Review
Materials Science, Ceramics
L. Piperno, A. Vannozzi, G. Sotgiu, G. Celentano
Summary: Chemical solution deposition of CeO2-based buffer layers is commonly used for producing coated conductors, although achieving the necessary characteristics of biaxial texture, flatness, and chemical inertia can be challenging. This review explores the theoretical background of nucleation and epitaxial growth, discusses common issues, and summarizes relevant results using surface roughness as a key parameter for evaluating buffer layer quality.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Physics, Applied
Oleksiy Troshyn, Christian Hoffmann, Veit Grosse, Jens Hanisch, Lucas Becker, Rudolf Gross
Summary: The study focuses on depositing LMO buffer layers on ISD-MgO/homoepi-MgO through electron beam physical vapor deposition to optimize properties for higher critical current density of subsequently deposited DyBCO superconducting films. Despite some challenges, the DyBCO films on LMO achieve significantly higher J(c) values compared to those on homoepi-MgO, indicating the potential use of this material in coated conductors based on ISD-MgO technology.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Daxing Huang, Hongjing Shang, Taiguang Li, Bowei Xie, Qi Zou, Hongwei Gu, Zhifeng Ren, Fazhu Ding
Summary: This study presents a novel method to fabricate a superconducting joining between YBCO coated conductors with large current capacities, achieving more than 90% retention of critical current. The use of an Ag layer in the joining strap promotes the recovery of superconductivity during oxygenation annealing, resulting in superior superconducting performance through optimized atomic alignment at the joined YBCO interface.
MATERIALS TODAY PHYSICS
(2021)
Article
Physics, Applied
P. Barusco, J. Giguere, C. Lacroix, F. Sirois, X. Granados, T. Puig, X. Obradors
Summary: This study presents a detailed fabrication route for the buffer-layers-CFD architecture using a solid-vapor silver sulfurization technique, and analyzes the performance of the trilayer structure processed under different conditions. The results show that this architecture allows for faster generation of electric potential, with a strong enhancement effect.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yaqing Li, Xiayao Lu, Yantao Mei, Chen Dong, Deepak Thrithamarassery Gangadharan, Kong Liu, Zhijie Wang, Shengchun Qu, Makhsud I. I. Saidaminov, Weifeng Zhang, Furui Tan
Summary: In this study, an organic/inorganic double planar hole transport layer (HTL) is constructed, which achieves a cascade type-II energy level alignment at the perovskite/HTL interfaces and a preferential ohmic contact at NiOx/carbon electrode. This design greatly enhances charge collection while suppressing charge transfer recombination in perovskite solar cells with carbon electrode. Additionally, the planar composite protects perovskite from being corroded by carbon paste, enabling a robust interfacial contact and achieving high efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Akihito Mizuno, Yuji Tsuchiya, Satoshi Awaji, Yutaka Yoshida
Summary: This study focuses on addressing heat leak issues in cooling superconducting magnets, proposing the use of wireless power transfer and superconducting diodes. By controlling the lattice strain of REBCO films, the maximum rectification characteristics were achieved at 70 K and 0.096 T, showing promise for optimal operating conditions in superconducting magnet applications.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Kaihang Dai, Jiamin Zhu, Chunjiang Guo, Zhijian Jin, Yue Zhao, Zhiyong Hong, Zhiwei Zhang
Summary: Pulsed lasers were utilized to drill small holes in buffer layers of coated conductors for improving mechanical properties. The impact of laser engraving on buffer layers and subsequent REBCO layers were investigated, along with the influence on critical currents of coated conductors. The mechanical strength of the grown samples was evaluated by measuring delamination strength under transverse tension.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Food Science & Technology
Thais de Cassia Naitzel, Vitor Augusto dos Santos Garcia, Carla Alves Monaco Lourenco, Fernanda Maria Vanin, Cristiana Maria Pedroso Yoshida, Rosemary Aparecida de Carvalho
Summary: In this study, coated paperboard was developed and characterized using the tape casting technique, with different ratios of agar-agar/chitosan and different numbers of coating layers. Applying a 0:100 coating significantly reduced water absorption capacity by approximately 15%. The water vapor permeability was reduced by 10 to 60% compared to uncoated paperboard, except for two layers coated with 0:100. The tensile index was higher in the machine direction than in the cross-section, and paperboard coated only with chitosan showed superior properties.
