Article
Materials Science, Ceramics
Xiaojiao Yu, Mingzhong Wang, Yu Rao, Yinsheng Xu, Mengling Xia, Xianghua Zhang, Ping Lu
Summary: This article investigates the nucleation and crystallization of glass-ceramics, which are influenced by early phase separation. It also provides direct evidence of nanoscale clustering in the glassy phase prior to nucleation and crystallization. The effect of phase separation on nucleation and final crystallize products is elucidated.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Youngjun Ahn, Mathew J. Cherukara, Zhonghou Cai, Michael Bartlein, Tao Zhou, Anthony DiChiara, Donald A. Walko, Martin Holt, Eric E. Fullerton, Paul G. Evans, Haidan Wen
Summary: Ultrafast first-order phase transitions show distinct transition pathways and properties, accompanied by nanoscale structural dynamics. Understanding these transitions is important for applications involving fast switching of properties.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Ceramics
Lianshun Zhang, Tuo Wang, Qiqi Hou, Qi Hao, Jichao Qiao
Summary: Phase separation is observed in the glassy matrix of a certain bulk metallic glass after deformation, leading to the formation of Cu-rich and Zr, Fe-rich zones. The deformed material shows increased intensity of beta-relaxation and free volume, exhibiting a work-hardening behavior and higher compressive plasticity compared to the undeformed material, which is attributed to microstructural heterogeneity and rejuvenation caused by the deformation.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Sicheng Lu, Fang Yin, Yujia Wang, Nianpeng Lu, Lei Gao, Huining Peng, Yingjie Lyu, Youwen Long, Jia Li, Pu Yu
Summary: This study explores the structural phase transition of brownmillerite SrCoO2.5 and its influencing factors. It is found that using aqueous alkali as the electrolyte can trigger a rapid transition, while the acid solution with rich protons can also induce an unexpected phase transition in a faster manner. Theoretical calculations reveal that this transition is caused by a proton-assist ionic disproportionation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Editorial Material
Microbiology
Francesca Di Nunzio
Summary: In a recent Cell paper, Zhang et al. discovered that stress-induced changes in intra-condensates can activate dormant viruses. These findings provide insights into the intricate interplay between viruses and their hosts, opening up new avenues for further research in the field.
CELL HOST & MICROBE
(2023)
Article
Nanoscience & Nanotechnology
Sebastian P. Schwaminger, Karin Schwarzenberger, Jacqueline Gatzemeier, Zhe Lei, Kerstin Eckert
Summary: The research demonstrated the utilization of iron oxide nanoparticles for flotation processes based on magnetically induced heteroagglomeration. The zero remanent magnetization of the nanomaterial allows for reversible aggregation, facilitating process control in flotation. Magnetic carrier flotation using iron oxide nanoparticles could potentially lead to new recycling processes for microplastic wastes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Pascal Puphal, Yu-Mi Wu, Katrin Fursich, Hangoo Lee, Mohammad Pakdaman, Jan A. N. Bruin, Jurgen Nuss, Y. Eren Suyolcu, Peter A. van Aken, Bernhard Keimer, Masahiko Isobe, Matthias Hepting
Summary: In this study, the topotactic reduction of La1-xCaxNiO3 single crystals to La1-xCaxNiO2+delta using CaH2 as the reducing agent was successfully achieved. The transformation from the three-dimensional perovskite to the quasi-two-dimensional infinite-layer phase was characterized by various techniques, demonstrating that the electronic properties of the specimens resemble those of epitaxial thin films.
Article
Materials Science, Multidisciplinary
V Mowlika, C. S. Naveen, A. R. Phani, A. Sivakumar, S. A. Martin Britto Dhas, R. Robert
Summary: The systematic study explored the impact of shock waves on prepared cobalt ferrite nanoparticles, analyzing the results using X-ray diffraction, spectroscopic, and microscopic techniques. Evaluation of the crystallographic phase and molecular finger-print was carried out using XRD and Raman spectroscopy, while morphological characteristics were examined through SEM. The magnetic behavior performance was monitored using VSM, revealing the potential to reconfigure the magnetic properties of CoF NPs for soft magnetic applications without altering the original crystalline phase.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Ceramics
V. A. Dudnikov, Yu S. Orlov, L. A. Solovyov, S. N. Vereshchagin, S. Yu Gavrilkin
Summary: A new anion-deficient Sr2.4Dy0.6Co2O7-delta perovskite phase has been synthesized and characterized, showing specific crystal parameters and oxygen vacancy distribution. The compound exhibits stability under various atmospheres and reversible oxygen absorption/release at high temperatures. Additionally, magnetic properties and electrical conductivity changes have been investigated in detail.
