Article
Materials Science, Ceramics
Bo Yang, Zhongxia Shang, Jin Li, Xin Li Phuah, Jaehun Cho, Haiyan Wang, Xinghang Zhang
Summary: This study compares the effects of direct current (DC) and alternative current (AC) fields on the microstructure and defect distribution in flash-sintered ceramics. It is found that DC sintering results in asymmetrical distributions of grain sizes and defects, while AC sintering produces more homogeneous microstructures. Additionally, a reverse-polarity flash sintering technique is demonstrated to achieve dense TiO2 samples with homogeneous microstructure and tunable defect gradient.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Jinming Zhang, Wei Ding, Uwe Hampel
Summary: This study deconstructs a complex surface defect into three primary surface defects and uses large-scale Molecular Dynamics simulations to investigate the mechanisms of droplet-solid static friction forces induced by these defects. Three element-wise static friction forces related to the primary surface defects are revealed, and it is found that the static friction force induced by chemical heterogeneity is contact line length dependent while the static friction force induced by atomic structure and topographical defect is contact area dependent. The latter causes energy dissipation and leads to a wiggle movement of the droplet during the static-kinetic friction transition.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Khaloud Moosa Al Balushi, Khellil Sefiane, Daniel Orejon
Summary: This study investigates the effects of liquid surface tension and solid structure on the wetting and non-wetting behavior of droplets on solid substrates. The results show that the wetting behavior and droplet asymmetry are influenced by the liquid composition and structure spacing. A wetting regime map for a wide range of surface tension fluids and solid fractions is proposed.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xiong Wang, Xiao Yan, Jiayu Du, Bingqiang Ji, Mohammad Jalal Inanlu, Qi Min, Nenad Miljkovic
Summary: The spreading behavior of microdroplets differs from larger droplets due to the influence of size and surface tension. Experiments showed that the initial spreading of smaller droplets is shorter with reduced oscillation damping compared to millimeter-scale droplets. The coupling between spreading velocity and dynamic contact angle may have applications in microscale heat transfer, advanced manufacturing, and aerosol transmission studies.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Limin Zhou, Shumin Yang, Nannan Quan, Zhanli Geng, Shuo Wang, Binyu Zhao, Xingya Wang, Yaming Dong, Renzhong Tai, Jun Hu, Lijuan Zhang
Summary: This study investigates the formation of surface nanodroplets on nanostructure surfaces, demonstrating that nanostructure patterning can effectively regulate the shape, contact radius, and nucleate site of nanodroplets. Nanodroplets exhibit different wetting properties on different structures, and the physical geometry and chemical heterogeneity of the substrate affect the growth and spreading of nanodroplets.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
Yinan Dong, Roya Zandi, Alex Travesset
Summary: This letter addresses the problem of characterizing the structure of an elastic network constrained to a frozen curved surface. It proposes a new approach based on nonlinear elasticity without using any approximation. The results show agreement with linear elasticity beyond its strict range of applicability. The implications for virus assembly are also discussed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Ceramics
Lukas Porz, Michael Scherer, Qaisar Khushi Muhammad, Kimitaka Higuchi, Yan Li, Shuhei Koga, Atsutomo Nakamura, Wolfgang Rheinheimer, Till Froemling
Summary: Blacklight sintering technology enables rapid densification of ceramics with precise process control and excellent material quality.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Construction & Building Technology
Jiayun Xu, Biao Ma, Shulin Zhou, Weijie Mao, Xiaoqing Wang
Summary: Based on the Wenzel model and Cassie model, this paper established a new wetting model for irregular rough surfaces and calculated the wetting depth and apparent contact angle. The experimental results showed significant differences in the surface texture parameters of different aggregates. The relative error between the predicted and measured contact angles was less than 15%, indicating excellent prediction effect. The wetting model analysis revealed that the surface tension of the test liquid, lithology of the solid aggregate, surface roughness, and texture structure are important control parameters affecting wetting.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Adrien Bussonniere, Qingxia Chad Liu, Peichun Amy Tsai
Summary: This study investigates the wetting state and stability of an air layer trapped in micro-structures, plastron, under intense acoustic waves. The results show that the plastron behaves like a water-air interface at low acoustic intensity, and a wetting transition can be triggered by a sufficiently large acoustic radiation pressure at moderate intensity. Cavitation clouds appear under strong excitation, their sizes and positions depending on the surface acoustic boundary condition.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Peter D. Hicks
Summary: The application of Wagner theory to non-flat droplet impacts on continuous substrates is studied in this paper. Both single and double impacts are analyzed, and the effect of separation between impact sites on the free surface, loads, and moments is evaluated. The formation and saturation of voids between the droplet and substrate are also investigated. The evolution of the free surface and the influence of periodic roughness on the contact line are examined. Results show that double impacts enhance liquid penetration and increase load and moment on the substrate.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Polymer Science
Sai Ankit Etha, Parth Rakesh Desai, Harnoor Singh Sachar, Siddhartha Das
Summary: Using MD simulations, we studied the spreading and imbibition of a liquid drop on a porous, soft, solvophilic, and responsive surface represented by a layer of polymer molecules grafted on a solvophilic solid. Our findings suggest that the drop spreading is influenced by the density of polymer grafting and the transition of polymer molecules from a crumpled state to a brush-like state when wetted by the liquid drop. Additionally, we quantified the temporal dynamics of polymer chain swelling and the wetting-mediated globule-to-brush transition process, providing insights for designing liquid-infused surfaces with responsive polymer grafted solids.
