Novel Mesoporous Silica Materials with Hierarchically Ordered Nanochannel: Synthesis with the Assistance of Straight-Chain Alkanes and Application

Abstract

The straight-chain alkane-assisted synthesis of hierarchical mesoporous silica materials (MSM) results in variable mesostructures and morphologies due to remarkably different self-assembly routes of template agent from those without the assistance of straight-chain alkanes. The textural properties, particularly pore size, channel structure, morphology, and hierarchical structure of those MSM make them demonstrate peculiar effects in the immobilization of homogeneous catalysts.

Effect of a Swelling Agent on the Performance of Ni/Porous Silica Catalyst for CH4–CO2 Reforming

“…34 As a result, hierarchical porous silica materials have been applied in various heterogeneous catalytic applications, such as catalytic dibenzothiophene hydrodesulfurization, 16 selective hydrogenation of styrene and 3-hexyn-1-ol, 35 Fischer−Tropsch synthesis, 36 oxidative removal of 4,6-dimethyldibenzothiophene, 37 biodiesel synthesis, 38 etc. 39 In recent years, hierarchical porous materials have been employed as active catalyst supports in the CO 2 reforming of CH 4 to produce valuable syngas chemical feedstock. 40,41 In CO 2 reforming of CH 4 reaction, both reactants (CO 2 and CH 4 ) and the syngas product (H 2 /CO) are gases.…”

“…Such materials have the potential for enhanced properties compared with analogous single-mode porous materials. ,− The advantage of hierarchical porous materials in heterogeneous catalytic reactions is that micro/mesopores can offer active sites for reactants, whereas macropores can provide a flexible route for reactants accessing the active sites, resulting in high yields of the products. ,− In addition, the incorporation of hierarchical combinations of multiple-scale pores can enhance the surface area and pore volume of silica, which can enable functionalization of pore wall and strong interaction with various species . As a result, hierarchical porous silica materials have been applied in various heterogeneous catalytic applications, such as catalytic dibenzothiophene hydrodesulfurization, selective hydrogenation of styrene and 3-hexyn-1-ol, Fischer–Tropsch synthesis, oxidative removal of 4,6-dimethyl­dibenzothiophene, biodiesel synthesis, etc …”

Radioiodination of Modified Porous Silica Nanoparticles as a Potential Candidate of Iodine-131 Drugs Vehicle

“…These results confirm the observations of Zhang and Li that state that porous silica nanoparticles prepared with the assistance of straight-chain alkanes, i.e., n -hexane, are characterized by enlarged pore diameter. 52 …”

“…Thus, it was presumed that the radiolabeling results in PSN- 131 I have potential as a radiopharmaceutical or theranostic agent. According to IAEA 2018, 52 the activity of 131 I for radiotherapy can reach 2.22 GBq (approximately 60 mCi) for one fraction and 4. 44 GBq for three fractions.…”

“…The effect of time on the in vitro stability of the PSN preparation was studied to determine an appropriate time range in radiopharmaceutical preparation and to meet the criteria for quality control of radiopharmaceutical preparations as required by the IAEA. 52 Figure 12 shows a stability test for the formulation of PSN- 131 I, which results from the radioiodination of PSN and PSN-NH 2 . Data presented in Figure 12 a show that the preparation of PSN- 131 I with 12 mCi radioactivity was stable for up to 8 days in 0.05 M phosphate-buffered saline (PBS) solution, pH = 7.4.…”