Article
Polymer Science
Yeming Xian, Zhixin Kang, Xianrong Liang
Summary: This study discusses the effects of amino functionalization on MWCNTs and DNDs introduction on the rheology, dynamic mechanical properties, and thermal stability of MWCNTs epoxy-based nanocomposites. It was found that pristine MWCNTs increase viscosity and lower the molecular weight of epoxy chains, while amino functionalization can mitigate these effects. Additionally, introducing DNDs can improve T-g and limit phase separation.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Physics, Multidisciplinary
Adway Kumar Das, Anandamohan Ghosh, Ivan M. Khaymovich
Summary: In this study, we introduce a new discrete model that exhibits both localized and extended states without forming a mobility edge. By locally mapping the model, we confirm the coexistence of localized and extended states and analytically estimate the fractal dimensions of the extended states.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Qi Qin, Jing Chen, Changze Wu, Yixue Wang, Yunan Li, Meng Song
Summary: Novel carbon nanostructures, carbon nanobuds and nanoballs, have been successfully synthesized on the surface of graphene using the electrochemical method. Under a certain potential, carbon nanobuds are grown in situ on the surface of graphene, and with the increase of potential, these nanobuds grow into nanoballs and exfoliate from the graphene surface. Graphene undergoes oxidation at higher potentials, resulting in the formation of graphene oxide fragments.
Article
Physics, Applied
S. M. Kuznetsova, J-P Groby, L. M. Garcia-Raffi, V Romero-Garcia
Summary: We report the localization of an acoustic wave at the interface between two one-dimensional hyperuniform materials of different geometrical representations, which suppress acoustic scattering in the long wavelength regime and possess a wide band gap. These materials are made of an air-filled acoustic waveguide with rigid diaphragms acting as scatterers, offering promising applications in wave control devices with wide band gap and emergence of edge modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Jin-Xu Qin, Xi-Gui Yang, Chao-Fan Lv, Yi-Zhe Li, Xue-Xia Chen, Zhen-Feng Zhang, Jin-Hao Zang, Xun Yang, Kai-Kai Liu, Lin Dong, Chong-Xin Shan
Summary: The negative photoconductivity effect has been observed in nanodiamonds for the first time, attributed to carriers being trapped by absorbed water molecules on the ND surfaces under 660 nm laser illumination. A humidity sensor was constructed based on this effect, with a sensitivity reaching 10^6%, the highest reported for carbon-based humidity sensors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Qinwei An, Wenqi Xiong, Feng Hu, Yikang Yu, Pengfei Lv, Siqi Hu, Xuetao Gan, Xiaobo He, Jianlin Zhao, Shengjun Yuan
Summary: We have successfully grown high-quality WS2 and WSe2 nanotubes on Si substrates using catalytic chemical vapour deposition with Au nanoparticles. The Au nanoparticles act as nucleation sites for the growth of WS2 or WSe2 shells, which subsequently seed the growth of nanotubes. We find that the growth mode of nanotubes is sensitive to temperature and have achieved around 79% WS2 nanotubes with single chiral angles, primarily at 30 degrees (approximately 37%) and 0 degrees (approximately 12%). Furthermore, we demonstrate the tunability of geometric, electronic, and optical properties of WS2 nanotubes through their chirality.
Article
Biotechnology & Applied Microbiology
Stefania Sandoval, Gerard Tobias
Summary: Fullerenes are employed as versatile agents to cork the open tips of MWCNTs and to promote the release of inorganic material filled within the nanotubes. Two different strategies using annealing and wet procedure are proposed to trigger the release of the filler.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
A. I. Shames, A. M. Panich, L. Friedlander, V. Yu. Dolmatov
Summary: This paper reports on the synthesis of novel detonation nanodiamonds (DNDs) from non-conventional explosives and investigates the variations in their structure and properties. The study shows that DNDs synthesized from different explosive precursors have different ratios of carbon atoms in their core and shell, which affect their paramagnetic defects and nuclear magnetic resonance phenomena. These findings provide new opportunities for precise control of the synthesis and properties of DNDs.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Georgios G. Pyrialakos, Julius Beck, Matthias Heinrich, Lukas J. Maczewsky, Nikolaos Kantartzis, Mercedeh Khajavikhan, Alexander Szameit, Demetrios N. Christodoulides
Summary: In this study, the authors present a photonic realization of Floquet topological insulators that reveal topological phases supporting both Chern and anomalous topological states. They introduce a class of bimorphic Floquet topological insulators that utilize connective chains with periodically modulated on-site potentials to reveal rich topological features in the system. Experimental results using photonic waveguide lattices show a strongly confined helical edge state that can be set into motion or halted without compromising its adherence to individual lattice sites.
