کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1459397 989592 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
In situ HT-ESEM study of crystallites growth within CeO2 microspheres
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
In situ HT-ESEM study of crystallites growth within CeO2 microspheres
چکیده انگلیسی

Cerium dioxide is widely studied due to its potential interest in several applications, including heterogeneous catalysis. In this field, modifications of the crystallographic orientations and surface reactivity of CeO2 can lead to activity loss of metal supported catalysts. In situ High Temperature-Environmental Scanning Electron Microscopy observations were then developed to monitor such evolution in CeO2 spherical particles. Microspheres with 300–800 nm diameter were heat treated for 1–120 min in the 1000–1200 °C range. Subsequent image analysis led to monitor and quantify the crystallite growth during isotherm dwells. Two distinct mechanisms controlling the growth of crystallites in a single microsphere were then evidenced depending on the heating duration, i.e. oriented attachment then diffusion. Precise control of the aggregates inner structure (number of crystallites and density) was also achieved and described as a nanostructure map. These results pave the way to new opportunities in nanoparticle design.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 41, Issue 10, Part B, December 2015, Pages 14703–14711
نویسندگان
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