Article
Engineering, Chemical
Cui Wang, Yong Zeng, Lingfeng Shen, Yue Yang, Wei Sun, Xuefeng Cao, Honghu Tang
Summary: With the rapid development of lithium-ion batteries, the recycling of spent lithium-ion batteries, particularly the separation of LiFePO4 and graphite electrode materials, poses a significant challenge. In this study, a novel flotation reagent regime using H acid as a depressor was proposed to enhance the flotation separation performance. The results showed promising recovery rates of LiFePO4 and graphite using the proposed method, and the interaction between H acid and the electrode materials was mainly through pi-pi interaction. This study provides a new method for the efficient separation and recovery of LiFePO4 and graphite electrode materials from spent lithium iron phosphate batteries.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Aranganathan Viswanathan, Adka Nityananda Shetty
Summary: The use of a mixture of mineral acid and organic acid as an electrolyte improved the energy storage performance of rGO12%:Cu2O/CuO40%:PANI48% (G12CP) nanocomposite. The SA + MSA mixture provided significantly higher energy storage performance than traditional sulfuric acid and methanesulfonic acid mixtures, and the stability was significantly enhanced after 5000 cycles of charge and discharge.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
R. N. Bhowmik, R. J. Choudhary, Priyanka Mitra, V. R. Reddy, A. K. Sinha
Summary: The study demonstrates the enhancement of ferromagnetic properties in Ga doped hematite thin films grown using Pulsed Laser Deposition technique, with unusual magnetic spin order and exchange bias effect observed at reduced dimensions (2D). Magnetic parameters such as magnetization and coercivity show dependence on composition, deposition conditions, and heat treatment. The chemical states of Fe ions in the films vary between high spin Fe3+ and Fe2+ states based on composition.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Multidisciplinary
Petr Opletal, Hironori Sakai, Yoshinori Haga, Yoshifumi Tokiwa, Etsuji Yamamoto, Shinsaku Kambe, Yo Tokunaga
Summary: We studied the physical properties of a single crystal of uranium telluride U7Te12. It was found that U7Te12 crystallizes in a hexagonal structure with three different crystallographic uranium sites. The paramagnetic moments were estimated to be approximately 1 µB per uranium site assuming a uniform moment on all the sites. A ferromagnetic phase transition occurred at TC = 48 K, with a sharp increase in in-plane magnetization while the out-of-plane component did not increase significantly. Further below TC under field-cooling conditions, the out-of-plane component increased rapidly around T* = 26 K, while the in-plane component showed little change at T*. Specific heat measurement indicated a crossover suggesting a reorientation of ordering moments or successive magnetic ordering of the multiple uranium sites.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Materials Science, Composites
Nor Helya Iman Kamaludin, Hanafi Ismail, Arjulizan Rusli, Sung Ting Sam
Summary: In this study, tannic acid-treated chitosan-filled polylactic acid biocomposites were prepared and characterized. The addition of tannic acid and chitosan improved the physical properties of the materials, promoted crystallization, and enhanced thermal stability.
POLYMER COMPOSITES
(2022)
Article
Environmental Sciences
Mohammad Nabi, Dawen Gao, Hong Liang, Lang Cheng, Wenbo Yang, Yuqi Li
Summary: This study investigated the impact of graphite addition on anaerobic digestion and membrane fouling mitigation in anaerobic membrane bioreactor (AnMBR) treating landfill leachate. The results showed that graphite addition can improve organics removal, biogas production, methane content, and reduce membrane fouling.
ENVIRONMENTAL RESEARCH
(2022)
Article
Construction & Building Technology
Peitao Qiu, Lianying Zhang, Yan Li, Bing Li, Jiong Zhu, Chao Ma, Xiaoxi Bi, Yang Yu
Summary: The study found that the permeability of CPC decreases with decreasing pH of the sulphuric acid solution and increasing cement content, promoting both hydration and corrosion.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
M. V. O. Moutinho, G. S. N. Eliel, A. Righi, R. N. Gontijo, M. Paillet, T. Michel, Po-Wen Chiu, P. Venezuela, M. A. Pimenta
Summary: Twisted bilayer graphene is an intriguing system for tuning electronic and optical properties by controlling the twisting angle between layers. Raman spectroscopy is a fundamental tool in studying TBG, revealing distinct enhancement of different phonons through intralayer and interlayer processes. Experimental results are nicely explained by theoretical calculations of double-resonance Raman intensity in graphene, showing the impact of quantum interference and symmetry requirements on the resonant Raman response.
