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论文类型：期刊论文

发表时间：2012-11-01

发表刊物：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：97

页面范围：616-624

ISSN号：1386-1425

关键字：Siliceous mesoporous molecular sieve; Cooperative formation mechanism; Raman spectroscopy; EDTANa(4)

摘要：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+(CH3)(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. (C) 2012 Elsevier B.V. All rights reserved.