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Issue 23, 2017
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A dual-templating strategy for the scale-up synthesis of dendritic mesoporous silica nanospheres

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Abstract

We have demonstrated a facile and green way to synthesize dendritic mesoporous silica nanoparticles (DMSNs) on an ultra-large scale (kg) with cetyltrimethylammonium bromide (CTAB) and an anionic surfactant as dual templates free of organic solvents. In contrast to its co-template role in tuning the packing parameter of the surfactant molecule organization, the anionic surfactant herein acts as a more strongly competitive counterion against the adsorption of negatively charged silicate oligomers (I) on the micelles. Based on the new understanding of the interaction between the cationic–anionic surfactant ionic pairs and the silicate oligomers, we proposed a dual template synergistically controlled micelle self-aggregated model to understand the formation mechanism of dendritic MSNs where the anionic surfactant stabilized micelles or micelle blocks are basic self-assembling building units for the formation of center-radial pore channel networks. By using one-pot in situ isomorphous substitution, the metal Ti atom can be easily incorporated into the silica frameworks of DMSNs, and the obtained Ti-DMSN catalyst shows a superior catalytic performance in the epoxidation of cyclohexene over the typical mesoporous Ti-MCM-41 silicas.

Graphical abstract: A dual-templating strategy for the scale-up synthesis of dendritic mesoporous silica nanospheres

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Article information


Submitted
14 Jul 2017
Accepted
25 Oct 2017
First published
30 Oct 2017

Green Chem., 2017,19, 5575-5581
Article type
Communication

A dual-templating strategy for the scale-up synthesis of dendritic mesoporous silica nanospheres

P. Liu, Y. Yu, B. Peng, S. Ma, T. Ning, B. Shan, T. Yang, Q. Xue, K. Zhang and P. Wu, Green Chem., 2017, 19, 5575
DOI: 10.1039/C7GC02139A

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