Synthesis of different sizes and functions nanoparticles.

摘要

Nanogels, whose size range from 1 to 100nm, have been interested in many research areas: cosmetics, pharmaceuticals, catalysts, photochemistry, and in optical switches or sensors. In Petroleum Engineering area, nanogels can be used as conformance control agent and emulsion stabilizer. And after grafting functional groups or hybrid, nanogels can be used as tracer for the visual modeling.;Though nanoparticles have been studied for more than 20 years, few of them are about nanogels. In the thesis, stirring rate, surfactant type and concentration were found have a large impact on the synthesis of nanogels. And cationic nanogels have salt and acid resistant properties.;In the thesis, the most used methods for synthesizing small size particles is reviewed. The experiments section covers three parts: a) microemulsion preparation, b) cationic nanoparticles synthesis and evaluation, c) nanoparticle size control. In microemulsion preparation part, optimum surfactants ratio of Span80 to Tween60 was given. In cationic nanoparticles synthesis and evaluation part, nanoparticles of different cationic degree were synthesized via suspension polymerization. And after introducing cationic groups to it, nanoparticles can have acid and salt resistant properties. In size control part, stirring rate, type and concentration of surfactants all affect the morphology and size of nanogels.