Article
Chemistry, Multidisciplinary
T. Wesley Surta, Thomas A. Whittle, Matthew A. Wright, Hongjun Niu, Jacinthe Gamon, Quinn D. Gibson, Luke M. Daniels, William J. Thomas, Marco Zanella, Philippa M. Shepley, Yang Li, Anton Goetzee-Barral, Andrew J. Bell, Jonathan Alaria, John B. Claridge, Matthew J. Rosseinsky
Summary: The study demonstrates a distinctive approach to lead-free piezoelectrics based on the relaxor parent material KBMN, where the roles of K+ and Bi3+ ions in the perovskite structure are crucial for the thermal and electrical behavior and ultimately enhance performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Xi Shi, Udo Eckstein, Yizhe Li, David Hall, Neamul H. Khansur
Summary: In situ, spatially-resolved synchrotron X-ray diffraction was used to investigate the electric field-induced phase transformation of nonergodic relaxor 0.93Na(1/2)Bi(1/2)TiO(3)-0.07BaTiO(3) ceramics. The study found that the copper electrode side coated by aerosol deposition exhibited more significant lattice strain and domain texture compared to the platinum side deposited by sputter deposition.
JOURNAL OF MATERIOMICS
(2022)
Article
Multidisciplinary Sciences
Danae N. Polsin, Amy Lazicki, Xuchen Gong, Stephen J. Burns, Federica Coppari, Linda E. Hansen, Brian J. Henderson, Margaret F. Huff, Malcolm McMahon, Marius Millot, Reetam Paul, Raymond F. Smith, Jon H. Eggert, Gilbert W. Collins, J. Ryan Rygg
Summary: This study investigates the effects of extreme pressure on sodium and reveals the occurrence of temperature-driven polymorphism and the formation of an electride phase.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Wanlin Wang, Yong Gang, Jian Peng, Zhe Hu, Zichao Yan, Weihong Lai, Yanfang Zhu, Dominique Appadoo, Mao Ye, Yuliang Cao, Qin-Fen Gu, Hua-Kun Liu, Shi-Xue Dou, Shu-Lei Chou
Summary: Prussian blue analogs (PBAs) are promising cathode materials for sodium-ion batteries due to their low cost, comparable energy density and long cycle life. However, the crystal water in PBAs can have significant side effects on battery performance. Researchers have developed a heat-treatment method to remove water from PBAs, improving their high temperature storage performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Manish Badole, Hari Narayanan Vasavan, Samriddhi Saxena, Asish Kumar Das, Velaga Srihari, Sunil Kumar
Summary: The effects of La3+ and Al3+ substitution on the structural, dielectric, and piezo-electric properties of (1-x)(K0.5Bi0.5)TiO3-xLaAlO3 ceramics were investigated. With the increase in LAO content, a decrement in tetragonal distortion and an increase in cubic symmetry were observed. The incorporation of LAO in KBT resulted in an improved relaxor behavior and a suppression of oxygen vacancies. The piezo-electric properties were enhanced, with the 3% LAO-doped sample exhibiting the highest piezo-electric charge coefficient and improved piezo-electric voltage coefficient. An energy harvesting experiment was performed on the poled 3% LAO-doped ceramic, showing promising results under normal finger tapping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Simon R. Larsen, Daniel Hedlund, Henry Stopfel, Dennis Karlsson, Christian K. Christensen, Peter Svedlindh, Johan Cedervall
Summary: The alloys of AlCoCrFeMnxNi were synthesized through arc-melting and gas atomisation to study the effect of Mn additions. It was found that an increase in Mn content adversely affected the thermal stability and saturation magnetisation of the alloy compared to AlCoCrFeNi.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Evgenii Igorevich Mareev, Fedor Viktorovich Potemkin
Summary: In this study, an ultrafast reversible phase transition in silicon under ultrafast pressure loading was demonstrated using molecular dynamics. Effective indicators of phase-transition dynamics, including atomic volume, centrosymmetry, and the X-ray diffraction spectrum, were revealed. The breakthrough in registering the latter in actual experimental conditions paves the way for simple X-ray optical cross-correlation and pump-probe experiments.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Physics, Applied
Ann-Katrin U. Michel, Felix Donat, Aurelia Siegfried, Olesya Yarema, Hanbing Fang, Maksym Yarema, Vanessa Wood, Christoph R. Mueller, David J. Norris