Article
Mechanics
Filiberto Ares, Jose G. Esteve, Fernando Falceto
Summary: In this paper, the localized states of a generic quadratic fermionic chain with finite-range couplings and an inhomogeneity in the hopping are studied. The authors investigate the behavior of zero-energy modes in the presence of a defect and their connection to the topological phases of the system. They propose an index to characterize the different phases and analyze the robustness of the connections between the bands. The pumping of states between bands is shown to create particle-hole pairs in the bulk.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Optics
Matteo Secli, Tomoki Ozawa, Massimo Capone, Iacopo Carusotto
Summary: In this study, a semiclassical theory of laser oscillation in a chiral edge state of a topological photonic system with frequency-dependent gain is developed. By considering a Harper-Hofstadter lattice embedding two-level atoms as a gain material, the researchers demonstrate a flexible mode-selection mechanism that can stabilize single-mode lasing into an edge state. The implications of these results for recent experiments are outlined.
Article
Chemistry, Physical
Hee Jae Hwang, Hyunmin Hong, Bong Geun Cho, Hyeon Kyu Lee, Jae Sung Kim, Un Joo Lee, Wook Kim, Hakjeong Kim, Kwun-Bum Chung, Dukhyun Choi
Summary: The study describes a triboelectric nanogenerator with enhanced surface charge density by introducing oxygen vacancies in the ETL, improving its performance. Investigation of band diagram and optimal ETL characteristics resulted in high-performance output. Application of the E-TENG in a kinematic system significantly increased working frequency, enabling the operation of wireless sensors.
Article
Chemistry, Physical
Yongjie Xu, Shuilin Li, Weili Zhang, Yuan Liu, Jiawei Liu, Maoyun Di, Yong Wang, Youwei Du, Nujiang Tang
Summary: Fluorination can significantly alter the physical and chemical properties of carbon materials. The concentration of edge C-F groups in multidimensional carbon materials depends on the crystallinity of the starting materials, fluorination pressure, and temperature, leading to significant differences in properties between different fluorinated structures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Xing-Xiang Wang, Zhiwei Guo, Juan Song, Haitao Jiang, Hong Chen, Xiao Hu
Summary: We revealed the unique electromagnetic transport properties of a topological photonic crystal, which is originated from the Dirac frequency dispersion and multicomponent spinor eigenmodes. By precisely measuring the local Poynting vectors in microstrips of honeycomb structure, we showed that a chiral wavelet induces a global electromagnetic transportation circulating in the direction counter to the source, which is intimately related to the topological band gap specified by a negative Dirac mass. This brand-new Huygens-Fresnel phenomenon can be considered as the counterpart of negative refraction of electromagnetic plane waves associated with upwardly convex dispersions of photonic crystals, and our present finding is expected to open a new window for photonic innovations.
