AI Article Synopsis
- Researchers successfully created a monolithic macroporous zirconia (ZrO) using a specific sol-gel method that involves epoxide, propylene oxide (PO), and poly(ethylene oxide) (PEO) to control gelation and phase separation.
- By optimizing the starting materials, they achieved a zirconia monolith with a high porosity of 52.9% and a BET surface area of 171.9 m²/g.
- After treating the dried gel under solvothermal conditions with ammonia in ethanol, the structure was improved, yielding tetragonal ZrO with enhanced surface area of 583.8 m²/g while maintaining its macroporous characteristics.
Article Abstract
Monolithic macroporous zirconia (ZrO) derived from ionic precursors has been successfully fabricated via the epoxide-mediated sol-gel route accompanied by phase separation in the presence of propylene oxide (PO) and poly(ethylene oxide) (PEO). The addition of PO used as an acid scavenger mediates the gelation, whereas PEO enhances the polymerization-induced phase separation. The appropriate choice of the starting compositions allows the production of a macroporous zirconia monolith with a porosity of 52.9% and a Brunauer-Emmett-Teller (BET) surface area of 171.9 m · g. The resultant dried gel is amorphous, whereas tetragonal ZrO and monoclinic ZrO are precipitated at 400 and 600 °C, respectively, without spoiling the macroporous morphology. After solvothermal treatment with an ethanol solution of ammonia, tetragonal ZrO monoliths with smooth skeletons and well-defined mesopores can be obtained, and the BET surface area is enhanced to 583.8 m · g.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036470 | PMC |
| http://dx.doi.org/10.1088/1468-6996/16/2/025003 | DOI Listing |
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