Research Of Structure And Polishing Properties Of Nanopowders Based On Cerium Dioxide

2016 ◽  
pp. 249-260
Keyword(s):  
Cerium Dioxide

ACUTE TOXICITY OF CERIUM DIOXIDE NANOPARTICLES

2019 ◽  
pp. 56-62
Author(s):  
N. V. Khodykina ◽  
L. P. Tochilkina ◽  
O. N. Novikova ◽  
M. S. Sroslov ◽  
A. Ya. Pocheptsov ◽  
...  
Keyword(s):  
Toxic Effect ◽  
Cerium Dioxide ◽  
Intraperitoneal Administration ◽  
Body Weight Loss ◽  
The Body ◽  
Prooxidant Effect ◽  
High Exposure ◽  
Abdominal Organs ◽  
Metabolic Imbalance ◽  
Hematological Changes

The resorptive effects of 0.01 M cerium nanodioxide sol upon single intraperitoneal administration to rats have been studied. The acute exposure to nanoparticles was found to have a dose-dependent general toxic effect on the body (weight loss, inflammatory changes in the abdominal organs, modification of individual behavior, hematological changes, metabolic imbalance), which develops on the background of POL activation. The prooxidant effect of cerium dioxide nanoparticles is demonstratively manifested at relatively high exposure levels (80–8 mg / kg). The threshold dose for the general toxic effect (Limch integr) is equal to 0.8 mg / kg.

Decomposition of hydrogen peroxide on cerium dioxide-nickel oxide two-component catalysts and the effect of ionizing radiation on them

1984 ◽  
Vol 49 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Heat Treatment ◽  
Hydrogen Peroxide ◽  
Ionizing Radiation ◽  
Nickel Oxide ◽  
Cerium Dioxide ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Ion Pairs ◽  
Composition Region ◽  
Two Component

Some physical and catalytic properties of cerium dioxide-nickel oxide two-component catalysts have been studied over the entire composition region, employing the decomposition of hydrogen peroxide in aqueous solution as a model catalytic process. The two oxides have been found to affect each other, particularly for NiO contents of 9.1 and 96.7 mol%; the mutual influencing, the nature of which in the conditions applied remains unaffected by heat treatment of the sample or by its exposition to ionizing radiation, is manifested by the nonmonotonic dependences of the oxidation power and of the specific activity of the catalysts on their composition. This can be interpreted in terms of the concept of bivalent catalytic centres, assuming that for nickel oxide the centres consist of Ni2+-Ni3+ ion pairs, for cerium dioxide they consist of Ce3+-Ce4+ ion pairs, and that in the region of the mutual influencing , Ni2+-Ce4+ ion pairs play a major role. Within the scope of this concept, the increase in the oxidation power of all the catalysts in question and a simultaneously decrease in the specific activity of the pure nickeloxide exposed to ionizing radiation can be explained in terms of the ionization effect.

Luminescent-optical properties of cerium dioxide nanoparticles annealed in a reducing atmosphere

2019 ◽  
Author(s):  
A. V. Myshkina ◽  
I. N. Bazhukova ◽  
V. A. Pustovarov ◽  
S. Yu. Sokovnin
Keyword(s):  
Optical Properties ◽  
Cerium Dioxide ◽  
Reducing Atmosphere

Synthesis, structural and optical characteristics of vanadium doped cerium dioxide layers

Materialia ◽  
2021 ◽  
pp. 101143
Author(s):  
A. El-Habib ◽  
M. Addou ◽  
A. Aouni ◽  
M. Diani ◽  
J. Zimou ◽  
...  
Keyword(s):  
Cerium Dioxide ◽  
Optical Characteristics

Investigation of the effect of cerium dioxide nanoparticles on the radiosensitivity of various cell types

2020 ◽  
Author(s):  
M. V. Ulitko ◽  
A. S. Naumova ◽  
T. R. Sultanova ◽  
R. A. Vazirov ◽  
E. N. Agdantseva ◽  
...  
Keyword(s):  
Cerium Dioxide ◽  
Cell Types

Light mediated, switchable, antibacterial activity of cerium dioxide nanoparticles on gram positive and gram negative bacteria

2020 ◽  
Author(s):  
Rekhachandran Prasanna Ramachandran ◽  
Archana Valliyamma ◽  
Nitha Nellithanathu Thomas ◽  
Mangalaraja Ramalinga Viswanathan ◽  
Boby Theophilofe Edwin ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Cerium Dioxide ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative

Expansion of the Family of Molecular Nanoparticles of Cerium Dioxide and Their Catalytic Scavenging of Hydroxyl Radicals

2021 ◽  
Vol 60 (3) ◽  
pp. 1641-1653
Author(s):  
Kylie J. Mitchell ◽  
Justin L. Goodsell ◽  
Bradley Russell-Webster ◽  
Umar T. Twahir ◽  
Alexander Angerhofer ◽  
...  
Keyword(s):  
Hydroxyl Radicals ◽  
Cerium Dioxide ◽  
The Family ◽  
Molecular Nanoparticles

scholarly journals A nickel phosphide nanoalloy catalyst for the C-3 alkylation of oxindoles with alcohols

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shu Fujita ◽  
Kohei Imagawa ◽  
Sho Yamaguchi ◽  
Jun Yamasaki ◽  
Seiji Yamazoe ◽  
...  
Keyword(s):  
Precious Metal ◽  
Cerium Dioxide ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Nickel Phosphide ◽  
Cooperative Catalysis ◽  
Metal Phosphides ◽  
Borrowing Hydrogen ◽  
High Yields ◽  
Transition Metal Phosphides

AbstractAlthough transition metal phosphides are well studied as electrocatalysts and hydrotreating catalysts, the application of metal phosphides in organic synthesis is rare, and cooperative catalysis between metal phosphides and supports remains unexplored. Herein, we report that a cerium dioxide-supported nickel phosphide nanoalloy (nano-Ni2P/CeO2) efficiently promoted the C-3 alkylation of oxindoles with alcohols without any additives through the borrowing hydrogen methodology. Oxindoles were alkylated with various alcohols to provide the corresponding C-3 alkylated oxindoles in high yields. This is the first catalytic system for the C-3 alkylation of oxindoles with alcohols using a non-precious metal-based heterogeneous catalyst. The catalytic activity of nano-Ni2P/CeO2 was comparable to that reported for precious metal-based catalysts. Moreover, nano-Ni2P/CeO2 was easily recoverable and reusable without any significant loss of activity. Control experiments revealed that the Ni2P nanoalloy and the CeO2 support functioned cooperatively, leading to a high catalytic performance.

Elucidating the Origin of the Toxicity of Nano-CeO2 to Chlorella pyrenoidosa：the Role of Specific Surface Area and Chemical Composition

2021 ◽  
Author(s):  
Changjian Xie ◽  
Yuhui Ma ◽  
Peng Zhang ◽  
Junzhe Zhang ◽  
Xiaowei Li ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Aquatic Environment ◽  
Cerium Dioxide ◽  
Environmental Application ◽  
Ecotoxicological Effects

With the increasing environmental application and discharge of nano cerium dioxide (nano-CeO2), it is urgent to fully understand its ecotoxicological effects on the aquatic environment. This study for the first...

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