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Guangshuo Wang,Fei Zhou,Ziwei Lu,Yingying Ma,Xiaoguang Li,Yu Tong,Xufeng Dong 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-
In this study, we reported novel nanocomposites containing cobalt ferrite (CoFe2O4) nanoparticles andmolybdenum disulfide (MoS2) nanosheets (CoFe2O4/MoS2). The obtained CoFe2O4/MoS2 as dispersedphase was used to prepare magnetorheological (MR)fluid and the rheological properties wereinvestigated in detail. The results of transmission electron microscopy showed that the CoFe2O4nanoparticles were homogeneoused decorated on the surface of MoS2 nanosheets. The successfulpreparation of CoFe2O4/MoS2 was further confirmed by X-ray diffraction, X-ray photoelectronspectroscopy, Raman spectroscopy and vibrating sample magnetometer. The CoFe2O4/MoS2 based MRfluid exhibited typical MR effect with increasing viscosity, shear stress, yield stress and dynamic shearmoduli depending on external magneticfields. More importantly, the preparedfluid showed excellentsedimentation stability due to unique two-dimensional structure and reducedfluid-particle densitymismatch.
Guangshuo Wang,Dexing Zhao,Nannan Li,Yingzhe Zeng,Shuai Han,Yingying Ma,Xufeng Dong,Ruitao Yu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
In this study,flower-like Fe3O4 microspheres with hierarchical structure were prepared by a one-stepsolvothermal method, and the obtainedflower-like Fe3O4 microspheres were adopted as a newmagnetorheological (MR) material to prepare a uniform MR suspension with high performances. Thesynthesized samples were systematically examined using FE-SEM, TEM, TGA, XRD, XPS, BET and VSM. The preparedflower-like Fe3O4 microspheres-based MRfluid indicated typical MR properties, asevidenced by the fact that shear stress, yield stress, viscoelastic storage modulus and loss modulus of MRfluid strongly depended on magneticfield strengths. Specifically, the resultant MRfluid showed goodsedimentation stability with sedimentation ratio of 86.5% in the settling period. The excellentsedimentation stability could be attributed to the uniqueflower-like hierarchical structure, high specificsurface area and the reduced particle-fluid density mismatch.
Guangshuo Wang,Yingying Ma,Yu Tong,Xufeng Dong 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
Novel nanocomposites consisting of manganese ferrite nanoparticles and graphene oxide nanosheets(MnFe2O4/GO) have been synthesized as a promising candidate for magnetorheological (MR)fluid. Themorphology, microstructure, composition and magnetic properties of the obtained MnFe2O4/GO werestudied in detail. It was found that the MnFe2O4 nanoparticles with diameter of 8–12 nm were denselydecorated on the surface of GO nanosheets. The magnetization investigation revealed that as-preparedMnFe2O4/GO had superparamagnetic behavior with saturation magnetization of 36.2 emu/g. The MRfluid was prepared by the obtained MnFe2O4/GO and the corresponding MR properties were investigatedusing a Physica MCR301 rheometerfitted with a magneto-rheological module. The MnFe2O4/GO-basedMRfluid exhibited typical MR effect with increasing shear stress, yield stress and dynamic shear modulusdepending on magneticfields. More importantly, the sedimentation stability of the prepared MRfluidwas found to be improved due to the unique sheet-like structure and the reduced density mismatchbetween the dispersed particles and the carrier medium. The MnFe2O4/GO-basedfluid with typical MReffect and excellent sedimentation stability would provide a feasible candidate for practical applications
Chunxia Wu,XIAOLIANG ZHANG,HONGWEI CHE,JINGBO MU,Guangshuo Wang,Zhixiao Zhang,Guohua Cui 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.4
In this work, nano-convex-patterned polyimide surface (notated as 1-sample) and nano-concavepatterned polyimide surface (notated as 2-sample) were prepared by self-assembly and etching. Atomic force microscope (AFM) with a colloidal probe was used to examine the adhesion and nano-tribological behavior of the 1-sample and 2-sample. Results suggest that the 1-sample and 2-sample can decrease the surface friction and adhesive forces because of the decreased contact area between the contacting pairs. The friction forces of the 1-sample and 2-sample increased with the increase in sliding velocity and applied load. Moreover, the nano-concave pattern is more effective in reducing the adhesive force than the nano-convex pattern because of its higher surface roughness. However, the nano-convex patterning is more effective in reducing the friction force than the nano-concave patterning because of the smaller area of contact between the 2-sample and the colloidal probe.