Article
Chemistry, Multidisciplinary
Katharina I. Hegner, Chirag Hinduja, Hans-Ju''rgen Butt, Doris Vollmer
Summary: Methods for fabricating super-liquid-repellent surfaces have traditionally relied on perfluoroalkyl substances, but concerns over their environmental and health effects have sparked interest in fluorine-free alternatives. Polydimethylsiloxane (PDMS) is a promising candidate, although it only exhibits superhydrophobicity instead of liquid repellency. In this study, we demonstrate that a well-designed two-tier structure of silicon dioxide nanoparticles and surface-tethered PDMS chains can achieve super-liquid-repellency towards low surface tension liquids. Our work highlights the feasibility of scalable fabrication methods and environmentally friendly surface functionalization for fluorine-free super-liquid-repellent surfaces.
Article
Mechanics
Kevin R. Murphy, Jonathan B. Boreyko
Summary: When a sessile droplet contacts an opposing solid surface, the droplet can transfer based on wettabilities and surface velocity. This study used high-speed imaging to capture the transfer process from a solid substrate to a porous surface, varying parameters such as wettability, pore size, droplet volume, and working fluid. The transfer process is divided into wetting and wicking regimes, with wicking being significantly longer than wetting. The wetting regime has two sub-regimes, donor-independent and donor-dependent, while the wicking regime follows Darcy's law to complete the transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Gissela Constante, Indra Apsite, Dennis Schoenfeld, Thorsten Pretsch, Leonid Ionov
Summary: In this study, the fabrication of light-sensitive high-aspect ratio surfaces with switchable topography is reported, which involves using melt-electrowriting of shape-memory polymers and deposition of light-to-heat converting black ink by dip coating. The surfaces can be locally deformed and recovered by water droplets due to the softening of the polymer upon illumination. The developed approach and materials are demonstrated to be suitable for the fabrication of smart light-controlled valves for the controlled mixing of fluids in microfluidic devices.
Article
Chemistry, Physical
Q. Legrand, S. Benayoun, S. Valette
Summary: This study investigates the anisotropic wetting on textured surfaces. Three stripe-like textures with different heights were created using three different polymers. The contact angle in all directions was measured using a lab-built goniometer. Two different behaviors, correlated to the wetting state, were observed. The Wenzel state showed strong anisotropy, with the contact angle following a Gaussian evolution. The Cassie-Baxter state, on the other hand, exhibited no anisotropy, with the contact angle remaining constant and close to the predicted value. This study deepens our understanding of droplet anisotropy by linking it to surface textures and chemistry.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Tadeja Katan, Rupert Kargl, Tamilselvan Mohan, Tobias Steindorfer, Miran Mozetic, Janez Kovac, Karin Stana Kleinschek
Summary: Stable chitosan thin films can serve as promising substrates for creating nanometric peptide-bound polyglucosamine layers, with structural similarities to bacterial peptidoglycans. Various characterization techniques were employed to investigate the surface chemistry and confirm the acetylation and coupling of peptides on the chitosan films, indicating potential to mimic bacterial cell wall structures.
