ZnO-based hollow microspheres with mesoporous shells: Polyoxometalate-assisted fabrication, growth mechanism and photocatalytic properties

Esterification of Palm Fatty Acid Distillate Using a Sulfonated Mesoporous CuO‐ZnO Mixed Metal Oxide Catalyst

“…The TEM image in Fig. d confirms the presence of irregular pores with the approximate size of 4 nm which was in accordance with the previous report .…”

Facile One‐Step Synthesis of Mesoporous Tin Oxide Hollow Spheres and Their Functionalized Nanoreactor Variants

“…Until now, the general procedures for preparing hollow nanostructures can be divided into two categories: template‐free and templating approaches. Although template‐free techniques involve relatively fewer synthetic steps and are thus considered to be quite facile, they often lack good control of the size and shape of hollow structures over the reaction process. On the other hand, the templating method generally involves the use of either hard or soft templates and offers several advantages, including narrow size distribution and well‐defined structural features .…”

Trisodium citrate as bridging and suppressing agent to control synthesis of ZnO hollow hierarchical microspheres and their photocatalytic properties

“…In our experiments, the ZnO hollow microspheres with remaining ZnO core are fabricated without additional ammonia in Figure 3a,b. Therefore, as Zn(OH) 2 particles in the core are etched, remaining ZnO particles are dissolved gradually and oriented attachment sideway to the shell on prolonging the reaction time [39]. Wang and co-workers have recently reported that the ZnO hollow spheres with double-yolk egg structure, single-yolk egg structure, and single-shell structure were obtained by Ostwald ripening process.…”