Fabrication of Metal Oxides Occluded in Ordered Mesoporous Hosts via a Solid‐State Grinding Route: The Influence of Host–Guest Interactions

Abstract

Solid‐state grinding is a simple and effective method to include guest species into the channels of ordered mesoporous materials with a different degree of filling. After calcination, a monolayer or several monolayers of guest species can not only form highly dispersed oxide species and other surface species on the hosts whether the template is occluded in the channels or not, but the guest species can also fill the mesoporous channels in the host and thus lead to nanowires or nanoarrays. Solid‐state salt inclusion is faster and more convenient than other inclusion routes. The absence of a solvent not only saves the time otherwise needed for evaporation but also leads to a higher degree of filling through a simple inclusion step as the void space in the pores is not occupied by the solvent. Also, the lack of competitive adsorption of solvent molecules enhances the interaction between the guest species included and the silica wall, which facilitates the high dispersion of oxide species. However, host–guest interactions that are too strong may disturb the self‐crystallization of guest species in the mesopores leading to imperfect nanocasting of the mesostructure.

Facile preparation of stable palygorskite/methyl violet@SiO2 “Maya Violet” pigment

“…Solid-state grinding plays an important role in preparing Maya Blue and other functional materials by promoting the interactions between guest and host species [33][34][35]. The sample with an m MV /m PAL of 10% was used to study the effect of grinding time on stability of the PAL/MV pigments and the results are shown in Fig.…”

Fabrication of mesoporous Al-SBA-15 as a methylene blue capturer via a spontaneous infiltration route

“…Wet impregnation is the normal post-synthesis procedure, which makes all heteroatoms to be fully introduced into the mesoporous products. 27 This method is also very effective in fabrication of porous metal oxides 28,29 because of its practical advantages such as high degrees of pore filling in a single infiltration step and exclusion of solvents. 20 Previously, we developed a novel spontaneous infiltration technique to fast modify mesoporous materials.…”

Attempts to Synthesize Zeolitic Composites from Stellerite

“…X-ray diffraction test was performed on a Bruker D8Advance set with Cu K radiation to monitor the crystalline zeolite phase [7]. Infrared tests were performed on a set of Bruker Vedtor22 combined with the conventional KBr wafer technique [8].…”