scholarly journals Effects of melting temperature on cerium oxidation state and crystallization on catalytic properties in cerium phosphate glasses

2017 ◽  
Vol 125 (3) ◽  
pp. 118-121 ◽  
Author(s):  
Ju-Hyeong KIM ◽  
Bong-Ki RYU
Keyword(s):  
Melting Temperature ◽  
Oxidation State ◽  
Catalytic Properties ◽  
Phosphate Glasses ◽  
Cerium Phosphate

Optical absorption of cerium phosphate glasses

1985 ◽  
Vol 4 (4) ◽  
pp. 399-402 ◽  
Author(s):  
Ravishankar Harani ◽  
C. A. Hogarth
Keyword(s):  
Optical Absorption ◽  
Phosphate Glasses ◽  
Cerium Phosphate

scholarly journals The preparation temperature influences the physicochemical nature and activity of nanoceria

2021 ◽  
Vol 12 ◽  
pp. 525-540
Author(s):  
Robert A Yokel ◽  
Wendel Wohlleben ◽  
Johannes Georg Keller ◽  
Matthew L Hancock ◽  
Jason M Unrine ◽  
...  
Keyword(s):  
High Temperature ◽  
Carboxylic Acids ◽  
Catalytic Properties ◽  
Cellular Protein ◽  
Protein Carbonyl ◽  
Surface Reactivity ◽  
Ion Release ◽  
Preparation Temperature ◽  
Cerium Phosphate

Cerium oxide nanoparticles, so-called nanoceria, are engineered nanomaterials prepared by many methods that result in products with varying physicochemical properties and applications. Those used industrially are often calcined, an example is NM-212. Other nanoceria have beneficial pharmaceutical properties and are often prepared by solvothermal synthesis. Solvothermally synthesized nanoceria dissolve in acidic environments, accelerated by carboxylic acids. NM-212 dissolution has been reported to be minimal. To gain insight into the role of high-temperature exposure on nanoceria dissolution, product susceptibility to carboxylic acid-accelerated dissolution, and its effect on biological and catalytic properties of nanoceria, the dissolution of NM-212, a solvothermally synthesized nanoceria material, and a calcined form of the solvothermally synthesized nanoceria material (ca. 40, 4, and 40 nm diameter, respectively) was investigated. Two dissolution methods were employed. Dissolution of NM-212 and the calcined nanoceria was much slower than that of the non-calcined form. The decreased solubility was attributed to an increased amount of surface Ce4+ species induced by the high temperature. Carboxylic acids doubled the very low dissolution rate of NM-212. Nanoceria dissolution releases Ce3+ ions, which, with phosphate, form insoluble cerium phosphate in vivo. The addition of immobilized phosphates did not accelerate nanoceria dissolution, suggesting that the Ce3+ ion release during nanoceria dissolution was phosphate-independent. Smaller particles resulting from partial nanoceria dissolution led to less cellular protein carbonyl formation, attributed to an increased amount of surface Ce3+ species. Surface reactivity was greater for the solvothermally synthesized nanoceria, which had more Ce3+ species at the surface. The results show that temperature treatment of nanoceria can produce significant differences in solubility and surface cerium valence, which affect the biological and catalytic properties of nanoceria.

Structure of Cerium Phosphate Glasses: Molecular Dynamics Simulation

2011 ◽  
Vol 94 (8) ◽  
pp. 2393-2401 ◽  
Author(s):  
Jincheng Du ◽  
Leopold Kokou ◽  
Jennifer L. Rygel ◽  
Yongsheng Chen ◽  
Carlo G. Pantano ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Phosphate Glasses ◽  
Dynamics Simulation ◽  
Cerium Phosphate
Sign in / Sign up

Export Citation Format

Share Document