SCIENTIFIC REPORTS
(2021)
Article
Construction & Building Technology
Jhutan Chandra Kuri, Prabir Kumar Sarker, Faiz Uddin Ahmed Shaikh
Summary: The geopolymer mortar made by mixing ground ferronickel slag (GFNS) with fly ash exhibits better sulphuric acid resistance than neat fly ash geopolymer mortar, with lower strength loss observed after 12 months of acid exposure. This improvement is attributed to the formation of N-M-A-S-H gel, which creates a more compact microstructure and reduces sulphuric acid ingress. Additionally, the lower deterioration in fly ash-GFNS geopolymer compared to neat fly ash geopolymer is due to the formation of a lower amount of expansive gypsum, as indicated by QXRD analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Faiza Hassan, Muhammad Sher, Muhammad Ajaz Hussain, Mubshara Saadia, Muhammad Naeem-Ul-Hassan, Muhammad Fayyaz ur Rehman, Muhammad Tahir Haseeb, Syed Nasir Abbas Bukhari, Azhar Abbas, Bo Peng, Fariha Kanwal, Huibiao Deng
Summary: This study aimed to enhance the solubility of amoxicillin using the solid dispersion technique. Different solid dispersions were prepared and analyzed to determine their properties. The results showed improved solubility and sustained release of the drug, confirming the effectiveness of the spray drying technique.
Article
Engineering, Chemical
S. K. Mahanta, U. Balaji, S. K. Pradhan, S. Suman, K. J. Sankaran
Summary: This study focuses on improving the quality and yield of graphene oxide/graphite oxide (GO) production through modifications of the Hummers method. By adjusting factors such as the quantity of oxidant and the duration of ultrasonic-assisted oxidation, the oxidation efficiency and the yield of defect-free GO were enhanced.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Swapna Sindhu Mishra, Robert M. Klaes, Joshua Willard, Reza Loloee, Norman O. Birge
Summary: In this study, we investigated the magnetic behavior and supercurrent transmission properties of Ni/NiFe/Ni trilayers in Josephson junctions. The trilayers showed good magnetic switching properties and a fourfold increase in the maximum supercurrent compared to pure NiFe junctions.
Article
Materials Science, Multidisciplinary
R. Das, J. Alonso, E. M. Jefremovas, L. Fernandez Barquin, P. K. Ngoc, H. T. Nguyen, D. T. Viet, P. V. Vinh, A. T. Duong
Summary: 11 nm diameter quasi-spherical and single phase CuO/Cu2O nanocomposites with different CuO:Cu2O ratios were synthesized using solvothermal process. The magnetic properties of the nanocomposites were found to be influenced by the presence of Cu2O phase.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Andrej Thurzo, Viera Jancovicova, Miroslav Hain, Milan Thurzo, Bohuslav Novak, Helena Kosnacova, Viera Lehotska, Ivan Varga, Peter Kovac, Norbert Moravansky
Summary: This paper introduces a new method for three-dimensional reconstruction of dental patterns and human remains identification. Using modern methods such as micro-computed tomography, cone-beam computer tomography, and attenuated total reflection, along with Fourier transform infrared spectroscopy and artificial intelligence convolutional neural network algorithms, the study examines the morphology of teeth, bone, and dental materials under the impact of sulfuric acid.
Article
Materials Science, Multidisciplinary
Sugam Shukla, Alexander Chernyaev, Petteri Halli, Jari Aromaa, Mari Lundstroem
Summary: This study investigates the leaching behavior of aluminium from waste pharmaceutical blister packages in sulphuric acid media in order to develop strategies for aluminium recycling. The results indicate that passivation of aluminium during leaching can be reduced by using dilute sulphuric acid solutions at high temperatures and with H2O2 addition. The leaching mechanism involves electrochemical dissolution of aluminium oxidized by H+ or H2O2, followed by fast passivation by Al2O3 and subsequent chemical dissolution of Al2O3. The calculated activation energy suggests that the leaching reaction is controlled by the chemical or electrochemical reaction step. By leaching the waste, an aluminium sulphate solution can be obtained for further valorization.