Article
Nanoscience & Nanotechnology
Arkka Bhattacharyya, Carl Peterson, Takeki Itoh, Saurav Roy, Jacqueline Cooke, Steve Rebollo, Praneeth Ranga, Berardi Sensale-Rodriguez, Sriram Krishnamoorthy
Summary: We demonstrate a new substrate cleaning and buffer growth scheme in beta-Ga2O3 epitaxial thin films using MOVPE. By growing a low-temperature un-doped Ga2O3 buffer followed by a transition layer to high-temperature Si-doped Ga2O3 channel layers, continuous growth of the channel structure was achieved. The parasitic Si channel at the epilayer-substrate interface was effectively compensated through solvent cleaning and hydrofluoric acid treatment. This substrate cleaning combined with the LT buffer scheme shows the potential for designing Si-doped beta-Ga2O3 channels with exceptional transport properties.
Article
Chemistry, Physical
Jae Yu Cho, Jun Sung Jang, Vijay C. Karade, Raju Nandi, Pravin S. Pawar, Tae-Jun Seok, Wonjin Moon, Tae Joo Park, Jin Hyeok Kim, Jaeyeong Heo
Summary: Atomic layer deposition (ALD) has been used to synthesize ZnSnO thin films with different Zn/(Zn+Sn) ratios, and their application as buffer layers in CZTSSe solar cells has been investigated. The solar cells with ZnSnO buffer layers show a significant improvement in short-circuit current density (J(sc)) compared to the CdS-buffered devices, primarily due to the wide band gap and high transparency of ZnSnO films. The results also demonstrate that the Zn/(Zn+Sn) ratio has a significant impact on the device parameters, particularly the open-circuit voltage (V-oc) and fill factor (FF).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Paper & Wood
Maria Luiza Cafalchio de Oliveira, Seyedmohammad Mirmehdi, Mario Vanoli Scatolino, Mario Guimaraes Junior, Anand Ramesh Sanadi, Renato Augusto Pereira Damasio, Gustavo Henrique Denzin Tonoli
Summary: This study evaluates the impact of spraycoating paper with a combination of cellulose nanofibrils and nanoclay on mechanical and barrier properties for applications like reinforced packaging bags. Proper coating and layering can enhance the properties of coated papers.
Article
Environmental Sciences
Xia Meng, Zhongming Liu, Shoujuan Wang, Fangong Kong
Summary: In this study, an ultrasound Fenton-like sponge iron system was used to enhance the degradation efficiency for chloramphenicol (CAP). The interactions between various factors were explored through single-factor experiments and the response surface method. The degradation efficiency for CAP was significantly high under specific conditions, but the addition of some inorganic salts reduced the degradation rate. Additionally, the antibacterial activity of CAP changed during the degradation process.
