Fig. 12. (A) The zinc-zinc pair distribution functions (PDFs) of the solvent in Hydrothermal Sintering system at different temperatures. Clustering of zinc atoms can be seen from the transition from wide distance distribution (blue line) to a sharp peak (red line).The distance between two zinc atoms in zinc-acetate is approximately 4.0 Å. (B) Visualization of zinc-acetate cluster and metal-organic complex obtained by ReaxFF MD simulations. Key: Zn2+ ion (grey), Oxygen atom (red), Hydrogen atom (white), Carbon atom (cyan). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).