One-step synthesis of highly dispersed nanosheets of magadiite

High performance NiOx nanoplatelet based films by a scrape-coating method for bifunctional electrochromic and energy storage devices

“…S3a (ESI†), even a small amount of added PEG4000 can effectively reduce the agglomeration of the particles and improve the uniformity of particle distribution. This can be attributed to the spatial dislocation effect and dispersing effect of PEG4000 which induces a certain repulsive force between nanoparticles, 45 increasing the uniformity of the nanoparticle coating and interconnecting NPs to form a porous nanoplatelet network-like structure (Fig. 3(b)).…”

Progress in Development of Magadiite to Produce Multifunctional Lamellar Materials

“…This morphology was also observed by Ma et al 72 in the hydrothermal synthesis of magadiites via heterogeneous nucleation using zirconia grinding balls (in the synthesis mixture) before hydrothermal treatment under static conditions at 160 °C and 96 h. The authors obtained mesoporous Zr-magadiite with a basal spacing of 1.56 nm. Finally, Yuan et al 66 used polyethylene glycol in direct synthesis under stirring, at 160 °C, for 24 h and formed in situ highly dispersed magadiite nanosheets.…”

“…All of these aspects are directly related to different synthesis procedures. ,,,− ,,,,− In general, two main methods are commonly described for the preparation of magadiite: (i) direct synthesis or bottom-up strategy, which consists of a mixture of reagents under specific reaction conditions to obtain solid magadiite in a single step and (ii) postsynthesis or top-down strategy, where the preformed magadiite is added to a solution containing the precursor or the active phase. In addition, in both methods, different wet or dry reaction pathways can be followed, in particular intercalation reactions, , pillarization, , delamination, , silylation, , dry impregnation, encapsulation, , seed-induced crystallization, , hydrothermal methods, , and recrystallization. , Depending on the approach applied, different active sites can be formed (e.g., open or closed, hydrated or dehydrated, framework species or extra-framework oxides), which can give rise to magadiite samples with distinct properties and with important morphological and structural differences.…”

“…In addition, this method allows the composition of the synthesis mixture to be modified by adding inorganic or organic precursors in a single step. In this way, different morphologies can be obtained under hydrothermal conditions. , …”

“…Different hydrothermal strategies involving a single step are being developed to improve the surface properties and modify the interlayer space or the Na-magadiite network. An example of this approach is the addition of metallic or organic precursors to the reaction mixture, allowing the application of these materials in catalysis. ,,,,,, Magadiites modified with different sources of Al (e.g., sulfate, hydroxide or isopropoxide of Al) and aged at 150 °C for 72 h, under static conditions and autogenous pressure, presented moderate to strong Brønsted acid sites and the possibility of the presence of Al tetragonally inserted in the framework, despite significant differences in the basal spacing values when compared with Na-magadiite. ,, Furthermore, the use of Al or Ti isopropoxide led to the formation of other phases in the framework, such as cristobalite and tridymite. , Also, a peak is observed at 2θ = 15–25°, which is typical of amorphization in modified magadiites with trivalent cationic species of Al, Co, and Er . Pires et al related these problems to the rate of hydrolysis, the high condensation of isopropoxide in basic medium, the aging time, and the order of the addition of reagents in the synthesis procedure.…”