Article
Materials Science, Ceramics
Ginevra Lalle, Edoardo Rossi, Marco Sebastiani, Fabrizio Sarasini, Jacopo Tirillo
Summary: This study investigates the effects of exposure to medium-high temperatures on the mechanical properties of quartz fibers. While temperature-induced strength reduction occurs, no significant changes are observed in bulk properties such as Young's modulus, density, and fracture toughness. Failure originates from the fiber surface, and the mechanisms involved may be related to the development of surface flaws.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Patricia Suarez Ocano, Anna Manzoni, Inmaculada Lopez-Galilea, Benjamin Ruttert, Guillaume Laplanche, Leonardo Agudo Jacome
Summary: Investigated the influence of cooling rate on the microstructure, hardness, and fracture toughness of the AlMo0.5NbTa0.5TiZr alloy. Slower cooling rate resulted in a coarse structure, while the fastest cooling rate led to more cubic A2 precipitates and an increase in hardness by 10%. Fracture toughness was independent of cooling rate and averaged at approximately 4.2 MPa center dot m1/2.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Thermodynamics
Man Lei, Fa-Ning Dang, Hai-Bin Xue, Yu Zhang, Ming-Ming He
Summary: This study investigated the nanoscale mechanical properties of quartz, feldspar, and mica in granite using nanoindentation technique. Correlations between elastic modulus, hardness, and fracture toughness of the minerals were explored based on experimental data.
Article
Chemistry, Applied
Barbara Popanda, Jaroslaw Grolik, Wojciech Gieszczyk, Marcin Sroda
Summary: This study prepared a series of sol-gel hybrids using different acids, bases, solvents, and luminophore concentrations to immobilize zinc phthalocyanine. The immobilization was achieved by coordinating the zinc phthalocyanine with an isonicotinamide substituted by alkoxysilane. Hybrid materials of variable hydrophilicity were obtained by using siloxane precursors to optimize the conditions for phthalocyanine immobilization. The optical properties and photostability of the hybrids were investigated.
Article
Materials Science, Ceramics
N. Abando, H. Saad, M. A. Monclus, S. Deville, J. Molina-Aldareguia, J. J. Roa
Summary: Improving toughness in advanced ceramics often involves introducing a soft phase, which may reduce mechanical properties. Natural materials, with mechanisms operating at different length scales, demonstrate strength, stiffness, and toughness. Hardness decreases significantly with temperature in a bioinspired ceramic-ceramic composite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Chemistry, Multidisciplinary
Durga Prasad Karothu, Jad Mahmoud Halabi, Ejaz Ahmed, Rodrigo Ferreira, Peter R. Spackman, Mark A. Spackman, Pance Naumov
Summary: This paper summarizes the mechanical properties of organic crystals over the past three decades and establishes a global mechanical property profile. Organic crystals occupy a specific region in the mechanical property-density space and can be used to predict and identify mechanically robust organic crystal materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Nanoscience & Nanotechnology
Michele Tricarico, Jin-Chong Tan
Summary: Studying the mechanical behavior and structural changes of MOF monoliths is crucial for their practical applications. In this study, two zeolitic imidazolate frameworks (ZIF-8 and ZIF-71) were investigated using nanoindentation, atomic force microscopy, and spectroscopy techniques. The results provide insights into the deformation mechanisms and structural alterations of monolithic ZIF materials, which are important for understanding their mechanical properties and optimizing their performance.
