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Lehua Cheng,Enzhu Hu,Xianquan Chao,Renfa Zhu,Kunhong Hu,Xianguo Hu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
A nano-MoS2/montmorillonite K-10 (K10) composite was prepared and characterized. The composite contains two types of 2H-MoS2 nanoparticles. One is the hollow spherical MoS2 with a size range of 75 nm, and the other is the spherical nano cluster of MoS2 with a size range of 30 nm. The two kinds of nano-MoS2 were formed via assembly of numerous MoS2 nano-platelets with a size of ~10 nm. A tribological comparison was then made among nano-MoS2/K10, K10, nano-MoS2 and a mechanical mixture of K10 and nano-MoS2. K10 reduced the wear but slightly increased the friction. Nano-MoS2 remarkably reduced both friction and wear. The mechanical mixture demonstrated better wear resistance than nano-MoS2, indicating a synergistic anti-wear effect of nano-MoS2 and K10. The synergistic effect was reinforced using nano-MoS2/K10 instead of the mechanical mixture. A part of the MoS2 in the contact region always lubricated the friction pair, and the rest formed a tribofilm. K10 segregated the friction pair to alleviate the ablation wear but magnified the abrasive wear. S-MoS2 protects K10 and they together function as both a lubricant and an isolating agent to reduce the ablation and abrasive wear.
Lehua Cheng,Dongrui Yu,Enzhu Hu,Yuchao Tang,Kunhong Hu,Karl David Dearn,Xianguo Hu,Min Wang 한국탄소학회 2018 Carbon Letters Vol.26 No.-
An electroless deposition method was used to modify the surface properties of rice husk ceramic particles (RHC) by depositing nano-nickel on the surface of the RHC (Ni-RHC). The dry tribological performances of aluminum matrix composite adobes containing different contents of RHC and Ni-RHC particles have been investigated using a micro-tribometer. Results showed that the Ni–RHC particles substantially improved both the friction and wear properties of the Ni-RHC/aluminum matrix adobes. The optimal concentration was determined to be 15 wt% for both the RHC and Ni–RHC particles. The improvements in the tribological properties of aluminum adobes including the Ni-RHC were ascribed to frictioninduced peeling off of Ni coating and formation of protection layer on the wear zone, both of which led to low friction and wear volume.
Wei Zhang,Chao Hu,Jie Tan,Zhujun Fan,Fangli Chi,Yaxin Sun,Songlin Ran,Xianguo Liu,Yaohui Lv 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6
The composite α-FeOOH nanorods/Ag3PO4 photocatalyst has been successfully fabricated through a facile hydrothermal process combined with a successive in situ precipitation technique. The SEM and TEM images show that Ag3PO4 particles have been successfully loaded on the surface of FeOOH nanorods. The photocatalytic activities of the α-FeOOH/Ag3PO4 composite were investigated for their efficiency on the degradation of Rhodamine B (RhB) under ultra-violet light and visible light irradiation, and the results showed that the α-FeOOH/Ag3PO4 composite possessed remarkable photocatalytic activities. The enhanced photocatalytic activity can be attributed to the strong absorption in visible light and the effective separation of photogenerated hole–electron pairs between Ag3PO4 and α-FeOOH.
Weimin Feng,Hui Song,Ziyan Lu,ZhiquanYang,Xianguo Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
The zinc dialkyl dithiophosphate (ZDDP) as multi-effect additive used in lubricating oil has always beenpaid more attention on the antioxidation, anticorrosion and antiwear performances. How to explain itsrole in tribology field has been paid more attention in the world. This studying showed a new insight intothe antiwear mechanism from the perspective of tribofilm of lubricating oil containing ZDDP using SEM/EDS, Raman spectrometer, atomic force microscope (AFM) etc. It was found that ZDDP tribofilm containeda little graphitic carbon and iron oxides besides metal phosphates and sulfides. The bonding of ZDDP tribofilmto the substrate was stronger than that of base oil (poly-alpha-olefin, PAO) tribofilm. The mechanicalproperties of ZDDP tribofilm were more stable than those of PAO tribofilm. Statistical analysisrevealed that ZDDP tribofilm was harder and less adhesive effects than PAO tribofilm, which might provideit with the ability to resist abrasive and adhesive wear. The similar elastic modulus of the two kindsof films indicated their similar plastic deformation. Moreover, the micro friction-reducing ability of ZDDPtribofilm might be the origin of ZDDP reducing the macro friction under boundary lubrication.
Chuan Li,Xinxin Wang,Qiangqiang Zhang,Xu Tan,Yefeng Liu,Honglin Li,Hao Liu,Enzhu Hu,Xianguo Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
This study fabricated nano-CeO2/biodiesel carbon soot (BCS) composites using the raw material BCS,which is the byproduct of biodiesel combustion and cerium salt and used as a novel lubricant additiveto PAO6 for steel/steel contact. Oleylamine modified nano-CeO2/BCS composites comprise abundant lipophilicgroups, and thus nano-CeO2/BCS composites exhibit good dispersion in PAO6. The tribologicalresults showed that nano-CeO2/BCS composites significantly improved the lubricating performances ofPAO6. In case of 0.1 wt% nano-CeO2/BCS composites dispersed in PAO6, the friction coefficient and wearvolume were reduced by 17.3 and 35.2%, respectively. The improved tribological properties were attributedto the composites rolling and forming of a lubricating film on the friction surface and the presence ofBCS and CeO2 in composites exerting a synergistic lubricating effect, which simultaneously improved thetribological properties of PAO6. This discovery contributes to the conversion of BCS into valuables andpromotes the high value utilization of BCS as a lubricating additive.