Abstract
Silica-poly(acrylic acid) (PAAc) core–shell nanoparticles (NPs) were successfully preparedvia graft copolymerization of acrylic acid (AAc) onto vinyl-bond-modified silica NPs.Transmission electron microscopy (TEM) results indicated that the obtained microphereshave a core–shell morphology. Fourier transform infrared (FTIR) analysis and x-rayphotoelectron spectroscopy (XPS) measurements confirmed that the surface of thenanoparticles was polymer-rich, consistent with the core–shell morphology. The influence ofthe synthetic conditions, such as reaction time and AAc concentration on thegraft yield of PAAc grafted on the silica NPs was investigated. Dynamic lightscattering (DLS) analysis showed that the silica-PAAc core–shell nanoparticlespossessed excellent response to pH and ion strength. Because of their pH-responsivebehavior and small feature size, nanostructure devices designed from the smartsilica nanoparticles have potential applications including sensors and membranes.
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