MATERIALS TODAY NANO
(2022)
Article
Materials Science, Ceramics
Ming Liu, Dongyang Hou, Yan Wang, G. Lakshminarayana
Summary: The influence of Lu ion on the micromechanical properties and fracture behavior of Y3Al5O12 single crystals (YAG) was investigated by conducting indentation and scratch experiments on three different kinds of Dy3+ ion-doped (LuxY1-x)3Al5O12 (x = 0, 1/3, 1/2) single crystals. The highest (or lowest) values of hardness, elastic modulus, and fracture toughness were observed for x = 1/3 (or 1/2). The indentation size effect was explained using four different models, with the Hays-Kendall approach being the most accurate in determining the true hardness. The fracture toughness values obtained by the Vickers hardness method agreed with those obtained by scratching with a spherical indenter based on linear elastic fracture mechanics.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Yao Tang, Haofei Zhou, Haiming Lu, Xiaodong Wang, Qingping Cao, Dongxian Zhang, Wei Yang, Jian-Zhong Jiang
Summary: By adjusting processing conditions, controllable structural gradients can be designed in bulk metallic glasses, resulting in enhanced plasticity and suppression of shear localization.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Violeta Purcar, Valentin Raditoiu, Florentina Monica Raduly, Alina Raditoiu, Simona Caprarescu, Adriana Nicoleta Frone, Raluca Somoghi, Mihai Anastasescu, Hermine Stroescu, Cristian-Andi Nicolae
Summary: In recent years, various commercial coatings based on fluorinated materials have been developed using different preparation routes. However, these techniques often require expensive and complex equipment, involve multiple manufacturing steps, or are time- or cost-consuming. This study aimed to develop sustainable hydrophobic and transparent fluorinated hybrid coatings using the sol-gel method, which offers advantages such as lower cost, energy consumption, and easier implementation. The influence of perfluorooctanoic acid in the sol-gel process on the properties of the coatings was evaluated, and different silane precursors were used to synthesize hybrid silica materials. The fluorinated silica coatings showed good transparency and hydrophobicity, making them suitable for potential optical devices.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Composites
Weike Yuan, Yan Li, Jian Zhao
Summary: The 3D-CFAFRP composite material demonstrated higher interlaminar fracture toughness and tensile strength compared to 2D-CFRP composites, but slightly lower flexural and compressive strength. This is due to the lower density and cost advantages of the 3D-CFAFRP composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Polymer Science
Koichi Mayumi, Chang Liu, Yusuke Yasuda, Kohzo Ito
Summary: Slide-ring (SR) gels cross-linked by ring molecules exhibit softness, elasticity, and toughness, which are closely related to the dynamic sliding of molecular-level cross-links. The low Young's modulus and large fracture energy can be expressed by simple equations based on the degree of sliding movement. The fast sliding motion of cross-links leads to elasticity, and the dynamic fracture behaviors reveal a micro-second time scale of sliding dynamics.
Article
Chemistry, Physical
Greta Inkrataite, Meldra Kemere, Anatolijs Sarakovskis, Ramunas Skaudzius
Summary: This study investigated the impact of boron doping on YAG, YLuAG, and LuAG materials, showing that the addition of boron can indeed shorten decay time and increase emission intensity. Powder compounds containing 1% and 5% boron exhibited the most intense emission, while pure samples doped with 5% boron showed the shortest decay times.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Geological
Kouqi Liu, Zhijun Jin, Natalia Zakharova, Lianbo Zeng, Meysam Haghshenas, Adedoyin Adeyilola, Suman Saurabh
Summary: This study compares fracture toughness values obtained by two less conventional methods, nanoindentation test and scratch test, and compares them with traditional laboratory techniques. The results show that fracture toughness values derived from these two methods are very similar, suggesting that they can be used to quickly evaluate fracture toughness from shale core intervals containing both intact and nonintact parts.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Chemistry, Physical
Valeri Ivanov Petkov, Leonardo Pelcastre, Carlos Solano, Patrik Fernberg
Summary: Two thermosetting polyimide formulations based on T4HFA with different crosslinking densities were compared. The influence of crosslinking density on fracture toughness, glass transition temperature, and thermal oxidative stability was studied. The thermal and mechanical properties were investigated through various tests, and it was found that reducing crosslinking slightly increased fracture toughness but decreased the Tg of the material. No significant difference in thermal oxidative stability was observed.
Article
Materials Science, Coatings & Films
B. Moreno-Murguia, A. G. Mora-Garcia, H. Canales-Siller, A. L. Giraldo-Betancur, D. G. Espinosa-Arbelaez, J. Munoz-Saldana
Summary: The effect of particle velocity on the deposition efficiency and microstructure of copper powder on aluminum alloy substrates using Low Pressure Cold Spray (LPCS) was investigated in this study. It was found that low feed rates and low transverse speeds tend to increase deposition efficiency. Additionally, the pressure and stand-off distance also influenced the coating quality, with optimal deposition efficiency observed at specific air pressures and spray distances.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Cynthia Y. Guijosa-Garcia, Marco Antonio Rivera-Gil, C. Ramana, Ravisankar Naraparaju, Uwe Schulz, Juan Munoz-Saldana
Summary: Rare-earth zirconate pyrochlores, particularly (La,Gd)(2)Zr2O7, show promise as substitutes for 7YSZ in thermal barrier coatings due to their increased phase stability and resistance to damage at high temperatures. This study investigates the reaction products of (LaxGd1-x)(2)Zr2O7 powder mixtures with volcanic ashes of different compositions. The chemical composition of the (LaxGd1-x)(2)Zr2O7 system strongly influences the formation of reprecipitation products, reactive crystallization products, and intrinsic crystallization products. Higher Fe, Ca, Ti, and Mg contents in the volcanic ashes promote the formation of garnets, which enhance the mitigation effect against molten VAs/Si deposit damage. Overall, (La0.5Gd0.5)(2)Zr2O7 stands as a potential solution to current threats to the integrity of thermal barrier coatings.
