Enhancement of Water Solubility of Single-Walled Carbon Nanotubes by Formation of Host-Guest Complexes of Cyclodextrins with Various Guest Molecules

摘要

Solubilization of single-walled carbon nanotubes(SWNTs)by physical adsorption of cyclodextrins(CDs),guest molecules,and host-guest complexes was investigated.As guest compounds,sodium adamantanecar-boxylate(AdCNa),sodium dodecylbenzenesulfonate(SDBS),sodium ursodeoxycholate(UdCNa),sodium ferrocenecarboxylate(FeCNa),and TritonX-405 were employed.As host compounds,alpha-,beta-,and gamma-cyclo-dextrins(alpha-,beta-,and gamma-CDs)were used.By using CDs as a solubilizing agent,SWNTs were insoluble in aqueous media.In the presence of AdCNa and FeCNa,solubility of SWNTs was dramatically increased by formation of host-guest complex with beta-or gamma-CDs.By using SDBS-CD complexes,solubility of SWNTs was also enhanced compared to only guest molecules.On the other hand,solubility of SWNTs was decreased by formation of host-guest complexes of UdCNa and TritonX-405 with CDs.Formation of host-guest complex mostly resulted in enhancement of water solubility of SWNTs.