Academic Journal
Preparation, characterization, and kinetic and thermodynamic studies of mixed-phase TiO2 nanoparticles prepared by detonation method
| العنوان: | Preparation, characterization, and kinetic and thermodynamic studies of mixed-phase TiO2 nanoparticles prepared by detonation method |
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| المؤلفون: | Yandong Qu, Conghuang Sun, Guilei Sun, Xiangqing Kong, Wenjiao Zhang |
| المصدر: | Results in Physics, Vol 6, Iss , Pp 100-106 (2016) |
| بيانات النشر: | Elsevier, 2016. |
| سنة النشر: | 2016 |
| المجموعة: | LCC:Physics |
| مصطلحات موضوعية: | Physics, QC1-999 |
| الوصف: | Although detonation method has been reported to prepare TiO2 nanoparticles, phase transformation and crystal growth of detonation-prepared TiO2 nanoparticles have not been explored extensively. In this study, mixed-phase TiO2 nanoparticles, consisting of anatase (34.8 wt%, ∼9.4 nm) and rutile (65.2 wt%, ∼18.2 nm), were prepared by the detonation method. The phase transformation in the TiO2 sample at different annealing temperatures was modeled to understand the transformation behaviors. Thermal treatment experiments of the detonation-prepared TiO2 nanoparticles indicated that the initial process involved an anatase-to-rutile transformation. The TiO2 grains coarsened drastically after thermal treatment at 600 °C for 1 h. In contrast to a normal transformation, the anatase-to-rutile transformation was followed by conversion of rutile to anatase in large crystals. Moreover, smaller TiO2 particles could gain more kinetic energy and combine rapidly with the increase in temperature, forming larger particles. Anatase was transformed completely to rutile after thermal treatment at 720 °C for 3.5 h. The transformation temperature from anatase to rutile of the detonation-prepared TiO2 nanoparticles was approximately 80 °C lower than that of TiO2 prepared by conventional methods. Therefore, thermal treatment may be employed to control the particle size and phase content of detonation-prepared TiO2 nanoparticles. Keywords: Transformation, TiO2 nanoparticles, Growth kinetics, Detonation method, Thermal treatment |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2211-3797 12126438 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S2211379716000267; https://doaj.org/toc/2211-3797 |
| DOI: | 10.1016/j.rinp.2016.02.006 |
| URL الوصول: | https://doaj.org/article/3f7ffce1212643878365f9b678c362b5 |
| رقم الانضمام: | edsdoj.3f7ffce1212643878365f9b678c362b5 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 22113797 12126438 |
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| DOI: | 10.1016/j.rinp.2016.02.006 |