Existence and Stability of New Nanoreactors: Highly Swollen Hexagonal Liquid Crystals
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- 作者：Eduardo Pena dos Santos ; Miriam Sanae Tokumoto ; Geetarani Surendran ; Hynd Remita ; Claudie Bourgaux ; Philippe Dieudonné ; Eric Prouzet ; and Laurence Ramos
- 刊名：Langmuir
- 出版年：2005
- 出版时间：May 10, 2005
- 年：2005
- 卷：21
- 期：10
- 页码：4362 - 4369
- 全文大小：298K
- 年卷期：v.21,no.10(May 10, 2005)
- ISSN：1520-5827
文摘
We report the preparation of direct hexagonal liquid crystals, constituted of oil-swollen cylinders arrangedon a triangular lattice in water. The volume ratio of oil over water, 
, can be as large as 3.8. From the latticeparameter measured by small-angle X-ray scattering, we show that all the oil is indeed incorporated intothe cylinders, thus allowing the diameter of the cylinders to be controlled over one decade range, providedthat the ionic strength of the aqueous medium and are varied concomitantly. These hexagonal swollenliquid crystals (SLCs) have been first reported with sodium dodecyl sulfate as anionic surfactant, cyclohexaneas solvent, 1-pentanol as co-surfactant, and sodium chloride as salt (Ramos, L.; Fabre, P. Langmuir 1997,13, 13). The stability of these liquid crystals is investigated when the pH of the aqueous medium or thechemical nature of the components (salt and surfactant) is changed. We demonstrate that the range ofstability is quite extended, rendering swollen hexagonal phases potentially useful for the fabrication ofnanomaterials. As illustrations, we finally show that gelation of inorganic particles in the continuousaqueous medium of a SLC and polymerization within the oil-swollen cylinders of a SLC can be conductedwithout disrupting the hexagonal order of the system.
, can be as large as 3.8. From the latticeparameter measured by small-angle X-ray scattering, we show that all the oil is indeed incorporated intothe cylinders, thus allowing the diameter of the cylinders to be controlled over one decade range, providedthat the ionic strength of the aqueous medium and are varied concomitantly. These hexagonal swollenliquid crystals (SLCs) have been first reported with sodium dodecyl sulfate as anionic surfactant, cyclohexaneas solvent, 1-pentanol as co-surfactant, and sodium chloride as salt (Ramos, L.; Fabre, P. Langmuir 1997,13, 13). The stability of these liquid crystals is investigated when the pH of the aqueous medium or thechemical nature of the components (salt and surfactant) is changed. We demonstrate that the range ofstability is quite extended, rendering swollen hexagonal phases potentially useful for the fabrication ofnanomaterials. As illustrations, we finally show that gelation of inorganic particles in the continuousaqueous medium of a SLC and polymerization within the oil-swollen cylinders of a SLC can be conductedwithout disrupting the hexagonal order of the system.