NATURE COMMUNICATIONS
(2023)
Article
Polymer Science
Raquel Ledezma-Rodriguez, Ernesto Hernandez Hernandez, Roberto Yanez-Macias, Zureima Garcia Hernandez, Gabriela Yolotzin Romero Zuniga, Maria Guadalupe Garcia Falcon, Carlos Gallardo-Vega, Pablo Gonzalez Morones
Summary: The study focuses on the microwave dielectric heating of graphite oxide during the synthesis of Nylon-6/GrO hybrid polymeric nanocomposites using different microwave input powers and two GrO morphologies. Results indicate that the morphology of GrO plays a determining role in its dielectric heating behavior, affecting the exfoliation and hybridization processes in the synthesis of HPNCs.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
A. M. Panich, A. E. Aleksenskii, E. B. Yudina, A. Ya Vul
Summary: We report a novel approach to determine the spatially resolved nuclear spin-lattice relaxation times and NMR line widths in nanomaterials. We applied this approach to detonation nanodiamonds with manganese ions grafted onto their surface and observed the acceleration of nuclear spin-lattice relaxation and broadening of the resonance line. By using spin dephasing experiments, we were able to determine the contribution of paramagnetic Mn2+ ions to the relaxation time and line width of carbon spins at different depths from the diamond surface. Developed specifically for nanodiamonds, this approach can be applied to study distribution of relaxation rates and line broadening, and map magnetic interactions inside various nanoparticles, making it valuable in nanotechnologies.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Jiahui Xu, Qingjing Liang, Zijian Li, Vladimir Yu Osipov, Yangjian Lin, Binghui Ge, Qian Xu, Junfa Zhu, Hong Bi
Summary: In this study, a new strategy was developed to synthesize carbon dots with solid-state UVB emission. The obtained UVB emissive carbon dots exhibited high quantum yield and environmental robustness, making them highly desirable for applications in plant lighting.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Mingsheng Xu, Chen Dong, Jiahui Xu, Sajid Ur Rehman, Qiyang Wang, Vladimir Yu Osipov, Kai Jiang, Junfeng Wang, Hong Bi
Summary: Carbon dots (CDs) have excellent optical properties, and in this study, a polymer nanocomposite containing fluorinated carbon dots (FCDs) was synthesized, showing temperature-sensitive optical properties that can be applied in anticounterfeiting, information encryption, and thermo-sensitive sensors.
Article
Materials Science, Paper & Wood
Ken-ichi Niihara, Toru Noguchi, Takahiko Makise, Wataru Kashima, Morinobu Endo, Akira Isogai
Summary: An aqueous dispersion of TEMPO-CNFs was used to prepare TEMPO-CNF/MA-PP/PP composite sheets, which showed increased yield stress and storage modulus with increasing TEMPO-CNF content but decreased elongation at break. The presence of TEMPO-CNFs restricted the flow behavior of the MA-PP/PP components but did not affect the crystallinities and melting behavior of the composite sheets. Aggregation behavior of TEMPO-CNFs in the PP matrix may have resulted in brittle tensile properties of the composite sheets.
Article
Chemistry, Inorganic & Nuclear
Fedor M. Shakhov, Vladimir Yu Osipov, Andrei A. Krasilin, Kanji Iizuka, Ryuji Oshima
Summary: This study synthesized two samples of microcrystalline diamond powders under high pressure and temperature conditions, calculated the nitrogen content in diamond crystals using different methods, and found that some commonly used equations may give overestimated values; Additionally, the addition of aluminum powder can reduce spontaneous nucleation, leading to a change in crystal size distribution.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Ilya D. Gridnev, Vladimir Yu. Osipov
Summary: This survey discusses recent achievements in the creation of a new type of material - nanodiamonds grafted with atoms of transition metals. It explores the structural features, scope, limitations, and potential applications of selected chelate complexes using density functional theory. Furthermore, the study investigates the location of copper ions relative to subsurface defects of detonation diamonds through the method of electron paramagnetic resonance (EPR).
MENDELEEV COMMUNICATIONS
(2022)
Article
Materials Science, Composites
Hiroshi Jinnai, Toru Noguchi, Akemi Kumagai, Morinobu Endo, Akira Isogai
Summary: Suitable mixing of nanocellulose can improve the tensile properties of rubber composite sheets. Transmission electron microscopy observations showed that the composite sheets were composed of rubber/nanocellulose clusters, with voids forming inside the clusters and propagating to form cracks, which then fused with other voids or cracks.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Multidisciplinary
Vladimir Yu Osipov, Fedor M. Shakhov, Nikolai M. Romanov, Kazuyuki Takai
Summary: Nitrogen and nickel are the main impurities in type Ib synthetic diamonds obtained under high pressure and high temperature conditions. The study found that an aluminum getter can prevent nitrogen from penetrating the diamond lattice.
