Article
Engineering, Mechanical
Tianye Jin, Zihao Lin, Bing Liu, Jin Zheng, Junyun Chen, Anmin Nie
Summary: The novel graphite/diamond composite material (Gradia) possesses ultrahardness, toughness, and semiconductive properties. However, the difference in mechanical properties between its diamond and graphite components makes surface finishing challenging. This study investigated the material removal characteristics of Gradia through experiments and molecular dynamic simulations. The results showed that the main mechanism of phase transformation during mechanical polishing was amorphization, as the graphite and diamond phases of Gradia interconverted under mechanical action. This study also demonstrated the creation of a Gradia tool with a lower wear rate and an unusual self-lubricating characteristic due to the abrasion-induced generation of graphite.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Arpan Kundu, Yunxiang Song, Giulia Galli
Summary: We carried out quantum simulations to study the physical properties of diamond-like amorphous carbon and found that quantum vibronic coupling is crucial for determining the electronic properties and has a moderate influence on the structural properties. Our calculations also highlight the notable influence of nuclear quantum effects on the electrical conduction mechanisms in this material.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Longxing Liao, Zhenyu Zhang, Fanning Meng, Dongdong Liu, Bin Wu, Yubiao Li, Wenxiang Xie
Summary: This study investigated the influence of CMP slurries with different pH values and oxidants on the quality of polished SCD surface, and found that the optimal slurry achieved the lowest surface roughness. The CMP mechanism was elucidated by XPS and IR spectroscopy, showing that hydroxyl radicals and hydrogen ions played a crucial role in achieving an ultra-smooth SCD surface.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Huipeng Yang, Zhuji Jin, Hao Niu, Yu Shen, Xiaoyu Zhang, Mengcan Ao
Summary: The effect of different chemical mechanical polishing (CMP) slurries on the surface roughness and material removal rate of single crystal diamond was investigated in this study. The optimum slurry composition was determined, and high efficiency in obtaining high quality single crystal diamond surface was achieved. The mechanism of the optimum slurry CMP was elucidated, and an ultra-smooth surface was obtained through the removal of oxidized carbon atoms using diamond micro-powder abrasive.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Manufacturing
Hailang Wen, Jing Lu, Shuai Xu, Ning Yan
Summary: A method utilizing mechanical action to induce chemical reaction for SCD polishing was proposed in this study. A novel semi-fixed abrasive polishing tool suitable for high-speed polishing was fabricated using the sol-gel technique. Experiments confirmed that the synergistic effects of mechanical action and chemical reaction could increase material removal rate and produce a smoother surface with less damage to the subsurface of the SCD.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Mechanical
Song Yuan, Xiaoguang Guo, Ming Li, Zhuji Jin, Dongming Guo
Summary: Oxidants play a crucial role in the final surface quality and removal rate during CMP. This study presents a new polishing slurry based on Fenton reaction, achieving high quality and efficiency removal of diamond.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Huipeng Yang, Zhuji Jin, Lin Niu, Hongchao Wang, Hao Niu
Summary: The study shows that the visible-light-Fenton reaction solution synthesized with ND/LDH catalyst achieves high efficiency and quality in single crystal diamond CMP, with high material removal rate and low surface roughness.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Ceramics
Jihua Peng, Jiacheng Liao, Manzhong Yang, Jingwen Liao, Jun Bi
Summary: The study deposited pure a-C:H and a-C:N:H coatings with different nitrogen concentrations on various substrates using PECVD technology, and found that nitrogen doping can increase the wear rate of the coating, while the presence of OH groups can increase the coefficient of friction.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Nan Xu, Chun Wang, Liuquan Yang, Gin Jose, Ardian Morina
Summary: Solid-liquid lubricating systems have shown promise for energy saving but require a deep understanding of the interaction mechanisms between solid and liquid lubricants. This study developed a highly sensitive Raman-based method to detect MoDTC-derived tribofilms, revealing key information on their effect on a-C:H wear over time and proposing a two-stage wear progression mechanism.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Kentaro Kawaguchi, Yang Wang, Jingxiang Xu, Yusuke Ootani, Yuji Higuchi, Nobuki Ozawa, Momoji Kubo
Summary: The study investigates the OH-radical-assisted CMP process of GaN, revealing that it occurs through three basic reaction steps: replacing hydrogen terminations on the GaN surface with OH terminations, removing hydrogen atoms from these OH terminations, and intruding oxygen atoms inside the substrate to remove N and Ga atoms.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Ceramics
Haiyong Wu
Summary: This study systematically investigates the wear characteristics of single SCD grit scratching on sapphire with different contact forms, and finds that the SCD grit with face contact form is the most wear-resistant, while the SCD grit with point contact form is the most prone to cleavage and fracture. Contact form is closely related to the stress state, and has a crucial influence on the wear characteristics of SCD grit during scratching on sapphire.
CERAMICS INTERNATIONAL
(2021)
Article
Optics
Lingyu Zhao, Huiying Zhao, Hairong Wang, Mingjie Zhang, Ruiqing Xie, Mingzhuang Zhang
Summary: In this study, a real-time dresser and planar polishing process based on real-time dressing were developed for large-aperture optical plane components. The real-time dresser enables efficient dressing of the polishing pad surface and real-time correction of the surface shape, improving the flatness of the optical element surface.
Article
Engineering, Mechanical
Qixiang Zhang, Jisheng Pan, Xiaowei Zhang, Jiabin Lu, Qiusheng Yan
Summary: This study evaluated the effect of different polishing slurries on single crystal 6H-SiC friction and wear, showing that the SiC surface only had scratches when silica sol abrasive was present, and a loose and porous chemical reaction layer formed when oxidant was present.
Article
Materials Science, Multidisciplinary
Depeng Sun, Heng Zhang, Yu Cai, Tongyan Sun, Jinsheng Zhang
Summary: This study aims to understand the wear of diamond grains (DGs) in granite processing by considering crystal plane characteristics. It explains the fracture morphology of DGs, discusses the wear behavior and morphologic characterization of DGs, and proposes the wear evolution mechanism of diamond segment (DS) topography.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Nian Liu, Kentaro Sugimoto, Naoya Yoshitaka, Hideaki Yamada, Rongyan Sun, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: This study systematically investigates the effects of polishing pressure and sliding speed in plasma-assisted polishing (PAP) on single crystal diamond (SCD) substrates. The results show that low polishing pressures lead to a smooth atomic-scale surface, while high pressures result in a rough surface with grooves. Furthermore, the sliding speed has minimal effect on the surface quality parameter.
DIAMOND AND RELATED MATERIALS
(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)