Structure modulation of periodic mesoporous organosilicas with organic salts

The design of the hierarchical structure and geometry of nanomaterials at the molecular and macroscopic level are crucial to determine their properties and applications. In this work, we describe a facile and effective method to control over the mesostructure and morphology of ethane-bridged PMOs wi...

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Bibliographic Details
Published in:Journal of materials science 2021-08, Vol.56 (24), p.13590-13603
Main Authors: Lin, Feng, Meng, Xiangyan, Tang, Ke, Wu, Lishun, Yuan, Ruting, Liao, Lijun
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Classical Mechanics
Control methods
Crystallography and Scattering Methods
Ethane
Ethylenediaminetetraacetic acid
Hydrophobicity
Materials Science
Mesophase
Micelles
Nanomaterials
Organic salts
Oxalates
Oxalic acid
Polymer Sciences
Silica
Silicon dioxide
Sodium
Sodium benzoate
Sodium salicylates
Solid Mechanics
Structural hierarchy
Surface active agents
Surfactants
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Summary:The design of the hierarchical structure and geometry of nanomaterials at the molecular and macroscopic level are crucial to determine their properties and applications. In this work, we describe a facile and effective method to control over the mesostructure and morphology of ethane-bridged PMOs with the assistance of various organic salts under basic conditions. It is demonstrated that the specific interaction between the surfactant and organic salts is responsible for the shape of surfactant micelles and the formation of ethane-bridged PMOs. Specifically, the structure and the hydrophobicity of the organic salts play a major role. The addition of organic salts with more hydrophobic organic moieties, such as sodium salicylate, sodium succinate and sodium benzoate, will increase the surfactant packing parameter more effectively, leading to the mesophase change from cubic Pm3n to 2-D hexagonal P6mm structure, whereas the addition of organic salts with lower hydrophobicity and larger polar head, like sodium oxalate, will result in the mesophase transformation from cubic Pm3n to 3-D hexagonal P6 3 /mmc structure. Moreover, the addition of organic salts will not only affect the micellar formation, but also influence the charge matching at the surfactant/silicate interface as well as the condensation and aggregation kinetics of silica species. The addition of large amount of any organic salts will eventually lead to the formation of PMOs with disordered mesoporous structure. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06191-8