CERAMICS INTERNATIONAL
(2021)
Article
Pharmacology & Pharmacy
Adrian Krummnow, Andreas Danzer, Kristin Voges, Stefanie Dohrn, Samuel O. Kyeremateng, Matthias Degenhardt, Gabriele Sadowski
Summary: This study provides a thermodynamic analysis of the release mechanism of amorphous solid dispersions (ASDs) composed of ritonavir and poly(vinylpyrrolidone-co-vinyl acetate). The observed release behavior is explained based on the quantitative thermodynamic phase diagram predicted by PC-SAFT. Liquid-liquid phase separation in the dissolution medium and amorphous phase separation in the ASD are linked back to the same thermodynamic origin, and they occur simultaneously in the investigated system.
Article
Nanoscience & Nanotechnology
Ludovica Maugeri, Giuseppe Forte, Maria Anna Messina, Massimo Camarda, Giorgio Ventimiglia, Grazia Maria Letizia Consoli, Salvatore Petralia
Summary: An unprecedented one-pot photochemical method for preparing water-soluble and photothermal nanoparticles of beta-cyclodextrin (β-CD)/Co3O4 capped with Cobalt((II/III)) is reported. These nanoparticles demonstrated the ability to induce photothermal enzymatic reactions and in situ formation of gold nanoparticles. The high water solubility and good photothermal conversion efficiency across a wide range of wavelengths make β-CD/Co3O4 nanoparticles promising candidates for photothermal applications in the biomedical field.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Hamdi Ben Yahia, Kota Motohashi, Atsushi Sakuda, Akitoshi Hayashi
Summary: A new binary sodium magnesium sulfide (Na6MgS4) was synthesized by mechanochemical synthesis from Na2S and MgS. Na6MgS4 is highly sensitive to oxygen traces and partially decomposes. Excess MgS was used in the milling process to successfully reduce the impurity ratio from 38% (Na2S + MgO) to 13% MgO. The crystal structure and properties of Na6MgS4 were characterized by various techniques, and it was found to be isostructural to Na6ZnO4. Additionally, indium-doped samples (Na6-x Mg1-x In x S4) with improved ionic conductivities were prepared.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jungjin Park, Hongbo Zhao, Stephen Dongmin Kang, Kipil Lim, Chia-Chin Chen, Young-Sang Yu, Richard D. Braatz, David A. Shapiro, Jihyun Hong, Michael F. Toney, Martin Z. Bazant, William C. Chueh
Summary: Layered oxides electrodes in lithium-ion batteries are designed to be cycled under conditions avoiding phase transitions, but phase separation during delithiation has been observed, which is shown to be a dynamical artefact occurring in a many-particle system driven by autocatalytic electrochemical reactions.
Article
Materials Science, Ceramics
Gisele G. Santos, Oscar Peitl, Akio Koike, Shusaku Akiba, Shigeki Sawamura, Mikio Nagano, Yoshitaka Saijo, Susumu Harako, Satoshi Yoshida, Edgar D. Zanotto
Summary: In this study, the mechanical properties of different glass samples were investigated, and it was found that the spinodal glass exhibited the best performance, with a 50% increase in K-Ic and a 90% increase in S-f compared to other samples. The microstructural effect of the spinodal glass was identified as the most significant factor for its superior mechanical properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Crystallography
Bertrand Poumellec, Maxime Cavillon, Matthieu Lancry
Summary: Over the past two decades, numerous studies have been conducted on the effect of femtosecond laser pulses in oxide glasses, identifying both thermal and light-induced effects. Among the light-induced effects, the formation of nanogratings, which are asymmetric parallel nanoplanes perpendicular to the laser polarization, has been observed in various glasses and crystalline compounds. The exact formation process of nanogratings, which can result in nanoporous phase separation, crystallization, or nanocracks, remains uncertain. This paper proposes an approach based on the modification of electrochemical potential by electronic excitation to explain the formation process.
Article
Chemistry, Physical
Michele Carosso, Eleonora Vottero, Sara Morandi, Maela Manzoli, Davide Ferri, Thibault Fovanna, Riccardo Pellegrini, Andrea Piovano, Elena Groppo
Summary: The decomposition of ethanol over two Pd/Al2O3 catalysts was investigated using transmission FT-IR and ATR-IR spectroscopies. The regularity of Pd particles and initial Pd oxidation state were found to significantly impact the products formed, with ethanol oxidation to acetates being the kinetically favored reaction path. The presence of a solvent also dampened the decarbonylation process due to competition for surface sites.