Article
Physics, Applied
B. Semenenko, B. C. Camargo, A. Setzer, W. Boehlmann, Y. Kopelevich, P. D. Esquinazi
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Instruments & Instrumentation
L. Botsch, N. Raatz, S. Pezzagna, R. Staacke, R. John, B. Abel, P. D. Esquinazi, J. Meijer, S. Diziain
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Materials Science, Multidisciplinary
Regina Ariskina, Michael Schnedler, Pablo D. Esquinazi, Ana Champi, Markus Stiller, Wolfram Hergert, R. E. Dunin-Borkowski, Philipp Ebert, Tom Venus, Irina Estrela-Lopis
Summary: In this study, Tunneling Atomic Force Microscopy (TUNA) was used to investigate the current-voltage characteristics of highly oriented graphite samples with different stacking orders. It was found that adjusting the model to consider surface band bending due to a finite contact potential allowed for quantitative agreement between simulated and measured tunnel spectra. This research reveals insights into the electronic properties of graphite surfaces with different stacking configurations.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Condensed Matter
Annette Setzer, Pablo D. Esquinazi, Olesya Daikos, Tom Scherzer, Andreas Poeppl, Robert Staacke, Tobias Luehmann, Sebastien Pezzagna, Wolfgang Knolle, Sergei Buga, Bernd Abel, Jan Meijer
Summary: The experiment showed that the presence of magnetic C centers in nitrogen-doped diamond crystals is responsible for the large hysteresis behavior observed, and reducing the concentration of these centers can completely suppress the phenomenon. Additionally, partial recovery of the hysteresis behavior was observed after annealing the samples at high temperatures in vacuum.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Chemistry, Physical
Annette Setzer, Pablo D. Esquinazi, Sergei Buga, Milena T. Georgieva, Tilo Reinert, Tom Venus, Irina Estrela-Lopis, Andrei Ivashenko, Maria Bondarenko, Winfried Boehlmann, Jan Meijer
Summary: In this study, we demonstrated that cutting diamond crystals with a laser can produce a magnetic ordered layer at the surface with a thickness of less than or similar to 20 nm. The ferromagnetic response was observed only when the crystals were cut along the (100) surface orientation. The magnetic order is attributed to the disordered graphite layer produced by the laser on the diamond surface, and it can be eliminated by chemical etching or moderate temperature annealing.
Article
Chemistry, Physical
Regina Ariskina, Markus Stiller, Christian E. Precker, Winfried Boehlmann, Pablo D. Esquinazi
Summary: Granular superconductivity at high temperatures can occur in graphite at certain two-dimensional stacking faults. A permanent current path was observed using magnetic force microscopy, and its position was found to drift with time. Scratches on the sample surface cause changes in the location of the current path and irreversible destruction of the remanent state at room temperature.
Article
Chemistry, Physical
Christian E. Precker, Jose Barzola-Quiquia, Mun K. Chan, Marcelo Jaime, Pablo D. Esquinazi
Summary: Despite decades of experimental studies and theoretical proposals, there is still a lack of overall interpretation for the complex behavior of magnetoresistance in multilayer graphene at high fields and broad temperature range. Stacking faults (SFs) contribute to the complexity in most thick enough multilayer graphene samples. A procedure is proposed to extract the SF contribution to the magnetoresistance measured at various temperatures and magnetic fields. The magnetoresistance behavior of some SFs resembles that of granular superconductors with a critical temperature of approximately 350 K, consistent with recent publications. The measurements were conducted on a multilayer graphene TEM lamella, contacting the edges of the two-dimensional SFs.
