npj 2D Materials and Applications
·
2021
·Vol. 5
·期 1
·1-12
·
IF 11.106
Ren Xiaoyong,Yang Xiao,Xie Guoxin,He Feng,Wang Rong,Zhang Chenhui,Guo Dan,Luo Jianbin
Superlubricity has recently raised an increasing interest owing to its great potential in energy saving and environmental benefits. Yet how to obtain stable superlubricity under an ultrahigh contact pressure (>1 GPa) still remains a challenge. Here, we demonstrate that robust liquid superlubricity can be realized even under a contact pressure of 1193 MPa by lubrication with partially oxidized black phosphorus (oBP) nanosheets. The analysis indicates that the oBP nanosheets that absorb large amounts of water molecules are retained at the friction interface and transform the friction pairs interface to that between the oBP nanosheets. Molecular dynamics simulation demonstrates that water molecules could be retained at the friction interface even under the ultrahigh contact pressure owing to the abundant P=O and P–OH bonds formed on the oBP nanosheet surfaces, contributing to the achievement of stable superlubricity under the ultrahigh contact pressure. This work has the potential of introducing the liquid superlubricity concept in diverse industrial applications involving high-contact-pressure operating conditions.
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Fei-Fei Wang,Zan Liu,Zhi-Lin Cheng
In this study, the zeolitic imidazolate frameworks-8 (ZIF-8) with nano- and micro-sized morphologies was successfully fabricated by solvothermal method. The dispersibility of as-obtained ZIF-8 in oil was studied. As an application, the tribological behavior of the as-obtained ZIF-8 in the based oil was investigated. The nano- and micro-sized morphologies of as-obtained ZIF-8 were conductive to reduce the friction coefficient and wear, and raise the carrying capacity in the base oil. In addition, the friction reducing mechanism was proposed.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Zhuo Chen,Guoqiang Liu,Yuxin Zou,Kang Du,Feng Zhou,Weimin Liu
Titanium alloy, especially Ti6Al4V, has gained widespread recognition as a material for joint implant. Aiming at the problems such as high friction and easy infection of Ti6Al4V implant materials in practical applications, a strategy of surface modification of Ti6Al4V was proposed. Inspired by the articular cartilage, a tough hydrogel integrated with lubricating and antibacterial properties was prepared in this work, and tightly applied to the Ti6Al4V surface with an adhesive agent. The strength of the hydrogel coating was similar to that of human articular cartilage, and play remarkable lubricating and antibacterial effects at the same time. This work presented new perspectives on the application of hydrogel coatings in biomedicine, underwater equipment, smart manipulation, and other fields.
研究领域:
生物医学工程
·
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Qilong Zhou,Lisong Dong,Jian Wu,Yijun Shi,Xin Feng,Xiaohua Lu,Jiahua Zhu,Liwen Mu
From one to more, the same raw materials giving rise to multifarious products is one of the goals of researchers to pursue industrial efficiency. Herein, we designed a formula (controlling the content of the matrix) to prepare two functional ionic gels, integrating the excellent lubrication, thermal conductivity, and self-healing ability to meet different industrial demands of the lubrication and biomedical fields. Deep eutectic solvents (DESs) of urea/choline chloride (UCC) and glycerol/choline chloride (GCC) were locked in polyacrylamide (PAM) ionic gel formed by acrylamide (AM) and a photoinitiator by free-radical polymerization. The unique dual hydrogen bond network in the ionic gel causes the material to exhibit a low wear rate, which can effectively reduce the wear of metal contact. With the addition of PAM, the ionic gel has excellent mechanical strength and good recovery performance. Unexpectedly, this dense hydrogen bond network enhances thermal conductivity by optimizing phonon and electron transfer. The versatile ionic gel has a good application prospect as a substitute for industrial lubricants and medical device materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Biosurface and Biotribology
·
2020
·Vol. 6
·期 3
·82-86
·
IF 0
Yixin Wang,Li Wan,Yulong Sun,Hongyu Zhang
The superlubrication property of articular cartilage is attributed to the hydration lubrication mechanism. This involves the complexation of biomacromolecules with phosphatidylcholine lipids to form a lubricating boundary layer on the surface. Based on this mechanism, a branched polyelectrolyte polymer – PEI-PMPC was synthesised in this study to enhance lubrication via tert-butyl hydroperoxide-initiated grafting polymerisation of 2-methacryloyloxyethyl phosphorylcholine (MPC) onto polyethyleneimine (PEI) with various molecular weights. Following the characterisation of the polymer using nuclear magnetic resonance, a series of tribological tests were performed under different normal loads and different scan rates. The results showed that the PEI-PMPC polyelectrolyte polymer in aqueous solution could effectively reduce the friction coefficient and wear generation between the polyethylene ball and the silica wafer. Additionally, an improvement in the lubrication performance was detected for the PEI-PMPC polyelectrolyte polymer when high molecular weight PEI was used during the reaction, which was attributed to the formation of the hydration shells surrounding the zwitterionic charges of PMPC and the viscosity of the polymer. In conclusion, the PEI-PMPC polyelectrolyte polymer developed herein was characterised by enhanced lubrication, and may be potentially used for biomedical applications such as intra-articular injection to restore joint lubrication.