Summary: GeTe is a phase-change material with four different structural states, which has been studied for applications in photonics, thermoelectrics, ferroelectrics, and spintronics. Nanoparticles of GeTe exhibit size-dependent properties, showing potential for various applications.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Crystallography
Shinobu Aoyagi, Ayumi Aoyagi, Hiroaki Takeda, Hitoshi Osawa, Kazushi Sumitani, Yasuhiko Imai, Shigeru Kimura
Summary: Lead-containing relaxor ferroelectrics exhibit significant piezoelectric capabilities due to their heterogeneous structures. Time-resolved nanobeam X-ray diffraction reveals the local lattice strain and Bragg intensity distributions under an alternating electric field, demonstrating the presence of nanodomains with different responses within the measured local area. The dynamic motion of nanodomains in the heterogeneous structure enables large piezoelectric lattice strain and fatigue-free ferroelectric polarization switching.
Article
Materials Science, Multidisciplinary
Hiroshi Nakajima, Satoshi Hiroi, Hirofumi Tsukasaki, Charlotte Cochard, Florence Porcher, Pierre-Eymeric Janolin, Shigeo Mori
Summary: This study observed coexisting monoclinic structures and polar nanoregions near the Morphotrophic phase boundaries (MPBs) in Pb(Yb1/2Nb1/2)O-3-PbTiO3. The polar nanoregions in this material are randomly shaped and grow as the temperature decreases. Pair-distribution function analysis revealed a mixture of monoclinic Pm and Cm structures in the polar nanoregions without the rhombohedral structure found in other Pb-based relaxor solid solutions.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Sergey Sumnikov, Ivan A. Bobrikov, Igor S. Golovin, Anatoly M. Balagurov
Summary: The crystal structure of bulk quenched Fe-27Ga alloy was studied using high-resolution neutron and X-ray diffraction to determine phase distribution. The presence of additional phases B2 and A2, in addition to the ordered D0(3) phase, was observed in the surface layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yongjin Zhao, Toyotaka Nakae, Satoshi Takeya, Mineyuki Hattori, Daisuke Saito, Masako Kato, Yoshinori Ohmasa, Shun Sato, Osamu Yamamuro, Tomasz Galica, Eiji Nishibori, Shiori Kobayashi, Tomohiro Seki, Teppei Yamada, Yoshinori Yamanoi
Summary: A thermoresponsive structural change based on a disilane-bridged bis(pyridine) ligand and CuI is reported. Single-crystal X-ray analysis revealed two polymorphs in the Cu(I) complex: an octanuclear copper(I) complex at 20 degrees C and a 1D staircase copper(I) polymer complex at -173 degrees C. The formation of these polymorphs is attributed to the flexibility of the ligand. Cooling the sample from -10 degrees C to -170 degrees C resulted in Cu-I bond formation. DSC, VT-PXRD, and VT-photoluminescence measurements clarified the temperature-induced phase transition progression, indicating a reversible temperature-controlled crystal-to-crystal phase transition. Crystal cracking during single-crystal to single-crystal transitions between these polymorphic forms was observed using a high-speed camera.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Viliam Hakala, Dimitra K. Manousou, Konstantin Glazyrin, Wilson A. Crichton, Karen Friese, Andrzej Grzechnik
Summary: A simple method for growing single crystals of alpha-V2O5 is presented and discussed in this research. It is found that alpha-V2O5 irreversibly amorphizes above a certain pressure, while the crystal structure of alpha-V6O13 remains stable up to at least 9.4 GPa.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
R. Frison, J. Kuespert, Qisi Wang, O. Ivashko, M. V. Zimmermann, M. Meven, D. Bucher, J. Larsen, Ch. Niedermayer, M. Janoschek, T. Kurosawa, N. Momono, M. Oda, N. B. Christensen, J. Chang
Summary: A combined x-ray and neutron diffraction study was conducted on the stripe-ordered superconductor La₀Sr₀.₁₂CuO₄. The crystal structure was found to be consistent with the orthorhombic Bmab space group commonly reported in the literature. However, this structure is not symmetry compatible with the second-order phase transition into the stripe order phase. Many forbidden Bragg peaks in the Bmab space group were observed in this study, and the analysis revealed monoclinic lattice distortions consistent with charge stripe order.