Article
Biochemical Research Methods
Jernej Ekar, Peter Panjan, Sandra Drev, Janez Kovac
Summary: The study investigated the influence of flooding gas during ToF-SIMS depth profiling to reduce matrix effects and improve the quality of depth profiles. The application of different atmospheres during SIMS depth profiling improved the results.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2022)
Article
Energy & Fuels
Kristijan Brecl, Marko Jost, Matevz Bokalic, Jernej Ekar, Janez Kovac, Marko Topic
Summary: The research shows that perovskite solar cells exhibit high PID resistance under +/-500 V bias, but rapid degradation is observed with -1000 V bias due to the ingress of sodium ions. Positively biased devices show no degradation under high voltage exposure, indicating promising signs for current PV system designs.
Article
Chemistry, Multidisciplinary
Marina M. Maletic, Ana M. Kalijadis, Vladimir Lazovic, SneZana Trifunovic, Biljana M. Babic, Alesandra Dapcevic, Janez Kovac, Marija M. Vukcevic
Summary: N-doped TiO2/carbon composites with different nitrogen content were prepared and characterized. It was found that N doping improved the adsorption capacity but decreased the photocatalytic efficiency. However, TiO2/CN0.05 composite obtained under specific conditions showed high efficiency in removing pollutants.
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Luka Suhadolnik, Marjan Bele, Miha Cekada, Primoz Jovanovic, Nik Maselj, Anja Loncar, Goran Drazic, Martin Sala, Nejc Hodnik, Janez Kovac, Tiziano Montini, Michele Melchionna, Paolo Fornasiero
Summary: A versatile approach for producing cluster- and single atom-based thin-film electrode composites is described in this article. The TiOxNy-Ir catalyst developed in this study was prepared from sputtered Ti-Ir alloy with 0.8 +/- 0.2 at % Ir in alpha-Ti solid solution. The prepared catalyst exhibited high oxygen evolution reaction activity and has potential applications in electrocatalysis. The article provides a detailed description of the new method and a high-performance thin film catalyst, along with suggestions for future development in this field.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Stanislav Campelj, Matic Pobreznik, Tomas Landovsky, Janez Kovac, Layla Martin-Samos, Vera Hamplova, Darja Lisjak
Summary: In this study, MNPs were successfully functionalized with CAT, GAL, CAF, and NDA at different pH values. The functionalized MNPs showed higher saturation magnetizations (M-s) compared to the starting material. XPS analyses confirmed the presence of Fe(III) ions on the surface, ruling out the formation of magnetite. DFT calculations demonstrated that the adsorption of catechols did not affect the M-s. The increase in the average size of the MNPs and the decrease in the fraction of the smallest MNPs explained the observed increase in M-s values.
Article
Crystallography
Monika Kuster, Janez Kovac, Zoran Samardzija, Matej Komelj, Sorour Semsari Parapari, Matejka Podlogar, Jean-Marie Dubois, Saso Sturm
Summary: Super-hydrophobic surfaces and coatings have been extensively studied to improve wetting properties. The time dependence of the oxide layer and surface adsorbates on the surface topography of an Al59Cu25Fe13B3 quasicrystalline material were analyzed in relation to changes in wettability. The study found that the growth of the oxide layer and surface roughness have an impact on the wetting behavior of the material.
Article
Infectious Diseases
Zoran M. Markovic, Aleksandra S. Misovic, Danica Z. Zmejkoski, Nemanja M. Zdravkovic, Janez Kovac, Danica V. Bajuk-Bogdanovic, Dusan D. Milivojevic, Marija M. Mojsin, Milena J. Stevanovic, Vladimir B. Pavlovic, Biljana M. Todorovic Markovic
Summary: Developing new medicines for infectious diseases is currently a major challenge. Carbon quantum dots, a new member of the carbon nanomaterials family, show potential as visible-light-triggered antibacterial agents. This study investigates the antibacterial and cytotoxic activities of gamma-ray-irradiated carbon quantum dots, finding that they have antibacterial activity and are non-toxic to human cells.
