Indexed by:
期刊论文
First Author:
Hu, Zhengwen
Correspondence Author:
He, GH (reprint author), Dalian Univ Technol, R&D Ctr Membrane Sci & Technol, State key Lab Fine Chem, Dalian 116024, Peoples R China.
Co-author:
He, Gaohong,Liu, Yuanfa,Dong, Chunxu,Wu, Xuemei,Zhao, Wei
Date of Publication:
2013-05-01
Journal:
APPLIED CLAY SCIENCE
Included Journals:
SCIE、EI
Document Type:
J
Volume:
75-76
Page Number:
134-140
ISSN No.:
0169-1317
Key Words:
Montmorillonite; Organoclay; Solution intercalation; Swelling;
Surfactant
Abstract:
To investigate the effects of surfactant concentration on alkyl chain arrangements in dry and swollen organic montmorillonite (OMt), Na+-montmorillonite (Na+-Mt) was modified with cationic surfactants with different alkyl chain lengths, including tetradecyl-trimethylammonium bromide (TTAB), cetyltrimethylammonium bromide (CTAB) and steartrimonium bromide (STAB), at a series of concentrations. The properties of dry and swollen OMt were characterized by thermal analysis and X-ray diffraction. Two kinds of novel arrangement of alkyl chains were found for dry CTAB-Mt The surfactant polar head showed two arrangements when the CTAB concentration increased from 0.23 to 0.45 cation exchange capacity (CEC). The arrangement of the paraffin-type bilayer had a larger tilting angle at 1.93 CEC than that of reported research, leading to a maximum d-spacing of 5.81 nm. For swollen CTAB-Mt in the solvent, the d-spacing first increased and then remained constant with increase in the amount of added CTAB. The swelling behavior was proposed, including three distinct stages: solvent-controlling stage, surfactant concentration-controlling stage, and alkyl chain length-controlling stage. The alkyl chain arrangements of dry and swollen OMt were further confirmed by TTAB-Mt and STAB-Mt (C) 2013 Elsevier B.V. All rights reserved.
Translation or Not:
no