Article
Chemistry, Physical
Fangqing Xin, Caiyin You, Huarui Fu, Yifeng Hu, Li Ma, Na Tian, Zhenxiang Cheng, Xiaohui Wang, Pengwei Dou, Jingyan Zhang, Shouguo Wang
Summary: Researchers have prepared a flexible magnetic film sensitive to stress or strain induced by bending, and found that inserting a Ti3C2 MXene buffer layer can significantly improve the stability of its magnetic response under bending. They clarified the mechanism of stress releasing by the buffer layer through finite element calculation.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Ruoyu Sun, Nengkai Yu, Jing Zhao, Jiliang Mo, Yajia Pan, Dabing Luo
Summary: The superhydrophobic polyurethane sponge prepared in this study showed excellent separation efficiency, reusability, and chemical stability for oil/water mixtures.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Electrical & Electronic
Zilin Cui, Xin Zhang, Xiaolin Song, Yudong Xia, Xifeng Pan, C. H. Cheng, Yong Zhao
Summary: This study investigated the superconducting properties of YBCO grown on LAO substrate with ESBO buffer layers. The results indicated that the use of ESBO buffer layers increased the critical current density of YBCO films by approximately 40% at low applied magnetic field. Additionally, the analysis showed that the pinning force mechanisms changed with temperature and the ESBO buffer layers effectively enhanced the performance of YBCO.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Multidisciplinary
Fernando Maccari, Alexander Zintler, Thomas Brede, Iliya A. Radulov, Konstantin P. Skokov, Leopoldo Molina-Luna, Oliver Gutfleisch
Summary: The ferromagnetic Mn-Al-C tau-phase has potential to be developed as a permanent magnet, but its metastable nature and decomposition to nonmagnetic phases negatively affect its magnetic properties. This study investigates a novel method using electric current-assisted annealing to obtain pure tau-phase samples. Results show that increasing electric current density reduces the required temperature for phase formation, with a maximum shift of 140 degrees C at 45 A mm(-2). Magnetic properties, however, are not affected by the electric current density. Microstructural analysis reveals the nucleation of the tau-phase at grain boundaries and the presence of twin boundaries during phase growth, resulting in similar extrinsic magnetic properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Franziska Staab, Enrico Bruder, Lukas Scha, Konstantin Skokov, David Koch, Benjamin Zingsem, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch, Karsten Durst
Summary: Textured nanocrystalline SmCo5-Cu magnets are produced by high-pressure torsion (HPT) of powder blends consisting of SmCo5 and Cu powder. The process overcomes limitations imposed by the phase diagram as in conventional sintering routes, enabling a free selection of the magnetic phase and the grain boundary phase. Increasing number of rotations during HPT leads to structural refinement, increasing coercivity, and amorphous structure of strongly deformed SmCo5 particles. The magnetic hardening is attributed to microstructural refinement and magnetic decoupling of hard magnetic SmCo5 grains by Cu.
Article
Materials Science, Multidisciplinary
Benedikt Beckmann, David Koch, Lukas Pfeuffer, Tino Gottschall, Andreas Taubel, Esmaeil Adabifiroozjaei, Olga N. Miroshkina, Stefan Riegg, Timo Niehoff, Nagaarjhuna A. Kani, Markus E. Gruner, Leopoldo Molina-Luna, Konstantin P. Skokov, Oliver Gutfleisch
Summary: Ni-Mn-based Heusler alloys, especially all-d-metal Ni(-Co)-Mn-Ti, show promising potential for energy-efficient solid-state refrigeration. The study focuses on the transition entropy change and reveals a significant contribution from the structural entropy change, as well as a negative entropy change from the magnetic subsystem at lower temperatures. This phenomenon limits the utilization of these alloys for gas liquefaction at cryogenic temperatures.
