Abstract
A detailed study on the preparation of highly ordered MCM-41 molecular sieves based on our new “delayed neutralization” process is presented. The rate of acidification does not have an apparent effect on the XRD patterns of MCM-41 but affects the morphology. The synthesized products give a thicker constant wall thickness (about 1.70 nm) of mesopore and a sharp pore size distribution. However, the structural order depends on the carbon chain length, the amount of alcohols as cosurfactants, and the synthetic temperature. A tubular morphology of the MCM-41 material, with hollow tubules 0.3 to 3 μm in diameter, can be obtained by careful control of the surfactant–water content and the rate of condensation of silica under high-alkalinity conditions. In tubules-within-a-tubule, the wall of the tubule consists of coaxial cylindrical pores of nanometers characteristic of MCM-41. The hierarchical order structure takes place through a “liquid crystal phase transformation” mechanism in which an anisotropic membrane-to-tubule phase change is involved.
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Lin, HP., Mou, CY. Studies on Mesoporous Self-Organizing Aluminosilica. Journal of Cluster Science 10, 271–293 (1999). https://doi.org/10.1023/A:1021925629248
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DOI: https://doi.org/10.1023/A:1021925629248