Article
Materials Science, Multidisciplinary
Amitesh Paul, Pablo D. Esquinazi, Carlos Ivan Zandalazini, Annette Setzer, Wolfgang Knolle
Summary: Manipulation and control of defects using an electron beam allows for defect engineering in layered materials. We investigated topologically stable helices in a [Dy(10 nm)/Tb(10 nm)](30) multilayer under MeV electron irradiation up to a maximum fluence of 9.58 x 10(18) e/cm(2). The electron irradiation resulted in defect-induced magnetic manipulation, increasing the blocking/freezing temperature of spin-frustrated interfaces by 4% and reducing the interfacial exchange bias coupling by 45%. This presents the opportunity to tailor spintronic devices through direct manipulation of pinning centers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Richard Monge, Tom Delord, Nicholas V. Proscia, Zav Shotan, Harishankar Jayakumar, Jacob Henshaw, Pablo R. Zangara, Artur Lozovoi, Daniela Pagliero, Pablo D. Esquinazi, Toshu An, Inti Sodemann, Vinod M. Menon, Carlos A. Meriles
Summary: A broad effort is being made to understand and utilize the interaction between superconductors and spin-active color centers, with the goal of hybrid quantum devices and novel imaging techniques for superconducting materials. However, most work ignores the interplay between either system and the environment created by the color center host. In this study, a diamond scanning probe is used to investigate the spin dynamics of a single nitrogen-vacancy (NV) center near a superconducting film. The presence of the superconductor is found to increase the NV spin coherence lifetime, which may be attributed to a change in the electric noise caused by a redistribution of charge carriers due to the superconductor. These findings not only shed light on the dynamics of shallow NV spin coherence, but also offer new possibilities for noise spectroscopy and imaging of superconductors.
Article
Physics, Multidisciplinary
Markus Stiller, Pablo D. Esquinazi
Summary: Magnetic order induced by atomic lattice defects can be observed at room temperature in various non-magnetic hosts. Pure TiO2 (anatase) shows an ultrathin magnetic layer with perpendicular magnetic anisotropy at its surface when triggered by low-energy ion irradiation.
FRONTIERS IN PHYSICS
(2023)
Article
Physics, Condensed Matter
Jose Barzola-Quiquia, Maria Priscila Zelaya, Omar Espindola, Oscar Marin-Ramirez, David Comedi, Pablo D. Esquinazi, Monica Tirado
Summary: The magnetotransport properties of microstructured c- and a-plane ZnO thin films grown on a- and r-plane sapphire substrates were investigated. The contributions of grain and grain boundaries to electrical transport were verified through impedance spectroscopy. Photoluminescence measurements showed that both samples had maxima related to oxygen and zinc vacancies (V-Zn), which can contribute to ferromagnetic behavior, especially V-Zn. The resistance temperature dependence indicated the presence of two different mechanisms, with variable-range hopping dominating at temperatures T <= 30 K, and thermally activated transport dominating at higher temperatures. The magnetoresistance of all samples between 2 and 250 K was negative, indicating the presence of spin-scattering processes. Hall-effect measurements revealed that the samples were n-type, but had a small anomalous-like contribution related to different types of charge carriers.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Lukas Botsch, Pablo D. Esquinazi, Carsten Bundesmann, Daniel Spemann
Summary: In recent years, there has been a trend towards developing ferromagnetic materials by introducing defects into nonmagnetic host materials. However, the controversy remains regarding whether these materials are technologically relevant ferromagnets. Research on the emergence of a ferromagnetic phase upon ion irradiation shows that a bulk magnetic phase emerges in the high-energy regime, while an ultrathin magnetic layer forms at low ion energies.
Article
Materials Science, Multidisciplinary
Andreas Hentrich, Pablo D. Esquinazi
C-JOURNAL OF CARBON RESEARCH
(2020)
Article
Physics, Applied
V Zviagin, C. Sturm, P. D. Esquinazi, M. Grundmann, R. Schmidt-Grund
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Markus Stiller, Alpha T. N'Diaye, Hendrik Ohldag, Jose Barzola-Quiquia, Pablo D. Esquinazi, Thomas Amelal, Carsten Bundesmann, Daniel Spemann, Martin Trautmann, Angelika Chasse, Hichem Ben Hamed, Waheed A. Adeagbo, Wolfram Hergert
