METHODS FOR SEPARATING AND REDISPERSING NANO-MATERIALS

摘要

Methods for separating and redispersing nano-materials include the following steps: adding a kind of nonionic surfactant to an aqueous dispersion solution of nano-materials whose concentration is 10-6-1 mg/mL to obtain a mixture, the amount of the nonionic surfactant is 0.05-1wt% of the aqueous dispersion solution of nano-materials; heating the mixture at 30?-60? for 5-60 minutes; adding a kind of salt to the mixture and the amount of the salt is 0.01-1wt% of the mixture; separating the mixture into a two-phase system with an upper clear liquid and a lower cloud point phase having said nano-materials by centrifugal separating. In addition, by cooling the separated nano-materials dispersion from 30?-60? to 0?-20?, the nano-materials can be redispersed reversibly. The methods are suitable for separating and redispersing nano- materials in the field of nano-materials application.