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.
Highlights
In the past two decades, ordered mesoporous silica materials (MSM) have received much attention due to their tunable mesostructure, systematically tailored pore architecture, and their applications in adsorption, separation, catalysis, drug delivery, photonic, and nanosized semiconductors [1,2,3,4,5,6,7,8]
The preparation of MSM is based on the use of structure-directing agents, which are normally organic molecules or supramolecules of surfactants and polymers, for example, EO20PO70EO20 (Pluronic P123) for SBA15 type MSM [9, 10], Pluronic F127 for SBA-16 type MSM [11], cetyltrimethylammonium bromide (C16H33N(CH3)3Br, CTAB) for MCM-41 [3,4,5, 12] and MCM-48 [13, 14] types MSM, and biodegradable polyethylene oxide (PEO) surfactants for MSU-X type MSM [15,16,17,18]
We focus on the effect of the addition of straight-chain alkanes in the syntheses processes of ordered MSM on their textural characteristics and specific morphology
Summary
In the past two decades, ordered MSM have received much attention due to their tunable mesostructure, systematically tailored pore architecture, and their applications in adsorption, separation, catalysis, drug delivery, photonic, and nanosized semiconductors [1,2,3,4,5,6,7,8]. The pore expanding agents typically result in a decrease in mesostructure ordering and even a dramatic change in the type of mesostructure (e.g., from hexagonally ordered SBA15 to mesocellular foam) while they readily increase the pore size and volume of micelle-templated materials [28] In some cases, those swelling agents can remarkably change the particle morphology of obtained ordered MSM. While those micelle expanders, which show the excessively strong and poorly controlled swelling behavior, were used, it is hardly to enlarge the pore size without any changes in morphology, ordering, and type of mesostructure In this minireview paper, we focus on the effect of the addition of straight-chain alkanes in the syntheses processes of ordered MSM on their textural characteristics and specific morphology. The applications of these mesoporous silica materials prepared with the assistance of straight-chain alkanes in the fields such as catalysis, separation, and drug delivery are presented
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