Article
Engineering, Environmental
Andrea Zambotti, Angela Bruni, Mattia Biesuz, Gian Domenico Soraru, Luca Rivoira, Michele Castiglioni, Barbara Onida, Maria Concetta Bruzzoniti
Summary: This paper presents the synthesis of a nanocrystalline silicon carbide aerogel for removing glyphosate from polluted water. The aerogel was synthesized using allylhydridopolycarbosilane as a precursor and showed a high specific surface area of 215 m(2)center dot g(-1) after pyrolysis at 1500 degrees C. Testing on glyphosate herbicide revealed a remarkable adsorption of 0.607 mg center dot g(-1) and a removal of 93% of the pollutant in solution. The Elovich kinetics adsorption and Langmuir isotherm models were found to accurately describe the mechanism of glyphosate capture.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Ceramics
Andrea Zambotti, Emanuel Ionescu, Nicola Gargiulo, Domenico Caputo, Cekdar Vakifahmetoglu, Balanand Santhosh, Mattia Biesuz, Gian Domenico Soraru
Summary: By embedding porous polymer-derived ceramics (PDCs) within the open cells of a silicon carbide foam, the thermal conductivity of the foam can be significantly reduced, allowing for a combination of mechanical properties and insulating ability.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Chang Ma, Qingchao Fan, Mahmut Dirican, Nakarin Subjalearndee, Hui Cheng, Junjing Li, Yan Song, Jingli Shi, Xiangwu Zhang
Summary: This study presents the design and preparation of carbon nanofibers with high specific surface area and rational pore configuration. By adjusting the TEOS content, controllable secondary nanostructure of silicon carbide nanofibers were achieved, leading to the preparation of microporous carbon nanofibers with considerable mesopores and diverse secondary nanostructure, showing excellent specific capacitance and high-rate capability in supercapacitors.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yeshin Lee, Hye-In Jung, Yeon-Im Jang, Byeong-Kwan An
Summary: In this study, multifunctional and monodisperse HPPEP colloids were successfully prepared, exhibiting excellent thermal, chemical, and mechanical resistances. The colloids also showed enhanced surface functionality through the chemical binding of dye molecules. Furthermore, the colloids could be transformed into porous carbon spheres and fully decomposed into environmentally friendly monomers in an alkaline environment.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Ceramics
Majid Yousefi, Mojtaba Ghatee, Mashallah Rezakazemi, Seyed Hadi Ghaderi
Summary: In this study, SiC coating was prepared using the polymer-derived ceramic method, and the effect of nano-alumina as a filler material was investigated. It was found that the addition of nano-alumina filler up to 20 wt% significantly improved the adhesion and wear resistance of the SiC coating.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Rongqian Yao, Yinong Zheng, Chao Jin, Wenyan Huang, Yuchen Han, Ke Li, Siqi Lan, Zhenguo Huang, Jiahao Hu, Yinggan Zhang
Summary: The unique properties of MoSi2 open up new opportunities for preparing bulk polymer-derived ceramics with favorable structural-functional capabilities. By utilizing a production route involving re-pyrolysis of ball-milling-induced SiC fillers and flexible precursors blends, in situ formed SiC(rGO, xMoSi(2)) bulk PDCs with optimized properties can be obtained. Notably, these materials exhibit enhanced hardness, fracture toughness, and thermal conductivity, making them promising for emerging uses in the aerospace field.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Fabien Bouzat, Romain Lucas, Yann Leconte, Sylvie Foucaud, Yves Champavier, Cristina Coelho Diogo, Florence Babonneau
Summary: This study investigated the impact of Zr on the fabrication of ZrC-SiC composites by synthesizing specific polymeric structures and proposing a four-step mechanism, analyzing the role of Zr in the thermal path.
