A study of the microstructure of CTAB/1-butanol/octane/ water system by PGSE-NMR and Cryo-TEM |
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Authors: | Jian Xu Ganzuo Li Limin Zhai Qiang Shen Zhiqiang Zhang |
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Institution: | (1)Key Laboratory for Colloid and Interface Chemistry of State Education Ministry, Shandong University, Ji’nan 250100 ,China;(2)Department of Chemistry, Clarkson University, Potsdom, N.Y. 13699, USA |
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Abstract: | In this work, the effect of octane concentration on the phase behavior of CTAB/water/1-butanol system was studied by using pulsed field gradient spin-echo NMR measurements and freeze fracture electron microscopy (Cryo- TEM and FFEM). When the octane concentration increases, the liquid crystalline phase is destabilized and a continuous single-phase microemulsion region from the water apex to the oil apex is formed. The conductivity behavior has a distinct percolative phenomenon, which indicates that the single-phase microemulsion is changed continuously from oil- in-water (o/w) structure via a bicontinuous structure to water-in-oil (w/o) structure. This result is consistent with those of the PGSE-NMR, Cryo-TEM, and FFEM. In the w/o region, the self-diffusion coefficient of water is relatively high ((1—6)×10-10 m·s-1) due to the higher solubility of water in the continuous phase consisting of octane (10% by weight) and 1-butanol. The penetration of a large amount of octane molecules between surfactant chains results in the much lower self-diffusion coefficient of octane. |
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Keywords: | cetyltrimethylammonium bromide microstructure Cryo-TEM PGSE-NMR FFEM |
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