Hits:

Indexed by:期刊论文

Date of Publication:2012-11-01

Journal:SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:97

Page Number:616-624

ISSN No.:1386-1425

Key Words:Siliceous mesoporous molecular sieve; Cooperative formation mechanism; Raman spectroscopy; EDTANa(4)

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+(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.