Article
Chemistry, Physical
Dongxu Cheng, Yihe Huang, Yudong Peng, Bin Wang, Wei Guo, Zhu Liu, Lin Li
Summary: In this study, a three-dimensional (3D) C-Si-SiC micro/nanoporous composite Li-ion battery (LIB) electrode was synthesized using a continuous-wave fiber laser on a copper foil from pure SiC powder. The volcano and fishnet structure electrodes exhibited higher reversible charge capacities and cycling performance. The results suggest that this method can improve the performance of SiC electrodes.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Ceramics
Xia Fang, Shoujun Hou, Limei Pan, Shuang Yin, Yang Wang, Quan Li, Dapeng Chen, Junyang Jin, Jian Yang
Summary: A core-shell structured spherical graphite (SG)@SiC attenuating agent with a tunable silicon carbide (SiC) shell thickness was synthesized through in-situ solid-liquid reaction of SG and Si. The resulting SG@SiC/AlN composite exhibited excellent thermal conductivity and microwave absorption ability, making it a promising microwave attenuating ceramic. This work provides a new core-shell structure strategy for designing high-efficiency attenuating agents and microwave attenuating ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Maria-Alexandra Paun, Vladimir-Alexandru Paun, Viorel-Puiu Paun
Summary: This paper studies the transport and escape of loaded polymers via a nanometer-sized aperture using nanomembrane driven by an exterior electrostatic field. A flux formula for polymers passing through a dimensional restricted pore is derived assuming a linear relationship between the friction coefficient and the number of segments, and a parabolic behavior for the open-free energy in the presence of an electrical potential across the nanopore. Additionally, the transport of linear polymers through a nanometer-sized pore under the action of a constant force is presented. The paper demonstrates the important mechanical effects of superimposed steady force and the number of monomers on the polymer translocation process by nanomembranes in a 2D diffusion model. The escape time as a function of electric field intensity and polymer monomers number is represented by a three-dimensional graph.
Article
Materials Science, Textiles
Yeeun Song, Young Jun Joo, Yangyul Ju, Byungwook Youn, Dong Geun Shin, Kwang Youn Cho, Doojin Lee
Summary: The study focuses on investigating the effect of ion mobility on changes in the crystal lattice of silicon carbides derived from polycarbosilane precursors. The rheological properties and fiber spinnability of aluminum-containing polycarbosilane precursors were studied to understand the polymer networking, further polymerization, and structural rearrangement behaviors during the spinning process. By elucidating the temperature ranges for continuous and uniform jetting of the precursors, enhanced network formation through further polymerization and structural rearrangement was achieved, resulting in increased formation of polycrystalline nanograins in uniform-sized silicon carbide fibers.
FIBERS AND POLYMERS
(2023)
Article
Materials Science, Ceramics
Matthew Laskoski, Joseph Prestigiacomo, Boris Dyatkin, Teddy M. Keller, Wadia Mahzabeen, Arica R. Shepherd, Mehana N. Daftary, Jadah S. Clarke, Arianna Neal, Syed B. Qadri, Mike Osofsky
Summary: Nanocrystalline niobium carbide ceramics and niobium carbide-niobium nitride composites were synthesized at low temperatures without high-pressure sintering, showing high purities and nanosized grains. The composites demonstrated good air oxidation stability with homogeneous morphologies and controllable amounts of free carbon.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Qingbo Wen, Zhaoju Yu, Ralf Riedel, Emanuel Ionescu
Summary: An amorphous ceramic containing boron, SiHfC(N,O), was synthesized through pyrolysis of a single-source precursor in Ar atmosphere at 1000 degrees C. High-temperature annealing resulted in the formation of HfCxN1-x nanoparticles and beta-SiC crystallization, with the eventual generation of HfB2 at temperatures beyond 1900 degrees C. The addition of boron increased the sintering activity of SiHfC(N,O) and led to the production of dense materials with improved mechanical properties compared to boron-free SiC/HfC.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Jing-Xin Jian, Valdas Jokubavicius, Mikael Syvajarvi, Rositsa Yakimova, Jianwu Sun
Summary: Cubic silicon carbide (3C-SiC) shows promise as a photoelectrode material for solar water splitting due to its small band gap and ideal energy band positions, but typically experiences reduced photocurrent despite the presence of various oxygen-evolution-reaction (OER) cocatalysts.
Article
Multidisciplinary Sciences
Christopher P. Anderson, Elena O. Glen, Cyrus Zeledon, Alexandre Bourassa, Yu Jin, Yizhi Zhu, Christian Vorwerk, Alexander L. Crook, Hiroshi Abe, Jawad Ul-Hassan, Takeshi Ohshima, Nguyen T. Son, Giulia Galli, David D. Awschalom
Summary: In this study, single-shot readout of single defects in silicon carbide (SiC) is achieved through spin-to-charge conversion, enabling mapping of the defect's spin state onto a long-lived charge state. The technique demonstrates over 80% readout fidelity and allows for measurement of long spin coherence times. Integration with semiconductor devices opens up opportunities for electrical readout.