Article
Materials Science, Multidisciplinary
Fernando Maccari, Tarini Prasad Mishra, Monica Keszler, Tobias Braun, Esmaeil Adabifiroozjaei, Iliya Radulov, Tianshu Jiang, Enrico Bruder, Olivier Guillon, Leopoldo Molina-Luna, Martin Bram, Oliver Gutfleisch
Summary: Flash spark plasma sintering (flash SPS) is an attractive method to obtain anisotropic Nd-Fe-B magnets with high magnetic performance by starting from melt-spun powders. The process promises electroplasticity and reduced tool wear, while maximizing magnetic properties through tailored microstructure. A parameter study reveals the importance of presintering conditions and preheating temperature on grain size and texture control. The best compromise between remanence and coercivity is achieved through a combination of specific parameters, resulting in a magnet with high energy product.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Xingmin Liu, Dan Xu, Hui Ding, Marc Widenmeyer, Wenjie Xie, Maximilian Mellin, Fangmu Qu, Guoxing Chen, Ye Shui Zhang, Zhenyu Zhang, Aasir Rashid, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Dan J. L. Brett, Anke Weidenkaff
Summary: In this study, multiscale designed Co-Mn-O spinel smart pre-catalysts were developed for the conversion of waste plastics. The carbon nanotube composites (CNCs) showed excellent catalytic performance and high H-2 yield. Density functional theory calculations suggested that the Co/MnO catalyst had excellent activity in the dissociation of alkanes. This work provides a new recipe and insights for developing advanced catalysts for waste plastic conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Yongchao Chen, Tianshu Jiang, Chuanmu Tian, Ying Zhan, Alexander Kempf, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Zhaoju Yu
Summary: A facile and cost-effective approach using single-source precursors (SSPs) to prepare active and durable bifunctional electrocatalysts consisting of core-shell structured transition metal phosphide (TMPs) nanoparticles dispersed and immobilized in a highly defective N-, P-codoped carbon matrix is proposed. The obtained FeNiP@NPC-900 catalyst exhibits promising electrocatalytic performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with low overpotentials. The unique core-shell nanostructure of FeNiP@NPC-900 protects the catalytically active phase and synergistically promotes the activity performance.
Article
Materials Science, Ceramics
Wei Li, Zhaoju Yu, Leonore Wiehl, Tianshu Jiang, Ying Zhan, Emmanuel I. I. I. Ricohermoso, Martin Etter, Emanuel Ionescu, Qingbo Wen, Christian Lathe, Robert Farla, Dharma Teppala Teja, Sebastian Bruns, Marc Widenmeyer, Anke Weidenkaff, Leopoldo Molina-Luna, Ralf Riedel, Shrikant Bhat
Summary: This research reports the high-pressure synthesis and characterization of a γ-Si3N4/Hf3N4 ceramic nanocomposite, which has superhardness and high thermal stability and is a competitive candidate for technological applications in harsh conditions.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Multidisciplinary
Ruijuan Yan, Chen Shen, Marc Widenmeyer, Ting Luo, Robert Winkler, Esmaeil Adabifiroozjaei, Ruiwen Xie, Songhak Yoon, Emmanuelle Suard, Leopoldo Molina-Luna, Hongbin Zhang, Wenjie Xie, Anke Weidenkaff
Summary: The density functional theory (DFT) calculations and experiments have confirmed that the 3d elements occupying the B position in ABC-type half-Heusler compounds are natural over-stoichiometry. In this work, Cu interstitial defects are intentionally introduced to optimize the electrical and thermal transport properties of ZrNiSn compound. The correlations between the phase structure, microstructure, and thermoelectric properties of ZrNiCuxSn (x = 0-0.20) are investigated using various techniques.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Xiao Yu, Guoxing Chen, Marc Widenmeyer, Isabel Kinski, Xingmin Liu, Ulrike Kunz, Dominique Schuepfer, Leopoldo Molina-Luna, Xin Tu, Gert Homm, Anke Weidenkaff
Summary: In this work, waste medical masks were pyrolyzed and catalytically decomposed using La0.6Ca0.4Co1-xFexO3-& delta; pre-catalysts to co-produce carbon nanomaterials and H2. The effects of reaction temperature and Co/Fe ratio in the pre-catalysts on the yields and selectivity of the products were studied. The produced carbon nanomaterials were characterized and showed promising results for energy storage applications.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Materials Science, Ceramics
