Repositori URV

Identifier: TDX:333

Handle: https://hdl.handle.net/20.500.11797/TDX333

Authors:
Patti, Alessandro

Abstract:
Surfactants are amphiphilic molecules with a solvophilic head and a solvophobic tail. When the surfactant concentration in a given solution is high enough, the molecules aggregate between them to shield the solvophobic part from the contact with the solvent. Such aggregates can show very different sizes and shapes, according to the surfactant and the conditions of the system. The surfactants self-assembly, being due to an energetic and entropic compromise of their molecular structure, is fundamental to observe the formation of very ordered liquid crystals. In the presence of an inorganic precursor and depending on the interactions established between such a precursor and the surfactant, it is possible to synthesize a hybrid material. Hybrid materials are the key step for the formation of periodic ordered mesoporous materials, which can be obtained by eliminating the organic soft matter (the surfactants) from the inorganic framework. Periodic ordered mesoporous materials represent an important family of porous materials as they find a large number of applications in several industrial fields, such as separations, catalysis, sensors, etc. In the last decade, the range of potential applications has increased with the possibility of functionalizing the pore walls by incorporating organic groups during the synthesis, or with post-synthesis treatments.In this work, we are interested in studying the formation of ordered materials when hybrid organic-inorganic precursors are used. Lattice Monte Carlo simulations in the NVT ensemble have been used to study the equilibrium phase behavior and the synthesis of self-assembling ordered mesoporous materials formed by an organic template with amphiphilic properties and an inorganic precursor in a model solvent. Three classes of inorgan