Review
Materials Science, Multidisciplinary
Yu Liu, Huy Q. Ta, Xiaoqin Yang, Yue Zhang, Junhua Zhou, Qitao Shi, Mengqi Zeng, Thomas Gemming, Barbara Trzebicka, Lei Fu, Mark H. Ruemmeli
Summary: This review focuses on the fabrication and characterization of free-standing nanostructures suspended in graphene using transmission electron microscopy, which enables the observations with atomic resolution and investigations of the dynamic behavior of atoms/structures in such materials. Additionally, the review discusses the influence of novel metal/nonmetal dopants in graphene vacancies with varying bond configurations and the catalytic activities of single atoms/clusters located at the graphene edges. Moreover, the dynamic forming process of freestanding single-atom-thick two-dimensional (2D) clusters/metal/metallenes and 2D clusters/metal/metallenes oxides is discussed.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Panpan Zhao, Markus Gusenbauer, Harald Oezelt, Daniel Wolf, Thomas Gemming, Thomas Schrefl, Kornelius Nielsch, Thomas George Woodcock
Summary: In this study, aberration-corrected scanning transmission electron microscopy coupled with electron energy-loss spectroscopy was used to investigate the atomistic structure and chemical composition of twin boundaries in ferromagnetic r-MnAl-C. The results showed that there was Mn enrichment at both coherent and incoherent twin boundaries, and a transition region with Mn enrichment was found at order twin boundaries. Micromagnetic simulations revealed that increasing structural and chemical disorder at the interface led to an increase in coercivity.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Sahin Cangaz, Oliver Lohrberg, Thomas Abendroth, Christian Heubner, Florian Schmidt, Holger Althues, Susanne Doerfler, Alexander Michaelis, Stefan Kaskel
Summary: The study finds that using moderately thick copper current collectors can effectively reduce the mechanical failure caused by volumetric expansion of silicon anode materials, thereby increasing the energy density of lithium-ion batteries.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Energy & Fuels
Stephanie Poetke, Sahin Cangaz, Felix Hippauf, Stefan Haufe, Susanne Doerfler, Holger Althues, Stefan Kaskel
Summary: This study investigates the use of nickel-rich NCM and silicon microparticles as electrode materials in lithium-ion solid-state batteries. By reducing the charge cut-off potential of the cells, the capacity retention after 50 cycles is significantly improved without active pressure control. This concept addresses the volume changes and availability of the anode material, making it suitable for applications such as electric vehicles.
Article
Green & Sustainable Science & Technology
Magdalena Fiedler, Sahin Cangaz, Felix Hippauf, Susanne Doerfler, Thomas Abendroth, Holger Althues, Stefan Kaskel
Summary: All-solid-state lithium-sulfur batteries (ASSB-LiS batteries) are advanced candidates for future energy storage systems due to their enhanced safety and higher energy densities. A solvent-free process to prepare free-standing cathode sheets with low binder content has been demonstrated in this study. The sheet-type cathodes achieve nearly theoretical sulfur utilization and outstanding capacity retention, and an all-solid-state pouch cell using the dry-film cathode shows good performance at different C-rates.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Multidisciplinary Sciences
Francesco Walenszus, Volodymyr Bon, Jack D. Evans, Simon Krause, Juergen Getzschmann, Stefan Kaskel, Muslim Dvoyashkin
Summary: A unique feature of metal-organic frameworks (MOFs) is their structural switchability, which offers a wide range of functionality for sustainable energy applications. This study provides experimental evidence for fluid metastability and history-dependent states during sorption in MOFs, leading to the counterintuitive phenomenon of negative gas adsorption (NGA). The authors used various techniques to examine n-butane molecular dynamics and the framework response during the sorption process, revealing the role of metastable states in the NGA transitions.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Marietta Seifert, Barbara Leszczynska, Robert Weser, Siegfried Menzel, Thomas Gemming, Hagen Schmidt
Summary: TiAl-based SAW devices were prepared by depositing Ti/Al multilayers on high-temperature stable CTGS substrates, and characterized for their durability and electrical behavior at intermediate high temperatures. The devices exhibited sufficient stability and a linear dependence of the resonant frequency on temperature, making them suitable for long-term applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Electrochemistry
Florian S. Hoffmann, Florian Schmidt, Jannes Mueller, Kay Schoenherr, Susanne Doerfler, Thomas Abendroth, Holger Althues, Arno Kwade, Nae-Lih Wu, Stefan Kaskel
Summary: In this study, a new low density electrolyte based on hexyl methyl ether (HME) and 1,3-dioxalane (DOL) was introduced, which allows the use of graphite as anode material for Li-S batteries. By using symmetric graphite vs. graphite cells, an average Coulombic efficiency of 99.94% per electrode could be achieved. Furthermore, the cycling conditions for Li-S cells with graphite anodes were optimized for the first time, and the feasibility of the concept was demonstrated in multilayer pouch cells under realistic conditions.
