Costructure-directing agent

Hierarchical silica nanotubes with radially oriented mesoporous channels perpendicular to central axis of tube Asymmetric No Costructure-directing agent used along with silica precursor. Chiral surfactant necessary. Modifying synthesis gel composition changes average inner diameter diameter of wall remains constant at 4nm. [13]... 

Further works in the field of nanostructured silica starting from SDA-CSDA ion pairs concern the formation of materials containing tethered anions. The formation of this type of material involves inverse ion pairs with respect to the synthesis of AMS mesophases, that is, anionic costructure-directing agent and cationic surfactant [78,106,107],... 

The use of ionic precursors in template-directed hydrolysis-polycondensation reactions clearly indicated a strong contribution of the precursor toward the formation of structured mesophases, based on ionic precursor-surfactant interactions. The work of Che and coworkers beautifully illustrates that templating methods involving surfactant-precursor ion pairs allow accessing highly structured siuface-functionalized silica materials. However, this work exclusively focused on the use of monosilylated costructure-directing agents and the formation of siuface-fimctionalized mesoporous silica phases. 

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