Article
Physics, Applied
Sha Zhang, Ting Fu, Tao Wang, Xiaolong Fan, Meizhen Gao, Zhiwei Li, Fashen Li
Summary: In this study, the gyromagnetic ratio gamma of hcp-Co1-xIrx soft magnetic films was investigated through both experimental electric detection of ferromagnetic resonance and first-principles calculations. The linear increase of gamma from pure Co film to CoIr alloy with x = 0.23 was confirmed by the calculations, with the primary reason attributed to the different trends in spin and orbital magnetic moments of neighboring Co atoms. The study provides important data for the application of CoIr soft magnetic films in high-frequency electromagnetic and spintronic devices, as well as offers insights into the dynamic magnetic properties in disordered binary magnetic alloys.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Correction
Materials Science, Multidisciplinary
Jia Yu, Congcong Le, Zhiwei Li, Lisi Li, Tong Liu, Zengjia Liu, Bo Zhang, Bing Shen, Binbin Ruan, Zhi'an Ren, Meng Wang
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jia Yu, Congcong Le, Zhiwei Li, Lisi Li, Tong Liu, Zengjia Liu, Bo Zhang, Bing Shen, Binbin Ruan, Zhi'an Ren, Meng Wang
Summary: This study investigates the physical properties of the (Eu,La)FeAs2 system with double magnetic sublattices. La doping enhances magnetic anisotropy and reveals a special exchange bias in superposed ferromagnetic/superconducting loop. The coexistence of Eu-related ferromagnetism, Fe-related robust antiferromagnetism, and superconductivity is observed in Eu0.8La0.2FeAs2.
NPJ QUANTUM MATERIALS
(2021)
Article
Chemistry, Physical
Michele Carosso, Thibault Fovanna, Alberto Ricchebuono, Eleonora Vottero, Maela Manzoli, Sara Morandi, Riccardo Pellegrini, Andrea Piovano, Davide Ferri, Elena Groppo
Summary: This study thoroughly investigated the adsorption phenomena occurring at the surface of a highly-dispersed Pt/Al2O3 catalyst for hydrogenation reactions using transmission IR spectroscopy in the gas-phase and ATR-IR spectroscopy in the liquid-phase. The presence of a selected solvent greatly affected the reducibility of Pt and competed with the adsorbates for the occupancy of surface sites, affecting the shape, position, and intensity of the infrared signals corresponding to the surface Pt-H and Pt-CO species.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Eleonora Vottero, Michele Carosso, Riccardo Pellegrini, Andrea Piovano, Elena Groppo
Summary: This study presents a multi-technique method for the identification and quantification of functional groups in activated carbons, and characterizes seven different carbons used in catalysis. The novel approach is capable of accurately detecting and quantifying released gases.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Eleonora Vottero, Michele Carosso, Alberto Ricchebuono, Monica Jimenez-Ruiz, Riccardo Pellegrini, Celine Chizallet, Pascal Raybaud, Elena Groppo, Andrea Piovano
Summary: This study investigates the properties of a highly dispersed Pt/Al2O3 catalyst for industrial hydrogenation and dehydrogenation reactions using inelastic neutron scattering (INS) spectroscopy and DFT simulation. The results show that the INS spectra provide a unique fingerprint of the Pt/Al2O3 model morphology, size, H-coverage, and typology of Pt-H species.
Article
Multidisciplinary Sciences
Carolina A. Marques, Luke C. Rhodes, Izidor Benedicic, Masahiro Naritsuka, Aaron B. Naden, Zhiwei Li, Alexander C. Komarek, Andrew P. Mackenzie, Peter Wahl
Summary: The phenomenon and radical changes observed in material properties during a quantum phase transition have attracted significant attention in condensed matter research in recent decades. Strong electronic correlations give rise to exotic electronic ground states, such as magnetic order, nematicity, and unconventional superconductivity. A detailed understanding of the electronic structure near the Fermi energy is necessary to provide a microscopic model for these phenomena and achieve a complete understanding of the physics of the quantum critical point.