研究领域:
生物材料学
·
摩擦学
·
高分子化学
✓ 已验证
DOI
Cell Reports Physical Science
·
2023
·
IF 8.9
Jianfeng Li,Yao Cheng,Wei Song,Kaiqiang Wang,Ming Ma,Jinjin Li
Graphite and molybdenum disulfide (MoS 2 ) have been widely utilized as oil lubricating additives exhibiting superior friction-reducing capability, but there is debate about which one possesses better lubrication performance in the oil environment. Here, we report the nanotribological properties of graphite and MoS 2 homojunctions in the oil environment of hexadecane examined by atomic force microscope (AFM) and molecular dynamic (MD) simulations. The friction coefficient of the MoS 2 homojunction is 0.003, while the graphite homojunction processes a much better lubrication performance with a lower friction coefficient of 0.001 (67% reduction). There is a confined molecular layer of hexadecane in the contact zone, and the shear occurs at the graphite/hexadecane and MoS 2 /hexadecane interfaces for graphite and MoS 2 homojunctions, respectively. MD simulation demonstrates that the hexadecane molecules are directionally aligned along the zigzag direction of graphite for the corrugated and anisotropic potential energy surface, and this orderly arrangement contributes to the lower energy barrier.
研究领域:
材料科学
·
表面物理化学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Shouzheng Jiao,Yufen Li,Yang Zhang,Dongjie Zhang,Yuyan Liu,Zhongjun Cheng
Liquid-like PDMS brushes coating with low adhesion to droplets are significant in both fundamental research and practical application. Covalent grafting is a common strategy to prepare PDMS brushes with low adhesion to diverse liquids in a wide range of surface tensions, but it is only suitable for high active inorganic substrates. Casting of mixtures containing PDMS can solve this problem; however, homogeneity and low adhesion cannot be guaranteed. Here we report a simple method by step-by-step spraying for preparing PDMS brushes, which is suitable for both substrates. Droplets with a wide range of surface tension can slide off the coating with a sliding angle less than 10°. Research results indicate that the polyamine with flexible molecular chain and high functionality is beneficial for brushes coating with high grafting density and excellent surface lubricity. Finally, good stability and diverse applications in fouling resistance, self-cleaning, anti-bursting, etc. are also demonstrated.
研究领域:
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hongling Fang,Yi Li,Songwei Zhang,Qi Ding,Litian Hu,Kuan Lu
Hypothesis Ionic liquids (ILs), as lubricant additives , can greatly improve the lubricating behavior of the frictional interfaces. However, it is urgent to explore ILs with good oil solubility in nonpolar oils, and it is necessary to further study and verify the lubrication mechanism of ILs from the perspective of alkyl chain length. Experiments Five protic ILs (PILs) with varying alkyl chain lengths were synthesized by proton transfer method. As additives in PAO oil, their tribological properties were investigated on SRV-V tester. Through molecular dynamics simulation , the adsorption behavior of PILs at the frictional interface was illustrated. Findings The tribological properties of base oil could be significantly improved by adding PIL additives, but interestingly, PILs with short-chain anions showed better lubricating performance, which contradicted most of the early findings. Further analyses revealed that PILs achieved effective lubrication by the tribochemical interaction between anions and frictional interface, and the formation of cationic protective layer. However, PILs with shorter-chain anions form a denser protective layer that can better support the interfacial anions to participate in tribochemical reactions and thus abnormally exhibit superior lubricating performance than those with longer-chain anions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Lubrication Science
·
2022
·Vol. 34
·期 6
·428-439
·
IF 1.307
Feiming Wang,Xing Gao,Shuliang Zang,Guichun Deng,Shuang Yue