MENDELEEV COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Elena B. Yudina, Alexander E. Aleksenskii, Sergey A. Bogdanov, Sergey S. Bukalov, Larisa A. Leites, Dmitry B. Radishev, Anatoly L. Vikharev, Alexander Y. Vul'
Summary: This paper presents experimental results on the formation of Eu ions' luminescent centers in CVD diamond films. A new approach using diamond nanoparticles surface modified with Eu ions for seeding during CVD growth has been implemented. The growth of Eu-doped nanocrystalline diamond films (NCD) on silicon substrates through microwave plasma-assisted CVD at 2.45 GHz resulted in distinct photoluminescence spectra, confirming the incorporation of Eu ions into the NCD film.
Article
Nanoscience & Nanotechnology
A. I. Shames, G. G. Zegrya, D. M. Samosvat, V. Yu Osipov, A. Ya Vul
Summary: The experiments showed that the EPR spectra undergo qualitative changes as the size of diamond particles decreases. This is due to the indirect exchange interaction between localized electrons on bulk impurity centers and electrons on surface centers, resulting in resonant energy transfer and affecting the characteristic structure of the EPR spectra.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Vasily T. Lebedev, Fedor M. Shakhov, Alexandr Ya. Vul, Arcady A. Zakharov, Vladimir G. Zinoviev, Vera A. Orlova, Eduard V. Fomin
Summary: Powder diamonds with integrated europium atoms were synthesized at high pressure and temperature. The concentration of Eu atoms in these diamonds was found to be two orders of magnitude higher than in natural and synthetic diamonds. The formation of high-quality diamond monocrystals containing Eu and a substantial amount of nitrogen was confirmed through various techniques.
Article
Crystallography
Danil W. Boukhvalov, Vladimir Yu. Osipov
Summary: This work presents the results of various scenarios in the initial stages of assembling carbon quantum dots (CQDs) from citric acid (CA) or o-phenylenediamine (OPD). Step-by-step simulations reveal that the assembly process of CQDs differs from previously proposed models. For instance, synthesizing CQDs from citric acid leads to the appearance of carbonyl (C=O) and carboxyl (-COOH) groups during the addition of carbon rings. On the other hand, manufacturing CQDs from OPD results in energetically favorable flat nanographenes, but also involves oxidation and the formation of C-OH bonds. Possible mechanisms for eliminating excessive carboxyl or hydroxyl groups are suggested.
Article
Nanoscience & Nanotechnology
Danil W. Boukhvalov, Vladimir Yu. Osipov, Benjamin Thomas Hogan, Anna Baldycheva
Summary: We propose new models to accurately determine the optical properties of nitrogen-free carbon quantum dots (CQDs) with ordered graphene layered structures. These models are validated against experimental results for CQDs from literature review, and can be applied to CQDs with varied sizes and oxygen contents. The blue fluorescent emission of nitrogen-free CQDs is found to be associated with oxidised areas on the periphery of the graphene sheet or non-functionalised islands of carbon in the centres of oxidised graphene sheets. Additionally, larger and/or less symmetric non-functionalised regions contribute to green and red fluorescent emission. The models also show that the bandgaps and photoluminescence of CQDs are not affected by out-of-plane corrugation or spacing between islands.
Article
Chemistry, Multidisciplinary
Vladimir Yu Osipov, Nikolai M. Romanov, Inna E. Suvorkova, Ekaterina Osipova, Takuma Tsuji, Yasushi Ishiguro, Kazuyuki Takai
Summary: In this study, it was found that the surface of nanodiamonds can be modified to form copper chelate complexes by copper ions. The concentration of these complexes can be monitored using electron paramagnetic resonance method through the signal width and shape.
