AI Article Synopsis
- A new crystallization process combines microwaves with metal-induced devitrification, leading to faster and lower-temperature crystallization of titania (TiO2), starting as low as 125 °C in just a few minutes.
- Various metal cations such as Mn, Co, Ni, Al, Cu, and Zn effectively trigger this low-temperature crystallization.
- Advanced analytical techniques reveal that metal ions migrate through the glassy titania under microwave radiation before crystallization, resulting in suspended crystalline particles that can be easily processed without aggregation.
Article Abstract
Here, we present a new crystallization process which, by combining microwaves and metal-induced devitrification, reduces both the time and the temperature of crystallization compared to other known methods. Titania crystallization initiates at a temperature as low as 125 °C within a few minutes of microwave radiation. Several cations induce this low-temperature crystallization, namely, Mn, Co, Ni, Al, Cu and Zn. The crystallization mechanism is probed with electron microscopy, elemental mapping, single-particle inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, Auger electron spectroscopy, and scanning Auger mapping. These techniques show that the metal ion migration through the vitreous titania under microwave radiation occurs prior to crystallization. The crystalline particles are suspended in solution at the end of the treatment, avoiding particle aggregation and sintering. The crystalline suspensions are thus ready for processing into a material or employment in any other application. This combination of microwaves and metal-induced crystallization is applied here to TiO, but we are investigating its application to other materials as an ecofriendly crystallization method.
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| http://dx.doi.org/10.1021/acs.inorgchem.0c00358 | DOI Listing |
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