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Accelerated methane storage in clathrate hydrates using surfactantstabilized suspension with graphite nanoparticles

Chinese Journal of Chemical Engineering 2020年第4期28卷 1112-1119页

作者： Liang Yang Xin Wang Daoping Liu Guomin Cui Binlin Dou Juan Wang Shuqing Hao Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China School of Environmental and Chemical Engineering Shanghai University of Electric PowerShanghai 200090China National Engineering Research Center of Coal Preparation and Purification China University of Mining&TechnologyXuzhou 221116China

In this study,enhanced kinetics of methane hydrate formation in the sodium dodecyl sulfate(SDS)solution with different concentrations of suspended graphite nanoparticles(GNPs)were investigated at 6.1-9.0 MPa and 274.15 *** GNPs with rough surfaces and excellent thermal conductivity not only provided a considerable number of microsites for hydrate nucleation but also facilitated the fast hydrate heat transfer in the suspension *** a relatively low pressure of 6.1 MPa,the suspension with 0.4 wt%of GNPs exhibited the minimum induction time of 22 min and maximum methane uptake of 126.1 cm3·***,the methane storage performances of the suspensions with higher and lower concentrations of GNPs were not *** the applied pressure,the temperature increase arising from the hydrate heat in the suspension system with the optimized concentration(0.4 wt%)of GNPs was more significant than that in the traditional SDS ***,compared with those of the system without GNPs,enhanced hydration rate and storage capacity were achieved in the suspensions with GNPs,and the storage capacities were increased by 3.9%-17.0%.The promotion effect of GNPs on gas hydrate formation at low pressure is much more obvious than that at high pressure.

关键词： methane storage clathrate hydrates formation kinetics suspension graphite nanoparticles

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Tribological and corrosion behavior of PEO coatings with graphite nanoparticles on AZ91 and AZ80 magnesium alloys

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 259-272页

作者： L.PEZZATO V.ANGELINI K.BRUNELLI C.MARTINI M.DABALà Department of Industrial Engineering University of Padua Department of Industrial Engineering Alma Mater StudiorumUniversity of Bologna

The effect of the addition of graphite nanoparticles into the electrolyte used to produce plasma electrolytic oxidation（PEO） coatings on AZ91 and AZ80 magnesium alloys was studied. The corrosion and wear resistances of the obtained coatings were investigated. A solution that contained both phosphates and silicates was used as electrolyte. Moreover, two different PEO treatment times were studied. The corrosion resistance was analyzed with potentiodynamic polarization and EIS tests; the wear resistance was investigated with a flat on ring tribometer. The results were related to the morphology, microstructure, elemental composition and thickness evaluated with SEM analysis. The presence of the graphite nanoparticles increased the thickness, produced a densification of the coating and sealed the pores on the surface, thus improving both the corrosion and wear resistance. The increase in the corrosion and wear resistances was more evident for AZ91 than for AZ80 due to the higher aluminum content.

关键词： plasma electrolytic oxidation wear resistance corrosion resistance magnesium alloy graphite nanoparticles

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