General Information to Obtain Spherical Particles with Ordered Mesoporous Structures

Abstract

Conditions for the synthesis of aluminum organophosphonate (AOP) and aluminophosphate (AlPO) spheres containing periodic mesopores were optimized and demonstrated to be general morphological controls for the surfactant-assisted synthesis of mesoporous materials. High-quality AOP and AlPO spheres with uniform mesopores were obtained at low and high temperatures, respectively. The aerosol-assisted synthesis of materials with uniform mesopores was categorized by using the difference in relative density of soluble AOP and AlPO oligomers that interact with ethylene oxide (EO) units in EO(n)PO(m)EO(n) triblock copolymer (PO=propylene oxide). Then, ordered mesoporous structures are constructed with the adequate amount of species in resultant frameworks, and the number of interactive points in soluble species determines the resultant density of the frameworks after self-assembly. Consequently, temperature-dependent synthesis, which allows controlled infiltration of soluble species to match the density of resultant frameworks, is required for the formation of ordered mesoporous structures under morphological control.

Preparation of a hierarchically porous AlPO4monolith via an epoxide-mediated sol–gel process accompanied by phase separation

“…A lot of benefits are expected to arise from the co-continuous structure integrated in monoliths. Moreover, mesoporous aluminum organophosphonates are also reported [38–41], and we deduced that aluminum organophosphonates can also be prepared by phase separation with the sol–gel route.…”

Molecular Design of Bisphosphonates To Adjust Their Reactivity toward Metal Sources for the Surfactant‐Assisted Synthesis of Mesoporous Films

“…Almost all mesoporous materials have so far been obtained as films because the evaporation-induced selfassembly (EISA) process can be applied well for fabricating such films. [30][31][32] However,o ne of the main concerns comes from the difficulty in handling fast sol-gel reactions (e.g., alumina and titania) during every process.E ven after the coating of precursor solutions with chemical compositions optimal for the formation of highly ordered mesostructures, further condensation of inorganic species occurs in the resultant inorganic frameworks. [16,33,34] Even in the case of powders,aprecursor solution has often been transferred to many dishes to adjust the EISA process by rapid solvent evaporation, and then milled into its powder sample with an ordered mesostructure.…”

Insights into mesoporous metal phosphonate hybrid materials for catalysis

“…(c) UV/Vis diffuse-reflectance spectra of PMTP-1 before (solid line) and after Cu 2+ ion loading (dashed line); b) one-pot heavy metal ion adsorption in the wastewater treatment as well as Rhodamine B photodegradation by using PMTP-1 under simulated solar light irradiation. 87 One step further based on phosphonate-mediated photocatalysis is to find their qualification as photoanode materials in photoelectrochemical field, in which photogenerated electrons transfer to external circuit while separated holes from photosensitizers act as oxidants to oxidize electrolytes. Titanium phosphonate material with a mesoscopic void space and a self-assembled nanostructure was synthesized using conjugated benzene-1,3,5-triphosphonic acid.…”

“…38,54,64,87,118,123 Also, the doping effect of organophosphorus sources can extend the absorbance spectrum of titanium oxide to visible light region. 47,93,133 Furthermore, the construction of heterojunction structure at the semiconductor interface is suggested to enhance the separation efficiency of photogenerated electron−hole pairs during the photocatalytic process.…”