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| 1 | Fabrication of cobalt hollow microspheres via a PVP-assisted solvothermal process显示文摘 | Chunju Xu Dan Nie Huiyu Chen Guizhe Zhao Yaqing Liu | 2013 | Materials Letters2013，，： | 1 |
| 2 | Polydopamine/polyethyleneimine co-crosslinked graphene oxide for the enhanced tribological performance of epoxy resin coatings显示文摘To enhance the wear resistance of graphene oxide(GO)nano-filled epoxy resin(EP)coatings with ex-cellent dispersion,GO were modified using a co-crosslinking strategy between polydopamine(PDA)and polyethyleneimine(PEI)through an environmentally friendly,simple and low-cost process.High-density amino-branched PEI and highly adhesive PDA formed covalent bond cross-links with GO(PDA/PEI-GO)through the Michael addition and Schiffbase reactions.With the introduction of amino active sites,the PDA self-polymerization reaction time was significantly shorted from 24 to 6 h.The covalently cross-linked network increased the lamellar spacing of GO and enhanced the interfacial bonds between the PDA/PEI-GO lamellae and EP matrix.Due to the improved dispersion and surface activity of GO,the PDA/PEI-GO nano-filled EP coating exhibited excellent wear resistance.Reciprocating friction with GCr15 stainless steel ball,the average friction coefficient and wear rate of the coating were reduced by 31.9%and 62.7%,respectively,compared to the pure EP coating.In addition,the wear mechanism of the PDA/PEI-GO/EP coating changed from adhesive and fatigue wear to abrasive wear,and it maintained good wear resistance by forming a GO lubrication transfer film on the counterpart surface.Therefore,this study may provide a new strategy for improving the dispersion of graphene in wear-resistant polymer materials for practical applications. | Shaofeng Zhou Jin Yan Jialin Chen Huimin Yan Yin Zhang Jin Huang Guizhe Zhao Qiaoxin Zhang Yaqing Liu | 2023 | Journal of Materials Science & Technology2023，，5： | 1 |
| 3 | Toughness and [a,b]-factors with inclusion/exclusion properties显示文摘In this paper, we investigate the existence of [a,b]-factors with inclusion/exclusion properties under the toughness condition. We prove that if an incomplete graph G satisfies t(G) (a-1) + ab and a,b are two integers with b > a > 1, then for any two given edges e1 and e2, there exist an [a,b]-factor including e1,e2; and an [a,b]-factor including e1 and excluding e2; as well as an [a,b]-factor excluding e1,e2 unless e1 and e2 have a common end in the case of a = 2. For complete graphs, we obtain a similar result. | WU ZeFang LIU GuiZhe YU QingLin | 2011 | Science China Mathematics2011，54，7： | 0 |
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