The Lyotropic Mesophases in Dilute Surfactant Mixtures of Tetradecyldimethylaminoxide, Tetradecyltrimethylammonium Bromide, and Hexanol: The Influence of Ionic Charge on the Mesophases

Hoffmann, H.; Munkert, U.; Thunig, C.; Valiente, Mercedes

doi:10.1006/jcis.1994.1097

Cited by 97 publications

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“…The addition of NaCl can induce phase separation, resulting in an opaque appearance at room temperature; a similar change has also been observed in surfactant systems. 5 Though the appearance of the solution was used as a subjective determinant of MLV formation, 23,24,26 DLS intensityweighted histograms have indicated the presence of a multimodal distribution with large particles (>100 nm).…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Phospholipid Unilamellar Vesicles from Spontaneous Vesiculation: A DLS and SANS Study

et al. 2004

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=e39a317b-2207-400d-8a85-80f321547316 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=e39a317b-2207-400d-8a85-80f321547316 Standards and Technology, Gaithersburg, Maryland 20899 ReceiVed: June 9, 2004; In Final Form: September 8, 2004 Spontaneously formed unilamellar vesicles (ULV) composed of short-and long-chain phospholipids, dihexanoyl phosphorylcholine (DHPC) and dimyristoyl phosphorylcholine (DMPC), respectively, were doped with a negatively charged lipid, dimyristoyl phosphorylglycerol (DMPG), and studied with small-angle neutron scattering (SANS) and dynamic light scattering (DLS). Upon dilution, the spontaneous formation of vesicles was found to take place from bilayered micelles, or so-called "bicelles". SANS and DLS data show that ULV with narrow size distributions are highly stable at low lipid (C lp < 0.50 wt %) and NaCl salt (C s ) concentrations. ULV size was found to be independent of both C lp and C s when they were below 0.33 and 0.5 wt %, respectively. Surface charge and salinity were found to be important factors in preparing ULV of a certain size. This observation is not in complete agreement with previous experimental results and cannot be completely explained with current theoretical predictions based on equilibrium calculations for catanionic surfactant mixtures. ULV size is found to be invariant over a wide range of temperatures, both below and above the phase-transition temperature, T M , of DMPC, and was stable for periods of weeks and months, even after sonication.

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Section: Resultsmentioning

confidence: 99%

Highly Stable Phospholipid Unilamellar Vesicles from Spontaneous Vesiculation: A DLS and SANS Study

et al. 2004

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“…Dodecyldimethylaminoxide and n-hexanol in water, for example, form lamellar phases with 1 wt% total concentration (16); with tetradecyldimethylaminoxide, similar phases were found (17,18). This phenomenon of increasing tendency toward swelling of lamellar phases with decreasing charge density is counterintuitive.…”

Section: Phase Diagram and Ff-tem Investigationmentioning

confidence: 85%

Sodium and Calcium Laurylamidomethylsulfate: Aqueous Micellar Phases, Their Properties, and a Precipitate of Vesicles

Gräbner

Matsuo

Hoinkis

et al. 2001

Journal of Colloid and Interface Science

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“…In previous papers, the influence of ionic charges on the phase behavior of the zwitterionic surfactant TDMAO with alcohols as cosurfactant has been reported (7)(8)(9). In many investigations the surfactant charge was shielded by the addition of salt.…”

Section: Introductionmentioning

confidence: 97%

Phase Behavior, Structure, and Physical Properties of the Quaternary System Tetradecyldimethylamine Oxide, HCl, 1-Hexanol, and Water

Beck

Gradzielski

Horbaschek

et al. 2000

Journal of Colloid and Interface Science

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The Lyotropic Mesophases in Dilute Surfactant Mixtures of Tetradecyldimethylaminoxide, Tetradecyltrimethylammonium Bromide, and Hexanol: The Influence of Ionic Charge on the Mesophases

Cited by 97 publications

References 0 publications

Highly Stable Phospholipid Unilamellar Vesicles from Spontaneous Vesiculation: A DLS and SANS Study

Highly Stable Phospholipid Unilamellar Vesicles from Spontaneous Vesiculation: A DLS and SANS Study

Sodium and Calcium Laurylamidomethylsulfate: Aqueous Micellar Phases, Their Properties, and a Precipitate of Vesicles

Phase Behavior, Structure, and Physical Properties of the Quaternary System Tetradecyldimethylamine Oxide, HCl, 1-Hexanol, and Water

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