MENDELEEV COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Shuanghui Zeng, Xue Wang, Yunqian Zhang, Jiaojing Shao, Zhao Ding, Jie Zhao
Summary: A free-standing 3D core/shell composite material CNTs@Co9S8 on nickel mesh has been prepared using a simple two-step method. The composite material exhibits excellent conductivity and charge storage capability, making it a promising candidate for supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Marieta Belcheva, Georgi Georgiev, Boyko Tsyntsarski, Urszula Szeluga, Lyudmila Kabaivanova
Summary: This study successfully prepared new antibacterial materials by combining activated carbon with metal nanoparticles, taking advantage of the well-known antibacterial activity of metal nanoparticles. The obtained composites exhibited strong antibacterial effects against E. coli and S. aureus, with the antibacterial activity depending on the contact time, bacterial species, nature of the metal, and metal concentration. The findings provide novel materials with antibacterial properties for further development and potential application in hygiene devices.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. P. Madhurima, Kusum Kumari, P. K. Jain
Summary: In this study, carbon nanomaterials were synthesized using the arc discharge technique, with a focus on optimizing process parameters to improve yield and quality. The materials were characterized using various analytical tools, and their dye adsorption capabilities were evaluated. The results showed that carbon soot had better adsorption performance compared to carbon nanotubes, indicating the potential of these carbon nanomaterials for environmental remediation applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaolong Sun, Bo Cui, Pingping Liang, Qimeng Liu, Nan Gao, Hongdong Li
Summary: This study explores the potential of hafnium (Hf) terminated diamond surfaces in achieving negative electron affinity (NEA). By using swarm-intelligence structural search and first-principles calculations, the researchers found that Hf-terminated diamond surfaces exhibit stable NEA properties and high thermal stability, making them promising candidate materials for electron emission applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
N. Soltani, N. Tavakkoli, E. Eslami, L. S. Mirmohammadi
Summary: In this project, a carbon paste electrode modified with graphene and ZnFe2O4 spinel nanoparticles (Gr/ZnFe2O4/CPE) was used to measure naproxen, and various electrochemical methods were used to investigate its behavior. By optimizing the parameters, good measurement results were obtained.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xiwei Cui, Yue Qin, Xin Han, Huanyi Chen, Xinxin Ruan, Hui Zhang, Chengcheng Jiao, Rongqi Mao, Jinglin Hao, Sizhuang Zhao, Shuai Hou, Xiaoxuan Pian, Yandong Wang, Kazuhito Nishimura, Lifen Deng, Nan Jiang
Summary: This paper investigates the friction and wear behaviors of two types of polycrystalline diamonds against different materials. The results show that increasing surface roughness leads to an increase in coefficient of friction. The coefficient of friction and wear rate of ceramic Si3N4 balls are generally lower than those of steel GCr15 balls, except for one type of polycrystalline diamond. Transfer films of SiO2 and its hydrate are observed at the friction interface, which contribute to smoother friction and wear. Carbon-based transfer films are also identified, mainly catalyzed by residual cobalt in the polycrystalline diamonds, leading to a phase transformation.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Menglei Sun, Pengjun Li, Mao Wang, Yidan Liang, Xudong Yang, Shujie Pang
Summary: In this study, carbonized polymer dots were synthesized by a one-step hydrothermal method, and silver nanoclusters were synthesized by UV lamp irradiation. They were then self-assembled by electrostatic force to prepare a dual-emission fluorescent nanocomposite that responds to temperature changes. The nanocomposite showed two emission peaks and exhibited excellent linearity between 20°C and 80°C.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Mohamed J. Saadh, Durgesh Singh, Diego Mayorga, Anjan Kumar, Maria Albuja, Ahmad Ismael Saber, Mohammed Ahmed Mustafa, Yasser Elmasry, Noubu Sun
