期刊
LANGMUIR
卷 25, 期 10, 页码 5484-5490出版社
AMER CHEMICAL SOC
DOI: 10.1021/la803336g
关键词
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资金
- Natural Scientific Foundation of China [20773081, 20333080, 20332040, 20472091, 50473048, 2472092, 20403025, 20672122]
- Education Ministry [106100]
- National Basic Research Program [2004CB719903, 2006CB806105, 2007CB936001, 2007CB808004]
- Bureau for Basic Research of CAS
The phase behavior of the ternary system consisting of an ionic liquid (1-tetradecyl-3-methylimidazolium bromide [C(14)mim]Br), p-xylene, and water were investigated. Depending on the composition of the ternary system, formation of hexagonal and lamellar liquid crystals as well as microemulsions was observed. H-1 NMR spectroscopy study, 2D ROESY spectroscopic analysis, and rheological measurements of the microemulsions indicated that p-xylene is preferably located in the hydrophobic core and the palisade shells of the microemulsions. The sizes of the microemulsion droplets for the samples with water/[C(14)mim]Br ratio of 78:22 are measured by both dynamic light scattering (DLS) and transmission electron microscopy with the freeze-fracture technique (FF-TEM). Upon change of the mole ratio of the solubilized xylene to [C(14)mim]Br from 0 to 2.4, the diameters of the microemulsion droplets increase from ca. 20 to 90 nm and size distribution gets broad, These microemulsions can solubilize and preorientate anthracene derivatives with a polar 9-substituent, and thus may enhance the head-to-head cyclomers in the photocyclization of these substrates.
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