Two borate ionic liquids 1-Butyl-3-(2-methoxy-2-oxoethyl)-imidazole bis(mandelato)-borate [MABIM][BMB]) and 1,3-Dioctylbenzotriazole bis(mandelato)-borate ([DOBI][BMB]) were synthesised and utilised as the lubricating additives. Their corrosion degrees were measured and the results show that [DOBI][BMB] and [MABIM][BMB] exhibit remarkable anti-corrosion properties ([DOBI][BMB]: 1a, [MABIM][BMB]: 1b). The 4-ball machine was employed to evaluate their tribological properties in 500 N base oil. When [DOBI][BMB] and [MABIM][BMB] were added at the concentration of 3.0 wt%, the friction coefficient of 500 N was reduced by 37.5% and 29.5%. It can be concluded from the results of XPS and SEM that a lubricating film containing iron oxide, B 2 O 3 and organic N-containing compounds have formed. And a model is proposed so as to describe the lubricating mechanism.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
GIANT
·
2023
·
IF 7
Yaling Wan,JianQing Yu,Zhizhi Zhang,Chenxi Qin,Lunkun Liu,Hao Yang,Meirong Cai,Bo Yu,Xiaowei Pei,Ying Liu,Yanfei Ma,Feng Zhou
Double-layer hydrogel materials combine excellent hydrophilicity, outstanding lubricating properties, high load-bearing modulus, and good biocompatibility, and are often used to achieve high load-bearing (high modulus) and low frictional (low modulus) properties of articular cartilage, but which also makes it difficult for them to form efficient, stable and long-term adhesion underwater. Herein, we constructed a kind of novel underwater Janus hydrogel patches with strong adhesion performance by robustly anchoring mussel-protein-inspired poly (dopamine methacrylamide-co-methoxyethyl acrylate) p(DMA-co-MEA) copolymer onto the surface of poly(acrylic acid-co- acrylamide) p(AAc-co-AAm) hydrogel with bilayer modulus structure analogous to articular cartilage. Due to the coupling of the top lubrication layer and the bottom load-bearing layer, the constructed Janus hydrogel patch not only has fatigue resistance and low friction but also high load-bearing [coefficient of friction (COF) ∼0.0076, 5 N; COF∼0.048, 30 N]. Moreover, the Janus hydrogel also exhibits excellent bonding strength underwater (bonding strength ∼41.6 kPa, Fe substrate). Our strategy for constructing a novel underwater Janus hydrogel patch will provide valuable guidance for the realization of interface bonding of soft material of bionic articular cartilage and promote the practical application of tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2019
·Vol. 28
·期 3
·1668-1677
·
IF 1.476
Yuan Min,Zhao Yu,Niu Wenxing,Shi Qi,Xu Hong,Zheng Bin,Dong Jinxiang
In this study, three different zeolitic imidazolate framework (ZIF) materials of ZIF-8, ZIF-71, and MAF-6 were synthesized, and their tribological properties as base grease were evaluated. We demonstrate that the tribological properties of ZIFs are correlated with the framework density/pore volume and the substituted groups. Under 200 N, MAF-6 has the lowest wear volume value and ZIF-71 exhibits the lowest friction coefficient. As the load increased, MAF-6 maintained the best and most stable tribological performances among the three ZIFs additives; however, the properties of ZIF-71 worsened. Thus, MAF-6 exhibits the lowest density and largest solvent-accessible volume (SAV) and has the lowest elastic stiffness; it easily slides and adheres onto the wear surface, forming a tribofilm that reduces friction and prevents severe wear. ZIF-71 with chlorinated groups may enhance the tribological performance; as the load rises, its dense and stiff structure has an adverse effect. These results are expected to be helpful for designing future ZIFs with excellent lubrication properties.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Zhixiang Li,Kunhong Hu,Yong Xu,Enzhu Hu,Xianguo Hu
A novel method was proposed to improve the dispersion and lubrication of nano-MoS 2 in ester oil. The synthesis of di-n-butyl adipate (DBA) was catalyzed at 145 °C using spherical nano-MoS 2 /sericite (S-MoS 2 /sericite), and the esterification rate reached 95.4%. After the reaction, S-MoS 2 /sericite remained in DBA with a content of ~400 mg/L, and the dispersion system could be stored stably for at least 45 days. Compared with the pure DBA, after standing for 45 days, the dispersion system reduced friction by ~16% and wear by ~72%. At high load and low speed, a tribofilm containing MoS 2 was formed at the ridge of furrow; at low load and high speed, S-MoS 2 /sericite was embedded in the soft surface to lubricate the friction pair .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）