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Self-assembly in a ...
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Brito, Rodrigo O.
(författare)
Self-assembly in a catanionic mixture with an aminoacid-derived surfactant: From mixed micelles to spontaneous vesicles
- Artikel/kapitelEngelska2006
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2006-08-24
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American Chemical Society (ACS),2006
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LIBRIS-ID:oai:lup.lub.lu.se:088e1c5e-1f2c-477a-9084-c3ee9a8cd49d
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https://lup.lub.lu.se/record/393008URI
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https://doi.org/10.1021/jp061946jDOI
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Språk:engelska
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Sammanfattning på:engelska
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The aqueous self-assembly of a novel lysine-derived surfactant with a gemini-like architecture, designated here as 12-Lys-12, has been experimentally investigated for the amphiphile alone in water and in a mixture with dodecyltrimethylammonium bromide (DTAB). The neat surfactant forms interesting micrometer-sized rigid tubules in the dilute region, resulting in very viscous solutions. For the catanionic mixture with DTAB, various single and multiphase regions were identified (up to a total surfactant concentration of 1.5 wt %) by means of combined polarizing light microscopy, cryo-TEM, and NMR. In the DTAB-rich side, for a mixing molar ratio in the range 2 < DTAB/12-Lys-12 < 4, a region of stable, unilamellar vesicles can be found. Furthermore, it was found that upon addition of 12-Lys-12 to pure DTAB solutions, the mixed micelles grow and beyond a given mixing ratio, vesicles assemble and coexist with small micelles. The transition is not continuous, since there is a narrow mixing range where phase separation occurs. Self-diffusion measurements and cryo-TEM imaging show that the average vesicle radius is on the order of 30-40 nm.
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Marques, Eduardo F.
(författare)
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Gomes, Paula
(författare)
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Falcao, Soraia
(författare)
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Söderman, OlleLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fk1-oso
(författare)
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Fysikalisk kemiEnheten för fysikalisk och teoretisk kemi
(creator_code:org_t)
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Ingår i:The Journal of Physical Chemistry Part B: American Chemical Society (ACS)110:37, s. 18158-181651520-52071520-6106
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