Cerium oxalate hydrate particles were synthesized by precipitation technique under external magnetic field with respective intensities of 0,0.1,0.3,and 0.6 T.The particle morphologies were investigated by scanning ele...Cerium oxalate hydrate particles were synthesized by precipitation technique under external magnetic field with respective intensities of 0,0.1,0.3,and 0.6 T.The particle morphologies were investigated by scanning electron microscopy(SEM)and transmission electron microscope(TEM).Results show that external magnetic field has a great influence on the growth behavior of cerium oxalate hydrate particles.Rod-like and plate-like cerium oxalate hydrate particles with smaller size are formed without the applying of external magnetic field.However,the extremely big rod-like particles with the average size of 12.47μm were prepared under external magnetic field of 0.6 T.The increasing magnetic field intensity makes the grain grow quickly.Thermogravimetric analysis supports the presence of 8.5 H_(2)O molecules associated with cerium oxalate.Further,the growth mechanism of cerium oxalate hydrate under external magnetic field was briefly discussed.展开更多
Cerium dioxide(CeO2) has attracted much attention and has wide applications such as automotive exhaust catalysts,polishing materials for optical glasses and additives for advanced glasses,as well as cosmetic materials...Cerium dioxide(CeO2) has attracted much attention and has wide applications such as automotive exhaust catalysts,polishing materials for optical glasses and additives for advanced glasses,as well as cosmetic materials.The particle size and its distribution are key factors to the performance of the materials in the functional applications.However,control of particle size is still a challenge in materials synthesis.Therefore,continuous precipitation of cerium oxalate(precursor of ceria) was carried out at dif...展开更多
基金financially supported by the National Basic Research Program of China(Nos.51404148,51690162,and U15060202)Open Project of State Key Laboratory of Advanced Special Steel,Shanghai University(No.SKLASS 2017-03)。
文摘Cerium oxalate hydrate particles were synthesized by precipitation technique under external magnetic field with respective intensities of 0,0.1,0.3,and 0.6 T.The particle morphologies were investigated by scanning electron microscopy(SEM)and transmission electron microscope(TEM).Results show that external magnetic field has a great influence on the growth behavior of cerium oxalate hydrate particles.Rod-like and plate-like cerium oxalate hydrate particles with smaller size are formed without the applying of external magnetic field.However,the extremely big rod-like particles with the average size of 12.47μm were prepared under external magnetic field of 0.6 T.The increasing magnetic field intensity makes the grain grow quickly.Thermogravimetric analysis supports the presence of 8.5 H_(2)O molecules associated with cerium oxalate.Further,the growth mechanism of cerium oxalate hydrate under external magnetic field was briefly discussed.
基金supported by the National Natural Science Foundation of China (2056601, 50662002)
文摘Cerium dioxide(CeO2) has attracted much attention and has wide applications such as automotive exhaust catalysts,polishing materials for optical glasses and additives for advanced glasses,as well as cosmetic materials.The particle size and its distribution are key factors to the performance of the materials in the functional applications.However,control of particle size is still a challenge in materials synthesis.Therefore,continuous precipitation of cerium oxalate(precursor of ceria) was carried out at dif...
