Synthesis of mesoporous silica helical fibers using a catanionic-neutral ternary surfactant in a highly dilute silica solution: biomimetic silicification.
Mesoporous silica helical fibers in many different shapes have been synthesized in a highly dilute silicate solution at pH approximately 2.0 by using CnTMAB-SDS-P123 (n = 14-18) ternary surfactant as a template. The mesoporous silica helical fibers possess a well-ordered hexagonal mesostructure, high surface area, and large pore volume. Thus, the microtome sections of the helical fibers demonstrate a concentric mesotructure or two hemiconcentric mesostructures. In addition to triblock copolymer, adding the proper amount of 1-butanol or pentanol can promote the yield of the helical fibers as well. The yield of the surfactant-templated helical fibers is also dependent on the water content, reaction temperature, and pH value of the solution. The mesoporous silica helical fiber can be used as a solid template to prepare mesoporous carbon helical fibers via impregnation of phenol-formaldehyde, pyrolysis, and silica removal.
Lin
Giung-Ling
GL
Department of Chemistry, National Cheng Kung University, Tainan, Taiwan.
Tsai
Yi-Hua
YH
Lin
Hong-Ping
HP
Tang
Chih-Yuan
CY
Lin
Ching-Yen
CY
D020001:1-Butanol / Q000737:chemistry; D000838:Anions; D032701:Biomimetics; D002412:Cations; D002627:Chemistry, Physical / Q000379:methods*; D005557:Formaldehyde / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D019800:Phenol / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
D000838:Anions; D002412:Cations; D013501:Surface-Active Agents; D005557:Formaldehyde; D019800:Phenol; D012822:Silicon Dioxide; D020001:1-Butanol