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Savjani N, Mercadillo VO, Hodgeman D, Paterakis G, Deng Y, Vallés C, Anagnostopoulos G, Galiotis C, Bissett MA, Kinloch IA. Tribology of Copper Metal Matrix Composites Reinforced with Fluorinated Graphene Oxide Nanosheets: Implications for Solid Lubricants in Mechanical Switches. ACS APPLIED NANO MATERIALS 2023; 6:8202-8213. [PMID: 37260916 PMCID: PMC10227772 DOI: 10.1021/acsanm.3c00399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 04/20/2023] [Indexed: 06/02/2023]
Abstract
The potential for the use of copper coatings on steel switching mechanisms is abundant owing to the high conductivities and corrosion resistance that they impart on the engineered assemblies. However, applications of these coatings on such moving parts are limited due to their poor tribological properties; tendencies to generate high friction and susceptibility to degradative wear. In this study, we have fabricated a fluorinated graphene oxide-copper metal matrix composite (FGO-CMMC) on an AISI 52100 bearing steel substrate by a simple electrodeposition process in water. The FGO-CMMC coatings exhibited excellent lubrication performance under pin-on-disk (PoD) tribological sliding at 1N load, which reduced CoF by 63 and 69%, compared to the GO-CMMC and pure copper coatings that were also prepared. Furthermore, FGO-CMMC achieved low friction and low wear at higher sliding loads. The lubrication enhancement of the FGO-CMMCs is attributed to the tribochemical reaction of FGO with the AISI 52100 steel counterface initiated by the sliding load. The formation of an asymmetric tribofilm structure on the sliding track is critical; the performance of the FGO/Cu tribofilm formed in the track is boosted by the continued fluorination of the counterface surface during PoD sliding, passivating the tribosystem from adhesion-driven breakdown. The FGO-CMMC and GO-CMMC coatings also provide increased corrosion protection reaching 94.2 and 91.6% compared to the bare steel substrate, allowing for the preservation of the long-term low-friction performance of the coating. Other influences include the improved interlaminar shear strength of the FGO-containing composite. The excellent lubrication performance of the copper matrix composite coatings facilitated by FGO incorporation makes it a promising solid lubricant candidate for use in mechanical engineering applications.
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Affiliation(s)
- Nicky Savjani
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
| | - Vicente Orts Mercadillo
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
| | - Darren Hodgeman
- Carbon
Science Center of Excellence, Morgan Advanced
Materials and Technology, Inc., 310 Innovation Boulevard, Technology
Center, Suite 250, University Park, Pennsylvania 16803, United States
| | - George Paterakis
- Foundation
for Research and Technology Hellas, Institute
for Chemical Engineering Sciences, Stadiou Street, Platani, Patras GR26504, Greece
| | - Yubao Deng
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
| | - Cristina Vallés
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
| | - George Anagnostopoulos
- Foundation
for Research and Technology Hellas, Institute
for Chemical Engineering Sciences, Stadiou Street, Platani, Patras GR26504, Greece
| | - Costas Galiotis
- Foundation
for Research and Technology Hellas, Institute
for Chemical Engineering Sciences, Stadiou Street, Platani, Patras GR26504, Greece
- Department
of Chemical Engineering, University of Patras, Patras 26504, Greece
| | - Mark A. Bissett
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
| | - Ian A. Kinloch
- Department
of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
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2
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Gong P, Li C, Bai X, Qi C, Li J, Wang D, Liu J, Cai M, Liu W. A snowboard-inspired lubricating nanosystem with responsive drug release for osteoarthritis therapy. J Colloid Interface Sci 2023; 646:331-341. [PMID: 37201461 DOI: 10.1016/j.jcis.2023.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/03/2023] [Accepted: 05/04/2023] [Indexed: 05/20/2023]
Abstract
Most of present works of osteoarthritis (OA) therapy are focusing on reducing friction and improving drug loading capacity, while little attention is paid to realizing long-time lubrication and on-demand drug release. In this study, inspired by snowboards with good solid-liquid interface lubrication, a fluorinated graphene based nanosystem with dual functions of long-time lubrication and thermal-responsive drug release was constructed for OA synergetic therapy. An aminated polyethylene glycol bridging strategy was developed to enable covalent grafting of hyaluronic acid on fluorinated graphene. This design not only greatly increased the nanosystem's biocompatibility, but also reduced the coefficient of friction (COF) by 83.3 % compared to H2O. The nanosystem showed long-time and steady aqueous lubrication behavior even after more than 24,000 times of friction tests, and a low COF of 0.13 was obtained with over 90% wear volume reduction. Diclofenac sodium was controllably loaded and sustained drug release was tuned by near-infrared light. Moreover, anti-inflammation results showed that the nanosystem had good protective effect on inhibiting OA deterioration, which could up-regulate cartilage anabolic genes of Col2α and aggrecan while down-regulating catabolic proteases genes of TAC1 and MMP1. This work constructs a novel dual-functional nanosystem that realizes friction and wear reduction with long lubrication life, and shows thermal-responsive on-demand drug release with good synergistic therapeutic effect of OA.
