| 초록 |
This study introduces a synthetic method to chemically graft a zwitterionic poly(2-methacryroyloxyethylphosphorylcholine) brushes and gels onto ZnO nanoparticles. For this, the seeded emulsion polymerization was carried out to coat the surface of double bond modified-ZnO nanoparticles with PMPC-based polymer layers. We could not only graft linear brushes onto the inorganic particles, but also chemically coat them with a hydrogel shell layer by crosslinking the brushes. Then, we carried out suspension rheology in order to determine how the two different colloidal systems affect the particle-to-particle interaction. We were able to observe a colloidal transition from a gel to a fluid in response to the applied shear force. Also, the attraction was influenced by both of electrostatic repulsion and steric hindrance. This result implies that control of surface chemistry is indeed important and plays a role in regulating particle-to-particle interactions in suspension. |
