A calorimetric study of the gel-to-liquid crystal transition in catanionic surfactant vesicles
(2002) In Thermochimica Acta 394(1-2). p.31-37- Abstract
- Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised... (More)
- Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised in terms of headgroup electrostatic interactions which may have influence on the chain packing and phase transition temperature. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/325114
- author
- Marques, Eduardo LU ; Khan, Ali LU and Lindman, Björn LU
- organization
- publishing date
- 2002
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- liquid, gel phase, phase transition, catanionic surfactant, vesicle, electric double-layer forces, crystalline phase
- in
- Thermochimica Acta
- volume
- 394
- issue
- 1-2
- pages
- 31 - 37
- publisher
- Elsevier
- external identifiers
-
- wos:000178635200007
- scopus:0037137018
- ISSN
- 0040-6031
- DOI
- 10.1016/S0040-6031(02)00235-6
- language
- English
- LU publication?
- yes
- id
- 1ecc9521-d469-4c9a-a42c-c1101f351f78 (old id 325114)
- date added to LUP
- 2016-04-01 15:25:14
- date last changed
- 2022-01-28 05:16:09
@article{1ecc9521-d469-4c9a-a42c-c1101f351f78, abstract = {{Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised in terms of headgroup electrostatic interactions which may have influence on the chain packing and phase transition temperature.}}, author = {{Marques, Eduardo and Khan, Ali and Lindman, Björn}}, issn = {{0040-6031}}, keywords = {{liquid; gel phase; phase transition; catanionic surfactant; vesicle; electric double-layer forces; crystalline phase}}, language = {{eng}}, number = {{1-2}}, pages = {{31--37}}, publisher = {{Elsevier}}, series = {{Thermochimica Acta}}, title = {{A calorimetric study of the gel-to-liquid crystal transition in catanionic surfactant vesicles}}, url = {{http://dx.doi.org/10.1016/S0040-6031(02)00235-6}}, doi = {{10.1016/S0040-6031(02)00235-6}}, volume = {{394}}, year = {{2002}}, }