Functional Nanostructures from Sol-Gel Synthesis Using Keggin Polyoxometallate Phosphotungstic Acid as a Precursor.

ABSTRACT: Subjecting phosphotungstic acid solutions to low pH in combination with introduction of polyvalent cations led to the formation of nanostructured microspheres of approximately 2 μm in size, as shown by scanning electron microscopy, which were almost insoluble and resistant to degradation at neutral and high pH. These microspheres were composed of secondary nanospheres with diameters around 20 nm as revealed by transmission electron microscopy and atomic force microscopy. Investigations of the crystal structure of a potential intermediate of this process, namely, acidic lanthanum phosphotungstate, [La(H₂O)₉](H₃O)₃[PW₁₂O₄₀]₂(H₂O)₁₉, showed a tight network of hydrogen bonding, permitting closer

SUBMITTER: Greijer B 

PROVIDER: S-EPMC10880052 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature