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poly (Vf-co-St) 1

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Effects of polyethylenimine on the dispersibility of hollow silica nanoparticles

WEN Lixiong, WANG Qing, ZHENG Tianyuan, CHEN Jianfeng

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3, Pages 277-282 doi: 10.1007/s11705-007-0050-4

Abstract: In this study, two different methods were applied to disperse hollow silica nanoparticles (HSNP); one employed polyethylenimine (PEI) as the dispersant during the synthesis processes for preparing HSNP, while the other added PEI into suspensions of the prepared HSNP and used milling treatment to achieve the desired dispersion. It was found that adding PEI during the synthesis process of HSNP had no noticeable improvement in the dispersion, while adding PEI into suspensions of the prepared HSNP and utilizing milling treatment resulted in remarkable dispersion improvement. Therefore, the latter was chosen as the method in dispersing HSNP suspensions. The adsorption of PEI on the surface of HSNP and the stability of the aqueous suspensions was investigated. The results indicated that the adsorption of PEI on the surface of HSNP would increase the repulsive energy among particles, hence reducing the agglomeration of HSNP and improving the stability of the aqueous suspensions. The change of HSNP’s ζ potential after adding PEI and the relationship between the adsorbed amount of PEI and pH were also investigated.

Keywords： dispersion improvement different prepared HSNP relationship agglomeration

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Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes

Ran SHI,Hai WANG,Ping TANG,Yuezhen BIN

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 2, Pages 171-178 doi: 10.1007/s11705-014-1428-8

Abstract: To improve the dispersibility of carbon nanotubes (CNTs), poly(vinylferrocene- -styrene) (poly(Vf- -StThe addition of the poly(Vf- -St) greatly promoted the dispersibility of the modified CNTs in anhydrous

Keywords： vinylferrocene poly (Vf-co-St) CNTs dispersibility