Taylor, used a custom-built device that simulates the colon to investigate the effects of titanium dioxide (TiO2), zinc oxide (ZnO), and cerium dioxide
(CeO2) nanoparticles on microbiota from a healthy 26-year-old female.
, titanium dioxide and zinc oxide were specifically studied because of their prevalence in a range of products, including cosmetics, toothpaste and sunscreen.
In this review, an overview of the synthetic methods and their respective products is given for the most popular UV-absorbing nanomaterials, including zinc oxide, titanium dioxide, cerium dioxide
and ferrous oxides, and oxyhydroxides.
Zinc oxide and cerium dioxide
are among today's most widely used NPs.
Before 1995, the deposits were estimated to host 120 items of rare earth metals: oxide of yttrium group, phosphors K-77, K-84, lanthanum oxide and neodymium, cerium dioxide
, rare earth metals and alloys, beryllium.