| Title |
Detrimental Effect and Neutralization of in Situ Produced Water on Zirconia Nanoparticles Obtained by a Nonaqueous Sol脙垄脗聢脗聮Gel Method |
|
Authors |
Gambe, Jess; Re脙聝脗聦脙聜脗聛mondie脙聝脗聦脙聜脗聙re, Fabien; Jouin, Jenny; Portal,Laura; Thomas, Philippe; Masson, Olivier |
|
Publication date |
2019/10/30 |
|
Journal |
Inorganic Chemistry |
| Volume |
58 |
| Issue |
22 |
| Pages |
15175-15188 |
| Publisher |
ACS Publication |
| Abstract |
In this work, the phase purity and size of zirconia
nanocrystals samples were studied in terms of zirconium concentration,
added water content, and subsequent use of a post
solvothermal treatment. The progressive tetragonal-to-monoclinic
transformation of zirconia sample was observed to be strongly related
to the water content of the alcoholic medium. But more surprisingly,
it has been shown that even under initially anhydrous conditions and
for particle size below 5 nm, the phase purity of the samples was
deteriorated by a side-reaction of alcohol dehydration catalyzed by
the surface of the nanoparticles (NPs). Since the phase transformation
is essentially driven by the water content of the reaction
mixture, we have shown that it was possible to recover an excellent
phase purity without the help of any usual dopants by adding a strong alkaline desiccating agent. Provided that a sufficient
sodium to zirconium ratio was ensured, the formation of the monoclinic phase was not observed whatever the zirconium
precursor concentration. The effectiveness of this cure was related to the ability of sodium metal to generate reactive alkoxide
able to neutralize water and to catalyze an alternative sol脙垄脗聢脗聮gel mechanism leading to the formation of the t-ZrO2 NPs. |
| Index terms / Keywords |
Zirconia, Nanoparticles, Nonaqueous, Sol脙垄脗聙脗聯Gel |
| DOI |
|
| URL |
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Mindanao State
University - Iligan Institute of Technology