Summary: Based on density functional theory, it is found that the C3N monolayer has good adsorption capability for Hg0 and a short recovery time. This study suggests that the C3N monolayer is a promising adsorbent material for efficient control of gaseous mercury.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Rajendra Kumar Nare, Sivalingam Ramesh, Vijay Kakani, Yuvaraj Haldorai, Chandrasekaran Karthikeyan, Basivi Praveen Kumar, Nadavala Siva Kumar, Mohammad Asif, S. Naresh Kumar, D. Prakash Babu, K. Ramakrishna Reddy, Visweswara Rao Pasupuleti
Summary: This study examines the latest advancements in carbon nanotube (CNT) supercapacitors and related composites, aiming to identify strategies for enhancing their performance. The researchers used ultrasonication aided hydrothermal technique to synthesize a composite made of nitrogen doped carbon nanotubes and porous NiCo2O4 nanomaterial. The composite electrode exhibited excellent cycling stability and a rising specific capacitance, making it appealing for high-performance supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
D. Mary Deena, S. Arockia Anushya, A. Dhanusha, T. C. Sabari Girisun, A. Philominal
Summary: A single-beam Z-Scan experiment was conducted to investigate the nonlinear optical absorption and optical limiting properties of Bi2O3, rGO/Bi2O3, Bi2O3/WO3, and rGO/Bi2O3/WO3 nanostructures. The results showed that the synthesized nanostructures exhibited varying levels of nonlinear absorption, with bismuth-based nanostructures showing the lowest optical limiting threshold and a higher two-photon absorption coefficient. The presence of rGO contributed to the extended conjugation for charge transfer, while the strong UV-Visible absorption of Bi2O3 and WO3 led to a unique nonlinear optical response.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Weibing Guo, Yiren Hu, Tao Wang, Xiaoguang Chen
Summary: This study investigated the microstructure and forming mechanism of graphite/copper joints that were brazed using Ti-containing filler. The results showed that increasing the brazing temperature improved the heat transfer and tensile properties of the composites. Additionally, the composites exhibited high heat flux and faster heating rate compared to copper and aluminum.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ming Li, ZhiWen Wang, Yu Teng, Hongyu Zhao, Bowei Li, Yang Liu, Shengxue Wang, Zhenze Yang, Liangchao Chen, Hongan Ma, Xiaopeng Jia
Summary: In the experiment, different Ni-content catalysts were used to synthesize diamond crystals, and the properties of the synthesized diamonds were analyzed. The results revealed that the Ni content in the catalyst affects the crystallinity of diamond crystals and the nitrogen crystallinity. The photoluminescence spectroscopy also showed that the diamond synthesized by using Fe-containing catalyst has specific NV-color center structure.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ling-Feng Mao
Summary: This study proposes an LSTM model to predict the work function of adsorbed metal atoms on graphene, which can quickly screen surface structures with target work function, saving computing and time costs, and improving device performance.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Runzhou Xu, Yinshui Liu, Qian Cheng, Zhenyao Wang, Kai Ma, Peiling Ke, Yipan Deng
Summary: The wear resistance of 17-4PH stainless steel was significantly improved by depositing multi-layered Cr/CrC/DLC coating at wide temperature range. The coating exhibited excellent lubrication and protective properties, and the wear mechanism changed with increasing temperature. The tribochemical reaction during the wear process played a crucial role in the graphitization transformation and friction properties of the coating.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xilong Guo, Jiaxin Song, Shanling Wang, Li Lei, Omololu Odunmbaku, Ayoub Taallah, Yi He, Aiqun Gu, Filippo S. Boi
Summary: The recent observations of superconductive-ordering in carbon-based systems consisting of rhombohedral stacking-faults, trilayer graphene (ABC-stacks) or dislocation-rich interfaces (pyrolytic graphite) have attracted significant attention. In this study, an unusual nucleation of rhombohedral stacking-faults in low-dimensional systems comprising of multiwall carbon nanotube (CNT) buckypapers was reported. The presence of sulfur doping resulted in a broad-band at the Raman shift from 1800 to 2000 cm(-1), indicating contributions arising from disorder-rich regions with rhombohedral stacking-order (ABC-stacks). These observations were further supported by X-ray diffraction and Rietveld refinements.
DIAMOND AND RELATED MATERIALS
(2024)