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Affiliation(s)
- Peiwei Gong
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China; State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.
| | - Cheng Li
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China
| | - Xiao Bai
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China
| | - Changmin Qi
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Juan Li
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China
| | - Dandan Wang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China.
| | - Jianxi Liu
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China
| | - Meirong Cai
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Weimin Liu
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
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3
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Kim H, Kim DH, Jeong Y, Lee DS, Son J, An S. Chemical gradients on graphene via direct mechanochemical cleavage of atoms from chemically functionalized graphene surfaces. NANOSCALE ADVANCES 2023; 5:2271-2279. [PMID: 37056614 PMCID: PMC10089115 DOI: 10.1039/d3na00066d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 03/13/2023] [Indexed: 06/19/2023]
Abstract
Manipulating the surface chemistry of graphene is critical to many applications that are achievable by chemical functionalization. Specifically, tailoring the spatial distribution of functional groups offers more opportunities to explore functionality using continuous changes in surface energy. To this end, careful consideration is required to demonstrate the chemical gradient on graphene surfaces, and it is necessary to develop a technique to pattern the spatial distribution of functional groups. Here, we demonstrate the tailoring of a chemical gradient through direct mechanochemical cleavage of atoms from chemically functionalized graphene surfaces via an atomic force microscope. Additionally, we define the surface characteristics of the fabricated sample by using lateral force microscopy revealing the materials' intrinsic properties at the nanoscale. Furthermore, we perform the cleaning process of the obtained lateral force images by using a machine learning method of truncated singular value decomposition. This work provides a useful technique for many applications utilizing continuous changes in the surface energy of graphene.
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Affiliation(s)
- Hyeonsu Kim
- Department of Physics, Institute of Photonics and Information Technology, Jeonbuk National University Jeonju 54896 South Korea
| | - Dong-Hyun Kim
- Functional Composite Materials Research Center, Korea Institute of Science and Technology Jeonbuk 55324 South Korea
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University Suwon 16419 South Korea
| | - Yunjo Jeong
- Functional Composite Materials Research Center, Korea Institute of Science and Technology Jeonbuk 55324 South Korea
| | - Dong-Su Lee
- Functional Composite Materials Research Center, Korea Institute of Science and Technology Jeonbuk 55324 South Korea
| | - Jangyup Son
- Functional Composite Materials Research Center, Korea Institute of Science and Technology Jeonbuk 55324 South Korea
- Division of Nano and Information Technology, KIST School University of Science and Technology (UST) Jeonbuk 55324 South Korea
| | - Sangmin An
- Department of Physics, Institute of Photonics and Information Technology, Jeonbuk National University Jeonju 54896 South Korea
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4
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Li W, Luo T, Zhu C, Zhang B, Cao B. Graphene/h-BN Nanosheet/Nanosphere Composites Constructed by In Situ Laser Irradiation with Synergistically Improved Tribological Performance. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Wei Li
- School of Material Science and Engineering, University of Jinan, Jinan 250022, Shandong, China
| | - Ting Luo
- School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, Shandong, China
| | - Changxu Zhu
- School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, Shandong, China
| | - Bin Zhang
- Analytical and Testing Center, Chongqing University, Chongqing 401331, China
| | - Bingqiang Cao
- School of Material Science and Engineering, University of Jinan, Jinan 250022, Shandong, China
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5
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Electronic structure of partially fluorinated graphene: The impact of adsorption patterns and dynamic stability. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Liu Y, Jiang Y, Sun J, Wang Y, Qian L, Kim SH, Chen L. Inverse Relationship between Thickness and Wear of Fluorinated Graphene: "Thinner Is Better". NANO LETTERS 2022; 22:6018-6025. [PMID: 35695465 DOI: 10.1021/acs.nanolett.2c01043] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Atomically thin two-dimensional (2D) materials are excellent candidates for utilization as a solid lubricant or additive at all length scales from macro-scale mechanical devices to micro/nano-electromechanical systems (MEMS/NEMS). In such applications, wear resistance of ultrathin 2D materials is critical for sustained lubrication performance. Here, we investigated the wear of fluorinated graphene (FG) nanosheets deposited on silicon surfaces using atomic force microscopy (AFM) and discovered that the wear resistance of FG improves as the FG thickness decreases from 4.2 to 0.8 nm (corresponding to seven layers to single layer) and the surface energy of the substrate underneath the FG nanosheets increases. On the basis of density function theory (DFT) calculations, the negative correlation of wear resistance to FG thickness and the positive correlation to substrate surface energy could be explained with the degree of interfacial charge transfer between FG and substrate which affects the strength of FG adhesion to the substrate.
