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Colloidal Interactions of Inorganic Nanoparticles Grafted with Zwitterionic Polymer Brushes and Gels by Surface-Mediated Seeded Polymerization

Title
Colloidal Interactions of Inorganic Nanoparticles Grafted with Zwitterionic Polymer Brushes and Gels by Surface-Mediated Seeded Polymerization
Author
김진웅
Keywords
chain architectures; nanoparticles; suspension rheology; zwitterionic polymer
Issue Date
2014-08
Publisher
John Wiley & Sons, Ltd
Citation
Macromolecular rapid communications, 2014, 35(15), pp. 1356-1361
Abstract
A robust and straightforward approach is introduced to synthesize inorganic nanoparticles chemically grafted with a zwitterionic poly(2?methacryroyloxyethylphosphorylcholine) (PMPC) thin layers. The synthesis method is based on the surface?mediated seeded polymerization. In order to observe how the polymer chain architectures affect colloidal interactions, the zinc oxide nanoparticles are grafted with linear brushes and with a thin hydrogel layer, respectively. The thickness of PMPC shell layers spans a few nanometers. The studies on suspension rheology for the nanoparticles show that the nanoparticles with PMPC brushes show the stronger repulsive force than those with the PMPC gel shell due to the entropic stabilization. When the shear force is applied to the Pickering emulsion produced by assembly of the nanoparticles, it is noticeable that the presence of PMPC brushes on the particles rather enhances the drop?to?drop attraction, which presumably stems from the entanglement of polymer chains between the contacted interfacial planes of the emulsion droplets during shearing.
URI
http://onlinelibrary.wiley.com/doi/10.1002/marc.201400193/abstracthttp://hdl.handle.net/20.500.11754/47792
ISSN
1022-1336
DOI
10.1002/marc.201400193
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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