use of a self-defensive redox mediator and anti-superoxide disproportionator leads to LOBs with low overpotential and long-term cycling performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Hyun Jung Shin, Sung-Woo Park, Sangbaek Park, Dong-Wan Kim
Summary: Vertically aligned reduced graphene oxide (rGO) with sulfur and poly(ethylene oxide)-based polymer electrolyte double-shell layers (VRG@S@PPE) enable high-loading sulfur cathode in lithium-sulfur batteries (LSBs). The combination of rGO with vapor-grown carbon fiber (VGCF) allows for gas evacuation without structural collapse, resulting in perfect double-shell layer contact. With the reinforcement of VGCF, sulfur-infiltrated rGO (VRG@S) exhibits high capacity and the addition of an additional polymer electrolyte further improves cycle retention, enabling safe and stable quasi-solid-state LSBs with high sulfur loading.
Article
Energy & Fuels
Dongjoo Park, Sangbaek Park, Dong-Wan Kim
Summary: We developed a biodegradable separator made from natural cellulose with a fibrous and porous structure rich in polar functional groups. These functional groups enhance electrolyte wettability, polysulfide adsorption, and lithium affinity, thus improving the performance of Li-S batteries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Sae In Suh, Heesoo Woo, So-Yeon Song, Dongjoo Park, Yong-Yoon Ahn, Eunju Kim, Hongshin Lee, Dong-Wan Kim, Changha Lee, Yong Sik Ok, Jaesang Lee
Summary: In this study, the correlation between the catalytic activity of UK Biochar Research Center biochars (BCs) and their physicochemical properties was explored, and the potential role of endogenous iron in promoting their persulfate activation capability by heat treatment was suggested. It was observed that there was a steady improvement in the persulfate activation efficiency with increasing annealing temperature exclusively for iron-containing BCs (e.g., sewage sludge (SS) BCs). The heat-initiated modification enhanced the electron transfer-mediating capacity and surface affinity toward persulfate, leading to the beneficial effect of annealing on the carbocatalytic activity of iron-containing BCs for non-radical persulfate activation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Seongbin Lee, Sooyeon Kim, Sang Soo Han, Dong-Wan Kim, Jiwon Lee, Youngtak Oh
Summary: In this study, Fe3O4-doped reduced graphene oxide (Fe-rGO) materials were prepared via a liquid-phase reduction technique under different coagulation conditions. The Fe-rGO adsorbents showed an effective and selective adsorption of amphiphilic VOCs, which was attributed to the synergistic effect of Fe3O4 nanoparticles and O active sites. The strategy of fabricating a metal oxide-carbon heterostructure provides a selective adsorption platform for amphiphilic VOCs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Se In Kim, Woong-Ju Kim, Jin Gu Kang, Dong-Wan Kim
Summary: Unlike conventional Si anodes, oxidized Si nanosheets, i.e., siloxene, show minimal volume expansion during cycling due to their unique geometries and chemical structures. However, the interactions of siloxene with binders and their effects on charge storage have not been extensively studied. In this study, the intermolecular interactions of siloxene with four typical binders were investigated, and alginate was found to form the strongest intermolecular bonds with siloxene, leading to enhanced cycling stability and rate performance. The alginate-based siloxene electrode exhibited an unprecedented charge capacity retention of 66% after 500 cycles at 200 mA g-1. This study provides valuable insights for designing binders for electrode materials with similar chemical structures to siloxene.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Bobae Ju, Hee Jo Song, Hyunseok Yoon, Do Kyung Kim, Hye Won Jin, Taeho Lim, Dong-Wan Kim
Summary: This study investigates the role and mechanism of metal carbonyls in the synthesis of PtMoCu NPs. By controlling the Mo(CO)(6) source and analyzing reaction intermediates, it is proved that sufficient Pt-organic complexes are essential for the formation of ultrafine monodispersed PtMoCu NPs. The PtMoCu/C catalyst with low Pt content shows higher ORR activity and stability compared to PtMoCu-SCR/C and benchmark Pt/C.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Sun Hee Choi, Woong-Ju Kim, Byeong-hyeon Lee, Sung-Chul Kim, Jin Gu Kang, Dong-Wan Kim
Summary: This article presents a new solvent-assisted synthesis method that successfully incorporates Sn into Li sulfide conductors. The resulting materials have high crystallinity and excellent ionic conductivity, air stability, and Li metal compatibility, making them suitable for all-solid-state batteries.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Jung Been Park, Changhoon Choi, Sang Won Jung, Byeong Chan Min, Jong Hyun Park, Dong-Wan Kim
Summary: This study develops a stable Zn metal anode in aqueous rechargeable Zn metal batteries (ARZMBs) by designing a Sn-based interfacial layer (ZnTCF@Sn) on Zn with textured crystal facets. ZnTCF@Sn provides abundant zincophilic sites and high surface energy, resulting in fast electrochemical kinetics and dendrite-free deposition. Furthermore, the uniform Sn coverage on the ZnTCF@Sn surface inhibits side reactions and enhances reversibility during Zn deposition/dissolution.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jong Hyun Park, Changhoon Choi, Jung Been Park, Seungho Yu, Dong-Wan Kim
Summary: Aqueous zinc-ion batteries (AZIBs) have gained attention for grid-scale energy storage. However, challenges such as dendrite accumulation, gas generation, and corrosion hinder their commercialization. This study proposes a novel artificial protective layer to address these issues, improving the stability and durability of the zinc anode.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kyounghoon Jung, Dwi Sakti Aldianto Pratama, Andi Haryanto, Jin Il Jang, Hyung Min Kim, Jae-Chan Kim, Chan Woo Lee, Dong-Wan Kim
Summary: The incorporation of iridium in ruthenium phosphides reduces the binding energy of hydrogen intermediates, enhancing catalytic activity and making it a promising low-cost catalyst for hydrogen evolution.
ADVANCED FIBER MATERIALS
(2023)
Article
Chemistry, Physical
Kunik Jang, Hyunseok Yoon, Ji Seong Hyoung, Dwi Sakti Aldianto Pratama, Chan Woo Lee, Dong-Wan Kim
Summary: In this study, a highly efficient electrocatalyst for hydrogen evolution reaction (HER) in alkaline media at high current densities was designed by Ru heteroatom doping and an open nanoframe structure. The designed catalyst exhibited excellent performance with low overpotential and long-term stability, attributed to the hydrophilic and aerophobic properties of the catalyst surface.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Review
Electrochemistry
Hyunseok Yoon, Bobae Ju, Dong-Wan Kim
Summary: Polymer electrolyte membrane water electrolysis (PEMWE) is a promising hydrogen energy production technology, but it still faces challenges in the acidic oxygen evolution reaction (OER). Existing noble metal electrocatalytic materials are insufficient for commercialization, necessitating the development of low-cost, highly active, and stable catalysts.
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)