Morphology selection of nanoparticle dispersions by polymer media |
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Authors: | Kim Jaeup U O'Shaughnessy Ben |
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Institution: | Department of Physics, Columbia University, New York, New York 10027, USA. |
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Abstract: | Designable media can control properties of nanocomposite materials by spatially organizing nanoparticles. Here we theoretically study particle organization by ultrathin polymer films of grafted chains ("brushes"). Polymer-soluble nanoparticles smaller than a brush-determined threshold disperse in the film to a depth scaling inversely with particle volume. In the polymer-insoluble case, aggregation is directed: provided particles are nonwetting at the film surface, the brush stabilizes the dispersion and selects its final morphology of giant elongated aggregates with a brush-selected width. |
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