Article
Materials Science, Multidisciplinary
M. Flores-Jimenez, Cesar Daniel Rivera Tello, J. Perez-Alvarez, O. Jimenez, J. Chavez, D. Bravo-Barcenas, J. Munoz-Saldana, M. Flores-Martinez
Summary: This study reports the tribological behavior of a superhard boron nitride film with the presence of h-BN, c-BN, and w-BN phases. The film exhibited high hardness and friction coefficient, resulting in a wear resistance almost two orders of magnitude higher than uncoated steel.
Article
Chemistry, Physical
Maria T. Ayala Ayala, Ralf Dillert, Juan Munoz Saldana, Detlef W. Bahnemann
Summary: This study reported the photocatalytic activity of different bismuth-based heterojunctions in aqueous suspension using a black body-like reactor. Photon flux was determined by chemical actinometry, and methanol oxidation was measured as a model compound. The mechanism of charge transfer in the photocatalytic reaction was demonstrated.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Materials Science, Multidisciplinary
M. E. Alvarez-Ramos, J. Alvarado-Rivera, F. Felix-Dominguez, R. C. Carrillo-Torres, R. Sanchez-Zeferino, G. Saavedra-Rodriguez
Summary: A series of TeO2-GeO2-ZnO glasses doped with Tb3+ and Eu3+ in different ratios were investigated for their luminescent and colorimetric properties in lighting devices. X-ray diffraction and Raman spectroscopy confirmed the glassy nature of the fabricated samples. The doping effects were analyzed through fluorescence and time-resolved spectroscopy. Energy transfer between Tb3+ and Eu3+ ions was observed, with Tb3+ -> Eu3+ being the main interaction type, and the CIE1931 chromaticity coordinates showed multicolor tuning from green to orange-red.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
E. Martinez-Franco, J. Trejo-Camacho, C. Ma, S. Diaz de la Torre, A. Garcia-Moreno, A. M. Benitez-Castro, G. Trapaga-Martinez, J. M. Alvarado-Orozco, J. Munoz-Saldana
Summary: In this study, particle-reinforced nanocomposites were fabricated using high-kinetic ball milling and spark plasma sintering, and their mechanical properties were characterized by multiscale indentation. The results showed that an appropriate fraction of alumina nanoparticles effectively enhanced the hardness and elastic modulus of the materials, making them promising candidates for high-temperature applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Itzel Arizbe Olivares-Torres, J. Alvarado-Rivera, Roberto Guzman-Zamudio, R. A. Iniguez-Palomares, M. E. Alvarez-Ramos
Summary: Transparent organic-inorganic SiO2-PMMA nanocomposites with different fluorescent carbon dots (CD) and rhodamine B (RB) volume ratios were prepared. The structural and photoluminescent properties of the nanocomposites were analyzed. The emission spectra showed two peaks attributed to the CD and RB, and the emission tonality varied from blue to yellowish-orange.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
J. A. Hermann-Munoz, J. A. Rincon-Lopez, R. Detschb, J. M. Alvarado-Orozco, J. Munoz-Saldana, A. R. Boccaccini
Summary: The feasibility of using (Na0.5Bi0.5)TiO3 dense ceramics as a potential biomaterial for bone repair was studied. The effect of poling direction on the osteogenic properties of (Na0.5Bi0.5)TiO3 ceramics was assessed and it was found that the negative side showed enhanced osteo-conductivity and antibacterial properties compared to the non-poled, positive side. Tunable (Na0.5Bi0.5)TiO3 ceramics have potential for bone repair applications.
