PLoS One
·
2021
·Vol. 16
·期 6
·e0252203
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IF 3.24
Weiwei Wang,Zhuangzhuang Liu,Qimin Song,Xindi Zhang,Shengkai Jiao,Yao Xu,Quanda Xu,Dezun Sheng
The tribological performance of organic molybdenum in the present of organic friction modifier was investigated in this study. Three types of organic friction modifiers were selected, which are Glycerol monooleate, Pentaerythritol and N , N -Dimethylhexadecylamine. The organic molybdenum are MoDTC, MoDDP and molybdenum amide. Friction coefficient and wear were studied in block-on-ring test rig with steel test specimens. Experimental results indicate the Pentaerythritol shows synergistic effect with MoDTC in wide range temperature, while increased the friction coefficient of molybdenum amide in high temperature. N , N -Dimethylhexadecylamine shows synergistic effect with molybdenum amide, while hindered the friction reduction performance of MoDTC in low temperature. The presence of Glycerol monooleate reduced friction coefficient of MoDTC in low temperature, while increased the friction coefficient of molybdenum amide in most situations. All the tested organic friction modifiers improved the friction reduction performance of MoDDP. Most of the tested organic friction modifiers reduced the wear of organic molybdenum. The PT shows the best anti-wear performance with MoDTC. The tribo-chemical products in test specimens lubricated with different lubricant formulas indicate that the presences of Pentaerythritol promotes the production of MoS 2 in MoDTC. N , N -Dimethylhexadecylamine promotes the production of MoS 2 in molybdenum amide. The side products of MoO 1.6 S 1.6 and Cr/MoS 2 of MoDDP in high temperature lead to high friction coefficient.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Lisha Liu,Longxia Wang,Shifan Sun,Yujuan Zhang,Chunli Zhang,Shengmao Zhang
The designed synthesis of ionic liquid-type organic molybdenum (IOMo) compounds was investigated for their tribological performance as additives in alkylated naphthalene base oil, and their performance was compared with commercial additives. When IOMo is combined with ZDDP as additive, they synergistically enhance its anti-friction properties and further improve its anti-wear performance effectively. By analyzing worn surface, coupled with the adsorption performance of the additive, the "adsorption-reaction-film formation" lubrication mechanism is proposed. IOMo forms strongly adsorbed ultra-thick adsorption film on the friction pair surface through electrostatic adsorption, effectively avoiding the running-in wear stage. During the friction process, frictional chemical reactions facilitate the formation of a complex boundary lubrication film, thereby demonstrating excellent anti-friction and anti-wear capabilities across the entire lubrication range.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2025
·
IF 1.8
Hui Zhao,Huilin Fang,Yuefeng Ma,Zhipeng Li,Tianhui Ren
Purpose This study aims to extend the service life and applicability under ultraviolet (UV) irradiation conditions, the authors reveal the strong UV resistance of dibenzoylmethane molybdenum (MDBM) in aluminum-based greases by analyzing the effect of UV radiation on the rheological properties, antioxidant properties and UV absorption. Meanwhile, the authors evaluate the tribological properties of MDBM under different sliding modes and applied loads in aluminum-based greases. Design/methodology/approach In this work, the authors designed and synthesized an S- and P-free MDBM through a simple one-pot method and examined the tribological and UV-resistant performance of MDBM within aluminum complex grease. Findings The results show that MDBM has good friction-reducing and anti-wear properties, which is attributed to the adsorption of the MDBM itself and the generation of minor amount of MoO 3 on the worn surface at a maximum Hertzian contact pressure of 0.6 Gpa. The authors also reveal the strong UV resistance of MDBM in aluminum-based greases by analyzing the effect of UV radiation on the rheological properties, antioxidant properties and UV absorption, which is mainly attributed to self-keto-enol isomer interconversion from the special structure of β-diketone. Originality/value The work demonstrates a feasible way to develop novel multifunctional UV resistance organic molybdenum lubricating materials. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2025-0048/
研究领域:
材料科学
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摩擦学
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化学工程
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2021
·
IF 4.872
Jiao Wang,Shunzhen Ren,Zhipeng Li,Chenchen Wang,Xuefei Huang,Chao Fu,Lei Zheng,Tianhui Ren
In this study, we developed a new multifunctional mercaptotriazine-containing organic molybdenum with excellent properties to enhance the tribological performance of biodegradable based oils. The coefficient of friction and wear scar diameter are greatly reduced up to ~40% and ~44%, respectively. Surface analyses reveal that the tribofilm is mainly composed of FeS, FeSO 4 , Fe 2 O 3 , MoO 3 , MoS 2 and FeMoO 4 . Furthermore, the tribofilm also exhibits a layered structure with different chemical compositions, in which the sulfur in the body tribofilm mainly exists in the form of S 2− , SO 3 2− and SO 4 2− , while the sulfur in the subsurface of the tribofilm is mainly composed of S 2− and SO 4 2− . Our findings might pave the way for exploiting the multifunctional and environmentally-friendly lubricating materials.
研究领域:
材料科学
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润滑工程
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环境科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Liu Xinnan,Zhang Wentao,Huang Lunjie,Hu Na,Liu Wei,Liu Yingnan,Li Sihang,Yang Chengyuan,Suo Yourui,Wang Jianlong
A method is described for the rapid fluorometric determination of dopamine (DA) by using molybdenum disulfide quantum dots (MoS 2 QDs) that were fabricated via an ammonium hydroxide etching method. The probe has a fluorescence (with excitation/emission peaks at 267/380 nm) that is quenched by DA with high selectivity over various interferences. This is attributed to a reaction that occurs between DA and the molybdate ions in pH 9 solutions of MoS 2 QDs. The formation of organic molybdate complexes and of dopamine-quinone results in strong quenching of the fluorescence of the QDs which is due to both electron transfer and an inner filter effect. Under the optimum conditions, the assay works in the 0.1–100 μM DA concentration range, with two linear ranges and a 10 nM detection limit. The method was applied to the determination of DA in spiked artificial urine samples, where it gave recoveries ranging from 97.6 to 102.2%, demonstrating that the method a promising tool for rapid and selective detection of DA.
MoS 2 QDs are facilely synthesized via the etching effect of ammonium hydroxide for highly selective fluorometric detection of dopamine.
研究领域:
分析化学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）