Wei Li, Marc Widenmeyer, Jinxue Ding, Tianshu Jiang, Laura Feldmann, Jiongjie Liu, Leopoldo Molina-Luna, Anke Weidenkaff, Ralf Riedel, Zhaoju Yu
Summary: Single-source-precursor derived ceramics have advantages in controlling phase composition and adjustable functional/mechanical properties, making them important for (ultra)high temperature ceramic materials. In this study, hafnium/boron-containing Si3N4-based ceramics (SiHfBCN) were prepared by pyrolysis/annealing of single-source-precursors at different temperatures. The high-temperature structural evolution with respect to annealing temperatures and boron concentration was studied using different techniques. The results show that the amorphous SiHfBCN ceramics convert into nanocomposites consisting of alpha-Si3N4 matrix with embedded Si, HfB2, and HfBxCyN1-x-y upon crystallization. The formation and stability of HfBxCyN1-x-y solid solution were discussed in detail. The oxidation resistance of the obtained ceramic nanocomposites was also investigated.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Dan Xu, Chen Shen, Xingmin Liu, Wenjie Xie, Hui Ding, Marc Widenmeyer, Maximilian Mellin, Fangmu Qu, Aasir Rashid, Guoxing Chen, Emanuel Ionescu, Ye Shui Zhang, Leopoldo Molina-Luna, Jan P. Hofmann, Dan J. L. Brett, Hongbin Zhang, Anke Weidenkaff
Summary: This article develops advanced bimetallic catalysts and investigates the influence of catalyst ratio on the conversion performance. The activity of the catalysts is rationalized by density functional theory simulations. Additionally, excellent electromagnetic absorption performance of carbon nanocomposites is demonstrated.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yongchao Chen, Tianshu Jiang, Chuanmu Tian, Ying Zhan, Esmaeil Adabifiroozjaei, Alexander Kempf, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Zhaoju Yu
Summary: A simple and environmentally friendly method was used to synthesize novel nanocomposites, MoP quantum dots (QDs) were used as cores and graphitic carbon as shells. These nanoparticles were dispersed in nitrogen and phosphorus-doped porous carbon and carbon nanotubes substrates. The synthesized sample, MoP@NPC/CNT-900, showed remarkable electrocatalytic activity and durability for the hydrogen evolution reaction in both 0.5 M H2SO4 and 1 M KOH solutions.
Article
Chemistry, Physical
X. F. Liao, A. Aubert, F. Maccari, S. Riegg, S. Ener, E. Adabifiroozjaei, T. Jiang, L. Molina-Luna, K. Skokov, O. Gutfleisch
Summary: Grain boundaries play a crucial role in optimizing coercivity and densification in rare earth permanent magnets during sintering. This study focuses on grain boundary engineering of Nd-based ThMn12 magnets and their nitrides. By adjusting the Nd content and doping with Cu, the grain boundary phase properties can be controlled to enhance the sintering process and improve the relative density. However, the challenge lies in finding a suitable grain boundary for nitrides, as the existing grain boundary phase inhibits liquid-phase sintering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Khaled M. Amin, Kuan-Hsun Lin, Michael Duerrschnabel, Leopoldo Molina-Luna, Wolfgang Ensinger
Summary: This study develops highly efficient electrocatalysts for oxygen evolution reaction (OER) based on layered double hydroxides (LDHs) and a nickel nanowire network. The fabricated NiFe LDH/Ni-NWN catalyst exhibits excellent OER performance with low overpotential and favorable kinetics. Furthermore, the 3D architecture of the catalyst improves mechanical stability and provides outstanding durability. This research is important for meeting the demand for renewable energy and tackling pollution issues related to fossil fuel consumption.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
K. Riahi, I. Dirba, Y. Ablets, A. Filatova, S. N. Sultana, E. Adabifiroozjaei, L. Molina-Luna, U. A. Nuber, O. Gutfleisch
Summary: This work examines the effect of changing the ratio of different surfactants in single-core iron-based nanoparticles in the context of magnetic hyperthermia and cellular uptake by human umbilical vein endothelial cells. By modifying the surface of the magnetic nanoparticles using a mixture of two surfactants, the magnetic fluid hyperthermia heating rate was significantly improved. The biomedical relevance of the synthesized nanoparticles was demonstrated by their efficient uptake by human umbilical vein endothelial cells.
NANOSCALE ADVANCES
(2023)