CERAMICS INTERNATIONAL
(2023)
Article
Automation & Control Systems
Maricruz Hernandez-Hernandez, Rodrigo Gonzalez-Mejia, Victor Hugo Mercado-Lemus, Adriana Gallegos-Melgar, Isabel Pereyra, Juan Munoz-Saldana, Jan Mayen
Summary: Descriptive and inferential statistics were used to analyze data from the LPCS process, studying the relationship between process input variables (nozzle type, standoff distance, and particle velocity) and the output variables (coating porosity, thickness, and deposition efficiency). It was found that the nozzle type had the greatest impact on the final coating properties, with the rectangular nozzle leading to higher particle rebound and increased porosity. The round nozzle was recommended for obtaining coatings with low porosity levels, independent of the standoff distance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Environmental Sciences
Carolina Hernandez-Navarro, Sebastian Perez, Elizabeth Florez, Nancy Acelas, Juan Munoz-Saldana
Summary: Currently, the large volumes of Sargassum biomass (Sgs) arriving on Caribbean coasts are a problem that must be solved quickly. One alternative is to obtain value-added products from Sgs. In this work, Sgs is demonstrated to be a high-performance Ca -bioadsorbent for phosphate removal by a heat pretreatment at 800 degrees C that produces biochar. The calcined Sgs (CSgs) have a composition of 43.68%, 40.51%, and 8.69% of Ca (OH)2, CaCO3, and CaO, making CSgs a promising material for phosphate removal and recovery.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Coatings & Films
A. I. Gutierrez-Perez, M. T. Ayala-Ayala, A. G. Mora-Garcia, C. Hernandez-Navarro, S. Perez, J. A. Diaz-Real, J. Gonzalez Hernandez, J. Munoz-Saldana
Summary: Visible-light photoactive (Na0.5Bi0.5)TiO3 (NBT)-based heterojunctions have shown potential in environmental remediation. This study investigates the photocatalytic properties of NBT-based coatings deposited by oxyacetylene flame spray (FS) and analyzes the influence of spraying parameters on the physicochemical properties. The results demonstrate the ability of the FS methodology to produce multiphase photocatalytic coatings.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
E. Prokhorov, G. Luna-Barcenas, J. M. Yanez Limon, J. Munoz Saldana
Summary: This work investigates the properties of PVASrTiO3 nanocomposite films by varying the concentration of SrTiO3 nanoparticles. The study reveals that the piezoelectric coefficient, dielectric constant, elastic modulus, and hardness strongly depend on nanoparticle concentration due to the formation of an interface layer between PVA matrix and SrTiO3. The apparent piezoelectric coefficient is proposed to be related to the converse flexoelectric effect and Maxwell stress induced by an electric field. The fine-tuning of the interface layer with functionalized nanoparticles results in a high apparent piezoelectric coefficient.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Coatings & Films
Ivan F. Bedoya-Trujillo, Sebastian Perez, Cynthia Y. Guijosa-Garcia, Marco A. Rivera-Gil, Ravisankar Naraparaju, Juan Zarate-Medina, Juan Munoz-Saldana
Summary: The effects of ingestion of airborne particles from volcanic eruptions by aircraft turbines and their reaction with thermal barrier coatings have been studied. The reaction products of infiltration experiments of LGZO ceramics with molten ashes from the active Colima volcano were analyzed as a function of Gd3+ content. The results show that the composition of the reaction layers depends on the gadolinium content, and the amount of rare earth cations dissolved in the melt plays an important role in the precipitation of the reaction products.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
A. Hernandez-Pena, E. A. Gallardo-Hernandez, L. I. Farfan-Cabrera, M. Vite-Torres, J. Munoz-Saldana
Summary: Solid particle erosion (SPE) is a critical issue causing damage to automotive paint coatings. Correct characterization and resistance against SPE can prolong coating lifespan and increase car resale value. However, there is still a need for more understanding of wear progress under different environmental degradation conditions.
Article
Metallurgy & Metallurgical Engineering
Melquisedec Vicente-Mendoza, Alma Mora-Garcia, Juan Munoz-Saldana, Fernando Juarez-Lopez
Summary: The spray parameters were fixed for depositing an MCrAlY coating on an IN-708 substrate using the HVOF process. The deposited coatings exhibited a microstructure with characteristic splats and β and γ phases. A subsequent MOCVD process was conducted to deposit a thin alumina layer on the sprayed MCrAlY coating. Cyclic oxidation tests were performed at high temperature on the alumina/MCrAlY coating system, and SEM and XRD analyses were used for characterization.
HIGH TEMPERATURE CORROSION OF MATERIALS
(2023)