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Affiliation(s)
- Yangqin Liu
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Yilong Jiang
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Junhui Sun
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yang Wang
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Linmao Qian
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Lei Chen
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
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7
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Chen S, Hong H, Shen B. Substrate‐dependent enhancement of the durability of EPD graphene coating as a macroscale solid lubricant. SURF INTERFACE ANAL 2022. [DOI: 10.1002/sia.7123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sulin Chen
- School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China
| | - Hong Hong
- School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China
| | - Bin Shen
- School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China
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8
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Chen X, Fan K, Liu Y, Li Y, Liu X, Feng W, Wang X. Recent Advances in Fluorinated Graphene from Synthesis to Applications: Critical Review on Functional Chemistry and Structure Engineering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2101665. [PMID: 34658081 DOI: 10.1002/adma.202101665] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/27/2021] [Indexed: 05/11/2023]
Abstract
Fluorinated graphene (FG), as an emerging member of the graphene derivatives family, has attracted wide attention on account of its excellent performances and underlying applications. The introduction of a fluorine atom, with the strongest electronegativity (3.98), greatly changes the electron distribution of graphene, resulting in a series of unique variations in optical, electronic, magnetic, interfacial properties and so on. Herein, recent advances in the study of FG from synthesis to applications are introduced, and the relationship between its structure and properties is summarized in detail. Especially, the functional chemistry of FG has been thoroughly analyzed in recent years, which has opened a universal route for the functionalization and even multifunctionalization of FG toward various graphene derivatives, which further broadens its applications. Moreover, from a particular angle, the structure engineering of FG such as the distribution pattern of fluorine atoms and the regulation of interlayer structure when advanced nanotechnology gets involved is summarized. Notably, the elaborated structure engineering of FG is the key factor to optimize the corresponding properties for potential applications, and is also an up-to-date research hotspot and future development direction. Finally, perspectives and prospects for the problems and challenges in the study of FG are put forward.
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Affiliation(s)
- Xinyu Chen
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Kun Fan
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Yang Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Yu Li
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300354, P. R. China
| | - Xiangyang Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Wei Feng
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300354, P. R. China
| | - Xu Wang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu, 610065, P. R. China
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9
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Liu Y, Li J, Li J, Yi S, Ge X, Zhang X, Luo J. Shear-Induced Interfacial Structural Conversion Triggers Macroscale Superlubricity: From Black Phosphorus Nanoflakes to Phosphorus Oxide. ACS APPLIED MATERIALS & INTERFACES 2021; 13:31947-31956. [PMID: 34190525 DOI: 10.1021/acsami.1c04664] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
As a new two-dimensional (2D) material, black phosphorus (BP) exhibits great potential for friction reduction. However, achieving macroscale superlubricity with a BP coating remains a great challenge. In this study, we designed a new lubrication system to achieve superlubricity with a BP coating at the macroscale, involving the formation of a BP coating with deposited BP nanoflakes, followed by water lubrication. Robust superlubricity with a coefficient of friction of 0.001 can be achieved on the BP coating in a pure water environment. The superlubricity mechanism is mainly attributed to the shear-induced interfacial structural conversion of BP to phosphorus oxide, leading to the formation of tribofilms on the friction pairs with extremely low shear strength. This finding provides a new strategy for achieving superlubricity of 2D material coatings at the macroscale, which has important implications for the development of novel superlubrication systems for industrial applications.
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Affiliation(s)
- Yanfei Liu
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Jianfeng Li
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Jinjin Li
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Shuang Yi
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Xiangyu Ge
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xin Zhang
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Jianbin Luo
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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10
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Li P, Wang B, Ji L, Li H, Chen L, Liu X, Zhou H, Chen J. Environmental Molecular Effect on the Macroscale Friction Behaviors of Graphene. Front Chem 2021; 9:679417. [PMID: 34249858 PMCID: PMC8262613 DOI: 10.3389/fchem.2021.679417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/07/2021] [Indexed: 11/13/2022] Open
Abstract
This study investigated the friction behavior of graphene in air and nitrogen atmosphere environments. The microstructural evolution caused by the variation of atmosphere environments and its effect on the friction coefficient of the graphene is explored. It is demonstrated that graphene can exhibit excellent lubricating properties both in air and nitrogen atmosphere environments. In air, a highly ordered layer-by-layer slip structure can be formed at the sliding interface. Oxygen and H2O molecules can make edge dangling bonds and defects passive. Thus the interaction between the nanosheets and the layers of nanosheets is weak and the friction coefficient is low (0.06–0.07). While the friction coefficient increases to 0.14–0.15 in a nitrogen atmosphere due to the interaction of defects generated in the sliding process, the nitrogen molecules with lone pair electrons can only make the nanosheets passive to a certain degree, thus the ordered slip structure is destroyed and friction is higher. This work reveals the influence of environmental molecules on the macroscale tribological performances of graphene and its effect on the microstructure at the sliding interface, which could shed light on the lubricating performance of graphene in environmental atmospheres and help us to understand the tribological behaviors of graphite at the macroscale.
