2 research outputs found
Role of the Alkali-Metal Cation Size in the Self-Assembly of Polyoxometalate-Monolayer Shells on Gold Nanoparticles
Polyoxometalate (POM)-monolayer stability constants, <i>K</i>, for three POM anions vary with the cation size, in the
same order
as that for increasing ion-pair formation with α-SiW<sub>11</sub>O<sub>39</sub><sup>8–</sup> (<b>1</b>) in the early
nucleation phase of monolayer self-assembly: Li<sup>+</sup> < Na<sup>+</sup> < K<sup>+</sup> < Cs<sup>+</sup>. Cryo-TEM images demonstrating
the use of the cation size to rationally control monolayer formation
provide definitive evidence that the POM monolayers are electrostatically
stabilized (ionic) shells, analogous in that respect to the monolayer
walls of “hollow” POM-macroanion vesicles