Effects of surfactant concentration on alkyl chain arrangements in dry and swollen organic montmorillonite
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Hu, Zhengwen
- 通讯作者：
- He, GH (reprint author), Dalian Univ Technol, R&D Ctr Membrane Sci & Technol, State key Lab Fine Chem, Dalian 116024, Peoples R China.
- 合写作者：
- He, Gaohong,Liu, Yuanfa,Dong, Chunxu,Wu, Xuemei,Zhao, Wei
- 发表时间：
- 2013-05-01
- 发表刊物：
- APPLIED CLAY SCIENCE
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 75-76
- 页面范围：
- 134-140
- ISSN号：
- 0169-1317
- 关键字：
- Montmorillonite; Organoclay; Solution intercalation; Swelling; Surfactant
- 摘要：
- 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.
- 是否译文：
- 否