Article
Chemistry, Inorganic & Nuclear
Sumit Ranjan Maity, Brajesh Tiwari, Martando Rath, M. S. Ramachandra Rao
Summary: A composition-driven structural phase transition in the ferroelectric PbZrxTi1-xO3 (PZT) system near the morphotropic phase boundary (MPB) has been investigated. The system exhibits a coexistence of tetragonal and rhombohedral phases. The Raman spectrum and photoluminescence emission spectrum provide insights into the structural transition and the resonance Raman effect in PZT ceramics.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Automation & Control Systems
B. S. de Lima, W. A. S. Silva, A. L. Ndiaye, V. R. Mastelaro, J. Brunet
Summary: This article introduces an open-source graphical user interface (GUI) that aims to simplify the analysis process of dynamic response-recovery curves of resistive semiconductor-based gas sensors. The software allows for simultaneous analysis of multiple samples and provides the source code and data analysis examples.
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
(2022)
Article
Environmental Sciences
Elaine Cristina Paris, Joao Otavio Donizette Malafatti, Ailton Jose Moreira, Lilian Cruz Santos, Camila Rodrigues Sciena, Alessandra Zenatti, Marcia Tsuyama Escote, Valmor Roberto Mastelaro, Miryam Rincon Joya
Summary: In this study, photocatalytic CuO nanoparticles were successfully decorated on a magnetic support for efficient water remediation and bactericidal control under visible light irradiation. The nanocomposite exhibited high photocatalytic activity, magnetic recoverability, and low toxicity to the environment and organisms.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Analytical
Priscila Fernanda Pereira Barbosa, Valmor Roberto Mastelaro, Eduardo Guimaraes Vieira, Devaney Ribeiro do Carmo
Summary: A synthesis method for the functionalization of beta-cyclodextrin (beta-Cd) with polyamide dendrimer PAMAM G.0 and the formation of a mixed-valence complex (beta-Cd-PAMAM-Ag/Fe) with silver and potassium hexacyanoferrate (III) was proposed. The material was characterized using SEM, FTIR, XRD, EDS, and EPR. The electrochemical behavior of the hybrid complex was investigated, and optimal analytical responses were obtained by evaluating various parameters. The beta-Cd-PAMAM-Ag/Fe material showed successful application in the electrocatalytic oxidation of dopamine using CV and SWV.
