2d-rectangular C2mm Mesoporous Silica Nanoparticles With Tunable Elliptical Channels And Lattice Dimensions

摘要

Mesoporous silica nanoparticles with a two-dimensional center-rectangular (plane group c2mm) lattice and coiled elliptical channels have been synthesized; the new synthetic route also allows simple control over the lattice dimensions and the elliptical shape of the channels.rnMost surfactant-templated mesoporous materials display pore topologies closely related to those for the liquid-crystal-like phases typical of surfactant-water systems. Among them, the materials (for example, SBA-8) with a two-dimensional (2D) centered-rectangular (plane group c2mm) lattice, correlated to the ribbon-intermediate phases, may be regarded as deformed structures of the hexagonal mesophase in which the cylindrical micelles are flattened. The elliptical channels resulting from the structural deformation are of special interest because of the additional anisotropy of the channels, but it remains a challenge to discover new synthetic strategies to control and extend the degree of the structural deformation. Here we report the synthesis of c2mm mesoporous silica nanoparticles with tunable lattice dimensions and tunable elliptical channel section. In addition, the elliptical channels are coiled, forming helical secondary mesostructure. The synthesis is envisioned to bring unprecedented opportunities to explore curvature-dependent chemistry of inclusion and surface functionalization in the anisotropic channel space.