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Affiliation(s)
- Panpan Li
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Bo Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Li Ji
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Hongxuan Li
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Lei Chen
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Xiaohong Liu
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Huidi Zhou
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
| | - Jianmin Chen
- Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
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11
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Abstract
The present review focuses on the numerous routes for the preparation of fluorinated graphene (FG) according to the starting materials. Two strategies are considered: (i) addition of fluorine atoms on graphenes of various nature and quality and (ii) exfoliation of graphite fluoride. Chemical bonding in fluorinated graphene, related properties and a selection of applications for lubrication, energy storage, and gas sensing will then be discussed.
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12
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Leidens LM, Maia da Costa MEH, Figueroa NS, Barbieri RA, Alvarez F, Michels AF, Figueroa CA. On the physicochemical origin of nanoscale friction: the polarizability and electronegativity relationship tailoring nanotribology. Phys Chem Chem Phys 2021; 23:2873-2884. [PMID: 33475105 DOI: 10.1039/d0cp06436j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Friction is a ubiquitous manifestation of nature, and when it is studied at the nanoscale, complex and interesting effects arise from fundamental physical and chemical surface properties. Surprisingly, and probably due to the complexity of nanofriction studies, this aspect has not been completely discussed in prior studies. To fully consider the physicochemical influence in nanoscale friction, amorphous carbon films with different amounts of hydrogen and fluorine were prepared, chemically characterized, and evaluated via lateral force microscopy. Hydrogen and fluorine were selected because although they exhibit different physicochemical properties, both contribute to frictional force reduction. Indeed, to explain the experimental behavior, it is necessary to propose a new damping constant unifying both polarizability (physical) and electronegativity (chemical) properties. The satisfactory agreement between theory and experiments may encourage and enhance deeper discussion and new experiments that take into account the chemical peculiarities of frictional behavior relating to nanoscale elastic regimes.
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Affiliation(s)
- Leonardo M Leidens
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), University of Caxias do Sul (UCS), 95070-560, Caxias do Sul, RS, Brazil.
| | - Marcelo E H Maia da Costa
- Physics Department, Pontifical Catholic University of Rio de Janeiro (PUC-RIO), 22453-900, Rio de Janeiro, RJ, Brazil
| | - Neileth S Figueroa
- Physics Department, Pontifical Catholic University of Rio de Janeiro (PUC-RIO), 22453-900, Rio de Janeiro, RJ, Brazil
| | - Rodrigo A Barbieri
- Central Laboratory of Microscopy (LCMIC), University of Caxias do Sul (UCS), 95070-560, Caxias do Sul, RS, Brazil
| | - Fernando Alvarez
- Institute of Physics "Gleb Wataghin", Campinas State University (UNICAMP), 13083-970, Campinas, SP, Brazil
| | - Alexandre F Michels
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), University of Caxias do Sul (UCS), 95070-560, Caxias do Sul, RS, Brazil.
| | - Carlos A Figueroa
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), University of Caxias do Sul (UCS), 95070-560, Caxias do Sul, RS, Brazil. and Plasmar Tecnologia Ltda, 95030-775, Caxias do Sul, RS, Brazil
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13
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Microwave-assisted synthesis of hydroxyl modified fluorinated graphene with high fluorine content and its high load-bearing capacity as water lubricant additive for ceramic/steel contact. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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14
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Yang X, Zhang Z, Zhang T, Nie M, Li Y. Improved tribological and noise suppression performance of graphene/nitrile butadiene rubber composites via the exfoliation effect of ionic liquid on graphene. J Appl Polym Sci 2020. [DOI: 10.1002/app.49513] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xue Yang
- Institute of Noise and VibrationNaval University of Engineering Wuhan 430033 China
| | - Zheming Zhang
- Institute of Noise and VibrationNaval University of Engineering Wuhan 430033 China
| | - Tongrui Zhang
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu 610065 China
| | - Min Nie
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu 610065 China
| | - Yijun Li
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu 610065 China
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