Article
Chemistry, Physical
Ailton J. Moreira, Dyovani Coelho, Jeferson A. Dias, Lucia H. Mascaro, Gian P. G. Freschi, Valmor R. Mastelaro, Ernesto C. Pereira
Summary: In this study, a synergistic use of microwave energy and Microwave Discharge Electrodeless Lamp (MDEL) as a UV_Vis light source was applied for the first time to synthesize a photocatalyst (Smdoped TiO2) for degrading atrazine (ATZ) under UV-A light. The doped material showed lower recombination rates and higher performance in ATZ degradation compared to pristine TiO2 and Sm-doped TiO2. The photocatalytic degradation mechanism indicated that the doped material exhibited high efficiency in activating the ATZ hydrolysis reaction and generating more hydroxyl radicals. Moreover, the photoactivity of the catalyst remained stable even after multiple application cycles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Weverton A. dos Santos Silva, Bruno S. de Lima, Maria I. B. Bernardi, Valmor R. Mastelaro
Summary: The study demonstrates that chemical etching can enhance the sensitivity of ZnO thin films for gas sensing by increasing surface defect density, surface area, and decreasing average grain size.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Article
Electrochemistry
Devaney Ribeiro do Carmo, Murilo Santos Peixoto, Alexsandro dos Santos Felipe, Valmor Roberto Mastelaro, Fernanda dos Santos Franco
Summary: In this study, a polyhedral oligomeric silsesquioxanes (POSS) modified with zinc and ferrocyanide was prepared to create an electroactive nanohybrid material (SZnH) for developing an electrochemical sensor to detect isoniazid. The SZnH-modified graphite paste electrode (GPSZn) demonstrated high sensitivity to isoniazid concentrations, with two linear response ranges from 1.0 x 10(-5) to 1.0 x 10(-3) mol l(-1).
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Materials Science, Paper & Wood
Maria Fernanda Felippe Silva, Joao Vitor Felippe Silva, Higor Rogerio Favarim, Cristiane Inacio de Campos
Summary: The aim of this study was to evaluate the influence of adding zinc oxide nanoparticles on the physical-mechanical properties and heat transfer of Oriented Strand Board panels. The results showed that the addition of ZnO nanoparticles improved the dimensional stability of the panels and increased the screw withdraw strength. Furthermore, boards with nanoparticles had a faster temperature increase during hot-pressing, while the control treatment had a higher final temperature.
MADERAS-CIENCIA Y TECNOLOGIA
(2023)
Article
Materials Science, Paper & Wood
Heloiza Candeia Ruthes, Herisson Ferreira dos Santos, Victor Almeida De Araujo, Maximiliano dos Anjos Azambuja, Vinicius Borges de Moura Aquino, Eduardo Chahud, Luiz Antonio Melgayo Nunes Branco, Higor Rogerio Favarim, Cristiane Inacio de Campos, Francisco Antonio Rocco Lahr, Andre Luis Christoforo
Summary: Tropical species play a significant role in construction, and their physical and mechanical properties greatly influence the design of structures, particularly the strength and stiffness of wood. However, testing equipment costs have limited research centers from conducting tests under the ABNT NBR 7190 (1997) guidelines in Brazil. This study proposes estimating wood toughness using the compression strength parallel to the grain, which is more easily obtained. Initial values of these properties were obtained for 20 tropical wood species from the South American region, and statistical analysis showed that a linear model provided better predictions than a quadratic model.
Article
Chemistry, Physical
Laura O. Libero, Lara K. Ribeiro, Luis I. Granone, Maria S. Churio, Josiane C. Souza, Valmor R. Mastelaro, Juan Andres, Elson Longo, Lucia H. Mascaro, Marcelo Assis
Summary: This study reports on the immobilization of Fe-2(MoO4)(3) in chitosan films and its effect on the oxidation reaction of sulfide derivatives. The catalyst showed good yields and excellent selectivity, even tolerating oxidatively sensitive functional groups. The key success of the selective oxidation was attributed to the presence of hydroxyl radical, center dot OH, and the Fe3+/Fe2+ Fenton-like process. Additionally, the synergistic effect between Fe-2(MoO4)(3) and chitosan was demonstrated in the selective oxidation of sulfides to sulfones. This work provides a design strategy for efficient catalysts that can be applied to other semiconductors and oxidation processes.