BATTERIES & SUPERCAPS
(2023)
Article
Nanoscience & Nanotechnology
Yutong Luo, Leonid Shupletsov, Maria Rita Vega, Adrian Gutierrez-Serpa, Arafat Hossain Khan, Eike Brunner, Irena Senkovska, Stefan Kaskel
Summary: By combining conductive MOFs with CNTs, the electrocatalytic performance for glucose detection can be enhanced, leading to the design of advanced nonenzymatic glucose sensors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Ahmed G. Attallah, Volodymyr Bon, Kartik Maity, Eric Hirschmann, Maik Butterling, Andreas Wagner, Stefan Kaskel
Summary: Atmospheric water harvesting using metal-organic frameworks (MOFs) is a promising technology for providing clean and long-term water supply in arid areas. In-situ positron annihilation lifetime spectroscopy (PALS) has been utilized to understand the water sorption mechanism in MOFs and select suitable candidates for desired applications. This study investigated the DUT-67-Zr and DUT-67-Hf frameworks using PALS, revealing the stepwise pore filling mechanism of water molecules in MOFs and offering insights for the design and use of MOFs for water harvesting.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Niklas Unglaube, Marc Florent, Thomas Otto, Adrian Gutierrez-Serpa, Markus Stoetzer, Julia Grothe, Stefan Kaskel, Teresa J. Bandosz
Summary: Activated carbon with modified surface chemistry and porosity effectively removes formaldehyde at room temperature. The addition of nitrogen enhances the adsorption capacity, particularly in ultramicropores, increasing the utilization of the carbon surface.
Article
Chemistry, Multidisciplinary
Sattwick Haldar, Arafat H. Khan, Ankita De, Fanny Reichmayr, Ahiud Morag, Minghao Yu, Andreas Schneemann, Stefan Kaskel
Summary: In this study, sulfur is covalently integrated into a polymer through a chemical reaction, enabling it to be used as an electrode material in batteries. This novel electrode material mitigates the dissolution and shuttle effect of sulfur in the batteries, leading to improved cycling stability and reduced overpotential.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Electrochemistry
Christin Gellrich, Yannik Braeuniger, Ralf Schmidt, Julia Grothe, Stefan Kaskel
Summary: 3D printing of flexible electronics using suitable printable inks is a promising technology. This study presents a sustainable carbon ink for 3D extrusion printing of well-defined, flexible all-solid-state micro-supercapacitors (MSC). The MSCs fabricated using this ink exhibit high areal capacitances and excellent cycle stability even under mechanical stress. Various suspension additives are explored to improve the rheological behavior, conductivity, and electrochemical performance of the MSCs.
BATTERIES & SUPERCAPS
(2023)
Article
Nanoscience & Nanotechnology
Bodo Felsner, Karuppasamy Gopalsamy, Volodymyr Bon, Irena Senkovska, Guillaume Maurin, Stefan Kaskel
Summary: In this study, two new metal-organic framework compounds with unique structures and high porosity were synthesized. The compounds showed promising adsorption properties for N-2, Ar, CH4, and CO2 gases. The microscopic adsorption mechanism was elucidated through grand canonical Monte Carlo simulations.
Article
Electrochemistry
Florian S. Hoffmann, Florian Schmidt, Jannes Mueller, Kay Schoenherr, Susanne Doerfler, Thomas Abendroth, Holger Althues, Arno Kwade, Nae-Lih Wu, Stefan Kaskel
Summary: A new low density electrolyte based on hexyl methyl ether (HME) and 1,3-dioxalane (DOL) is presented in this study, which allows the use of graphite as anode material for Li-S batteries. The electrolyte showed a high Coulombic efficiency in graphite vs. graphite cells. Additionally, the cycling conditions for Li-S cells with graphite anodes were optimized for the first time.
BATTERIES & SUPERCAPS
(2023)