Publication details
Glass formation and confined melting in sol-gel derived nano- ZnO aggregates
| Authors | |
|---|---|
| Year of publication | 2014 |
| Type | Article in Periodical |
| Magazine / Source | Journal of Sol-Gel Science and Technology |
| MU Faculty or unit | |
| Citation | |
| web | http://link.springer.com/article/10.1007%2Fs10971-013-3184-5#page-7 |
| Doi | http://dx.doi.org/10.1007/s10971-013-3184-5 |
| Field | Physical chemistry and theoretical chemistry |
| Keywords | Nanoparticles; Melting confinement; ZnO; Sol-gel glasses |
| Description | Sol-gel processing of ZnO nanocolloids has been revisited to prepare various alkaline metal acetate (MAc: K, Na, Li-acetates) containing ZnO nanopowders. Using differential scanning calorimetry and X-ray diffraction investigations, several new relationships between the morphology and the thermodynamic behavior in the aforementioned particulate ZnO/MAc nanocomposites were noticed: (1) large MAc melting depression shifts -DTm * 80 C due to salt confinement within porous ZnO aggregates, (2) corresponding MAc crystallization and re-crystallization temperature depression shifts, (3) presence of multimodal pore size distributions within nanoaggregates and (4) glass formation at temperatures Tg between -40 and 130 C. We also note that the Tg value drops with rising alkaline metal size, increasing water content and decreasing ZnO particle size. In contrast, Tg rises in the case of co-doped Fe-LiAc/ZnO compositions. |
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