Facile Synthesis of Stable Cerium Dioxide Sols in Nonpolar Solvents

Abstract

A method is proposed for the preparation of stable sols of nanocrystalline cerium dioxide in nonpolar solvents, based on surface modification of CeO2 nanoparticles obtained by thermal hydrolysis of concentrated aqueous solutions of ammonium cerium(IV) nitrate with residues of 2-ethylhexanoic and octanoic acids. The synthesis was carried out at temperatures below 100 °C and did not require the use of expensive and toxic reagents. An assessment of the radical-scavenging properties of the obtained sols using the superoxide anion-radical neutralization model revealed that they demonstrate notable antioxidant activity. The results obtained indicate the potential of the nanoscale cerium dioxide sols in nonpolar solvents to be used for creating nanobiomaterials possessing antioxidant properties.

Modification of Polymeric Carbon Nitride with Au–CeO2 Hybrids to Improve Photocatalytic Activity for Hydrogen Evolution

“…As presented in Figure 1 , the diffraction peaks of pure CN located at 13.1° and 27.2° are attributed to the (100) and (002) planes, respectively. The diffraction peaks of CeAu at 2θ of 28.6°, 33.1°, 47.6°, 56.4°, 59.1°, 69.4°, 76.7°, 79.1° marked with “*” can be retrieved as well-crystallized face centered cubic structure of CeO 2 JCPDS (no.34-0394) [ 31 ], whereas the other peaks at 38.2°, 44.4°, 64.8° marked with “•” can be assigned to the face-centered cubic structure of Au corresponding to (JCPDS no. 89-3697), indicating the formation of Au NPs on the surface of CeO 2 [ 32 ].…”

Nanocrystalline ceria-based functional biomedical materials

“…Впервые предложен метод получения стабильных золей нанокристаллического диоксида церия в водных средах и апротонных полярных органических растворителях [1]. Такие материалы перспективны для трансдермальной доставки наночастиц CeO2, характеризующихся выраженными антиоксидантными свойствами, для ожоговой и раневой терапии [2][3][4][5].…”

Biocompatible ligands modulate nanozyme activity of CeO2nanoparticles

“…51 This technique allows for obtaining in nanoscale ceria with highly reproducible particle size (∼3.1 ± 0.3 nm) and high ζ -potential (40.1 ± 2.3 mV) which can be further modified by various organic molecules. 52,53 In order to exclude any pH effects on the redox chemistry of nanoscale CeO 2 , all the experiments were conducted under constant pH (phosphate buffer solution, pH 7.4).…”

“…[1][2][3][4] CeO 2 nanoparticles (CeO 2 NPs) are a very special enzyme mimic (nanozyme) exhibiting multiple enzyme-like catalytic properties. [5][6][7][8][9][10] Nowadays CeO 2 NPs were reported to exhibit superoxide dismutase (SOD)-, [11][12][13][14][15][16] catalase-, [17][18][19] peroxidase-, [20][21][22][23] oxidase-, [24][25][26] phosphatase-, 27 photolyase-, 28 phospholipase-, 29 nuclease-, 30 haloperoxidase-, 31 lipo-and phospholipoperoxidaselike 32 activities. This series can be supplemented with a relatively recently discovered uricase-like activity of cerium-containing mixed valence state metal organic frameworks.…”

“…34,35 An important factor which governs the functional characteristics of cerium-based biomaterials is the size of the CeO 2 NPs. The size effect has been traced in the catalytic 36,37 and photocatalytic 38,39 properties of ceria nanoparticles as well as in their enzyme-like activity including peroxidase-, 22 SOD-, 13 catalase-like 13 properties and antioxidant activity. 40,41 Another important factor in the chemistry of metal oxide nanoparticles, including CeO 2 NPs is the acidity (pH) of the medium.…”