CdS and Cd carboxylate nanoclusters dispersed in polymer matrix produced by a freeze drying method
| Autor: | Frederic Cosandey, Chonggang Wu, Thomas J. Emge, Masanori Hara |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Cadmium Materials science Polymers and Plastics Organic Chemistry Inorganic chemistry General Physics and Astronomy chemistry.chemical_element Polymer Cadmium sulfide Nanoclusters chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Carboxylate Methyl methacrylate Ionomer Cadmium acetate |
| Zdroj: | European Polymer Journal. 49:3530-3538 |
| ISSN: | 0014-3057 |
| DOI: | 10.1016/j.eurpolymj.2013.08.017 |
| Popis: | Cadmium sulfide (CdS) nanoclusters were prepared by a freeze drying method from two types of cadmium carboxylates. One was cadmium methacrylates that were part of poly(methyl methacrylate) (PMMA) ionomer. The other was cadmium acetates that were dispersed in PMMA. X-ray diffraction was mainly used to study the formation and the size of nanoclusters. The size of CdS made from the ionomer was 0.9 nm, whereas that from the composite of cadmium acetate and PMMA was 2 nm. This was consistent with the size difference of the precursors of CdS: i.e., Cd carboxylate nanoclusters (ionic aggregates) were smaller in the ionomer than in the PMMA mixture, because ionic groups in the ionomer were constrained due to their connectivity to backbone chains and thus forming smaller ionic aggregates. Once stabilized, however, CdS nanocluster sizes were unchanged despite thermal treatments at up to 220 °C for 24 h for both systems. Structural transformations from a freeze dried cadmium carboxylate powder, to a CdS-containing powder, and to a heat-treated CdS-containing sample are speculated for both types of systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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