Adsorption and Polymer Film Formation on Metal Nanoclusters
We examine experimentally and theoretically the effect of polymer adsorption layers on the stability of metal nanoclusters. We find that, somewhat contrary to expectation in this low volume fraction limit, the thickness of the adsorbed layer does not increase linearly with the number of repeating un...
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| Veröffentlicht in: | Macromolecules 2003-08, Vol.36 (17), p.6497-6502 |
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| container_title | Macromolecules |
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| creator | Tadd, Erica Zeno, Astra Zubris, Melissa Dan, Nily Tannenbaum, Rina |
| description | We examine experimentally and theoretically the effect of polymer adsorption layers on the stability of metal nanoclusters. We find that, somewhat contrary to expectation in this low volume fraction limit, the thickness of the adsorbed layer does not increase linearly with the number of repeating units in the chain (i.e., molecular weight), N. Rather, in the range we examine experimentally it decreases with molecular weight, in agreement with our model predictions. The number of contacts between the polymer chain and the cluster surface, i.e., polymer anchoring points, increases significantly with N, as does the polymer volume fraction in the adsorbed layer. As a result, although a large fraction of active surface sites remains available, particles stabilized by long chains resist flocculation, while particles stabilized by short chains do not. |
| doi_str_mv | 10.1021/ma034207z |
| format | Article |
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We find that, somewhat contrary to expectation in this low volume fraction limit, the thickness of the adsorbed layer does not increase linearly with the number of repeating units in the chain (i.e., molecular weight), N. Rather, in the range we examine experimentally it decreases with molecular weight, in agreement with our model predictions. The number of contacts between the polymer chain and the cluster surface, i.e., polymer anchoring points, increases significantly with N, as does the polymer volume fraction in the adsorbed layer. 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We find that, somewhat contrary to expectation in this low volume fraction limit, the thickness of the adsorbed layer does not increase linearly with the number of repeating units in the chain (i.e., molecular weight), N. Rather, in the range we examine experimentally it decreases with molecular weight, in agreement with our model predictions. The number of contacts between the polymer chain and the cluster surface, i.e., polymer anchoring points, increases significantly with N, as does the polymer volume fraction in the adsorbed layer. 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| subjects | Applied sciences Exact sciences and technology Organic polymers Physicochemistry of polymers Properties and characterization Solution and gel properties |
| title | Adsorption and Polymer Film Formation on Metal Nanoclusters |
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