Article
Chemistry, Physical
Alberto Ricchebuono, Eleonora Vottero, Andrea Piovano, Elena Groppo, Pascal Raybaud, Ceïline Chizallet
Summary: This article evaluates the performance of several low-cost methods in reproducing structural features of Pt nanoparticles of different sizes, and finds that some methods show a preference for amorphous geometries.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Lei Ding, Claire Colin, Virginie Simonet, Chris Stock, Jean-Blaise Brubach, Marine Verseils, Pascale Roy, Victoria Garcia Sakai, Michael M. Koza, Andrea Piovano, Alexandre Ivanov, Jose A. Rodriguez-Rivera, Sophie de Brion, Manila Songvilay
Summary: The dynamical properties of the multiferroic MOF candidate [CH3NH3][Co(HCOO)(3)] and its coupling between the molecules and the framework have been thoroughly investigated using various experimental techniques. The results indicate that the molecule undergoes freezing of its reorientational motions and lattice parameters change during the modulated phase transition, but no significant change is observed in the lattice dynamics during the magnetic ordering, suggesting the absence of a substantial magnetoelectric coupling in zero field.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Siobhan M. Tobin, Jian-Rui Soh, Hao Su, Andrea Piovano, Anne Stunault, J. Alberto Rodriguez-Velamazan, Yanfeng Guo, Andrew T. Boothroyd
Summary: We conducted neutron scattering measurements on YbMnSb2 to investigate the magnetic moments and their interaction with Dirac fermions. Our results revealed that the magnetic moments are localized on the Mn atoms in the paramagnetic phase, and the interlayer exchange in YbMnSb2 is significantly larger than in similar compounds with Bi instead of Sb. We argue that the coupling between the Mn local magnetic moments and the topological band states is more significant in YbMnSb2 compared to the Bi compounds.
Article
Materials Science, Multidisciplinary
A. Perrichon, A. Piovano, M. Boehm, M. H. Lemee, M. Ceretti, W. Paulus
Summary: The lattice dynamics of oxygen-doped Nd2NiO4+delta were studied using single-crystal neutron spectroscopy, ab initio molecular dynamics (AIMD), and harmonic phonon calculations. The AIMD-computed inelastic response matched better with the experimental inelastic neutron spectra than the harmonic phonon calculations. The presence of extra oxygen in interstitial sites led to significant differences in the system's dynamics compared to the stoichiometric parent compound, including the detection of a nondispersive scattering signal and enhanced anharmonic displacements.
Article
Materials Science, Multidisciplinary
David Msika, Dalila Bounoua, Olivier Demortier, Francoise Damay, Romuald Saint-Martin, Rolf Heid, Alexandre Ivanov, Andrea Piovano, Frederic Bourdarot, David Berardan, Loreynne Pinsard-Gaudart, Sylvain Petit
Summary: This paper focuses on the thermal transport properties of antiferromagnetic spin chains cuprates. The spinons, chain magnetic excitations, participate in heat transport at low temperature, but spinon heat transport decays well below room temperature, possibly due to a coupling with phonons. Through inelastic neutron scattering, we extensively studied the lattice dynamics of spin chain compounds Sr2CuO3, Ca2CuO3, and double spin-chain compounds SrCuO2. We conclude that there are no obvious anomalies in the phonon dispersions, suggesting a weak spinon-phonon coupling regime.
Article
Materials Science, Multidisciplinary
Shelby R. Turner, Stephane Pailhes, Leila Ben-Mahfoud, Marc de Boissieu, Frederic Bourdarot, Helmut Schober, Yvan Sidis, John-Paul Castellan, Andrea Piovano, Alexandre Ivanov, Valentina M. Giordano
Summary: Cubic yttria-stabilized zirconia is a ceramic material widely used in thermal applications due to its low and weakly temperature-dependent thermal conductivity. This study presents experimental evidence of the phonon dispersions in this material, revealing the presence of low-lying optical modes throughout the Brillouin zone, which affects the pure acoustic characteristics of some branches. Additionally, the energy dependence of the intrinsic acoustic phonon linewidths suggests the existence of competing Mie and Rayleigh scattering mechanisms. These findings contribute to a deeper understanding of heat transport in yttria-stabilized zirconia.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Multidisciplinary
Masato Matsuura, Takahiko Sasaki, Makoto Naka, Jens Mueller, Oliver Stockert, Andrea Piovano, Naoki Yoneyama, Michael Lang
Summary: The low-temperature state of the quantum spin liquid candidate K-(BEDT-TTF)2Cu2(CN)3 undergoes an anomaly at T*, which is revealed by the drastic change in phonon damping. This change is attributed to a phase transition into a valence bond solid state based on an effective model describing the spin-charge coupling in this system.
PHYSICAL REVIEW RESEARCH
(2022)