Hierarchical mesoporous silica templated by the combination of fine emulsion and micelles

Abstract

Concentrated emulsions have been widely considered as templates for the preparation of macroporous structures. Replacing concentrated emulsions by fine ones should rather lead to materials having large mesopores. However, fine emulsions were barely investigated for this purpose. On the other hand, mesostructured silica SBA-15 can be prepared from Pluronic P123 micelles according to the cooperative templating mechanism. Starting from mixture of fine emulsion and Pluronic P123 micelles, it is expected to obtain silicas with a controlled hierarchical mesoporosity. The fine emulsion has been formulated from the Kolliphor/Myristate/Water system. To get informations concerning the degree of compatibility between the two surfactants, which can affect the formation of the porous materials, the Kolliphor/P123/water system has been investigated in detail. The structural parameters of the mixed liquid crystal phases have been determined and the mixed micellar structure has been investigated by SAXS. The hierarchical porous silicas have been synthetized combining fine emulsion and Pluronic micellar solution. The materials porosity features strongly depend on the weight proportion between the fine emulsion and the P123 micelles. If this proportion is lower than 5/5, mesoporous silicas present a dual mesoporosity. By contrast, by increasing this proportion the mesopore size distribution only shows large mesopores.

Tunable synthesis of dendritic fibrous nano silica using 1-pentanol-water microemulsion at low oil to water ratio

“…When TEOS concentration is low, the hydrolysis rate is higher than the condensation rate, and the nucleation rate is greater than the polymerization rate macroscopically, which leads to a small particle size of the final product. As the TEOS concentration increased, the condensation rate was slowly higher than the hydrolysis rate (equations ( 1)-( 3)) [39,50]. The growth rate on the primary particles was more significant than the nucleation rate, resulting in the particle size increased, which explains the increase in the particle size of DFNS when the TEOS addition is increased from 9 to 18 ml, and this positive correlation is not infinite.…”

“…And TMB often exists as a pore spreading agent, which can change the spatial distribution of CTAB micelles and regulate the pore size. The O/W volume ratio affects characteristics of the synthesized nano-materials by changing the morphology of the microemulsions [34,38,39]. Therefore, we have investigated the effect of the O/W volume ratio (range between 0.025 and 0.045) on the size and morphology of DFNS particles in the water-1-pentanol microemulsion system.…”

Mesoporous Bioactive Glasses in Cancer Diagnosis and Therapy: Stimuli‐Responsive, Toxicity, Immunogenicity, and Clinical Translation

“…[24] Depending on the surfactant nature, for instance, the molecular weight, and hydrophilic-lipophilic balance (HLB), as well as the surfactant concentration, mesoporous architectures in highly ordered, partially ordered or even totally disordered manner could be obtained . [87] By way of example, F127 with molecular weight of 12 600 Da leads to MBGs with pore size twice larger than the ones in MBGs obtained through CTAB templating with much smaller molecular weight (364.4 Da). [88] Also, the concentration of these templates could also play a pivotal role in determining the textural properties of MBGs.…”