Article
Nanoscience & Nanotechnology
Marjan Bele, Gorazd Koderman Podborsek, Anja Loncar, Primoz Jovanovic, Armin Hrnjic, Ziva Marinko, Janez Kovac, Angelja Kjara Surca, Ana Rebeka Kamscek, Goran Drazic, Nejc Hodnik, Luka Suhadolnik
Summary: Introducing the Nano Lab, a novel experimental platform aimed at accelerating the discovery and understanding of promising electrocatalysts. It enables state-of-the-art physicochemical characterization and atomic-scale tracking of individual synthesis steps as well as subsequent electrochemical treatments targeting nanostructured composites. The platform's compatibility with ex situ characterization and other analytical methods allows for a comprehensive understanding of structural changes and their effects.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hsin-Chia Ho, Milutin Smiljanic, Zoran Jovanovic, Miha Cekada, Janez Kovac, Gertjan Koster, Jiri Hlinka, Nejc Hodnik, Matjaz Spreitzer
Summary: This study developed a robust photocathode using low-cost and high-performing materials, such as p-Si, for efficient and durable production of clean fuel hydrogen. The utilization of pulsed laser deposition (PLD) technique and a buffer layer of reduced graphene oxide (rGO) allowed for the preparation of a high-quality SrTiO3 (STO) layer that passivates the p-Si substrate. The study demonstrated that the epitaxial STO layer on rGO-buffered Si provided the highest onset potential and improved charge separation and transfer compared to counterparts with thicker or nonepitaxial STO layers. The importance of having a well-defined passivation layer and the stability of the epitaxial STO layer in corrosion resistance was also highlighted.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Ziga Jelen, Janez Kovac, Rebeka Rudolf
Summary: This study successfully conjugated SARS-CoV-2 S1 spike protein fragments with gold nanoparticles (AuNPs) synthesized with Ultrasonic Spray Pyrolysis (USP). The conjugation mechanism was investigated and confirmed through gel electrophoresis and X-ray Photoelectron Spectroscopy analysis. The study highlights the potential use of AuNPs synthesized with USP as sensors in colorimetric or electrochemical sensors and LFIA tests.
Article
Nanoscience & Nanotechnology
Niharika Rawat, Metka Bencina, Domen Paul, Janez Kovac, Katja Lakota, Polona Zigon, Veronika Kralj-Iglic, Hsin-Chia Ho, Marija Vukomanovicc, Ales Iglic, Ita Junkar
Summary: Cardiovascular diseases are a major cause of death globally. Existing cardiovascular stents often lead to restenosis and thrombosis, highlighting the need for superior biomaterials. This study investigated two surface treatment procedures to optimize the surface properties of titanium medical implants and assessed their biological responses. The findings indicate the significant influence of surface treatment on cell interactions, offering insights for designing multifunctional biomaterial surfaces that promote specific cell types' proliferation, which is crucial for the advancement of vascular implants.
ACS APPLIED BIO MATERIALS
(2023)
Article
Chemistry, Analytical
Jaka Olenik, Vasyl Shvalya, Martina Modic, Jernej Ekar, Janez Kovac, Uros Cvelbar, James L. Walsh
Summary: Fourier transform infrared spectroscopy (FTIR) is commonly used to study gas-phase reactive oxygen and nitrogen species (RONS). However, the presence of interfering peaks in spectral data poses challenges. This study investigates the interaction between reactive oxygen and nitrogen species generated by a non-equilibrium air plasma and the metal halide windows of an FTIR gas cell, leading to the appearance of spurious absorption peaks. Various spectroscopic techniques were employed to determine the origin of these peaks and it was found that KBr exposed to plasma showed a lower fraction of bromine and the formation of NO3 nitrate group. The evolution of these absorption peaks affected the window transparency and was correlated with KNO3 formation, plasma power, and exposure time.
JOURNAL OF ANALYSIS AND TESTING
(2023)
Article
Chemistry, Multidisciplinary
Vesna Ribic, Vanja Jordan, Sandra Drev, Janez Kovac, Goran Drazic, Aleksander Recnik
Summary: Water interaction with mineral surfaces is crucial for photocatalytic processes. This study investigates the atomistic structure, atomic structure, and surface chemistry of fibrous rutile TiO2 in the presence of water. The results show that the specific interface structure can induce acidic response in a neutral medium.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Venkata D. B. C. Dasireddy, Natasa Zabukovec Logar, Janez Kovac, Blaz Likozar
Summary: The effect of oxygen mobility and nature in the V2O5-WO3/TiO2 catalyst on n-butane oxidative dehydrogenation was studied. The presence of NO resulted in high selectivity towards butadiene. The co-existence of O-2/NO favored butadiene production, and the presence of oxygen in the catalyst lattice promoted the insertion of oxygen into the lattice, leading to increased butadiene synthesis yield.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
