title: Short-range interactions between surfactants, silica species and EDTA⁴- salt during self-assembly of siliceous mesoporous molecular sieve: a UV Raman study.
abstract: The effects of surfactants, counterions and additive salts on the formation of siliceous mesoporous molecular sieves during self-assembly process were investigated by UV Raman spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The surfactant molecules experience the rearrangement after adding the silica species and adjusting the pH value. The obvious change of the Raman bands related to the surfactants supports a cooperative interaction between surfactant and inorganic species during self-assembly process. The addition of EDTANa(4) to the system induces the interaction between the COO(-) groups of EDTA(4-) and silanol groups of silica and a strong interaction between the EDTA(4-) and the N(+)(CH(3))(3) groups of the surfactant. The above interactions may be the main reason for the salt effect. The new information from the change of the chemical bonds allows for a further analysis to the interactions of different salts between surfactants and silica species at molecular level.
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China.
authors.forename: Jiayin
authors.initials: J
authors.lastname: Song
authors.forename: Liping
authors.initials: L
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Guang
authors.initials: G
authors.lastname: Xiong
mesh_terms: D000838:Anions; D008725:Bis-Trimethylammonium Compounds / Q000737:chemistry; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D016062:Porosity; D011208:Powders; D012492:Salts / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013501:Surface-Active Agents / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D008725:Bis-Trimethylammonium Compounds; D002593:Cetrimonium Compounds; D011208:Powders; D012492:Salts; D013501:Surface-Active Agents; C525618:cethyltrimethylammonium chloride; D012822:Silicon Dioxide; D004492:Edetic Acid; D000077286:Cetrimonium