A Comparative Study of Cerium(III) and Cerium(IV) Phosphates for Sunscreens.

Crystalline cerium(III) phosphate (CePO), cerium(IV) phosphates, and nanocrystalline ceria are considered to be promising components of sunscreen cosmetics. This paper reports on a study in which, for the first time, a quantitative comparative analysis was performed of the UV-shielding properties of CePO, Ce(PO)(HPO)(HO), and CePO/CeO composites. Both the sun protection factor and protection factor against UV-A radiation of the materials were determined.

Gadolinium Doping Modulates the Enzyme-like Activity and Radical-Scavenging Properties of CeO Nanoparticles.

Their unique physicochemical properties and multi-enzymatic activity make CeO nanoparticles (CeO NPs) the most promising active component of the next generation of theranostic drugs. When doped with gadolinium ions, CeO NPs constitute a new type of contrast agent for magnetic resonance imaging, possessing improved biocatalytic properties and a high level of biocompatibility. The present study is focused on an in-depth analysis of the enzyme-like properties of gadolinium-doped CeO NPs (CeO:Gd NPs) and their antioxidant activity against superoxide anion radicals, hydrogen peroxide, and alkylperoxyl radicals.

Coating of Filter Materials with CeO Nanoparticles Using a Combination of Aerodynamic Spraying and Suction.

Textiles and nonwovens (including those used in ventilation systems as filters) are currently one of the main sources of patient cross-infection. Healthcare-associated infections (HAIs) affect 5-10% of patients and stand as the tenth leading cause of death. Therefore, the development of new methods for creating functional nanostructured coatings with antibacterial and antiviral properties on the surfaces of textiles and nonwoven materials is crucial for modern medicine.

Heavily Gd-Doped Non-Toxic Cerium Oxide Nanoparticles for MRI Labelling of Stem Cells.

Recently, human mesenchymal stem cells (hMSc) have attracted a great deal of attention as potential therapeutic agents in the treatment of socially significant diseases. Despite substantial advances in stem-cell therapy, the biological mechanisms of hMSc action after transplantation remain unclear. The use of magnetic resonance imaging (MRI) as a non-invasive method for tracking stem cells in the body is very important for analysing their distribution in tissues and organs, as well as for ensuring control of their lifetime after injection.

The Strong Protective Action of Ce/F Combined Treatment on Tooth Enamel and Epithelial Cells.

We studied the toxic effects of cerium and fluoride species on human dental pulp stem cells and epithelial cells of as a surrogate for the human oral mucosa. The sequential use of CeCl and NHF solutions in equimolar sub-toxic concentrations enabled the possible toxic effects of individual components to be avoided, ensuring the preservation of the metabolic activity of the cells due to the formation of CeF nanoparticles. Cerium fluoride nanoparticles and terbium-doped cerium fluoride nanoparticles exhibited neither cytotoxicity nor genotoxicity to dental pulp stem cells, even at high concentrations (10 M).

Meet the Cerium(IV) Phosphate Sisters: Ce (OH)PO and Ce O(PO ).

Two new cerium(IV) phosphates were obtained: cerium(IV) hydroxidophosphate, Ce(OH)PO , and cerium(IV) oxidophosphate, Ce O(PO ) , which were shown to complement the classes of isostructural compounds M(OH)PO and R O(PO ) , where M=Th, U and R=Th, U, Np, Zr. Ce O(PO ) oxidophosphate is formed by elimination of H O from the crystal structure of Ce(OH)PO during its thermal decomposition. The structures of Ce(OH)PO and Ce O(PO ) are related to each other with the same Cmce space group and similar unit cell parameters (a=6.

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO Nanoparticles.

Tungsten oxide-based bulk and nanocrystalline materials are widely used as photocatalytic and photo- and electrochromic materials, as well as materials for biomedical applications. In our work, we focused our attention on the effect of sodium cations on the structure and photochromic properties of the WO@PVP aqueous sols. To establish the effect, the sols were synthesized by either simple pH adjusting of sodium or ammonium tungstates' solutions, or using an ion exchange technique to remove the cations from the materials to the greatest possible extent.