Article
Environmental Sciences
Natalia Gabriele Camparotto, Tauany de Figueiredo Neves, Valmor Roberto Mastelaro, Patricia Prediger
Summary: In this study, highly hydrophobic chitosan beads were prepared as adsorbents for removing organic contaminants from water. The chitosan beads exhibited high porosity, large pore space, and excellent hydrophobicity. The beads showed efficient adsorption capacities for sildenafil citrate, basic blue 26 dye, and cetylpyridinium chloride, and were also effective in fixed-bed experiments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Inorganic & Nuclear
H. Moreno, G. L. Domingues, M. Assis, P. P. Ortega, V. R. . Mastelaro, M. A. . Ramirez, A. . Z. Simoes
Summary: This study investigates the morphology and photocatalytic properties of CeO2 nanocrystals synthesized using microwave-assisted solvothermal method with acetone and ethanol as solvents. The results show that CeO2 synthesized in acetone has more emission peaks in the blue region, possibly due to higher Ce3+ concentration, while CeO2 synthesized in ethanol exhibits a strong orange-red emission, suggesting the presence of oxygen vacancies. CeO2 synthesized in acetone demonstrates superior photocatalytic response compared to that synthesized in ethanol, possibly due to increased disorder in the CeO2 structure, leading to enhanced light absorption.
INORGANIC CHEMISTRY
(2023)
Article
Agricultural Engineering
Luiz Eduardo Campos Filho, Adrielly Csala Steigenberger, Romulo Henrique Batista Martins, Wanley Eduardo Lopes Junior, Higor Rogerio Favarim, Eliria Maria de Jesus Agnolon Pallone, Maria Teresa de Alvarenga Freire, Milena Martelli Tosi, Juliano Fiorelli
Summary: This study evaluated medium density OSB panels manufactured using commercially sourced and laboratory-produced aluminum oxide nanoparticles. The results indicated that commercial aluminum oxide nanoparticles provided better performance in microstructural and qualitative analysis, as well as an increase in physical-mechanical properties.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Chemistry, Physical
Francielle Candian Firmino Marcos, Maria Jose Fonseca Costa, Gabriel L. Catuzo, Daniel Angeli de Moraes, Marcos de Oliveira Jr, Valmor Roberto Mastelaro, Jose Mansur Assaf, Reinaldo Giudici, Elisabete Morreira Assaf
Summary: xCu/MOF catalysts were synthesized by impregnation of copper precursor on UiO-66 support and characterized using various techniques. The 20Cu/MOF catalyst, with the highest copper loading, exhibited the best methanol formation rate and CO2 conversion due to the strong metal-support interaction and the highest amount of missing linker defects in the MOF structure.
JOURNAL OF CATALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Raul L. Ferreira, Walter Muniz Jr, Louise E. A. Souza, Hector M. C. Navarro, Lucas R. de Mello, Valmor R. Mastelaro, Tasso O. Sales, Cintya D. A. E. S. Barbosa, Adriana S. Ribeiro, Emerson R. da Silva, Melissa F. Landell, Italo N. de Oliveira
Summary: This study investigates the physicochemical and antimicrobial properties of carbon dots derived from the methyl red azo dye. The results show that these carbon dots exhibit low cytotoxicity and tunable photoluminescence, and can generate reactive oxygen species (ROS) with a high singlet oxygen quantum efficiency. They also demonstrate strong antimicrobial activity against healthcare-relevant pathogens.
ACS APPLIED BIO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Guilherme K. Maron, Mateus G. Masteghin, Veridiana Gehrke, Lucas S. Rodrigues, Jose H. Alano, Jessica H. H. Rossato, Valmor Roberto Mastelaro, Jairton Dupont, Marcia Tsuyama Escote, S. Ravi P. Silva, Neftali Lenin Villarreal Carreno
Summary: This study demonstrates an enhanced fabrication technique using CO2 infrared lasers to pattern micro-supercapacitor electrodes. The direct-written laser-induced graphene (LIG) micro-supercapacitors with NiCo2S4 nanoparticles exhibited outstanding properties, including high specific capacitance and energy density, as well as excellent capacitance retention and flexibility. These findings suggest the potential use of LIG/NiCo2S4 MSC in the next generation of flexible and miniaturized portable devices.
MATERIALS RESEARCH BULLETIN
(2023)
