Stable vesicles made from new triple-chain amphiphiles: long-term stability toward leakage of the trapped substances

Sumida, Yasushi; Masuyama, Araki; Maekawa, Hiroshi; Takasu, Mayuko; Kida, Toshiyuki; Nakatsuji, Yohji; Ikeda, Isao; Nojima, Màsatomo

doi:10.1039/a806903d

Cited by 16 publications

(21 citation statements)

References 7 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compound 52 was called a ªdouble-chain, double-head group surfactantº (an accurate but lengthy description of a gemini, making us glad we coined the euphemism) [1,2] that forms vesicles when sonicated in aqueous base. [75] Encapsulation is one of many potential applications of geminis that remain to be exploited. Stable vesicles, in which entrapped guests remain for months, can be made from triple-chained gemini 53.…”

Section: Vesicles Gels and Phase Behaviormentioning

confidence: 99%

Gemini Surfactants

Menger

Keiper

2000

Angew. Chem. Int. Ed.

1,288

953

View full text Add to dashboard Cite

How easy it is to dismiss the humdrum surfactant! After all, its structure is unglamorous by present‐day norms. And the surfactant has been entrenched in so many areas of commerce for so many decades that its chemistry might seem old and tired. The purpose of this review is to persuade the reader otherwise, all the while focusing on a remarkable new surfactant, the gemini. Geminis, the common name for “bis‐surfactants”, can self‐assemble at concentrations almost a hundredfold lower than for corresponding conventional surfactants. Surface activity can be improved a thousandfold. Geminis have already shown promise in skin care, antibacterial regimens, construction of high‐porosity materials, analytical separations, and solubilization processes. Scores of patents dealing with geminis have appeared in the last few years. Indeed, geminis might well turn out, in the opinion of some, to be more useful to “l'homme de la rue” than crown ethers or fullerenes. This review delves into such topics as synthesis, critical micellization concentration, aggregate size and shape, gels, vesicles, and films. The information comes from scientists all over the world; one might say that gemini research is bathed in a continuous sunlight or summer. No prior knowledge of colloid chemistry is presupposed in this article.

show abstract

Section: Vesicles Gels and Phase Behaviormentioning

confidence: 99%

Gemini Surfactants

Menger

Keiper

2000

Angew. Chem. Int. Ed.

1,288

953

View full text Add to dashboard Cite

show abstract

“…[74] Bei pH 9.2 haben die Vesikel hydrodynamische Durchmesser von etwa 360 . Das dreikettige Gemini-Tensid 53 [75] bildet stabile Vesikel, in denen eingeschlossene Gastmoleküle über Monate verbleiben. [75] Die Einkapselung ist eine der vielen möglichen, noch kaum genutzten Anwendungen von Gemini-Tensiden.…”

Section: Vesikel Gele Und Phasenverhaltenunclassified

Gemini-Tenside

Menger

Keiper

2000

Angewandte Chemie

View full text Add to dashboard Cite

“…Masuyama published a useful review of the preparation and surfactant properties featuring additional functions and high-performance (22). In addition to such double-chain surfactants, the preparation of triple-chain surfactants and their surface active properties have also been reported (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33). Very recently the surface activity of mixtures of partially-quaternized 2-vinylpyridine telomers and a cationic Gemini surfa 35 36 of solubilization by the mixed system of the same anionic Gemini surfactant and a soap (sodium dodecanoate) (37).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Micelle Formation of Mixed Surfactant Systems in Water II: A Combination of Cationic Gemini-type Surfactant with MEGA-10

et al. 2003

View full text Add to dashboard Cite

Mixed micellization and mixed adsorbed film formation were investigated for the combination of a Gemini type cationic and a nonionic surfactants mixture: Bis-trimethyl ammonium Gemini derived from tartaric acid bromide (BAGTB) and n-Decanoyl-Nmethylglucamide (MEGA-10). The surface tension of the aqueous mixed surfactant solution was measured at every 0.1 mole fraction of MEGA10 in the surfactant mixture applying a drop volume method at 30. From the curves of surface tension (g) vs logarithmic concentration in molality (ln m), critical micellization concentration (CMC), minimum surface tension at CMC (g CMC), surface excess (G), mean surface area occupied by a molecule (A m) and parameters related to synergism in surface activity such as pC 20 and CMC / C 20 were determined. Based on the regular solution theory, the relation of compositions of the singly dispersed phase (X MEGA10) and the micellar phase (Y MEGA10), and the relation of X MEGA10 with the composition in adsorbed film phase (Z 2) were estimated, and along with these, the interaction parameters in micelles (w R) and in adsorbed film (w A) were calculated. Both the CMC-X MEGA-10 and CMC-Y MEGA-10 curves showed a negative deviation from ideal mixing and even the curve of Z MEGA10-m t (bulk phase concentration) produced a slightly negative w A. However, the synergism in surface tension reduction was found to be rather weak from examination of partial molecular area (PMA) and the minimum free energy at surface G min (S) = (g CMC A m L). As for the adsorbed film, the interaction mode between molecules, as well as two dimensional molecular packing, was observed to be separated into three regions; i. e. at X STDS = 0.45 and at X STDS = 0.75 different properties changed discontinuously.

show abstract

Stable vesicles made from new triple-chain amphiphiles: long-term stability toward leakage of the trapped substances

Cited by 16 publications

References 7 publications

Gemini Surfactants

Gemini Surfactants

Gemini-Tenside

Adsorption and Micelle Formation of Mixed Surfactant Systems in Water II: A Combination of Cationic Gemini-type Surfactant with MEGA-10

Contact Info

Product

Resources

About